Assessing the Cardiovascular System Assignment Example | Topics and Well Written Essays - 250 words

Assessing the Cardiovascular System - Assignment Example Losing weight might also aid in reducing medications required to regulate high blood pressure. If a person is overweight, then they should talk to their doctor concerning a healthy weight loss strategy (McArdle 45). The most appropriate manner of losing some kilos is through moving around more. This will help you burn more calories than you absorb through normal activity or exercise. Normal exercise, at least 30 minutes every day, can also aid lowering blood pressure, as well as strengthening someone’s heart. Maintaining a food diary or written record of a person’s daily food intake is the most appropriate way of knowing what to eat on a daily basis (Ross 108). Writing down the foods someone consumes, including the amount or size, can let you observe "the true facts" concerning someone’s food consumption (Lee and Nieman, 278). For a patient with an elevated blood pressure, he or she can start cutting back – decreasing portion sizes and calories -- to lose significant pounds and manage their weight, as well as blood

Compare Ode to a Nightingale and A Draught of Sunshine by John Keats Essay

Compare Ode to a Nightingale and A Draught of Sunshine by John Keats - Essay Example Much of his youth was stigmatized by poverty and poor health. He also got into an understanding with Frances â€Å"Fanny† Brawne but the relationship didn’t last long because of Keats’ failing health, although Fanny was loyal to Keats and tended him very near to his last days. It was during this period of his failing health when he wrote Lamia, Isabella, The Eve of St. Agnes, and Other Poems (1820) which included the poem â€Å"Ode To A Nightingale†. Ode To A Nightingale is a poem that was very close to Keats’ personal life. The poem was evocative of all the sufferings that Keats faced in his short-life like the death of his parents; the suffering and pain which he witnessed in people as a surgeon apprentice, the death of his brother and ultimately his own vain life spent in convalescing from the deadly disease of tuberculosis and the pangs of a relationship that couldn’t shape up. The poem speaks of the life of a nightingale in which the poet compares it with that of the life of a human being. Keats says in the poem that the life of a nightingale is blessed because it hasn’t seen the stressed life of humans which is impregnated with worries and sickness. He further says that the life of humans is so sad where beauty is not perpetual and affection is not consistent but the nightingale is above all this and its music is fluid and it is immortal. The writer wishes very hard to flee from the human world to the world of the nightingale. Keats also further wishes to succumb to death painlessly by delightfully listening to the melodious music of the nightingale. The nightingale’s song has been taken to be the ticket to the other world which is free of materialism and physicality. Keats achieved to flee to the world of the nightingale by alcohol and opium but later agreed that the sweet musical chants of the nightingale will help him transport to Utopia. â€Å"A Draught of Sunshine† is another of Keats’ poem which

Effect of Height on Velocity | Experiment

Effect of Height on Velocity | Experiment Extended Experimental Investigation MOTION ON AN INCLINE DUONG, Phong (Nathan) Contents 1.0 Introduction: 1.1 Research Question and Aim 1.2 Theory Review 1.2.1 Gravity 1.2.2 Forces 1.2.3 Ramp physics 1.2.4 Newtons law 1.3 Hypothesis 2.0 Methods 2.1 Safety 2.2 Equipment 2.3 Procedures 3.0 Results and Analysis 3.1 Results 3.1.1 The inclined angle of the ramp 3.1.2 3.2 Analysis 3.3 Error Analysis 4.0 Discussion 5.0 Conclusion 6.0 Appendices Appendix 1: Appendix 2: Appendix 3: Appendix 4: Appendix 5: 7.0 References 1.0 Introduction: 1.1 Research Question and Aim The aim of this extended experimental investigation is to find how gravitational energy and kinetic energy apply on the toy car rolling down the steep ramp. How does the ramp height affect the velocity of the car? 1.2 Theory Review Basically, when a ramp has a small angle of incline, the force of friction between the car and the ramp has greater potential to prevent the car from moving. When an object rests on a surface like the ramp, the ramp exerts a force called normal force on the object, and this force is greater when the angle of incline is smaller. The reason for this is that the force of gravity on the car has to be split between horizontal and vertical components. If the ramp is steep, the force of gravity can more easily overcome the force of friction. Obviously gravity will cause an object on an incline to move down the slope faster than a flat slope. 1.2.1 Gravity Gravity acts vertically downwards, and the body during its free fall is accelerated due to the force of gravity. A body moving upward is undergoing negative acceleration, or deceleration, as its speed decreases and it momentarily comes to rest at the highest point of its ascent where its velocity becomes zero due to retardation obtained by the opposing force of gravity. As the gravity increases the motion of an object during its free fall and decreases the motion of an object as it travels in an upward direction. 1.2.2 Forces All moving objects have a type of energy called kinetic energy (Ek) as well as the potential energy (PE) which stored in an object. These two forces have the potential to do work and gravity gives potential energy to object whereas kinetic energy of an object depends only upon its mass and its speed. The formula for potential energy due to gravity isPE=mgh. As the object gets closer to the ground, its potential energy decreases while its kinetic energy increases. The difference in potential energy is equal to the difference in kinetic energy. 1.2.3 Ramp physics A ramp works like this inclined plane, the steeper the ramp the larger the amount of the sliding force. , when the ramp is (vertically) only the sliding component is left and equals the weight force. On the other extreme (the ramp is horizontal) the sliding force vanishes and only the component of the normal force is left. 1.3 Hypothesis It is hypothesised that as the angle of the ramp increases the speed of the car travels will also increase which results in shorter time for the car to travel down the ramp. This is predicted according to the theory of gravitational potential energy converting to kinetic energy. 2.0 Methods 2.1 Safety Must handle the retort stand with care as it could cause injuries if it drops on the lower bodies (legs, knees, footsetc.) as well as the ramp because they are quite heavy. 2.2 Equipment Retort stand For the ramp to rest on, to increase the height of theramp summit to any height Ramp- for the toy car to roll down Stop watch- to time the toy car (starts and finishes) Note book- to record the results on Measurements tape-to measure out 1 metre on the ramp Chalk- To mark the starting points and finish lines 2.3 Procedures 1. Set out equipment as shown in the diagram. 2. Ensure the height at the start line (the summit of the ramp) is 30 cm using the metre stick. 3. Ensure there are no extra weights attached to thetoy car. 4. Hold the toy car with its front touching the start line. 5. Simultaneously start the stop clock and release the toy car (becareful not to push it or exert any extra force on it). 6. Stop the clock when the front of the toy car reaches the finish line. 7. Record the time taken for the toy car to reach the finish, next to the relevant height, in a table. 8. Repeat from step 4 four times so you end up with five results for the same height then continue onto step 9. 9. Add all these results together and divide the answer by five to obtain the average time. 10. Record this average in the table. 11. By placing more books underneath the raised end of the ramp, increase the height at the summit by 10cm. Use the metre stick to check 12. Repeat from step 4 until you have obtained results for height from 30cm through to 50cm 3.0 Results and Analysis 3.1 Results The average time for different heights and distance Ramp Length (cm) Heights of the ramp (cm) Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Average time (seconds) Speed (m/s) Acceleration (m/s) Velocity(m/s) 100 30 0.79 0.87 0.81 0.85 0.84 0.832 1.2 3 2.5 40 0.68 0.84 0.66 0.67 0.68 0.706 1.42 3.97 50 0.65 0.63 0.64 0.64 0.62 0.636 1.57 4.87 95 30 0.79 0.78 0.76 0.77 0.78 0.776 1.21 3.22 2.8 40 0.67 0.66 0.72 0.65 0.65 0.67 1.41 4.18 50 0.6 0.65 0.58 0.64 0.61 0.616 1.54 5.03 90 30 0.72 0.75 0.71 0.74 0.72 0.728 1.23 3.43 3.1 40 0.71 0.67 0.72 0.73 0.68 0.702 1.28 3.99 50 0.64 0.59 0.59 0.61 0.58 0.602 1.5 5.15 3.1.1 The inclined angle of the ramp Heights of the ramp (cm) Angle of inclination (degrees) 30 16.7 40 21.8 50 26.6 3.1.2 Figure 1 3.2 Analysis The results show that when the ramp is higher (50cm) the car went fasterdown the slope at (3.1m/s). This is because gravity is pulling the car straight down andfriction is pulling the car back up the ramp, opposite to direction ofmotion. The ramp is pushing the car straight up in the oppositedirection of gravity. The ramp is also pushing it horizontally awayfrom the ramp. The net force (the sum of the weight and normal force)acting on the car is large enough to make the car to accelerate downthe ramp. If the ramp were horizontal the net force would be zerotherefore the car would not move. So the higher an object goes the more gravitational potential energyit gains. When it falls, its potential energy is converted intokinetic energy and; since energy can neither be created or destroyed,only converted then it will move at a faster speed. 3.3 Error Analysis There are many gaps of errors when conducted this experiment such as careless error, random error, human error (reaction time) and systematic errors. These are due to mistakes in reading scales or careless setting markers; they can be eliminated by repetition of readings by one or two observers. Whereas the random error could be the observer’s position when recording the data and it could spread the results further away to the true value which will increase in anomalies. The results weren’t really accurate because air resistance and friction energy wasn’t taken in to the account, with these taken in to the calculation then it would be more accurate for the speed of the car. 4.0 Discussion The experiment worked well after the preliminary experiment, the experiment indicates that if the height of the ramp is too high it would not produce very goodresults. Assume the results were accurate and the methodworked. Due to human error and reaction time, these results could notbe relied on completely, but did give a rough idea of how the experiment would have worked. If the conduction of the experiment was to be done again, it would be more accurate by producingresults using the computer system with light gate. The air resistance was neglected because if the resistance to be present, the results would be decrease but not very much throughout the experiment. The car was suffering from the friction of a ramp, something that would seriously affect the car due to it having a small mass. There were certainly some places where the experiment was lacking in some accuracy and it could have improved. The first area to highlight is the car, where most of the accuracies were caused. The car certainly had friction occurring in the wheels of the car, and with the surface it was going down. This is one of the major problem to solve because a frictionless car is impossible, to encounter this problem is to find a better car with better bearings is the wheels and more therefore less friction, causing less wasted energy through sound and heat. There was also some accuracy lacking areas which couldn’t improve either without better equipment. If the conduction of the experiment were to happen again, experimenting withdifferent surfaces of ramp would be a changed. The main problem established in the experiment wasthat the toy car kept swaying to the side, creating a longer journeyand hitting the edge majority of the time. This also could have been caused dueto uneven flooring of the ramp. If the right equipment could be accessed to calculatingthe speed using light gates and determining if it produces theoreticallyperfect results, also eliminating any other opposingforces, such as friction, polishing surfaces etc. (no air resistance) and noticing ifthis changes the results.To take the potential/kinetic energy element even further,looking into elastic potential energy and identify if it works on the sameprinciple as gravitational potential energy. 5.0 Conclusion In conclusion, the experiment demonstrated that the ramp set on (50cm) height at the distance of (90cm) had a greater velocity (speed) and acceleration than other heights. This suggests that the car had a greater velocity and lowest time was because of the steepness of the ramp that was set on. The longer of the ramp, along with gravity had a huge impact on the car movement from the top of the ramp to the bottom. The hypothesis is supported by scientific theory of motion on an incline. 6.0 Appendices Appendix 1: 1 metre (100cm) long ramp Heights of the ramp (cm) Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 30cm 0.79 0.87 0.81 0.85 0.84 40cm 0.68 0.84 0.66 0.67 0.68 50cm 0.65 0.63 0.64 0.64 0.62 95 cm long ramp Heights of the ramp (cm) Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 30cm 0.79 0.78 0.76 0.77 0.78 40cm 0.67 0.66 0.72 0.65 0.65 50cm 0.6 0.65 0.58 0.64 0.61 90 cm long ramp Heights of the ramp (cm) Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 30cm 0.72 0.75 0.71 0.74 0.72 40cm 0.71 0.67 0.72 0.73 0.68 50cm 0.64 0.59 0.59 0.61 0.58 Appendix 2: Example 1: Given height = 30 cm and the length or the ramp = 100 cm Example 2: Given height = 40 cm and the length or the ramp = 100 cm Example 3: Given height = 50 cm and the length or the ramp = 100 cm Appendix 3: Velocity of (30 cm=0.3m) height ramp, g=9.8 m/s (constant) Velocity of (40 cm=0.4m) height ramp, g=9.8 m/s (constant) Velocity of (50 cm=0.5m) height ramp, g=9.8 m/s (constant) Appendix 4: Appendix 5: When the height at 30 (cm), velocity=2.5m/s 7.0 References Silverman, Buffy (2009).Simple Machines: Forces in Action, 4th Ed.. USA: Heinemann-Raintree Classroom. p.7.ISBN978-1-4329-2317-4 Reilly, Travis (November 24, 2011).Lesson 04:Slide Right on By Using an Inclined Plane.Teach Engineering. College of Engineering, Univ. of Colorado at Boulder. Retrieved September 8, 2012 Smith, Crosbie (1998).The Science of Energy a Cultural History of Energy Physics in Victorian Britain. The University of Chicago Press.ISBN0-226-76420-6. Feynman, Richard P. (2011).Work and potential energy.The Feynman Lectures on Physics, Vol. I. Basic Books. p.13.ISBN978-0-465-02493-3. Is Elasticity Coefficient Elastic Or Inelastic? Is Elasticity Coefficient Elastic Or Inelastic? Inelastic The price elasticity of demand for a downward sloping straight line demand curve varies as we move along the curve. If we look at the demand curve for Zesty Health Clubs, as we move down the upper segment of the demand curve, price elasticity of demand falls and total revenue rises. For example, measured over the price range of $1030 to $960, if price falls from $1030 to $960 the price elasticity of demand is 1.92 and therefore this segment of demand is elastic (Ed >1). Between these two price changes, total revenue increases from $9,936,000 to $11,088,000. This shows that a small reduction in price in the top part of the demand curve will bring about a larger proportionate increase in the quantity demanded for Zesty Health Clubs thereby increasing its revenue. Between the price range of $720 to $840, price elasticity is unitary elastic. (Ed = 1) and thereby total revenue is maximized. In the above relevant price level the elasticity coefficient is UNIT ELASTIC is exactly the same as the percentage in price everywhere along the demand curve. As we move down the lower segment of the demand curve price elasticity of demand falls below a value of 1.0 and total revenue declines. Over the price range of $480 to $600, for example, the price elasticity of demand is 0.47 respectively and therefore this segment of demand is inelastic (Ed < 1). Between these prices, total revenue declines from $10,800,000 to $9,600,000. This shows that a reduction in price in the bottom part of the demand curve will bring about a small proportionate change in quantity demanded for Zesty Health Clubs, thereby decreasing its revenue. In conclusion on a straight line demand curve the price elasticity of demand is different at every point along the curve (c) Four factors affecting the price elasticity of demand for gym memberships at Zesty Health Clubs; Availability of substitutes The most important determinant of price elasticity of demand is the availability of substitutes. Demand is more elastic for a good or service with close substitutes. If we look at Zesty Health Clubs, the alternatives or substitutes that consumers can switch to is relatively low. Of course there are few alternatives they could consider such as considering buying used gym equipment, renting exercise tapes, or even outdoor exercising such as swimming, cycling, running etc. Many consumers would prefer getting a membership simply just to avoid the trouble of physical stress in order to buy this stuff and also would prefer a better reliable health club when coming to health issues. Therefore the demand for Zesty health clubs is more inelastic in which the percentage change in quantity demanded is smaller than the percentage change in price, leading to an increase in total revenue. It is also experienced that a high price charged has made the demand to be ore elastic for Zesty health clubs. A price of $1,080 has made a condition in which the percentage change in quantity demanded is greater than the percentage change is price. This may be due to the fact that considering the current recession, peoples disposable income is relatively low as a result consumers have no other choice than switching to the close substitutes such as personal health training, outdoor physical activities etc. Short run and long run effect Most goods or services tend to be inelastic in the short run and elastic in the long run. If we take the case of Zesty health clubs we can assume that even if they uplift there price by small margin customers will still want to continue or even obtain memberships since nowadays people are more health conscious. They may be loyal to the service provided by Zesty Health clubs and may not consider shifting to the alternatives available. But in the long run consumers may be more price conscious and tend to shift to its substitutes not necessary been price as the main factor but also due to new competitors entering the market, state of the art gym products available that could be used at home at ease, or even health tip news available daily that is sent to a customers mobile phone provided by the network provider for a small charge. These different ranges of choices available make consumers demand shift from inelastic in the short run to elastic in the long run. Share of budget spent on the product Customers may devote only a certain amount rather a less proportion of income spent on membership fees. For e.g. if we consider a price change in sugar which is an convenience product consumers may pay little attention, likewise since people are more health conscious these days a change in price of membership fees may not be felt largely by consumers. However, high membership prices such as $1080 may force price conscious customers to switch to the alternate substitutes. Even circumstances apply where price is not the main factor, customer may prefer home training, or other physical activities which reduce the quantity demanded for Zesty Health Clubs. Necessity or Luxury These days consumers are more concerned about their health, therefore the demand for Zesty health clubs remain inelastic. Consumers understand that they need to be fit in order to maintain good health. As a result if Zesty health clubs peruse to increase prices the burden may not be felt heavily on consumers, as a result the elasticity coefficient remains inelastic in which the percentage change in quantity demanded is smaller than the percentage change in price. (Ed < 1). However if Zesty health clubs have really high membership fees this may force the members to switch to alternatives as I discussed above such as personal health training, outdoor physical activities etc. Consumers may not have any other choice but to switch to other alternatives to suit their needs. Assuming that the price per gym membership is $840, Zesty Health Club will be able to generate total profit of $9,323,200. If Zesty health club decides to reduce its membership price from $840 to $720, they would be able to obtain a profit of $8,622,300. If, in case they pursue to go ahead with their business decision they would experience a 7.5% loss on the total profit. Another aspect that should be considered is that fact that at the price of $840 Zesty health clubs are facing with a total cost of $2,168,000, whereas if Zesty health clubs per sue to lower their price from $840 $720, total cost increases to $2,876,100 which is an increase of approximately 33%, which is quite a huge sum. Looking at this business decision in a financial perspective it seems to that the decision is not profitable. This business decision should not be solely made on financial aspects other relating aspects should be considered as well. If we examine the table, we could identify that elasticity changes from been unit elastic to inelastic. Zesty health clubs may wish to remain been unit elastic because price elasticity is unitary elastic. (Ed = 1) and thereby total revenue is maximized. This is a situation where Percentage change in quantity demanded is equal to the percentage change in price. Therefore, it will be advantages for Zesty health clubs to remain at price $840 since elasticity is unit elastic. However if Zesty health clubs go ahead with their business decision that is reduce the price from $840 to $720 they will be to attract 2290 more customers that is an increase of 16.7%, which makes then obtain a higher market share, however even if Zesty health clubs loses 2290 customers, they still have been able to maximize profits by large charging $840. Therefore the burden is well set off by the maximizing profits. Looking at the above evaluation of Zesty health clubs business decision, I would recommend them NOT to go ahead with the business decision as it is financially non-profitable and since they would want to remain being unit elastic rather than inelastic as total revenue is maximized been unit elastic. Looking at the above graph, we could see that at price $860 Zesty health clubs gets revenue of $11,491,200 which contributes to the highest profit of $9,323,200. At this price level profits are maximized bringing the highest profit level to them, therefore according to these statistics Zesty health clubs should charge its customers at this price since it is getting the highest benefit. Income elasticity of demand is the ratio of the percentage change in the quantity demanded of a good or service to the percentage change in income that has bought about this change in quantity demanded, (Economics for today, Allan Layton et al, 2nd edition, 2005). In this context it is the change in quantity demanded in memberships for Zesty health clubs to the change in income due to economic downturn which reduced average income. Percentage change in income EY is income elasticity of demand, Q1 and Q2 represent quantities demanded before and after the income change, and Y1 and Y2 represent income before and after the income change. (Economics for today, Allan Layton et al, 2nd edition, 2005). NORMAL SERVICE From the arrived answer we can assume that Zesty health club memberships is a normal service because the income elasticity of demand is positive Ey>0, the demand and income move in the same direction. Thus, the variables change in the numerator and denominator move in the same direction. Income elasticity of demand is necessary to calculate because during a downturn when the consumers income falls, if the membership is a normal good then the no. of memberships falls. As a result income elasticity of demand helps us to identify whether the impact brings a favorable change of a negative change and also help us identify whether Zesty health clubs membership is a normal service or an inferior service. If we look at the relationship between average income of Australians and gym memberships we could see that there is a direct relationship. If assuming the current economic downturn is not experienced, the average income of Australians would have been stable and also disposable income may be high. This gives the chance for Zesty health clubs to increase memberships or even quantity demanded because since consumers are nowadays more concerned with their health and with high disposable income they may decide to obtain a membership. Now assuming that the Australians are facing with a current economic downturn, which leaves peoples disposable income low, we could see that due to a reduction in average income from $65000 to $55000 p.a. is has resulted in a reduction in memberships form 11,500 to 10, 600. As a result it is clearly identifiable that there is a direct relationship between income and memberships. SECTION B Article 1: Chile strike sends copper prices soaring SUMMARY The price of copper rose to 7500 US dollars per ton, the highest since August 2008, on trading on the London Metal Exchange. The major cause was attributed to industrial action in the form of strikes in Chiles two largest copper mines. The miners wanted higher pay and better benefits. Many of them failed to show up and prices rose further after the likelihood of a strike increased fears that market supply will become tighter. The miners wage registrations came as prices of copper rose after increases in demand from China-the worlds largest consumer of copper. Prices rose over 140% aided by mounting signs of economic recovery, after the recession which reduced the demand of copper. Chile produces one third of all copper, therefore these factors, mentioned above, played a major part in the rise of copper prices (a) Three factors that are expected to contribute to a rise in the market equilibrium price of copper Industrial Action About a third of the unionized miners failed to show up when their shifts began at 2 a.m. on Monday. As a result, Chiles Codelco Company, the largest copper mining company, chuquicata mine faced with a problem of less supply of copper, as not enough workers were at work mining for copper. According to the case study Weinberg added This increases fears that market supply will become tighter. As a result of limited supply, there will be a leftward shift in the supply curve causing copper prices to rise. Therefore a new equilibrium price is formed and Chiles Codelco Company will charge a higher price at the new equilibrium. Demand from China The case study explains there is increased demand from china, which is the worlds largest copper consumer. As a result of increased demand this makes the demand curve shift to the right, as China is willing to buy more copper (thus increased demand), which increases the price level, which forms a new equilibrium price. Signs of economic recovery The state of the economy can have a significant effect on the demand for copper. This is particularly true for industrial and to a lesser extent, commercial customers. When economic growth is strong, output from the industrial sectors generally increases. Conversely, when economic growth slows down, output from industrial sectors drops. The case study explains prices of copper were propelled by mounting signs of economic recovery. As there are signs of economic recovery the demand for copper is likely to increase as a result Chiles Codelco company demand curve is likely to shift to the right. This increase in demand will result in a new equilibrium price, which is higher than before. Considering the above demand and supply diagram (Figure 1) we could see that as a result of unionized workers failing to show up when their shifts begin, has limited the supply of copper. As a result there is a leftward movement of the supply curve from S1 to S2, and due to reduced supply of copper, copper prices is lifted causing the price to rise from P1 to P2. This reduction in supply and increase in price has forced the equilibrium price to change. Equilibrium price refers to the point where at any price for which the quantity demanded and the quantity supplied is equal. This new equilibrium point is E2 which was formerly E1. If we consider the above diagram figure 2, since there is increase in demand for copper from China, the demand curve in the demand and supply diagram shifts outward(rightward) to form a new demand curve from D1 to D2. This increase is demand has prompted Chiles Codelco Company to increase prices from Q1 to Q2 in order to balance demand and supply, which leads to increase in quantity demanded from Q1 to Q2. As a result of an increase in price and increase in quantity there is a new equilibrium point formed (E2) which was formerly E1. If we look at the above diagram Figure 3, we could see that as mounting signs of economic recovery, the demand for copper are likely to increase. As a result the Demand curve (D1) shifts rightward to form a new demand curve D2. This will cause the price to increase as well from P1 to P2, since there will be a high demand for copper, this increase in price will cause the quantity demanded to increase from Q1 to Q2. The increase in price which caused an increase in quantity demanded leads to a new Equilibrium price, this is where at any price for which the quantity demanded and the quantity supplied are equal. The new equilibrium point is E2, which was formerly E1, resulted as there was increase in demand and an increase in price. (c) Four factors which could affect world demand for copper; Price of Copper The law of demand, states that there is an inverse relationship between the price of a good or service and the quantity buyers are willing to purchase in a defined time period, ceteris paribus. If we look at this case, if copper prices increase, the demand for copper would fall and vice versa. Therefore the price determinant may affect demand for copper If we look at the above 2 diagrams above, (A) shows if there is an increase in the price of copper from P1 to P2, there will be an decrease in quantity demanded from Q1 to Q2. However since copper has closer substitutes and is sort of a necessity, the impact may not be large. If we look at (B), it shows that a reduction in price from P1 to P2 has increased quantity demanded from Q1 to Q2. However thinking even though the price if copper is reduced the consumption of copper by consumers may be the same, therefore, they will not demand more than what they consume at one point. Number of Buyers If there are many buyers of copper, copper demand may increase, which will also cause prices to increase. In this case, Codelco produces almost 1.6 million tons of copper per year to meet its demand. If in near future companies that use copper as their raw material comes up, the demand for copper will increase. Also, if the number of buyers drops the vice versa can happen which is the demand for copper may drop causing prices to subsequently dropping as well. If we look at the above two demand and supply diagrams, we could see that in (A) there is increased demand for copper from D1 to D2 this may be due to increased number of companies which use copper as their raw material, for e.g. the automobile industry which produces at large quantities may prefer to buy copper at large. This causes the price level to drop, which leads to higher quantity supplied. If we look at diagram (B), we could see that demand for copper has reduced, for e.g. if we consider the current economic recession, one of the major affected industries where supposed to be the automobile industry, as a result the production of vehicles were reduced to a certain extent, this causes the demand for copper to drop as well from D1 to D2. Prices increase and quantity supplied drops from Q1 to Q2. Expectations of Buyers What is the effect in the demand when consumers anticipate future changes in prices, incomes or other factors? If e.g. if we assume the government is going to impose a tax on copper which would raise prices to a higher level, it could lead to an increase in copper demand since they may want to get the benefit of buying it at a cheaper price before the tax was imposed. NOTE: This scenario affects demand if only the consumers are aware of FUTURE price increase in copper. If we consider the above diagram we could see that if in future consumers anticipate a price increase in copper as a result of a tax which is going to be imposed, this will tempt them to purchase copper at large quantity now, rather than later when copper prices are high. This results in increased demand which causes the demand curve to shift to the right and price increase from P1 to P2; this leads to an increased quantity demanded from Q1 to Q2. Prices of related goods If we look at the substitutes for copper, which is a good that competes with another good for consumer purchase, therefore there is a direct relationship between a price change for one good and the demand for its competitor good. Substitutes for copper include, aluminum, zinc etc. If incase the price of the substitutes shot up, the demand for copper may increase since consumers/companies may shift to purchasing copper, also there are circumstances where if prices of copper is too high they may lose it customers, causing demand for copper to drop. (A) (B) Four other factors which could affect the world market supply for copper are as follows; Weather Weather plays a huge part in market supply of copper. Bad weather that includes, heavy rain, hurricanes etc may make mining of copper not possible, as a result the supply of copper is reduced. During periods of heavy rain the supply of copper is often limited, whereas periods of great sunshine enables them to increase quantity of supply. If we look at the above diagram (A), the exact result of a bad weather is illustrated. As a result of bad weather, the supply of copper is reduced from S1 to S2, as a result the price increases from P1 to P2, which causes the quantity supplied to reduce from Q1 to Q2 If we move our attention to diagram B we could see that as a result of good weather the quantity of copper extracted is more which means that price drops from P1 to P2 and supply increases from S1 to S2 plus the quantity supplied also increases from Q1 to Q2. Technology Many state of the art technology has made mining of copper much more easier, comparing to paying wages for 5600 workers, purchasing machinery to get the work done is not only cheap but also the quantity of copper extracted could be more, which means there is increased supply If we look at the above diagram we could see that as a result of improved technology the extracted of copper could be increased, as a result the price of copper will be dropped from P1 to P2 thus increasing supply from S1 to S2 causing quantity supplied increase from Q1 to Q2 Price Exceptions If Codelco anticipates a substantial rise in future copper prices, this would cause them to decrease their current supply of copper, because they may want to gain the most of this benefit, where as if they anticipate future copper price to decrease they would want to produce more copper and sell it at a much higher price than the anticipated low price. If we look at the above diagram, if we consider (A) we could see that if Codelco anticipates the price of copper to increase in near future, supply is restricted or reduced from S1 to S2 causing the price level to increase from P1 to P2, as a result the quantity supplied drops from Q1 to Q2. If we look at diagram (B) if Codelco anticipates a price reduction in near future, they make want to accelerate the production copper, causing price to increase from P1 to P2 which makes the supply curve shift rightward from S1 to S2, this makes quantity supplied increase from Q1 to Q2 a swell. Economies of scale/Input Costs This is a situation in which average cost curve declines as the firm increases output. If so happens the demand curve will shift rightwards. There are circumstances where changes of diseconomies of scale could causing the completely opposite effect .According to the case Codelco company produces around 1.6 million tons of copper per year. Another factor that we could consider is the input prices, if input prices are low Codelco can experience economies of scale. The case study shows shoes evidence that workers at two mines, Chuicata and Mina Sur, demanded a 7.5% pay hike. This shows that the cost of production of copper is high. If incase cheap labour is found and cheap machinery, cost of input is less which makes Codelco supply more copper at cheap prices. Looking at the above two demand and supply diagram, considering (A), we could see that, if codelco experiences economies of scale which means their average cost declines as output increases, they will be able to produce more copper as lesser costs, also aspect which could add to lower costs is due to the fact of less input costs as a result this benefit can be passed onto the consumers as well through low prices which is from P1 to P2. Supply is increased from S1 to S2, causing quantity supplied to increase from Q1 to Q2. Moving our attention to diagram (B) we could see that if Codelco has high input costs, this may make extraction of copper expensive, since they cant bare all the entire costs, they may wish to pass on some of it to the consumers through high costs, as a result supply is reduced from S1 to S2, causing quantity supplied to reduce from Q1 to Q2

Mark Twain :: Free Essays

Just as Huckleberry Finn found peril along the waters of the great Mississippi River, contemporary students often find themselves treading their own 'deep waters' trying to understand and interpret the works of author Samuel Clemens, a.k.a. Mark Twain. But what Huck Finn never had, today's literature students do: the answer to any dilemma of interpretation...a website entitled Mark-Twain-Essays.Com. Tired of crawling through web pages with scant information and little to go on? THIS site contains not one.... not ten... but dozens upon dozens of essays reviewing, analyzing, & critiquing the works of Mark Twain! Whether you're reading The Adventures Of Tom Sawyer for the first time or performing a comparison and contrast between Pudd'nhead Head Wilson and Connecticut Yankee In King Arthur's' Court.Biography: Twain was born in Florida, Missouri in 1835, moving to the city of Hannibal (in the same state) when he was four. His formal schooling ended at the age of twelve, when he became apprenticed to a printer. His natural flair for words took him from printing into journalism, and his wanderlust took him from journalism into the life of a Mississippi riverboat pilot (Ousby 946). Reflecting his own life: Twain depicts much of his early life in the book Life on the Mississippi. As Albert Bigelow Paine writes, "In Life on the Mississippi we have [Twain’s] story of how he met Horace Bixby and decided to become a pilot instead of a South American adventurer -- jauntily setting himself the stupendous task of learning the twelve hundred miles of the Mississippi River between St. Louis and New Orleans -- of knowing it as exactly and as unfailingly, even in the dark, as one knows the way to his own features. It seems incredible to those who knew Mark Twain in his later years -- dreamy, unpractical, and indifferent to details -- that he could have acquired so vast a store of minute facts as were required by that task.

Determination Of Vitamin C Content Of Tablet Essay

ABSTRACT In this experiment, the vitamin C content of a commercial tablet is determined and compared with the manufacturers’ specification. Vitamin C is water-soluble and is an enantiomer of ascorbic acid. (Commercial vitamin C is often a mixture of ascorbic acid and other ascorbates.) Ascorbic acid, C6H8O6, is a reducing agent that reacts rapidly with iodine (I2). As the iodine is added during the titration, the ascorbic acid is oxidized to dehydroascorbic acid, while the iodine is reduced to iodide ions as shown in the following equation. Ascorbic acid + I2 (aq) ———–> 2I- (aq) + dehydroascorbic acid Due to this reaction, the iodine formed is immediately reduced to iodide as long as there is any ascorbic acid present. The amount of ascorbic acid is determined by the stoichiometry of the equations and the difference between the total amount of iodine present and the amount that reacts with the thiosulphate. This method is suitable for use with vitamin C tablets, fresh or packaged fruit juices and solid fruits and vegetables. INTRODUCTION Vitamins are a group of small molecular compounds that are essential nutrients in many multi-cellular organisms, and humans in particular. L-Ascorbic acid was first isolated as a pure substance by Albert Azent-Gyorgi and Charles Kingin 1928 (Pauling, 1970), an anti-oxidant and free radical scavenger, is found ubiquitously in fruit and vegetables such as citrus fruits (oranges, lemons, limes, tangerines etc.), melons, tomatoes, peppers, broccoli, green leafy vegetables such as spinach, potatoes and turnips, its quantitative determination is especially important in the production of wine, beer, milk, soft drinks and fruit juices, where it can be a quality indicator (Gerrior & Zizza, 1994)] .Given the essential role played in the human diet and necessary to growth and repair of tissues in all parts of human body .It is necessary to form collagen an important skin proteins ,scar tissue ,tendons, ligaments, and blood vessels. Vitamin C  is essential for the healing of wounds, and for th e repair and maintenance of cartilage, bones and teeth (Mcevoy, 1993) one of the several ways of determining the ascorbic acid content of a solution is by titration. Figure structure of vitamin c (ascorbic acid) Titration is a volumetric analysis and is one of the basic analytical techniques in chemistry which enables one to quantitatively determine how much of a specific substance is contained in a given sample. This technique is involved in almost every aspects of our daily living such as life sciences, clinical chemistry, water pollution, industrial analyses etc. In order to make meaningful titration analysis, one has to understand and learn the principles involved. Several types of titration techniques are now available but, two general types which are still in much use are acid-base and reduction-oxidation (Redox). Acid-base titration involves the neutralization reaction and the products are generally salt and water. Redox titrations involve the titration of an oxidizing agent (or oxidant) with a reducing agent (or reductant) or vice versa. Oxidation process involves loss of electrons while reduction process involves gain of electrons. Thus an oxidizing agent is one which accepts electr ons while a reducing agent is one which loses the electrons. There must be a sufficiently large difference between the oxidizing and reducing capabilities of these agents for the reaction to undergo completion with a sharp end point. MATERIALS AND METHOD 250-mL conical flask Vitamin C tablets 400-mL beaker KBrO2 solution 50-mL, 25ml and 10ml measuring cylinder 10% KI solution 50-mL burette with stand 2.0 M H2SO4 solution Glass stirring rod Starch indicator Analytical balance A. STANDARDIZATION OF SODIUM THIOSULPHATE 1. A standard titration setup was framed up using a stand, a burette clamp and a white tile Figure 2 setup for titration (Courtesy of http://www.chemteach.ac.nz) 2. A burette was rinsed with distilled water and then with the given sodium thiosulphate solution. 3. With the stopcock closed, the rinsed burette was fully filled up with the sodium thiosulphate solution and then the stopcock was opened so that the tip of the burette was also allowed to be filled up. The initial burette volume was recorded to an accuracy of 2 decimal places 4. A 25.00cm3 pipette was rinsed with distilled water, and then with KBrO3 solution. 5. 25.00cm3 of standard solution of KBrO3 was transferred to a clean conical flask using the rinsed pipette. 6. Using a 25cm3 measuring cylinder, 25ml of 2M H2SO4 was transferred into the conical flask containing the KBrO3 solution. 7. Using a 10ml measuring cylinder, 5ml of 10% KI solution was also added to the conical flask containing the KBrO3 solution. 8. Immediately, the reaction mixture in the conical flask was titrated with the sodium thiosulphate solution until a pale yellow solution was observed. 9. A few drops of starch solution were added to the pale yellow solution in the conical flask. 10. Titration of the mixture was continued until the solution changed from dark blue to colorless. The final burette reading, accurate to 2 decimal places, was recorded. the volume of the sodium thiosulphate solution added was calculated 11. Apart from the first trial, 2 more successive titrations were carried out. The burette was refilled in between runs when the volume remaining was not enough for a complete titration. B. ANALYSIS OF VITAMIN C TABLETS Figure 3 vitamin c tablets (Courtesy of lule.blogspot.com) 1. A tablet of vitamin c was transferred into a 250ml conical flask and  approximately 40cm3 of 2M H2SO4 was added. The tablet was then crushed to dissolve until a solution formed. 2. Using a measuring cylinder, 10cm3 of 10% KI solution was added to the tablet solution and 25cm3 of standard KIO3 solution was pipetted in to the flask. 3. The solution was then immediately titrated with standard thiosulphate solution in the burette until the dark color changed to the original color of the tablet. 4. This procedure was repeated with 2 more samples of the tablet. 5. The volume of sodium thiosulphate used in each titration was recorded and the average volume was calculated. RESULTS AND CALCULATIONS TRIALS INITIAL READINGS FINAL READINGS TITRE VOLUME AVERAGE TITER 1 0.85 33.60 32.75 32.33 2 0.80 33.10 32.30 3 14.85 46.80 31.95 Table results from standardization of sodium thiosulphate (A) Number of moles of KBrO3 in 25cm3 solution = [this formula is used because the molarity of the solution is given and the volume is known]  0.00964Ãâ€"0.025=0.000241mol Mass of KBrO3 solution used= [this formula is used in deriving the mass of a substance when the no. of moles is given (or derived)]=0.000241molÃâ€"167g/mol=0.040247g= 40.25mg Concentration of KBrO3 = No. of moles of Na2S2O3 required for one titration = 0.00241molÃâ€"6= 0.01446mol Moles of I2 liberated = 2.41Ãâ€"10-4 moles Concentration of Na2S2O3= 0.298mol/dm3 TRIALS INITIAL READINGS FINAL READINGS TITRE VOLUME AVERAGE TITER 1 8.80 11.70 2.90 3.43 2 11.70 15.20 3.50 3 15.20 19.10 3.90 Table 2 results from vitamin C analysis (B) Brand of vitamin C: Cenovis Manufacturer’s specification of vitamin c tablet: 1000mg of vitamin c per tablet Molar mass of vitamin C (C6H8O6) = 12Ãâ€"6+1Ãâ€"8+16Ãâ€"6=176g/mol Balanced Equation for reaction = KIO3+5KI+3H2SO4→ 3I2+3H2O+3K2SO4 Number of moles of KIO3 in 25cm3 solution = 0.00100 mol Moles of I2 produced by 25cm3 of KIO3= 0.00100Ãâ€"3= 0.003 moles No of moles of Na2S2O3 needed to react with excess I2 Moles of I2 that reacted with sodium thiosulphate No. of mole of Na2S2O3 = No. of mole of original I2 – no. of mole of excess I2 =0.000723- 0.0005=0.000223mol No. of mole of I2 that reacted with ascorbic acid = 0.006-0.0005 = 0.0055 Mass of ascorbic acid = 176Ãâ€"0.0055= 0.92g =920mg CONCLUSION The experiment was successfully carried out and the results were encouraging. The analysis of the vitamin c content of the Cenovis tablet was carried out using titration. The vitamin c tablet was crushed into a conical flask and specific amounts of KI and KIO3 were added. The solution was then titrated with standard thiosulphate solution until the required color was derived. The results were recorded and calculations to determine the amount of ascorbic acid in each tablet was also successfully done. However the results  from the experiment showed different values from the manufacturer’s specifications. The manufacturer (Cenovis) claims that each vitamin c tablet contains 1000mg of ascorbic acid while this experiment shows otherwise. After calculations were done, the experiment found each vitamin c tablet to be containing about 920mg of ascorbic acid which is below the manufacturer’s specification. However this error could be as a result of different factors; 1. The ma nufacturer of the tablet made wrong analysis of the tablet. 2. This experiment contained errors which arose from wrong reading of instruments, wrong calibration of instruments, or errors in uncertainty. Works Cited Gerrior, S., & Zizza, C. (1994). Nutrient content of the U.S food supply, 1909-1990. Washington D.C: U.S department of Agriculture. Mcevoy, G. (1993). Drug information the american hospital formulary service. American society of health-system pharmacist. Pauling, l. (1970). vitamin c and the common cold. studymode.js. (2010). commercial vitamin c tablet analysis. Retrieved from studymode: http://www.studymode.com/essays/Commercial-Vitamin-c-Tablets-Analysis-470526.html

Maturity in the Secret Life of Bees Essay

â€Å"One is not born but rather becomes a woman†- Simone De Beauvoir. In Sue Monk Kidd’s, The Secret Life of Bees, Lily Owens engages on a life changing expedition to make sense of her difficult predicament. Lily shows that she is a dynamic character as she matures in this coming of age novel. Lily portrays growth throughout the novel with her behavior with T. Ray, her prejudice view on the people who surround her, and her poor judgement about her mother. Lily, the protagonist in The Secret Life of Bees, drastically changes her behavior with T. Ray throughout the course of the novel. Although at first screams and argues with him, Lily soon transforms and has a talk with T. Ray in a polite manner. In the beginning, while speaking with T. ray about Rosaleen being in jail, an argument breaks out about her mother when T. Ray tries to hit her. Lily then shouts at him stating, â€Å"‘my mother will never let you touch me again! [ †¦] I hate you!’† T. Ray then gets angry and replies saying, â€Å"’you think that goddamn woman gave a shit about you? [†¦] The truth is, your sorry mother ran off and left you. The day she died, she’d come back and get her things, that’s all. You can hate me all you want, but she’s the one who left you† (38-39). As soon the fight is over, the words sink in and settle in Lily’s mind which she is now concerned and questioning her mother leaving her as a child which causes her to pack her things, rescue Rosaleen and runs away to Tiburon. Over a period of time that Lily spends there with the Boatwright sisters and Zach she matures. Although the scenario still lingers in her mind Lily continues to live her life. When T. Ray finally finds Lily, Lily invites him into the house and talks to him in a respectful way. T. Ray starts by saying, â€Å"’Well, well, well. Look who’s here.’† Lily then responds saying, â€Å"’won’t you come in? [†¦] have a seat if you want to’† (290). Lily’s demeanor towards her father is surely apparent than her past conversations with him. Even though it is evident that she would never go back home with him, she still shows him respect. Lily’s growth is proven through her modification in behavior towards her father. Throughout the novel, Lily experiences some hurtful thoughts about the people who take her in. Even though she has nothing against colored people, Lily thinks some prejudice thoughts about the Boatwright’s and Zach. After August shows Rosaleen and Lily where they are going to sleep, she starts to remember what T. Ray said about colored women and reveals her own thoughts: â€Å"T. Ray did not think colored women were smart. Since I wanted to tell the whole truth, which means the worst parts, I thought they could be smart, but not as smart as me, me being white. Lying on the cot in the honey house, though, all I could think was August is so intelligent, so cultured, and I was surprised by this. That’s what let me know I had some prejudice buried inside me. † (78) Lily is very shocked that she thinks this way about colored people and soon acknowledges her bias thoughts. Despite the fact that Lily may have noticed her prejudice act, she still continues down the same path without noticing. While hanging out with Zach on the grass, Zach tells Lily that he doesn’t have much of a future since he is a Negro and she tells him how doing sports is the only way he can be successful. She goes and says, â€Å"’well, you could play football for a college team and then be a professional player. ’† Zach then retorts and says, â€Å"’why is it sports is the only thing white people see us being successful at? I don’t want to play football, I wanna be a lawyer. ’† Lily then comes back again annoyed commenting, â€Å"’that’s fine with me, I’ve just never heard of a Negro lawyer, that’s all. You’ve got to hear of these things before you can imagine them’† (120-121). Lily’s prejudice ways are evident in her harsh comments towards Zach. Even though she says all those rude things, she accepts Zach’s choices and supports it. Lily’s maturity is portrayed through her acceptance of Zach’s choices and wish. While staying at the Boatwright’s, Lily continues to think about what T. Ray told her about her mother leaving her as a child. Lily makes some atrocious comments about her mother in spite of her leaving. While speaking with August after telling her that she’s Deborah’s daughter, she reveals to August how she hates her mother and how her mother never wanted her which August then tells her how T. Ray wanted to put her in Bull Street the mental institution. â€Å"’It was easy for her to leave me; because she never wanted me in the first place†¦ you should’ve let him put her in there. I wish she’d rotted in there’† (252) Obviously, Lily’s negative words and thought have clouded her true feelings about her mother. August soon convinces Lily about her mother leaving. Further into the conversation, August tells Lily that even though her mother left her, she came back for her the day she died which makes think: â€Å"T.  Ray had told me that she came back for her things. But she’d come back for me, too. She’d wanted to bring me here, to Tiburon, to August’s. If only we’d made it. I remember the sound of T. Ray’s boots on the stairs. I wanted to pound my fists against something, to scream at my mother for getting caught, for not packing faster, for not coming sooner. † (254) Lily soon realizes that her mother did love her and wanted to be with her even though she still blames her for not packing faster. Despite the fact that her mother did leave her in the beginning, she still loves her mother, even more now that she knows that she was coming back just for her. Lily’s growth is surely evident due to the fact that Lily had a deeper understanding of what happened the day her mother died and she changed her perspectives on her. The Boatwright sisters, Zach and Lily herself are ultimately the ones to acknowledge for her astonishing change in behavior, her conversion of perspective on the people who take her in, and her modification to her dreadful comments made about her mother which help her grow in many ways. The decisions she makes and paths she takes are influenced with the help from people who love her. In order to mature and gain an understanding, Lily goes Tiburon to seek her and her mother’s past, get a deeper understanding of why her mother left in the first place and change her view on things. It is apparent that people will do anything to get answers to complex questions that may be lingering in the minds, and on the way to getting their answers they experience growth, love and compassion and leave with a deep understanding.