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Get A 55 Kg Woman Eats A 540 Calorie Jelly Doughnut

Name Class Date ID A phys101spring2014ch11hw Problem 1. A 55-kg woman cheats on her diet and eats a 540-Calorie 540 kcal jelly doughnut for breakfast. a How many joules of energy are the equivalent of one jelly doughnut b How many stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut Assume the height of a single stair is 15 cm* c If the human body is only 25 efficient in converting chemical energy to mechanical energy how many stairs must the woman climb to work off her breakfast 2. An aluminum cup contains 225 g of water and a 40-g copper stirrer all at 27 C. A 400-g sample of silver at an initial temperature of 87 C is placed in the water. The stirrer is used to stir the mixture until it reaches its final equilibrium temperature of 32 C. Calculate the mass of the aluminum cup* - 3. A 50-g ice cube at 0 C is heated until 45 g has become water at 100 C and 5. 0 g has become steam at 100 C. How much energy was added to accomplish the transformation 4. A 100-g cube of ice at 0 C is dropped into 1. 0 kg of water that was originally at 80 C. What is the final temperature of the water after the ice has melted 5. A 40-g block of ice is cooled to -78 C and is then added to 560 g of water in an 80-g copper calorimeter at a temperature of 25 C. Determine the final temperature of the system consisting of the ice water and calorimeter. If not all the ice melts determine how much ice is left. Remember that the ice must first warm to 0 C melt and then continue warming as water. The specific heat of ice is 0. 500 cal/g C 2 090 J/kg C. 6. A 60. 0-kg runner expends 300 W of power while running a marathon* Assuming 10. 0 of the energy is delivered to the muscle tissue and that the excess energy is removed from the body primarily by sweating determine the volume of bodily fluid assume it is water lost per hour. At 37. 0 C the latent heat of vaporization of water is 2. 41 106 J/kg. 7. A thermopane window consists of two glass panes each 0. 50 cm thick with a 1. 0-cm-thick sealed layer of air in between* a If the inside surface temperature is 23 C and the outside surface temperature is 0. 0 C determine the rate of energy transfer through 1. 0 m2 of the window. b Compare your answer to a with the rate of energy transfer through 1. 0 m2 of a single 1. 0-cm-thick pane of glass. Disregard surface air layers. 8. A copper rod and an aluminum rod of equal diameter are joined end to end in good thermal contact. The aluminum rod is held at 0 C. If the copper rod is 0. 15 m long what must be the length of the aluminum rod so that the temperature at the junction is 50 C 9. Measurements on two stars indicate that Star X has a surface temperature of 5 727 C and Star Y has a surface temperature of 11 727 C. If both stars have the same radius what is the ratio of the luminosity total power output of Star Y to the luminosity of Star X Both stars can be considered to have an emissivity of 1. a How many joules of energy are the equivalent of one jelly doughnut b How many stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut Assume the height of a single stair is 15 cm* c If the human body is only 25 efficient in converting chemical energy to mechanical energy how many stairs must the woman climb to work off her breakfast 2. An aluminum cup contains 225 g of water and a 40-g copper stirrer all at 27 C. A 400-g sample of silver at an initial temperature of 87 C is placed in the water.

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