In a game of football outdoors on a cold day, a player will begin to feel exhausted after using approximately 8.0 x 10 J of internalenergy. (a) One player, dressed too lightly for the weather, has to leave the game after losing 7.0 x 10° Jof heat. How much work has hedone? (b) Another player, wearing clothes that offer better protection against heat loss, is able to remain in the game long enough to do2.3x 105 J of work. What is the magnitude of the heat that he has lost?(a) NumberUnits(b) NumberUnits<.

Given : ∆U = -8 × 105 J (negative because internal energy is lost before being exhausted) In part…

Answered: In a game of football outdoors on a…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Problem 12: A system does 1.9 × 108 J of work while 5.5 x 108 J of heat is transferred from the system to the environment. What is the change in the internal energy, in joules, of the system assuming there are no other changes (such as in temperature or by the addition of fuel)? AU =
If 2 forms of energy transfer act on a sample of 2.0 moles of ideal monatomic gas = 1.5 x 103 J and work is done on the gas, and 2.5 x 103 J of heat is removed from it, what is the resultant temperature change of the gas sample?
Imagine a physics lecture hall with 83 students who are settling in for a 1-hour lecture. At the start of the lecture, the temperature of the air in the room is a comfortable 70oF (21.1°C). Unfortunately, the room’s air conditioner breaks right as the lecture begins. Each student has an average power output of about 60.0 W at room temperature. Imagine the energy released by each student goes into heating just the air in the room, which has a volume of 9.50 × 102 m3 and a density of 1.20 kg/m3. Assume the volume of the air remains constant and the specific heat capacity of the air is 718 J/(kg · °C). Calculate the room’s temperature at the end of the lecture in oF (the answer may sound high (!), but in reality, a significant portion of the heat produced would be absorbed by the walls, ceiling, floors, chairs, desks, and so on, which we are neglecting).
A 46-kg woman cheats on her diet and eats a 555-Calorie (555 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. stairs (c) If the human body is only 20% efficient in converting chemical energy to mechanical energy, how many stairs must the woman climb to work off her breakfast? stairs Need Help? Read It
A system undergoes a two-step process. In the first step, the internal energy of the system increases by 230 J when 166 J of work is done on the system. In the second step, the internal energy of the system increases by 115 J when 191 J of work is done on the system. For the overall process, find the heat added to the system (including sign).
A Carnot heat engine uses a hot reservoir consisting of a large amount of boiling water and a cold reservoir consisting of a large tub of ice and water. In 5 minutes of operation of the engine, the heat rejected by the engine melts a mass of ice equal to 3.25×10−2 kg. Throughout this problem use Lf=3.34×105J/kg for the heat of fusion for water. During this time, how much work W is performed by the engine?
When 1.00 g of water at 100 °C changes from the liquid to the gas phase at atmospheric pressure, its change in volume is 1.67 × 10−3 m3 . (a) How much heat must be added to vaporize the water? (b) How much work is done by the water against the atmosphere in its expansion? (c) What is the change in the internal energy of the water?
A storage building with well-insulated walls and containing 750 m³ of air at 275 K is heated at constant pressure (atmospheric). Consider air to be an ideal diatomic gas. (a) Determine the energy (in kJ) required to increase the temperature of the air in the building by 2.30°C. kJ (b) Determine the mass (in kg) this amount of energy could lift through a height 2.30 m. kg
Consider the change in the internal energy of a system. -What is the change in the internal energy, in joules, of a system that does 4.725 × 105 J of work, while 3.2 × 106 J of heat is transferred into the system and 7.8 × 106 J of heat is transferred from the system to the environment?
You wish to chill 12 cans of soda at 25.0 °C down to 5.0 °C beforeserving them to guests. Each can has a mass of 0.354 kg, and thespecific heat of soda is the same as that of water. (a) How muchthermal energy must be removed in order to chill all 12 cans?(b) If the chilling process requires 4.0 h, what is the average rate(in W) at which thermal energy is removed from the soda?
Suppose that you have left a 200 mL cup of coffee sitting until it has cooled to 30◦ C, which you find totally unacceptable. Your microwave oven draws 1100W of electrical power when it is running. If it takes 45s for this microwave oven to raise the temperature of the coffee to 60◦ C, what is the efficiency of heating with this oven? You will need to use the fact that 4.2 J of energy is required to raise the temperature of 1.0 mL of coffee by 1.0◦ C.
Question 4. A 5.0 kg block of aluminium is heated from 20°C to 90°C at atmospheric pressure. Find (a) the work done by the aluminium, (b) the amount of energy transferred to it by heat, and (c) the increase in internal energy.

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