Based on the given pV diagram, match the answers with questions. Isotherms the change in thermal energy for process 0→1 the change in thermal energy for process 0→7 the change in thermal energy for process 0→6 A B C C

Based on the given pV diagram, match the answers with questions. Isotherms the change in thermal energy for process 0→1 the change in thermal energy for process 0→7 the change in thermal energy for process 0→6 A B C C

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter22: Entropy And The Second Law Of Thermodynamics

Section: Chapter Questions

Problem 3PQ: Use a PV diagram such as the one in Figure 22.2 (page 653) to figure out how you could modify an...

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(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 50.0C and a cold reservoir temperature of 20.0C ? (b) How much heat transfer occurs into the warm environment if 3.60107J of work (10.0kWh) is put into it? (c) If the cost of this work input is 10.0cent/kWh, haw does its cost compare with the direct heat transfer achieved by burning natural gas at a cost of 85.0 cents per therm. (A therm is a common unit of energy for natural gas and equals 1.055108J .)
(a) What is the best coefficient of performance for a refrigerator that cools an environment at 30.0C and has heat transfer to another environment at 45.0C ? (b) How much work in joules must be done for a heat transfer of 4186 kJ from the cold environment? (c) What is the cost of doing this if the work costs 10.0 cents per 3.60106J (a kilowatthour)? (d) How many kJ of heat transfer occurs into the warm environment? (e) Discuss what type of refrigerator might operate between these temperatures.
Suppose an ideal (Carnot) heat pump could be constructed for use as an air conditioner. (a) Obtain an expression for the coefficient of performance (COP) for such an air conditioner in terms of Tb and Tc. (b) Would such an air conditioner operate on a smaller energy input if the difference in the operating temperatures were greater or smaller? (c) Compute the COP for such an air conditioner if the indoor temperature is 20.0C and the outdoor temperature is 40.0C.
A power plant has been proposed that would make use of the temperature gradient in the ocean. The system is to operate between 20.0C (surface water temperature) and 5.00C (water temperature at a depth of about 1 km). (a) What is the maximum efficiency of such a system? (b) If the useful power output of the plant is 75.0 MW, how much energy is absorbed per hour? (c) In view of your answer to part (a), do you think such a system is worthwhile (considering that there is no charge for fuel)?
Based on the given pV diagram, match the answers with questions. Isotherms of v the change in themal energy for process 0-1 A. zero - v the change in themal energy for process 0-7 B. not enough information v the change in themal energy for process 0-6 c. negative D. positive
For the heat pump (used for heating) illustrated below, what is its coefficient of performance for heating. Ag? The gas is monatomic. p(Pa) 6 A. 8/3 B. 2 C. 11/3 D. 14/3 E. 19/7 2 V(m³) 34
Q 2 Derive an expression for work done by an ideal gas, in isothermal process.
An ideal gas expands isothermally, performing 5.00×103 J of work in the process. Part A Calculate the change in internal energy of the gas. Part B Calculate the heat absorbed during this expansion.
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In a constant-volume process, 209 J of energy is transferred by heat to 1.50 mol of a Chlorine gas (Cl₂) gas initially at 300 K. What is the work done on the gas? a. zero b. 209 J c. 1.16 x10⁴ J d. insufficient information
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