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Physics 2 Chapter 20 problems Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB.

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Presentation on theme: "Physics 2 Chapter 20 problems Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB."— Presentation transcript:

1 Physics 2 Chapter 20 problems Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB

2 Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB

3 Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB A Carnot refrigerator is operated between two heat reservoirs at temperatures of 320K and 270K. (a) If in each cycle the refrigerator receives 415J of heat energy from the reservoir at 270K, how many joules of heat energy does it deliver to the reservoir at 320K? (b) If the refrigerator completes 165 cycles each minute, what power input is required to operate it? (c) What is the coefficient of performance of the refrigerator?

4 20.25 A sophomore with nothing better to do adds heat to 0.35 kg of ice at 0°C until it is all melted. (a) What is the change in entropy of the water? (b) The source of heat is a very massive body at temperature 25°C. What is the change in entropy of this body? (c) What is the total change in entropy of the system? Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB

5 20.29 Three moles of an ideal gas undergo a reversible isothermal compression at 20°C. During this compression, 1850 J of work is done on the gas. What is the change in entropy of the gas? Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB

6 Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB SOLUTION ON THE NEXT PAGE

7 Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB

8 Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB


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