Exam 1 Practice Problems WITH Answers

# The second law of thermodynamics states that a it is

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32. The second law of thermodynamics states that a. it is impossible to construct a heat engine that, operating in a cycle, produces no other e ff ect than absorption of energy from a reservoir and the performance of an equal amount of work. b. energy does not flow spontaneously from a cold object to a hot object. c. the entropy of the universe increases in all natural processes. d. all of the above are correct. e. only (b) and (c) above are correct. 33. In calculating the minimum change in entropy in a portion of a real process, we use 33. How many calories does a 66 kg woman use to climb a 2700 m high mountain? (1 cal = 4.186 J) Dr. Cyril Anoka’s Exam one Review

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34. The temperature of 2.0 kg of water is 270 K. What is its temperature after falling 500 m? The specific heat of water is . 35. A 0.500 kg copper cup is at 280 K. If of energy is added to it, what is its final temperature in K. The specific heat of copper is . a. 389 b. 392 c. 402 d. 409 e. 415 36. Gas in a container expands at a constant pressure of 3 atm. Find the work done in J by the gas if the initial volume is 5 liters and the final volume is 10 liters. (1 atm ) 37. How much heat (in kilocalories) is needed to convert 1 kg of ice at 0°C into steam at 100°C? ( ; ; 1 cal ) 38. Two kg of water at 100°C is converted to steam at 1 atm. Find the change in internal energy in J. (1 atm ; ; 1 cal ) 39. A hot water heater is operated by using solar power. If the solar collector has an area of 6 m 2 , Dr. Cyril Anoka’s Exam one Review
and the power per unit area delivered by sunlight is , how long in hours will it take to increase the temperature of of water from 20°C to 60°C? (1 cal ) a. 2.1 b. 3.2 c. 7.8 d. 4.6 e. 4.1 40. Two equal charges are separated by a distance r . At what point, between the two charges, would a third test charge experience no net electrical force? 41. A charge q is located inside a spherical surface of radius r . What happens to the electric flux when the sphere is replaced by a cube of side r?

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