A heat pump takes in 60.0 J of energy from a 250 K thermal reservoir outside a house and discharges heat energy into a 350 K thermal reservoir inside a house. What is the minimum amount of work needed to make the pump work?

A. 17.2 J
B. 24.0 J
C. 52.0 J
D. 65.0 J


A. 17.2 J

Physics & Space Science

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A 10-N falling object encounters 10 N of air resistance. The net force on it is

A) 0 N. B) 4 N. C) 6 N. D) 10 N.

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A heater is rated at 1200 watts for a 120-volt source.If two heaters are connected in parallel across the 120-volt source, the current in amperes drawn from the source is

a. 5 b. 10. c. 20 d. none of the above.

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According to the second law of thermodynamics, which of the following applies to the heat received from a high temperature reservoir by a heat engine operating in a complete cycle?

a. must be completely converted to work b. equals the entropy increase c. converted completely into internal energy d. cannot be completely converted to work

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The SI unit of pressure is the pascal

Indicate whether the statement is true or false

Physics & Space Science