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
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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.
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.
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
The SI unit of pressure is the pascal
Indicate whether the statement is true or false