If the efficiency of a reversible engine is 28%, what is its COP (performance coefficient) operated (a) as a refrigerator, and (b) as a heat pump?
What will be an ideal response?
(a) 2.6 (b) 3.6
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If 
what is the power supplied to the circuit by 
?
A. 4.0 W
B. 8.0 W
C. 12 W
D. 16 W
E. 20 W
What is the ecliptic plane?
A) the plane of Earth's orbit around the Sun B) the plane of Earth's equator C) the plane of the Sun's equator D) the plane of the Milky Way Galaxy
A refrigerator has a coefficient of performance of 1.15, and it extracts 7.95 J of heat from the cold reservoir during each cycle
(a) How much work is done on the gas in each cycle? (b) How much heat is exhausted into the hot reservoir in each cycle?
Equilibrium: A store's sign has a mass of 20 kg and is 3.0 m long. It is uniform, so its center of gravity is at the center of the sign. It is supported horizontally by a small loose bolt attached to the wall at one end and by a wire at the other end, as shown in the figure. What is the tension in the wire?
A. 460 N B. 230 N C. 120 N D. 200 N E. 300 N