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?
(a) 6.91 J (b) 14.9 J
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Indicate whether the statement is true or false
A 1.50 kg hollow steel ball is submerged in water. It weighs in water 10.75 N. The volume of the cavity inside the ball is (density of steel is 
A. 0.000139 
B. 0.000213
C. 0.000348
D. 0.000401
E. 0.000476
A dump truck has a large cubical concrete block in its bed. The coefficients of friction between this block and the floor of the bed are µk = 0.450 and µs = 0.650
As the bed is slowly tilted above the horizontal, will the brick first begin to slide or will it first tip over? A) It will first tip over. B) It will first begin to slide. C) It will tip over just as it begins to slide. D) It is impossible to answer without knowing the mass of the block. E) It is impossible to answer without knowing the dimensions of the block.
What are the most likely sources of the methane gas detected in the Martian atmosphere by the Mars Express orbiter and the Curiosity rover?
A) biological activity only B) biological or geological activity C) comet impacts only D) geological activity only