An refrigerator keeps food in the freezer portion at 
and dumps excess heat into the kitchen, whose temperature is 
If the refrigerator has half the coefficient of performance of an ideal reversible refrigerator, and if its motor can supply 250W of power, what is the rate of heat flow out of the freezer portion of the refrigerator?
A. 340W
B. 300W
C. 1100W
D. 625W
A. 340W
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The inner planets are composed of rock and metal, and the outer planets are rich in low-density gases such as hydrogen and helium
a. True b. False Indicate whether the statement is true or false
Consider the following three items
A. 100 g of steam on the Moon B. 10 g of water on the Earth C. 20 g of ice floating in water on the Earth Put these items in order of increasing density:
1.A < B < C 2.A < C < B 3.B < A < C 4.B < C < A 5.C < A < B 6.C < B < A 7.None of the above 8.Impossible to determineEnergy Levels: A hydrogen atom is excited to the n = 9 level. Its decay to the n = 6 level detected in a photographic plate. What is the frequency of the light photographed? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 5.08 × 1013 Hz B. 5910 Hz C. 5910 nm D. 3.28 × 10-9 km
Two objects are dropped from a bridge, an interval of 1.0 s apart. During the time that both objects continue to fall, their separation
A) increases. B) decreases. C) stays constant. D) increases at first, but then stays constant. E) decreases at first, but then stays constant.