One of the predictions of general relativity that was not predicted by special relativity is that
A. space is curved near massive objects.
B. time dilates with speed.
C. length decreases with speed.
D. F = ma does not work for relativistic objects.
Answer: A
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Protostars are difficult to observe because
a. the protostar stage is very short. b. they are surrounded by cocoons of gas and dust. c. they radiate mainly in the infrared. d. the protostar stage is very short, they are surrounded by cocoons of gas and dust, and they radiate mainly in the infrared. e. they are all so far away that the light hasn't reached us yet.
The ocean thermal energy conversion project uses the surface water near tropical islands with a temperature of 20°C as the hot temperature reservoir,
and the water at some depth, with a temperature of 5.0°C, as the cold temperature reservoir for a heat engine. What is the maximum possible efficiency of an engine running between those two temperatures? A) 30% B) 4.7% C) 7.9% D) 15% E) 5.1%
A line representing a wave front for a wave should be drawn:
a. from the source to the receiver. b. from one crest to the preceding crest. c. in the direction the wave is moving. d. along one of the crests of the wave.
How much power is theoretically available from a mass flow of 1 000 kg/s of water when it falls a vertical distance of 100 meters?
a. 980 kW b. 98 kW c. 4 900 W d. 980 W e. 9 600 W