Satellite Motion: Satellite A has twice the mass of satellite B, and moves at the same orbital distance from Earth as satellite B. Compare the speeds of the two satellites.
A. The speed of B is twice the speed of A.
B. The speed of B is one-half the speed of A.
C. The speed of B is one-fourth the speed of A.
D. The speed of B is equal to the speed of A.
E. The speed of B is four times the speed of A.
Answer: D
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Your density is slightly greater when you are
A) at the top of a mountain. B) submerged deep in water. C) in a fast-moving vehicle. D) none of the above
Foucault's pendulum:
a. continues to swing back and forth in the same fixed direction relative to the ground. b. keeps swinging faster because the centrifugal force of Earth's rotation affects its weight. c. changes how far it goes on each swing because of Earth's motion around the Sun. d. changes the direction of its back and forth swing because Earth rotates beneath it. e. changes the direction of its back and forth swing because of gravity.
A long, fine wire is wound into a coil with inductance 5 mH. The coil is connected across the terminals of a battery, and the current is measured a few seconds after the connection is made. The wire is unwound and wound again into a different coil with L = 10 mH. This second coil is connected across the same battery, and the current is measured in the same way. Compared with the current in the
first coil, the current in the second coil is: 1.four times as large. 2.twice as large. 3.unchanged. 4.half as large. 5.one-fourth as large.
Carnot Engine: 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. 4.7% B. 5.1% C. 7.9% D. 15% E. 30%