The force that holds a satellite in orbit around Earth is caused by
a) the gravitational pull of Earth.
b) friction as the satellite moves through the air.
c) the thrust of a jet engine always being fired toward the center of the Earth.
d) conservation of angular momentum.
a
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Venus has a higher average surface temperature than Mercury. Why?
A) because its surface is heated by an extreme greenhouse effect B) because it is closer to the Sun C) because its surface is covered with hot lava from numerous active volcanoes D) because its slow rotation gives it more time to heat up in sunlight
Relativity equations for time, length and momentum hold true for
A) relativistic speeds. B) everyday low speeds. C) both of these D) neither of these
How fast must a meter stick move, relative to the frame of the observer making the measurement, so its length will be measured to be 0.60 m?
A) 0.40c B) 0.90c C) 0.70c D) 0.80c E) 0.60c
A large, metallic, spherical shell has no net charge. It is supported on an insulating stand and has a small hole at the top. A small tack with charge Q is lowered on a silk thread through the hole into the interior of the shell. What is the charge on the inner surface of the shell now?
1.Q 2.Q/2 3.0 4.-Q/2 5.-Q