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

Physics & Space Science

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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

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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?

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Venus has a higher average surface temperature than Mercury. Why?

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