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5/31 MCQs for:
Gravitational fields
A satellite is in a low circular orbit about the Earth (i.e., it just skims the surface of the Earth). What is the speed of the satellite? (The mean radius of the Earth is 6.38 x 106 m.)
Two planets have the same surface gravity, but planet B has twice the mass of planet A. If planet A has radius r, what is the radius of planet B?
List the four fundamental forces in nature.
An astronaut goes out for a 'space-walk' at a distance above the Earth equal to the radius of the Earth. What is her acceleration due to gravity?
The hydrogen atom consists of a proton of mass 1.67 x 10-27 kg and an orbiting electron of mass 9.11 x 10-31 kg. In one of its orbits, the electron is 5.3 x 10-11 m from the proton. What is the mutual attractive force between the electron and proton?