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5/31 MCQs for:
Gravitational fields
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?

An Earth satellite of mass m revolves at a height from the surface of the Earth. If R is the Earth's radius and g is the acceleration due to gravity at the surface of the Earth, then the velocity of the satellite is given by:

A planet is discovered to orbit around a star in the galaxy Andromeda, with the same orbital diameter as the Earth around our Sun. If that star has 4 times the mass of our Sun, what will the period of revolution of that new planet be, compared to the Earth's orbital period?
At a distance of 14000 km from some planet's center, the acceleration of gravity is 32 m/s2. What is the acceleration of gravity at a point 28000 km from the planet's center?
Two objects attract each other gravitationally. If the distance between their centers is cut in half, the gravitational force: