Physics : Multiple-Choice Questions on Gravitation

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Physics: Multiple Choice Questions on Gravitation

Two planets of radii R₁ and R₂ have the same density. The ratio of their accelerations due to gravity at the surface is

(R₁ /R₂)²

R₂ /R₁

(R₂ /R₁)²

R₁ /R₂

If the distance between two masses is increased by a factor of 4, the gravitational force of attraction between them will

reduce by a factor of 16

remain Same

reduce by a factor of 4

increase by a factor of 4

A reference frame attached to the Earth

is an inertial frame by definition.

cannot be an inertial frame of reference because of the Earth's rotation and revolution.

is an inertial frame because Newton's laws of motion are applicable inside it.

is not an inertial frame because the Earth moves with respect to the Sun.

An Earth satellite of mass m revolves at a height h 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 moving around the Sun in a circular orbit of circumference C. The work done on the planet by the gravitational force F of the Sun is

F/C

Zero.

FC/2

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