Physics : Multiple-Choice Questions on Gravitation

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Physics: Multiple Choice Questions on Gravitation

If the radius of the Earth were increased by a factor of 5 and its mass remained the same, then the acceleration due to gravity on the Earth would

increase by a factor of 5

reduce by a factor of 5

increase by a factor of 25

reduce by a factor of 25

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

If the distance between two masses is increased by a factor of 3, the gravitational force of attraction between them will

reduce by a factor of 3

increase by a factor of 3

remain Same

reduce by a factor of 9

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

(R₂ /R₁)²

(R₁ /R₂)²

R₂ /R₁

A reference frame attached to the Earth

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

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.

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