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NEET UG PHYSICS MCQ: GRAVITATION

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If

{g_e},\;{g_h}\,and\,{g_d}

be the accelerations due to gravity at earth’s surface, a height

h

and at depth

d

respectively. Then

View answer and explanation

Correct option: B

{g_e} > {g_h} < {g_d}

Option B (

{g_e} > {g_h} < {g_d}

) is correct because gravity decreases with height and increases with depth initially.

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If a particle of mass m is moving in a horizontal circle of radius r with a centripetal force

\left( { - K/{r^2}} \right)

the total energy is Suppose the law of gravitational attraction suddenly changes and becomes an inverse cube law i.e.

F \propto \frac{1}{r^3}

, but still remaining a central force. Then Two satellites A and B go round a planet P is circular orbits having radii 16 R and 2 R respectively. If the speed of satellite A is

6\,m{s^{ - 1}}

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v

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r

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Statement-2: Because rotation of earth is about polar axis.