NEET UG PHYSICS MCQ: GRAVITATION

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Analyzing +4 | -1

Statement I: At height

h

from ground and at depth

h

below ground, where

h

is approximately equal to

0.62 \mathrm{R}

, the value of

\mathrm{g}

acceleration due to gravity is same.

Statement II: Value of

\mathrm{g}

decreases both sides, in going up and down.

View answer and explanation

Correct option: B

If both Statement - I and Statement - II are true but Statement - II is not the correct explanation of Statement - I.

Option B is correct because both statements are true, but Statement II doesn't fully explain the specific height mentioned in Statement I. The decrease in g with height and depth are due to different reasons.

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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

around the earth so as to rotate opposite to each other. If they collide inelastically and stick together as wreckage, the total energy of the system just after collision is Statement-1: There is almost no effect of rotation of earth at poles.
Statement-2: Because rotation of earth is about polar axis.