NEET UG PHYSICS MCQ: GRAVITATION

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Assertion(A): If radius of earth suddenly shrinks to half its present value without changing its mass, then the period of an earth's satellite will not change.
Reason(R): Time period of a satellite does not depend upon the mass of earth.

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Correct option: C

If Assertion is correct but Reason is correct.

Option C (Assertion is correct but Reason is correct) is correct because the assertion about the satellite's period not changing is true, and the reason about the time period not depending on the mass of the earth is also true, but the reason doesn't explain the assertion.

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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}}

the speed of the satellite B will be [in m/s] nearly The total energy of satellite moving with an orbital velocity

v

around the earth is Two satellites of same mass are launched in the same orbit of radius

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.