NEET UG PHYSICS MCQ: GRAVITATION

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Assertion: Angular speed of a planet around the sun increases, when it is closer to the sun.

Reason: Total angular momentum of the system remains constant.

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Correct option: A

If both assertion and reason are true and reason is the correct explanation of the assertion.

Option A (If both assertion and reason are true and reason is the correct explanation of the assertion) is correct because angular momentum conservation leads to an increase in angular speed when the planet is closer to the sun.

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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.