NEET UG PHYSICS MCQ: GRAVITATION

1 Easy

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Assertion: When a planet moves in elliptical orbit around sun, its angular momentum about sun remains conserved.
Reason: Total energy of the planet remains conserved

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Correct option: B

Assertion is True, Reason is True; Reason is NOT a correct explanation for Assertion

Option B is correct because angular momentum and total energy are both conserved in a planet's elliptical orbit around 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.