NEET UG PHYSICS MCQ: GRAVITATION

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Statement-1: For the planets orbiting around the sun, angular speed, linear speed, KE change with time, but angular momentum remains constant.
Statement-2: No external torque is acting on the rotating planet. So its angular momentum is constant.

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Correct option: A

Statement-1 is true, Statement-2 is true

Statement-1 is true, Statement-2 is true because planets orbiting the sun experience changes in angular and linear speed due to elliptical orbits, but angular momentum remains constant due to the absence of external torque.

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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)

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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.