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NEET UG PHYSICS MCQ: GRAVITATION

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A small satellite is in elliptical orbit around Earth as shown. If L denotes the magnitude of its angular momentum and K denotes kinetic energy

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Correct option: D

{L_2} = {L_1}\,and\,{K_2} > {K_1}

Option D (

{L_2} = {L_1}\,and\,{K_2} > {K_1}

) is correct because angular momentum is conserved in an elliptical orbit, and kinetic energy is greater at the point closest to Earth.

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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}

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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.