NEET UG PHYSICS MCQ: GRAVITATION

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Assertion: Kepler's second law can be understood by conservation of angular momentum principle
Reason: Kepler's second law is related with areal velocity which can further be proved to be based on conservation of angular momentum as

(d A / d t)=\left(r^2 \omega\right)/2

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Correct option: A

Assertion is True, Reason is True; Reason is a correct explanation for Assertion

Option A is correct because Kepler's second law is a consequence of the conservation of angular momentum, and the areal velocity is directly related to angular momentum.

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

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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.