JEE Main Physics question

Physics Gravitation JEE Main

If gravitational constant is decreasing with time, what will remain unchanged in case of a satellite orbiting around the earth? [DCE 1999, DCE 2001]

(A)Time period
(B)Orbiting radius
(C)Tangential velocity
(D)Angular momentumCorrect

Answer: (D)

Solution

enters only the radial gravitational force; since the force remains central (along the radius) even as slowly changes, no torque

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Question ID VK-154678