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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

If the earth shrinks such that its mass does not change but its radius decreases to one-quarter of its original value, then one complete day will take

Answer: (D)

Solution

Angular momentum conservation: $ω_1=ω_2 ⇒ /=/

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Question ID VK-158550