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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A uniform heavy disc is rotating at constant angular velocity about a vertical axis through its centre and perpendicular to the plane of the disc. Let be its angular momentum. A lump of plasticine is dropped vertically on the disc and sticks to it. Which will be constant?

Answer: (C)

Solution

The plasticine falls with purely vertical momentum, so it carries zero angular momentum about the vertical axis. The

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Question ID VK-159038