R 39 st 39 A homogeneous sphere of radius R 10 cm rotating about its...

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R 39 st 39 A homogeneous sphere of radius R 10 cm rotating about its vertical diameter is gently released on a hole of radius r 8 0 cm made in a fixed horizontal slab Centre of the hole is vertically below the centre of the sphere The sphere stops in a time interval At 9 0 s Calculate time interval required to stop the same sphere if it is placed rotating with the same angular velocity on a hole of radius r 6 0 cm made in another identical horizontal slab A At At X R x 3 2

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