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Question1

A small ball of mass 2x10-3 kg having a charge of 1uC is suspended by string of length 0.8 m. Another identical ball having same charge is kept at a point of suspension. Find out the minimum horizontal velocity that should be imparted to the lower ball so that it can make one complete revolution?

Question2

Two blocks, of mass m1 = 438 g and m2 = 540 g, are connected by a massless cord that is wrapped around a uniform disk of mass M = 466 g and radius R = 10.0 cm. disk can rotate without friction about a fixed horizontal axis through its center; cord cannot slip on the disk. The system is released from rest. Find (a) magnitude of the acceleration of the blocks, (b) tension T1 in the cord at the left and (c) tension T2 in the cord at the right.

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