A 1.0 kg ball and a 2.0 kg ball are connected by a 1.0-m-long rigid, massless rod. The rod and balls are rotating clockwise about their center of gravity at 20 rpm. What torque will bring the balls to a halt in 5.0 s?

SOLUTION: Two balls are connected by a rigid,massless rods are a rigid body rotating about an axis through center of gravity.we have placed origin of system on 1 kg ball. The net torque is expressed as = I .to calculate the torque we require the moment of inertia c.g and angular acceleration. The center of gravity is given by x cm = (m 1 1m x )2 2 +m 1 2 x = (1.0 kg)( 0 m)+(2.0 kg)(1.0 m)/(1.0 kg +2.0 kg) cm xcm = 0.667 m ycm = 0...