a dumbbell consists of 2 identical balls of mass 1/2 kg each connected to the 2 ends of a 50cm long light rod.it is rotating about a fixed axis through its centre of mass at an angular speed of 10rad/sec. an impulsive force of avg. magnitude 5N acts on one of the masses in its directionof its velocity for 0.1 seconds. find new angular velocity of the system.my actual doubt regarding this question is that why cant we take, change in angular momentum = impulsive force x time ??

Amit Saxena , 11 Years ago

Grade upto college level