Two discs of moments of inertia `I_(1) and I_(2)` about their respective axes
Channel: Doubtnut
Date: 02/08/2020

Two discs of moments of inertia `I_(1) and I_(2)` about their respective axes (normal to the disc and passing through the centre) and rotating with angular speeds `omega_(1) and omega_(2)` are brought into contact face to face with their axes of rotation coincident.  (a) Does the law of conservation of angular momentum apply to the situation ? Why ?  (b) Find the angular speed of the two-disc system.  (c ) Calculate the loss in kinetic energy of the system in the process.  (d) Account for this loss.