Question

A large disc has mass 2kg and radius 0.2 m and initial angular velocity 50 rad/s and small disc has mass 4kg and radius 0.1 m and initial angular velocity 200 rad/s both rotating about their common axis. Then the common final angular velocity after discs are in contact is,
A. 100 rad/s
B. 125 rad/s
C. 200 rad/s
D. 150 rad/s

Answer 1

Correct Answer - A
`I_(1)omega_(1)+I_(2)omega_(2)=(I_(1)+I_(2))omega`