Calculate the angular velocity of disc

A circular disc of mass 10 kg and radius 0.2 m is set in to rotation about an axis passing through its centre and perpendicular to its plane by applying torque 10 Nm. Calculate the angular velocity of disc that it will attain at the end of 6 sec from the rest.

Solution 

2.1 Show that the critical velocity of a body revolving in a circular orbit very closed to the surface of planet of radius ‘ R ’ and mean density ρ is Vc = 2 R √ [ (G ρ π ) / 3 ]

Solution- 

1.1 Calculate the angular velocity and linear velocity of a tip of minute hand of length 10 cm.

Solution