A rigid body rotates through an angle of `270^@` in 2 seconds. what is its average angular velocity in radian/second?

What is the angular velocity of hour hand of a clock in radian ?

A wheel starting from rest is rotating with constant angular acceleration of 2 rad/s^2 . A student notes that it traces an angle of 80 radians in 4 sec interval. What was the angular velocity of the wheel, when the student started his observation ?

A scooter is going towards east at 10m/s turns right through an angle of 90^@ . If the second remains unchanged in taking this turn.what is the change in the velocity of scooter ?

A body thrown vertically upwards reaches a height of 30m in 4 seconds. Does it cover the first half of its journey in 2 seconds ? Give reason for your answer

Calculate work done in rotating a bar magnet of magnetic moment 5Am^@ when rotated through an angle of 180^@ from its rest position parallel to an external magnetic field of 0.4 T.

A body has angular velocity of 4 rad/s at t= 4 seconds and at t =9 seconds the angular velocity is observed to be 22 rad/s. determine the angular acceleration of the body.

State whether the following statements are True (T) or False (F): A plane mirror rotates with a angular velocity, 'w' then the reflected ray. Rotates with an angular velocity '2w'.