A diver makes `2.5` revolutions on the way from a `10-m-high` platform to the water. Assuming zero initial vertical velocity, the average angular velocity during the dive is.

A fan is rotating with angular velocity 100 rev s^-1 . Then is switched off. It takes 5 min to stop. (a) Find the total number of revolution made before the fan stops. (assume uniform angular retardation). (b) Find the value of angular retardation. ( c) Find the average angular velocity during this interval.

A fan is rotating with angular velocity 100 rev s^-1 . Then is switched off. It takes 5 min to stop. (a) Find the total number of revolution made before the fan stops. (assume uniform angular retardation). (b) Find the value of angular retardation. ( c) Find the average angular velocity during this interval.

A professional diver of mass 60kg performs a dive from a platform 10m above the water surface. Find the magnitude of the average impact force experienced by him if the impact time is 1s on collision with water surface. Assume that the velocity of the diver just after enering the water surface is 4ms^(-1)(g =10 ms^(-2)) .

Suppose a person of mass m stands at the edge of a circular platform of radius R and moment of inertia I . The platform is at rest initially, but the platform begins to rotate when the person begins to move with velocity v . Determine the angular velocity of the platform.

5A ball is thrown horizontally from a height of 20 m. It hits the ground with a velocity three times its initial velocity. The initial velocity of ball is

A person of mass m stands at the edge of a circular platform of radius R and moment of inertia. A platform is at rest initially. But the platform rotate when the person jumps off from the platform tangentially with velocity u with respect to platfrom. Determine the angular velocity of the platform.