Find the ratio of total kinetic energy to the rotational kinetic energy of a rolling sphere moving along a horizontal plane.

What is kinetic energy?

Find an expression for the total kinetic energy of a rolling body.

Can kinetic energy be negative?

What is the kinetic energy of an object?

Give one example of kinetic energy.

Write an expression for the kinetic energy of an object.

What is the source of the kinetic energy of the falling rain drop?

From kinetic gas equaton, show that total kinetic energy of 1 mol of ideal gas is 3/2RT.

Write down the formula for average translational kinetic energy of a gas molecule.

(a) A child stands at the centre of a turntable with his two arms outstretched. The turntable is set rotating with an angular speed of 40 rev/min. How much is the angular speed of the child if he folds his hands back and thereby reduces his moment of inertia to 2/5 times the initial value? Assume that the turntable rotates without friction. (b) Show that the child’s new kinetic energy of rotation is more than the initial kinetic energy of rotation. How do you account for this increase in kinetic energy?