If the attraction of the sun is suddenly ceased, the earth would continue to move in a straight line making a tangent with the original orbit. This statement is derived from Newton's

Heat may be transferred by conduction, convection and radiation. By which of these methods does heat travel through vacuum?

The part of the human eye that does similar work as the diaphragm of a camera lens is the

A projectile of mass 4kg is fired vertically and reaches a maximum height of 40m. Calculate the potential energy at the highest point
(g = 10ms\(^{-2}\)

The length of the seconds hand of laboratory clock is 0.1m. Calculate the speed at the top of the seconds hand