Physics Past Questions and Answers

An object of mass 20kg is released from a height of 10m above the ground level. The kinetic energy of the object just before it hits the ground is

The energy in the nucleus of atoms produce heat which can be used to generate

A machine whose efficiency is 75% is used to lift a load of 1000N. Calculate the effort put in to the machine if it has a Velocity ratio of 4.

A wheel and an axle is used to raise a load whose weight is 800N when an effort of 250N is applied. If the radii of the wheel and axle are 800mm and 200mm respectively, the efficiency of the machine is

A force of 500N¹ is applied to a steel wire of cross-sectional area 0.2m², The tensile stress is