Work and Energy...

Moon revolves around the earth due to gravitational force (F) of earth on moon. The work done by the gravitational force is (r = radius of circular orbit of moon)

A load of 50 kg is pulled upward by 5 m. The work done by the external force is (g = 10 m/s2)

A body is moved through a distance of 3 m in the following different ways. In which case is the maximum work done?

A body of mass 1 kg has a potential energy of 1 joule relative to the ground, when it is at a height of

Two bodies of equal weight are kept at heights of h and 1.5h, respectively. The ratio of their PE is

A flying aeroplane possesses

In the SI system, the unit of potential energy is

Two particles of masses 1 g and 4 g have equal kinetic energies. What is the ratio between their momenta?

Newton-metre is the unit of

A force of 10 N displaces a body by 6 m in 3 seconds. The power of the agency applying the force is