Work Energy

Commercial unit of electrical energy consumption is:

When the force applied and displacement are in opposite directions, the work done is:

The potential energy of an object at the surface of the earth is usually taken as:

If two bodies of mass 1 kg and 4 kg have the same kinetic energy, the ratio of their momenta is:

A bullet fired from a gun can pierce a wooden block due to its:

Which of these devices converts mechanical energy into electrical energy?

What is the work done by a person in lifting a 2 kg mass to a height of 5 m? (g=9.8 m/s^2)

In a hydroelectric power plant, which energy is finally converted into electrical energy?

The Law of Conservation of Energy states that:

A crane lifts a load of 1000 N through a vertical height of 10 m in 5 seconds. Its power is:

When a ball is thrown upwards, the work done by the gravitational force is:

If a force of 1 Newton moves a body by 1 meter in its own direction, the work done is:

What happens to the potential energy of a body if its height from the earth's surface is tripled?

The rate of doing work is measured in:

Two bodies of masses m and 4m are moving with equal linear momentum. The ratio of their kinetic energies is:

A weightlifter holds a 100 kg weight over his head for 10 seconds. Work done by him during these 10 seconds is:

The sum of kinetic and potential energy of a falling body at any point is:

Which form of energy is possessed by a flying bird?

When we wind a watch, we store:

Work done is a maximum when the angle between force and displacement is: