Energy

An object of mass, $m$ is moving with a constant velocity, $v$. How much work should be done on the object in order to bring the object to rest?  

An electric motor of $2.5 \mathrm{hp}$ is used to run water pump. The water pump takes $15 \mathrm{minutes}$ to fill an overhead tank. The capacity of the tank is $1250 \mathrm{l}$ and height is $20 \mathrm{m}$. Find the actual work done by the electric motor to fill the tank. Also find the efficiency of the system. (Density of water = $1000 \mathrm{kg} {\mathrm{m}}^{-3}$ )  (Mass of $1 \mathrm{l}$of water is $1 \mathrm{kg}$)

A bullet mass $110 \mathrm{g}$ moves with a velocity of $800 \mathrm{m} {\mathrm{s}}^{-1}$. It penetrates $35 \mathrm{cm}$ into a target which is stationary and then comes to rest. Find the average retarding force offered by the target and the kinetic energy possessed by the bullet. 

Loudspeaker converts electrical energy to _____ (sound/heat) energy.

If velocity of a moving body becomes one-fourth while the mass remains constant, the kinetic energy of the body

Give one word for the following.
Energy possessed by moving objects. (Kinetic energy/ potential energy)

Assume a boy is dropping a ball, the gravitational potential will be zero when $h=$_____.

How does zero level potential relate to gravitational potential energy?

When petrol is burnt in a car, the _____ energy stored in petrol is used to run the car.

If the velocity of the moving body is halved (m remaining constant), the _____ becomes one-fourth (of the original value).

If the velocity of the moving body is doubled (m remaining constant), the _____ of the body increases by four times.

What energy does an object possess due to its position?

Which form of energy is the stored food energy in Mike getting converted to, when Mike is pushing the box?

Which conversion of energy occurs when an object falls from a height?

The wheels of the turbine spin the generator in a hydro power plant.

Which conversion of energy of water turns the wheels of the turbine?

What is common to all these pictures?

Identify the correct energy conversion that fits in the circle.

Fill in the blank with the correct word.

The energy in objects due to its motion is called _____ of an object.

Name the energy possessed by the nucleus of an atom.