Potential Energy

A person does $5000 \mathrm{J}$ of work in climbing a tree of height $5 \mathrm{m}$. Calculate the mass of the person.

A body of mass $2 \mathrm{kg}$ is projected vertically up with the velocity of $20 {\mathrm{ms}}^{-1}$. If the energy spent in overcoming air resistance is $100 \mathrm{J}$, the maximum height attained by it is ($\mathrm{g}=10 {\mathrm{ms}}^{-2}$)

The hydraulic press given in the figure is used to raise the mass M through a height of $0.5 \mathrm{cm}$ by performing $500 \mathrm{J}$ of work at the small piston. The diameter of the large piston is $10 \mathrm{cm}$, while that of the smaller one is $2 \mathrm{cm}$. The mass M is:

How to choose zero level of potential energy for a given situation?

What is zero level of potential energy and its importance?

What is elastic potential energy?

What is elastic potential energy? Give some examples also.

The SI Unit of Energy is Joule.

What is meant by elastic potential energy?

Ratio of potential energies of body A and body B will be

Flying birds has

A rod of length $l$ and mass $m$ fixed at one end, is hanging vertically. The other end is now raised so that the rod makes an angle $30°$ with horizontal line. The work done in the process will be :

The gravitational potential energy stored in a box of 150kgf is $1.5\times {10}^{4^{}}J$ . Find the height of the box in meters. (Take 1kgf=10N).

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 $1 \mathrm{kg}$)

Explain gravitational potential energy? Also derive the equation of it.

What is gravitational potential energy? Derive its equation.

An electric motor has a power of $2 \mathrm{hp}$ and is used to run water pump. The water pump takes $15 \mathrm{minutes}$ to fill an overhead tank. The capacity of the tank is $1000 \mathrm{l}$ 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 $1 \mathrm{kg}$)

What is Elastic potential energy?

State the SI unit of energy.

A ball at rest is dropped from a height of$15\mathrm{m}$. It loses $30\%$ of its initial $\mathrm{K}.\mathrm{E}.$in striking the ground, If the height to which it bounces is $x \mathrm{m}$ then find the value of $x$.