Concept of Work

When a body moves with a constant speed along a circle

A $75.0 \mathrm{kg}$ man pushes on a $5.0\times 10 \mathrm{ton}$wall for $250 \mathrm{s}$ but it does not move. How much work does he do on the wall? ($2000 \mathrm{lb}=1 \mathrm{ton}$ and $0.454 \mathrm{kg}=1 \mathrm{lb}$)

A body of mass $5 \mathrm{kg}$ is placed at the origin, and can move only on the x-axis. A force of $10 \mathrm{N}$ is acting on it in a direction making an angle of $60°$ with the axis and displaces it along the x-axis by $4 \mathrm{metres}$. The work done by the force is

A boy throws a ball in upward direction that reaches a height of 10 m. If the mass of the ball is 980 gm, find the work done by the force of gravity.

A block is pushed through $2 \mathrm{m}$ across a surface offering $25 \mathrm{N}$ resistance. The work done by resistance force is 

A body of mass $30 \mathrm{kg}$ is displaced horizontally in a curved path. The body later comes back to that position from where it was displaced. Check whether work is done or not.

A block is pushed through $2 \mathrm{m}$ across a surface offering $25 \mathrm{N}$ resistance. The work done by resisting force is

Why it is easier to roll a stone up a sloping road than to lift it vertical upwards?

A machine which has an efficiency of $80\%$ raises a load of $50 \mathrm{N}$ through a vertical height of $10 \mathrm{m}$. The work input to the machine is

An engine can pump $30,000 \mathrm{lit}.$ of water to a vertical height of $45 \mathrm{m}$ in $10 \min$. Calculate the work done by the machine and its power?

A force of $10 \mathrm{N}$ is applied on $20 \mathrm{kg}$ mass at rest. The work done in the fourth second is

A force of $10 \mathrm{N}$ is applied on an object of mass $1 \mathrm{kg}$ for $2 \mathrm{s}$, which was initially at rest. What is the work done on the object by the force?

A force $F$ acts on a body of mass $m$ initially at rest producing uniform acceleration $a$ for a time interval $t$. The work done on the body is :-

What is the SI unit of work?

What is the CGS unit of work?

Spring constant of a spring is $K = 6 \times {10}^3 \mathrm{N}/\mathrm{m}$. Work done to stretch it ${10}^{-2} \mathrm{m}$from mean position is

Heat and work done by the heat was discovered by

How many joules are equivalent to $1 \mathrm{erg}$ ?

Erg is a bigger unit of energy than joule.

Convert the work-done equal to  $50 \mathrm{J} \mathrm{into} \mathrm{erg}$.