Embibe Experts Solutions for Chapter: Work, Energy and Power, Exercise 1: NEET - 17th July 2022

The energy that will be ideally radiated by a $100 \mathrm{kW}$ transmitter in $1$ hour is

An electric lift with a maximum load of $2000 \mathrm{kg}$ (lift $+$ passengers) is moving up with a constant speed of $1.5{ \mathrm{m} \mathrm{s}}^{-1}$. The frictional force opposing the motion is $3000 \mathrm{N}$. The minimum power delivered by the motor to the lift in watts is : $\left(g=10{ \mathrm{m} \mathrm{s}}^{-2}\right)$

A particle is released from height $S$ above the surface of the Earth. At a certain height its kinetic energy is three times its potential energy. The height from the surface of the earth and the speed of the particle at that instant are respectively___

Water falls from a height of $60 \mathrm{m}$ at the rate of $15 \mathrm{kg} {\mathrm{s}}^{-1}$ to operate a turbine. The losses due to frictional force are $10\%$ of the input energy. How much power is generated by the turbine? $\left(g=10 \mathrm{m} {\mathrm{s}}^{-2}\right.)$

Body $A$ of mass $4m$ moving with speed $u$ collides with another body $B$ of mass $2m$ at rest. The collision is head on and elastic in nature. After the collision, the fraction of energy lost by the colliding body $A$ is

A mass $m$ is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break, when

A force $F=20+10y$ acts on a particle in $y$-direction where $F$ is in Newton and $y$ is in meter. Work done by this force to move the particle from $y=0$ to $y=1\mathrm{ }\mathrm{m}$ is

The work done to raise a mass $m$ from the surface of the earth to a height $h$, which is equal to the radius of the earth is: