Embibe Experts Solutions for Chapter: Work, Energy and Power, Exercise 1: Level 1

Two small particles of equal masses start moving in opposite directions from a point $A$ in a horizontal circular orbit. Their tangential velocities fare $v$ and $2 v$, respectively, as shown in the figure. Between collisions, the particles move at constant speeds. After making how many elastic collisions, other than that at $A$, these two particles will again reach the point$A ?$

Adjacent figure shows the force-displacement graph of a moving body, the work done in displacing body from $x=0$ to $x=35 \mathrm{m}$ is equal to

Which of the following graphs is correct between kinetic energy $\left(E\right),$ potential energy $\left(U\right)$ and height $\left(h\right)$ from the ground of the particle ($h<<R_E$ and $U=0$ at $h=0$)

With how much velocity a block of mass $2 \mathrm{kg}$ move on a frictionless surface so as to compress a spring with force constant $2$ newton/metre by $4$ metres.

For a two particle collision, the following quantities are conserved in general-

A car of mass $m$ is driven with acceleration $a$ along a straight level road against a constant external resistive force $R.$ When the velocity of the car is $V,$ the rate at which the engine of the car is doing work will be

A train weighing ${10}^7 \mathrm{N}$ is running on a level track with uniform speed of $36 \mathrm{km} {\mathrm{h}}^{-1}$ the frictional force is $0.5 \mathrm{kg} \mathrm{f}$ per quintal. What is the power of the engine- $\left(g=10 \mathrm{m} {\sec }^{-2}\right)$

An engine pumps up $100 \mathrm{kg}$ of water through a height of $10 \mathrm{m}$ in $5 \mathrm{s}.$ Given that the efficiency of the engine is $60\%.$ If $g=10 \mathrm{m} {\mathrm{s}}^{–2},$ the power of this engine is: