Subject Experts Solutions for Chapter: Work, Energy and Power, Exercise 1: Practice Exercise

A $4 \mathrm{kg}$ mass and a $1 \mathrm{kg}$ mass are moving with equal kinetic energies. The ratio of their momenta is

The power output of a machine that lifts a $600 \mathrm{kg}$ weight through a height of $20 \mathrm{m}$ in $1 \min$ is

A small ball is released from a height $H$ as shown in the figure in a vertical circular track, so that it loops inside of the circular track of radius $R$. The value of $H$ must be

A unloaded car moving with velocity $u$ on a frictionless road can be stopped in a distance $s$. If the passengers add $40\%$ to its weight and breaking force remains the same, then the stopping distance at velocity $u$ is now

Power required by a boy of mass $30 \mathrm{kg}$ to run up a staircase of $40$ steps in $10 \mathrm{s}$ is (height of each step is $15 \mathrm{cm}$) (take, $g=10 \mathrm{m} {\mathrm{s}}^{-2}$)

A particle is moving freely. Then, it's

Which one among the following happens when a swing rises to a certain height from its rest position?

Conservation of momentum in a collision between particles can be understood on the basis of