Pradeep Singh and Jatinder Singh Solutions for Chapter: Work, Power and Energy, Exercise 1: CHAPTER TEST

A man weighing $70 \mathrm{kg}$ carries a weight of $10 \mathrm{kg}$ to the top of tower $100 \mathrm{m}$ high. Calculate the work done.

A block of mass $5 \mathrm{kg}$ is lying on a frictionless table. A force of $20 \mathrm{N}$ is applied on it for $10 \mathrm{seconds}$. Calculate its kinetic energy.

A man of mass $60 \mathrm{kg}$ runs up a flight of $30$steps in $40$seconds. If each step is $20 \mathrm{cm}$ high, calculate the power of the man.

A girl of mass $40 \mathrm{kg}$ climbs a rope $6 \mathrm{m}$long at constant speed in $15$seconds. What power does she expend during the climb.

Calculate the kinetic energy of a body of mass $50 \mathrm{kg}$ moving with a velocity of  $50 \mathrm{cm} {\mathrm{s}}^{-1}$.

Is any work done by a body moving along a circular path ?

A rowing boat upstream is at rest with respect to the shore. Is he doing work ?

You pay a coolie for carrying your luggage. Does he really do any work ?