Manipur Board Solutions for Chapter: Work, Energy and Power, Exercise 3: EXERCISES

Tomba does $200 \mathrm{J}$ of work in $10$ seconds and his brother Pishak does $100 \mathrm{J}$ of work in $4$ seconds. Who is delivering more power?

Tomba does $200 \mathrm{J}$ of work in $10$ seconds and his brother Pishak does $100 \mathrm{J}$ of work in $4$ seconds. Find the ratio of the powers of Tomba to that of Pishak.

Read the situation given below carefully and reason out whether work is done or not in the light of scientific term of work.
Kamala is swimming in a pond along a straight path.

Read the situation given below carefully and reason out whether work is done or not in the light of scientific term of work.
Tomba is standing with a load having the same weight as his weight on his head.

Read the situation given below carefully and reason out whether work is done or not in the light of scientific term of work.
Chaoba pushes a huge rock with all his strength, but the rock does not move.

Read the situation given below carefully and reason out whether work is done or not in the light of scientific term of work.
A horse is carrying a load on its back and moves on a horizontal surface.

A stone of mass $2 \mathrm{kg}$ falls from a height of $1 \mathrm{m}$. Its kinetic energy when it reaches the ground is -
(Take $g=9.8 \mathrm{m} {\mathrm{s}}^{-2}$).

Two bodies of unequal masses are dropped from a certain height above the ground. At any point of their path, they have equal -