Dr. S K Jain and Dr. Shailesh K Jain Solutions for Chapter: Work, Energy and Power, Exercise 5: EXAM PRACTICE QUESTIONS

A light and heavy body have equal kinetic energies. Which has larger momentum?

Derive the relationship $KE=\frac{1}{2}m{v}^2$ where $m$ is the mass and $v$ is the velocity of the body.

Prove that the energy remains constant in the case of freely falling bodies.

What kind of energy transformation takes place in a simple pendulum when it completes one oscillation?

What is meant by energy transformation? What kind of energy transformation takes place during power generation in a thermal power station?

A person of mass $50 \mathrm{kg}$ climbs a tower whose height is $50 \mathrm{cm}$. Calculate the amount of work done by the person. $g=10 \mathrm{m} {\mathrm{s}}^{-2}$

What is the work done by a man weighing $60 \mathrm{kg}$ and carrying a box $20 \mathrm{kg}$ on his head and travelling a distance of $10 \mathrm{m}$ in the vertical direction? $\left(g=9.8 \mathrm{m} {\mathrm{s}}^{-2}\right)$

What is the work done by a man weighing $60 \mathrm{kg}$ and carrying a box $20 \mathrm{kg}$ on his head and travelling a distance of $10 \mathrm{m}$ on the horizontal ground which is frictionless? ($g=9.8 \mathrm{m} {\mathrm{s}}^{-2}$)