Lakhmir Singh and Manjit Kaur Solutions for Chapter: Work and Energy, Exercise 17: Short Answer Type Questions

Write the energy transformations which take place in an electric bulb (or electric lamp).

Name five appliances or machines which use an electric motor.

State the energy change in the battery, when it is connected to an electric bulb.

State the energy change that takes place in the bulb which lights up when connected to a battery

The hanging bob of a simple pendulum is displaced to one extreme position $B$ and then released. It swings towards centre position $A$ and then to the other extreme position $C$. In which position does the bob have: Maximum potential energy? Give reasons to your answer.

The hanging bob of a simple pendulum is displaced to one extreme position $B$ and then released. It swings towards center position $A$ and then to the other extreme position $C$. In which position does the bob have: Maximum kinetic energy? Give reasons for your answer.

A car of weight $20000\mathrm{}\mathrm{N}$ climbs up a hill at a steady speed of $8 \mathrm{m}/\mathrm{s}$, gaining a height of $120 \mathrm{m}$ in $100 \mathrm{s}$. Calculate work done by the car.

A car of weight $20000 \mathrm{N}$ climbs up a hill at a steady speed of $8 \mathrm{m}/\mathrm{s}$, gaining a height of $120 \mathrm{m}$ in $100 \mathrm{s}$. Calculate power of engine of the car.