Embibe Experts Solutions for Exercise 1: ICSE-2020

State the energy changes in the case of an electric iron while in use.

State the energy changes in the case of a ceiling fan while in use.

Derive a relationship between SI and CGS units of work.

Define a kilowatt-hour. How is it related to joule?

A force acts on a body and displaces it by a distance $S$ in a direction at an angle $\theta$ with the direction of force. What should be the value of $\theta$ to get the maximum positive work?

A satellite revolves around a planet in a circular orbit. What is the work done by the satellite at any instant? Give a reason.

A crane $\text{'}A\text{'}$ lifts a heavy load in $5 \mathrm{seconds}$, whereas another crane $\text{'}B\text{'}$ does the same work in $2 \mathrm{seconds}$. Compare the power of crane $\text{'}A\text{'}$ to that of crane $\text{'}B\text{'}$.

Name the SI unit of physical quantity obtained by the formula $\frac{2K}{v^2}$.
Where, $K$ is kinetic energy and $v$ is linear velocity.