What is circular motion? Explain.

What is an artificial satellite? Name any two types of artificial satellite and state their functions.

In hydrogen atom, the electron is moving round the nucleus with velocity $2.18\times {10}^6 \mathrm{m}{\mathrm{s}}^{-1}$ in an orbit of radius $0.528 \mathrm{Å}$. The acceleration of the electron is

Is a satellite moving around the Earth in a circular orbit accelerated? Explain.

A $500\mathrm{ }\mathrm{k}\mathrm{g}$ car takes a round turn of radius $50\mathrm{ }\mathrm{m}$ with a velocity of $36\mathrm{ }\mathrm{k}\mathrm{m}/\mathrm{h}\mathrm{r}$ . The centripetal force is-

Name a physical quantity which (i) varies (ii) remains constant when a body moves in a uniform circular motion.

The earth revolves around the sun in an orbit of radius $1.5\times {10}^{11} \mathrm{m}$ once in a year. Calculate the centripetal acceleration of the earth.

Identify the kind of motion in the following cases:  
$\left(i\right)$ A car moving with constant speed turning around a curve.
$\left(ii\right)$ An electron orbiting around a nucleus.

What do you mean by uniform circular motion?