A particle moves in a circle of radius $5$ cm with constant speed and time period $0.2\pi$ s. The acceleration of the particle is:

Two particles having mass $M$ and $m$ are moving in a circular path having radius $R$ & $r$ respectively. If their time periods are the same, then the ratio of angular velocities will be: 
1. $\dfrac{r}{R}$
 2. $\dfrac{R}{r}$
3. $1$
4. $\sqrt{\dfrac{R}{r}}$

For a particle performing uniform circular motion,

Choose the correct statement/s:

An insect trapped in a circular groove of radius $12~\text{cm}$ moves along the groove steadily and completes $7$ revolutions in $100~\text{s}.$ What is the angular speed of the motion?