MCQ
forceA particle moves with constant speed $v$ along a circular path of radius $r$ and completes the circle in time $T$. The acceleration of the particle is
- ✓$2\,\pi \,v/T$
- B$2\,\pi \,r/T$
- C$2\,\pi \,{r^2}/T$
- D$2\,\pi \,{v^2}/T$
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$A$. The motion of the gas molecules freezes at $0^{\circ} C$
$B$. The mean free path of gas molecules decreases if the density of molecules is increased.
$C$. The mean free path of gas molecules increases if temperature is increased keeping pressure constant.
$D$. Average kinetic energy per molecule per degree of freedom is $\frac{3}{2} k_{B} T$ (for monoatomic gases)
Choose the most appropriate answer from the options given below

The relative velocity $\overrightarrow {{V_A}} - \overrightarrow {{V_B}} $ at $t = \frac{\pi }{{2\omega }}$ is given by
