Question

A cane filled with water is revolved in a vertical circle of radius 4 meter and the water just does not fall down. The time period of revolution will be

• A. 1 sec
• B. 10 sec
• C. 8 sec
• D. 4 sec

Answer 1

The correct option is D

4 sec

For critical condition at the highest point $\omega$ = $\sqrt{g/R}$
$\Rightarrow$T = $\frac{2\pi }{\omega }$ = 2$\pi$$\sqrt{R/g}$ = 2 $\times$3.14$\sqrt{4/9.8}$ = 4sec.