Question

A can filled with water is revolved in a vertical circle of radius 4m 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

Answer: (D)

4 sec

Answer 2

At highest point $mg = m\omega^{2}r \Rightarrow g = \frac{4\pi^{2}}{T^{2}}r$

$\Rightarrow 10 = \frac{4\pi^{2}4}{T^{2}}$ $\Rightarrow$ $T^{2} = 16$ ∴$T = 4sec$