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

Answer: (D)

4 sec

Answer 2

For critical condition at the highest point

⇒ $T = \frac { 2 \pi } { \omega } = 2 \pi \sqrt { R / g } = 2 \times 3.14 \sqrt { 4 / 9.8 }$ = 4 sec.