A liquid is kept in a cylindrical vessel which is rotated along its axis. The liquid rises at the side. If the radius of the vessel is `5 cm` and the speed of rotation is `4 rev//s`, then the difference in the height of the liquid at the centre of the vessel and its sides is

Options

A. 8 cm
B. 2 cm
C. 40 cm
D. 4 cm

Answer

A

Explanation

` y = (w ^ 2 x ^ 2 ) /( 2 g ) ` (from module ), R = 5 cm w = ` 2pi ` (0.4 ) rad/sec ` rArr ` y = 8 cm