Question

In a rotor, a hollow vertical cylindrical structure rotates about its axis and a person rests against the inner wall. At a particular speed of the rotor, the floor below the person is removed and the person hangs resting against the wall without any floor. If the radius of the rotor is 2 m and the coefficient of static friction between the wall and the person is 0.2, find the minimum speed at which the floor may be removed. ( Take g =10 $m/s^2$)

• A. 7.2 m/s
• B. 10m/s
• C. 5.5 m/s
• D. 4.4m/s

Answer 1

The correct option is B 10m/s

$V=\sqrt{\frac{Rg}{\mu }}=\sqrt{\frac{20}{0.2}}=10m/s$