Question

A block of mass $10 kg$ is in contact against the inner wall of a hollow cylindrical drum of radius $1 m.$ The coefficient of friction between the block and the inner wall of the cylinder is $0.1$. The minimum angular velocity needed for the cylinder to keep the block stationary when the cylinder is vertical and rotating about its axis, will be: ($g=10 \frac{m}{s^2}$

• A. $\sqrt10\ rad/s$
• B. $\frac{10}{2\pi}\ rad/s$
• C. $10\ rad/s$
• D. $10\pi\ rad/s$

Answer 1

Answer: (C)

$10\ rad/s$

Answer 2

The correct option is (C) :$10\ rad/s$