Question

A body of mass $10kg$ is rotated in vertical circle of radius $4cm$ at constant angular velocity of $5rad/sec.$ The maximum tension in the string is -

• A. $100N$
• B. $600N$
• C. $110N$
• D. $1100N$

Answer 1

The correct option is C $110N$

Max tension in the string when string at the bottom of the vertical ciecle in which both centrifugal ang gravitational force is acting in the same direction as shown in the fiqure

$T=m{w}^{2}r+mg=10\times 5^2\times 0.04+10\times 10=10+100=110N$

Hence the correct option is c