Question

A mass $m$ attached to a thin wire is whirled in a vertical circle with a constant speed. The wire is most likely to break when

• A. the mass is at the highest point.
• B. the wire is horizontal.
• C. the mass is at the lowest point.
• D. inclined at an angle of $60°$ from vertical.

Answer 1

The correct option is C the mass is at the lowest point.

$T-mg\cos \theta =\frac{m{v}^2}{r}$


$T$ will be maximum when $\theta =0°$
i.e when the mass is at the lowest point.