Question

A 2.2kg mass is whirled in a vertical circle of radius 1.8m at a uniform constant speed. calculate this speed if the minimum tension in the rope is 9.5N.

Answer 1

$mg+N=m\frac{v^2}{r}\to$

$v=\sqrt{\frac{(N+mg)r}{m}}=\sqrt{\frac{(9.5+2.2\cdot 9.8)\cdot1.8}{2.2}}=5(m/s)$ . Answer