Question

A ball of mass `0.6 kg` attached to a light inextensible string rotates in a vertical circle of radius `0.75 m` such that it has speed of `5 ms^(-1)` when the string is horizontal. Tension in the string when it is horizontal on other side is `(g = 10 ms^(-2))`.
A. 30 N
B. 26 N
C. 20 N
D. 6 N

Answer 1

Correct Answer - C
`T=(mv_(H)^(2))/(r)` where `v_(H) = sqrt(3gr)`.