Question

A particle of mass m is attached with a string and it is rotated in a vertical circle, the tension at lowest point of the string will:

• A. $\frac{{mv}^2}{r}$
• B. $\frac{{mv}^2}{r}-mg$
• C. $\frac{{mv}^2}{r}+mg$
• D. $mg$

Answer 1

The correct option is C $\frac{{mv}^2}{r}+mg$

The correct option is C.

Given,

A particle of mass $m$

So, the tension in the string is:

$(T-mg)=\frac{m{v}^2}{r}$

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