A point mass 'm' is moved in a vertical circle of radius 'r' with the help of a string. The velocity of the mass is √7 gr at the lowest point. The tension in the string at the lowest point is :

Question

A point mass 'm' is moved in a vertical circle of radius 'r' with the help of a string. The velocity of the mass is √7 gr at the lowest point. The tension in the string at the lowest point is : (A) 6 mg (B) 7 mg (C) 8 mg (D) 1 mg

Tardigrade Admin · Accepted Answer

<img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/0fdf403e006ff07e5d3d0a2e374093c0-.png" /> T-mg = (m(√7 gr)2/r) T=8 mg

Q. A point mass $^{'} m^{'}$ is moved in a vertical circle of radius $^{'} r^{'}$ with the help of a string. The velocity of the mass is $7 g r$ at the lowest point. The tension in the string at the lowest point is :

$6 m g$

$7 m g$

$8 m g$

$1 m g$

$T - m g = \frac{m ( 7 g r ) ^{2}}{r}$
$T = 8 m g$

Q. A point mass ′m′ is moved in a vertical circle of radius ′r′ with the help of a string. The velocity of the mass is 7gr​ at the lowest point. The tension in the string at the lowest point is :

6mg

7mg

8mg

1mg