Question 228: Centre of Mass and Rotational Motion

Question

Shown in the figure is rigid and uniform one
meter long rod AB held in horizontal position by
two strings tied to its ends and attached to the
ceiling. The rod is of mass ‘m’ and has another
weight of mass 2 m hung at a distance of 75 cm
from A. The tension in the string at A is :
![](https://imagex.cdn.examgoal.net/jgy2xukev0rvfi/e23c592e-1654-4942-9b75-16d6af6cd7bc/2ee14fe0-f268-11ea-8293-3b6cc591631c/file-jgy2xukev0rvfj-389w.png)

Accepted Answer

$	au $
B
= 0 (torque about point B is zero)
(T
A
) ÃÂ 100 Ã¢ÂÂ (mg) ÃÂ 50 Ã¢ÂÂ (2mg) ÃÂ 25 = 0
$ \Rightarrow $ 100T
A
= 100 mg
$ \Rightarrow $ T
A
= 1 mg
![](https://imagex.cdn.examgoal.net/1ki3dhkgq/c6c3f53e-970d-49a5-affa-e2c176d0ad24/d25423a0-3264-11eb-bf8e-9bdae134a25b/file-1ki3dhkgr-860w.jpeg)

Answer

0.5 mg

Answer

2 mg

Answer

0.75 mg

Answer

1 mg

Centre of Mass and Rotational Motion

Shown in the figure is rigid and uniform one meter long rod AB held in horizontal position by two strings tied to its ends and attached to the ceiling. The rod is of mass ‘m’ and has another weight of mass 2 m hung at a distance of 75 cm from A. The tension in the string at A is :

Choose the correct answer: