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  4. A uniform rod of mass 15 kg is held stationary with the help of a light string as shown in the figure. The tension in the string is

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Q. A uniform rod of mass $15 \,kg$ is held stationary with the help of a light string as shown in the figure. The tension in the string isPhysics Question Image

System of Particles and Rotational Motion

Solution:

The free-body diagram of the rod is shown in the figure.
(Force exerted by the hinge on the rod are not shown.)
Take torque about the hinge,
$ T \times 3-15 g \times 2=0$
$\Rightarrow T=100 N$

Solution Image