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A uniform rod of mass 15 kg is held stationary with the help of a light string as shown in figure. Length of rod is 5 m, and it makes 37⁰ from ground. The tension in the string is

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225 N

None of the above

150 N

100 N

answer is C.

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Detailed 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, $T \times 3 - 15 g \times 2 = 0$
$\Rightarrow T = 100 N$
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