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Pure Rotation about an Axis

The horizonta...

Question

The horizontal beam in figure weights $150 N$ , and its centre of gravity is at its centre. Find the tension in the cable.

A

75 N

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B

500 N

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C

300 N

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D

625 N

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Solution

The correct option is D $625 N$
$T a k i n g t o r q u e a b o u t t h e h i n g e M g \times 4 + m g \times 2 = T s i n 37^{0} \times 4 \Rightarrow 300 \times 4 + 150 \times 2 = T \frac{3}{5} \times 4 \Rightarrow T = \frac{5}{12} \times 1500 = 625 N$

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