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Question

Find magnitude of force exerted by string on the pulley.
301482_33f45304225f4820b937ef0fa2b9ebac.png


A
100 N
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B
1002 N
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C
200 N
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D
100 N
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Solution

The correct option is C $$100 \sqrt 2\ N$$
F.E.D. if 10 kg block:
T = 10 g = 100 N
F.B.D. of pulley :
Since is mass less, so tension both sides of string is same.
Force exerted by string then is
= $$\sqrt{(100)^2\,+\, (100)^2}\,=\, 100\sqrt{2}\, N$$

276218_301482_ans_3658f5bc43c14fe4b2bdd469f36f7925.png

Physics

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