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Periodic Motion

Find magnitud...

Question

Find magnitude of force exerted by string on the pulley.

100 N

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100 \sqrt{2} N

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200 N

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\sqrt{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
= $\sqrt{(100)^{2} + (100)^{2}} = 100 \sqrt{2} N$

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