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Q.

A block of weight W is suspended from the mid-point of a rope whose ends are at the same horizontal level. The force required to straighten the rope is

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a

2W

b

W

c

infinitely large

d

W/2

answer is D.

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Detailed Solution

Question Image

 For equilibrium of body, mg=2 Tcosθ

⇒T=mg2cosθ

For string to be horizontal,

θ⟶90°

⇒T=mg2cosθ→∞

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