Q.

Two persons are holding a rope of negligible weight tightly at its ends so that it is horizontal. A 15 kg weight is attached to rope at the midpoint which now no more remains horizontal. The minimum tension required to completely straighten the rope is

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a

150 N

b

75 N

c

50 N

d

Infinitely large

answer is D.

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Detailed Solution

T=F,2Tcos⁡θ=mgTo make rope straight, θ=90∘
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Two persons are holding a rope of negligible weight tightly at its ends so that it is horizontal. A 15 kg weight is attached to rope at the midpoint which now no more remains horizontal. The minimum tension required to completely straighten the rope is