Question

# Two persons are holding a light rope tightly at its ends so that it is horizontal. A 15 kg weight is attached to the rope at the mid point which now no longer remains horizontal. The minimum tension required to completely straighten the rope is

A
45 kg
B
152 kg
C
5 kg
D
Infinitely large (or not possible)

Solution

## The correct option is D Infinitely large (or not possible)Since the weight is attached to rope at the center,Thee rope won't be in horizontal anymore ,lets say it make angle $$\theta$$ with horizontalSo $$2Tsin\theta =15g$$,To keep rope horizontal $$\theta$$ should be 0 , So tension must be infinitely large ,so that their product is =15g (practically this is not possible)Physics

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