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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
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B
152 kg
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C
5 kg
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D
Infinitely large (or not possible)
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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 horizontal
So $$2Tsin\theta =15g$$,
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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