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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 -

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 -

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2 Answers

Susmita
425 Points
5 years ago
To keep it horizontal tensional force must be equal to the applied force 15kg weight= 15g=15×10 N=150 N.(Taking g=10m/s2 approx)
 
 
Susmita
425 Points
5 years ago
All right.So when it is not horizontal,let it make an angle A with the horizontal.At this point Horizontal component of  T or TcosA will cancel out.Vertical component
2TsinA=mg=15g
But for the wire to be horizontal A must be zero.
SinA=0.
T=15g/2sinA=15g/0=infinity.
Hope this helps.

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