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zahid sharief Grade: 11
        

please tell me how to solve this one


two personsare holding a massless ropetightly at its ends so that it is horizontal. a 15 kg weight is attached at its midpt which now no longer horizontal. the min tension required to completely straighten the rope is-(ans-infinite)

7 years ago

Answers : (1)

Puneet Mittal AskiitiansExpert-IITD
22 Points
										

Hi Zahid,


Let alpha be the angle which the rope is making with the vertical when weight is attached at its mid-point.


let the tension in the rope be T.


The 2Tcos(alpha) = mg ( by using Force balance in vertical direction for the weight )


 T = mg/(2*cos(alpha))


Now when the rope is straight then , alpha is 90 degrees.


cos(alpha) = cos(90 degree) = 0


T = mg/( 0 ) = Infinite


Please feel free to ask as many questions you have.


Puneet

7 years ago
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