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Grade: 12
        A wire elongates by l mm when a load W is hanged from it.If the wire goes over a pulley and two weights W each are hung at the two ends,the elongation of the wire will be(in mm)
6 years ago

Answers : (1)

Vasantha Kumari
askIITians Faculty
38 Points
							

We know that the Young’s modulus Y = Force x L / A x l

Or rewriting we have Y = WL/Al

\ l= WL/ AY

Since the length of the wire is on both sides of the pulley length L/2 will be on both sides.

Thus the elongation of the wire in mm is l mm.

Thanks & Regards,

Vasantha Sivaraj,

askIITians faculty

181-362_Youngs mod.JPG
6 years ago
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