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Q.

A load of mass 1kg suspended from a string of length 1m, area of cross section 10 cm2 and Young’s modulus 50 GPa. The load is made to describe a horizontal circle of radius 60 cm with the string fixed at the top end. The extension in the string in μm  is

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a

2.8 

b

0.25

c

0.028

d

2.5

answer is A.

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Detailed Solution

Question Image

 

 

 

 

 

 

 

 

 

 

Tcosθ=mg

T0.81=10⇒T=1008=12.5N

Δl=TlYA=12.5×150×109×10−3m=0.25μm

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