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Q.

A string of length 1m is fixed at one end and carries a mass of 100 g at the other end. The string makes (2/π) revolutions per second around vertical axis through the fixed end. What is the tension in the string ?
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a

3.2 N

b

1.6 N

c

2.4 N

d

0.8 N

answer is A.

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Detailed Solution

mg=Tcosθ.........(1)

mRω2=Tsinθ..........(2)

here R=Lsinθ

Thus,

T=mLω2=0.1×1×42=1.6N

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