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Question

A mass is supported on a frictionless horizontal surface. It is attached to a string and rotates fixed center at an angular velocityωo If the length of the string and angular velocity are douted tension in the string which was initially To is now,

A
To
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B
To/2
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C
4To
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D
8To
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Solution

The correct option is B 8To
Tension in the string T0=mRω20
In the second case T=m(2R)(4ω20)=8mRω20=8T0
Hence,
option (D) is correct answer.

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