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Question

A mass of 2 kg is whirled in a horizontal circle by means of a string at an initial speed of 5 revolutions per minute. Keeping the radius constant the tension in the string is doubled. The new speed is nearly



Your Answer
A

14 rpm

Your Answer
B

10 rpm

Your Answer
C

2.25 rpm

Correct Answer
D

7 rpm


Solution

The correct option is C

7 rpm


Tension in the string T=mω2r=4π2 n2 mr
 Tn2 n2n1=T2T1n2=52TT=7 rpm

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