Kinematics Question 798

Question: A mass is supported on a frictionless horizontal surface. is attached to a string and rotates about a fixed centre at an angular velocity ω0 . If the length of the string and angular velocity are doubled, the tension in the string which was initially T0 it’s now [AIIMS 1985]

Options:

A) T0

B) T0/2

C) 4T0

D) 8T0

Show Answer

Answer:

Correct Answer: D

Solution:

Tension in the string T0=mRω02

In the second caseT=m(2R)(4ω02)=8mRω02

=8T0



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