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Physics - Circular Motion Question with Solution | TestHub

PhysicsCircular MotionDynamicsMedium2 minPYQ_2020
PhysicsMediumsingle choice

A particle of massmis fixed to one end of a light spring having force constantkand unstretched lengthl.The other end is fixed. The system is given an angular speedωabout the fixed end of the spring such that it rotates in a circle in gravity free space. Then the stretch in the spring is:

Question diagram: A particle of mass m is fixed to one end of a light spring h

Options:

Answer:
B
Solution:

As we know, the spring force will give the necessary centripetal force for rotation.

So, 

mω2l+x=kx
lx+1=kmω2

 Thus, the stretch in the spring
x=lmω2k-mω2

Stream:JEESubject:PhysicsTopic:Circular MotionSubtopic:Dynamics
2mℹ️ Source: PYQ_2020

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