Kinematics Question 732

Question: Two masses M and m are attached to a vertical axis by weightless threads of combined length l . They are set in rotational motion in a horizontal plane about this axis with constant angular velocity ω . If the tensions in the threads are the same during motion, the distance of M from the axis it’s [MP PET 1995]

Options:

A) MlM+m

B)mlM+m

C) M+mMl

D)M+mml

Show Answer

Answer:

Correct Answer: B

Solution:

If the both mass are revolving about the axis yy’ and tension in both the threads are equal then

Mω2x=mω2(lx)

therefore Mx=m(lx)

therefore x=mlM+m



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