Kinematics Question 555

Question: A stone of mass M is tied to a string and it’s moved in a vertical circle of radius r making n revolutions per minute.The total tension in the string when the stone is at it’s lowest point is [Kerala (Engg.) 2001]

Options:

A) mg

B)m(g+πnr2)

C) m(g+πnr)

D)mg+(π2n2r)/900

Show Answer

Answer:

Correct Answer: D

Solution:

T=mg+mω2r=mg+4π2n2r

=mg+(4π2(n60)2r)=mg+(π2n2r900)



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