Questions
A small sphere A of mass m is tied to one end of a string of length . The other end of the string is attached to a fixed part O. The sphere is released from rest with the string horizontal. Then the tension in the string when it is vertical is
detailed solution
Correct option is B
When the string is vertical, conserving energy we get, 12mv2=mgl⇒mv2l=2mgNet radially inward force on the sphere = Tmax-mgTmax-mg=mv2l⇒Tmax=mg+2mg=3mgTalk to our academic expert!
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A pendulum of length / = l m is released from . The rate of change of speed of the bob at is (g = 10 )
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