Kinematics Question 532

Question: A block of mass m at the end of a string is whirled round in a vertical circle of radius R . The critical speed of the block at the top of it’s swing below which the string would slacken before the block reaches the top it’s [DCE 1999, 2001]

Options:

A) Rg

B) (Rg)2

C) R/g

D) Rg

Show Answer

Answer:

Correct Answer: D

Solution:

At highest point mv2R=mg

therefore v=gR

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