Physics Two Dimensional Motion Question 79
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 its swing below which the string would slacken before the block reaches the top is
[DCE 1999, 2001]
Options:
A) $ Rg $ B) $ {{(Rg)}^{2}} $ C) $ R/g $ D) $ \sqrt{Rg} $
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Answer:
Correct Answer: D
Solution:
At highest point $ \frac{mv^{2}}{R}=mg $
Therefore $ v=\sqrt{gR} $
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