A) \[\sqrt{rg}\]
B) \[\sqrt{3\,rg}\]
C) \[\sqrt{5\,rg}\]
D) \[\sqrt{6\,rg}\]
Correct Answer: A
Solution :
Consider the diagram At the height point P of the circle \[T+mg=\frac{m{{v}^{2}}}{r}\] For bob, to just complete the vertical circle, tension should be equal to zero \[\Rightarrow \] \[\frac{m{{v}^{2}}}{r}=mg\]where, m = mass of the bob. \[\Rightarrow \] \[v=\sqrt{rg}\] This is minimum velocity of bob at point P to just complete the vertical circle.You need to login to perform this action.
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