Motion in A Plane

Question: A stone of mass m is tied to a string and is moved in a vertical circle of radius r making n revolutions per minute. The total tension in the string when the stone is at its lowest point is

1) mg

2) \[m(g + \pi \,n\,{r^2})\]

3) \[m(g + \pi \,n\,r)\]

4) \[m\{ g + ({\pi ^2}\,{n^2}\,r)/900\} \]

Solution:

Explanation: Explanation

Non-uniform-circular-motion

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