A stone of mass \( m \) is tied to a string and is moved in a verti... VIDEO
A stone of mass \( m \) is tied to a string and is moved in a vertical circle of radius \( r \) making \( n \) revolutions per
\( \mathrm{P} \)
minute. The total tension in the string when the
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stone is at its lowest point is
(1) \( m g \)
(2) \( m\left(g+\pi n r^{2}\right) \)
(3) \( m(g+\pi n r) \)
(4) \( m\left\{g+\left(\pi^{2} n^{2} r\right) / 900\right\} \)
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