A object of mass $4 \; kg$ is whirled round a vertical circle of radius $1 \; m$ with a constant speed of $3 \; m/s$. Calculate the maximum tension in the string.

Given,

Mass of the object $(m) = 4\;kg$

Radius of the object $(r) = 1\;m$

Speed of the object $(v) = 3\;m/s$

Maximum tension $(T_{max}) = \;?$

We have,

$T_{max} = \frac{m\;v^2}{r} + m\;g = \frac{4 \; * \; 3^2}{1} + 4\;*\;10 = 76\;N$

Maximum tension $(T_{max}) = \;76\;N$

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