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A fly -wheel of mass 25 kg has a radius of $0.2\;m$. It is making 240 rpm. What is the torque necessary to bring to rest in 20 sec?

\[\begin {array} {1 1} (1)\;2 \pi\; Nm & \quad (2)\;0.2\; \pi Nm \\ (3)\;\frac{2}{\pi}\;Nm & \quad (4)\;4 \pi\; Nm \end {array}\]

1 Answer

(2) $0.2 \pi Nm$
answered Nov 7, 2013 by pady_1
 

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