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When is a rigid body said to be in equil...

When is a rigid body said to be in equilibrium ? State the necessary conditions for a body to be in equilibrium.

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For translation equilibrium
`sum vecF_(ext)=0`
`alpha` in cylinder `alpha_(C) = tau/(I)`
`alpha` in sphere `alpha_(S) = tau/I`
`alpha_(C)/alpha_(S) =I_(S)/I_(C) = (2/5 MR^(2))/(MR^(2)) -2/5`
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