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A circular disk of moment of inertia I t is rotating ina horizontal plane - its symmetry axis - with a constantangular speed ωiAnother disk of moment of inertia I b isdropped coaxially onto the rotating diskInitially thesecond disk has zero angular speedEventually both thedisks rotate with a constant angular speed ω fTheenergy lost by the initially rotating disk to friction is:[2010]

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A circular disk of moment of inertia I t is rotating ina horizontal plane - its symmetry axis - with a constantangular speed ωiAnother disk of moment of inertia I b isdropped coaxially onto the rotating diskInitially thesecond disk has zero angular speedEventually both thedisks rotate with a constant angular speed ω fTheenergy lost by the initially rotating disk to friction is:[2010]





 
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