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a disc is rotating with angular velocity 100r/s and moment of inertia 2kgm^2 .another identical disc rotating in opposite direction is placed coaxially.they continue to rotate.what is loss in kinetic energy?

a disc is rotating with angular velocity 100r/s and moment of inertia 2kgm^2 .another identical disc rotating in opposite direction is placed coaxially.they continue to rotate.what is loss in kinetic energy?

Grade:11

1 Answers

Robin
19 Points
5 years ago
  • First, we will apply conservation of Angular momentum so that we can find Final Angular velocity.
  • Initial angular momentum=Final angular momentum
  • I1W1  + I2W 2 = IfinalWfinal 
  • 2×100  + 2×0   =   ( 2+2 ) × Wfinal
  • Wfinal  =  50  rad/ sec
 
 
  • Change in K.E =  ½ × ( I1 × I2 ) ÷ ( I1 + I2 )  × ( Winitial− WFinal )
  • Put the values and get the answer.
  • If you don’t get the answer please let me know.
  • Have Fun
 
 
 

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