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Grade: 11
        
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?
3 months ago

Answers : (1)

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

  • 110 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


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