Find mass of uniform solid disk?

  • Thread starter saturn67
  • Start date
  • #1
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you need to design an industrial turntable that is 48.0 cm in diameter and has a kinetic energy of 0.300 J when turning at 31.0 rpm

i found that inertia of the turntable about the rotation axis
is = 5.71×10^-2 kg m^2

If your workshop makes this turntable in the shape of a uniform solid disk, what must be its mass?

it try to use I=mr^2
so mass = I/r^2

but that don't work
 

Answers and Replies

  • #3
54
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Woot it work thank you
 

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