storage system based on a flywheel?

Question

An energy storage system based on a flywheel (a rotating disk) can store a maximum of 3.1 MJ when the flywheel is rotating at 2.0×104 revolutions per minute.

What is the moment of inertia of the flywheel?

Answer 1

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E = (1/2)Iω^2

ω = 2πf = 2π*2.0*10^4/60 = 2.094*10^3 rad/s

I = 2E/ω^2 = 2*3.1*10^6/(2.094^2*10^6)

Ι = 1.4 kg*m^2

• JOHN

  Lv 7

  5 months agoReport

  Looks Ok to me.
  

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