Physics

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The wheel is attached to an electric generator and the rotation rate drops from 290 to 230 in 3.5 . What is the average power output?

  • Physics -

    units???

  • Physics -

    To start off, I will assume that 290 and 230 are in terms of rpm.

    Pave=(Kf-Ki)/t

    t=3.2

    K=1/2*I(inertia)*w(omega)^2

    Inertia of disc= 1/2*m*r^2

    W must be in terms of rad/s, so multiply each rpm term by 2pi/30.

    Kf-Ki= (1/2)*(1/2*m*r^2)*(Wf^2-Wi^2)

    Divide Kf-Ki by t and you will get average power.

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