Physics
posted by John .
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 
Elena
units???

Physics 
Amanda
To start off, I will assume that 290 and 230 are in terms of rpm.
Pave=(KfKi)/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.
KfKi= (1/2)*(1/2*m*r^2)*(Wf^2Wi^2)
Divide KfKi by t and you will get average power.
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