We where given a problem in class yesterday (sort of a keep you thinking while out of class, not worth any marks, but just a fun challenge).

The teacher asked us to calculate the theoretical energy (in watts) of a given flywheel,

these are the specs,

I = Moment of enertial

W = Rotational velocity (RPM) = 6000 (RPM)

I = k*M*(R*R) = 5

k=Inertial constant = 0.8

M= Mass = 25KG

R= Radious= 0.5m

the formula is quite simple

Kenetic Energy = 1/2 * I * (W*W)

so once you plug in the numbers you get

Kenetic Energy = 90 000 000

I'd love to convert this to watts but I have no clue what the unit for that 90 million is.

please help me.

Thanks Tony