Calculations for Energy Stored in My Flywheel

The formula that I am using is:

Energy of the Flywheel= 1/2*Moment of Inertia*angular velocity^2

To find the moment of inertia, I need to use the formula

kmr^2 (inertial constant* mass of flywheel* radius squared),

which is the moment of inertia for a rotating disk. The inertial constant of a flat solid disk is about .606. The mass of the flywheel is about 2.5lbs, which converts to about 1.13kg. The radius of the disk is 2.5 inches, which converts to about .064m. Putting this back into the moment of inertia formula, we find that the moment of inertia for my flywheel is about .0028.
To find the angular velocity, I need to convert the RPM, or Revolutions Per Minute, into radians per second, the basic unit for angular velocity. The rough conversion from RPM to radians/sec is about 1 rad/s is equal to 9.55 RPM, which means that 6000 RPM, the max RPM I was able to get my flywheel up to in the vacuum chamber, is equal to about 628.3 rad/s.
Plugging this back into the formula, I can find that the theoretical Energy of my Flywheel is about 552.67 Joules of energy at top speed. However, this number in my actual experiment is a lot lower, since there was a lot of energy that was lost from friction on the glass, which caused some heat, as well as the heat from the coils generated from the Eddy Currents.

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