I have a 10 foot dia x 3 foot thick solid flywheel that weighs approx 20,000 lbs.

It is rotating at about 2 rpm I have a electric brake that is rated to apply 9500 in-lb of torque.

How long (sec) or how many rads will it take to stop?

If possible please show math, the diameter, mass and speed can vary.

Thanks,

dpjkw