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# A flywheel coming to rest.

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Annular steel rotating flywheel 500mm diameter and 60mm wide is supported on a steel shaft 100mm diameter and 100mm long rotates at 2000 rpm. If the shaft bearings induce a frictional torque equivalent to 40Nm, how long will it for the flywheel to come to rest if the density of the steel is 7850kg/m3.

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Annular steel rotating flywheel 500mm diameter and 60mm wide is supported on a steel shaft 100mm diameter and 100mm long rotates at 2000 rpm. If the shaft bearings induce a frictional torque equivalent to 40Nm, how long will it for the flywheel to come to rest if the density of the steel is 7850kg/m3.

Diameter of the fly wheel= df= 500mm= 0.5m
Length of the flywheel = lf= 60mm= 0.06m
Volume of the flywheel = vf = ...

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