Question

An energy storage flywheel is constructed of a hub and spokes that are connected to a massive outer ring, for calculation purposes, the hub and spokes may be neglected. The outer ring is made of steel (mass density = 8000 kg/m^3) has an ID of 2300 mm, an OD of 2780 mm, and is 105 mm wide. The flywheel is rotating at 5600 RPM when a 310 kW load is applied. How long will it take before the speed is reduced by 5%?

Answer 1