Physics Problem, Please Help ME?

A typical wind turbine in the The Farm generates 1 MW when the wind is blowing. During calm periods, however, no power is generated. Thus, to ensure a steady supply of power a mechanism must be created by which the energy generated by the turbine can be easily stored and retrieved. One option is to use batteries, but another and perhaps simpler approach would be to store the energy in a spinning flywheel. One percent of a day’s maximum output from the turbine would correspond to 860 MJ of energy. With what angular speed (in rad/s) would a 5000 kg flywheel with a radius of 4 m spin in order to store 860 MJ of energy? You can model the flywheel as a uniform disk.