You are considering buying a hybrid car, but are skeptical of the manufacturer's claims. One model uses a ring-shaped flywheel to store energy. Supposedly it can store 10 MJ of energy and supply 25 kW of power for about 400 seconds. You find these data on the flywheel: mass 48 kg, rotation speed of 30,000 rpm, and diameter of 41.1 cm. Are these specs correct?