A car is designed to get its energy from a rotating flywheel with a radius of 1.12 m and
a mass of 736 kg. Before a trip, the flywheel is attached to an electric motor, which
brings the flywheel’s rotational speed up to 7270 rev/min.
Find the kinetic energy stored in the fly-wheel.
Answer in units of J.
KE = 0.5*Inertia*w^2
Inertia = m*r^2
The Attempt at a Solution
convert 7270 rev/min to rad/s = 761.314 rad/s
KE equation: 0.5*(761.314)^2*(736 kg)*(1.12m)^2 = 267554029.7
answer is apparently wrong... help please?
PART 2, I don't think I can do this without a correct answer from part 1
If the flywheel is to supply energy to the car as would a 11.8 hp motor, how long could the
car run before the flywheel would have to be brought back up to speed?
Answer in units of h.