Posted by **Anonymous** on Wednesday, March 17, 2010 at 4:18pm.

A car is designed to get its energy from a rotating flywheel with a radius of 1.50 m and a mass of 600 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 4000 rev/min.

(a) Find the kinetic energy stored in the flywheel.

(b) If the flywheel is to supply energy to the car as would a 15.0 hp motor, find the length of time the car could run before the flywheel would have to be brought back up to speed.

- Physics Rotaional Kinetic Energy -
**bobpursley**, Wednesday, March 17, 2010 at 4:24pm
Model the flywheel as a sold disk, look up the moment of inertial

KE= 1/2 I w^2 where w=4000^2PI/60 rad/sec

change 15hp to kwatts

time= power/KEabove

- Physics Rotaional Kinetic Energy -
**Anonymous**, Wednesday, March 17, 2010 at 5:22pm
Can i have more help i tried that every time in part a and get the wrong answer on my webassign i tried it 5 times and got five different answers. the answer would be nice so i can get part b.

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