Acar is designed to get its energy from a rotating
flywheelwith a radius of 1.50 m and a mass of475 kg. before a trip,
the flywheel isattached to an electric motor, which brings the
flywheel'srotational speed up to 4000 rev/min.
(a) find the kinetic energy stored in
theflywheel.
b) if the flywheel is to supply energy to the car as would a15.0-hp
motor, find the length of timethe car could run before the flywheel
would have to be brought backup to speed.

3. a worker pushes a 30.5 kg polished stone along a polished table with a force on bonin a straight line for 5.20 s after starting from rest. there is no friction between thestone and the table. at the end of the table. the stone is hooked to a cable with a lengthof 62.0 cm to rotate it to a rough table to store until they can be picked up. the roughtable has a coefficient of static friction 0.702 with the polished stone. remember that 8= 9.80 m/s2a) what is the speed of the stone when it is hooked to the cable? b) what is the tension in the cable while the stone is rotating? (there is still nofriction)c) how much force is needed to make the stone begin sliding from rest on therough table? ius = 0.70262.0 cm30.5 kg20.5 kg6= 0