Author Question: To drive a typical car at 40 mph on a level road for one hour requires about 3.2 107 J of energy. ... (Read 19 times)

09madisonrousseau09 · **on:** Jul 29, 2018

To drive a typical car at 40 mph on a level road for one hour requires about 3.2 107 J of energy. Suppose we tried to store this much energy in a spinning, solid, uniform, cylindrical flywheel.

A large flywheel cannot be spun too fast or it will fracture. If we used a flywheel of diameter 1.2 m and mass 400 kg, what angular speed would be required to store 3.2 107 J?
A) 3600 rad/s B) 940 rad/s C) 530 rad/s D) 5500 rad/s E) 1800 rad/s

Question 2

Find the net work done by friction on a box that moves in a complete circle of radius 1.82m on a uniform horizontal floor. The coefficient of kinetic friction between the floor and the box is 0.25, and the box weighs 65.0N

A) 1800 J B) 370 J C) 0 J D) 190 J

todom5090 · **Reply #1 on:** Jul 29, 2018

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