Answer:
Explanation:
Total rotational kinetic energy =
(Here fly wheel may have translational kinetic energy but we ignore here)
Angular speed = 3000 revolutions per minute
Angular speed = revolutions per second
Thus , Kinetic energy =
=
Where’s the picture of the problem
B. The resistance is directly proportional to length and inversely proportional to cross sectional area
Iron and nickel are the elements most similar to cobalt