Question

in a design of a passenger bus it is proposed to derive the motive power from the energy stored in fly wheel. the fly wheel has a moment of inertia of 400kgm2 is accelerated to its maximum rate of rotation 3000 revolutions per minute by electric motors. calculate the maximum kinetic energy which can be stored in the fly wheel

Answer 1

`5*10^(5) Joule`

Step-by-step explanation:

Total rotational kinetic energy =
`(1)/(2)*Inertia(angular speed)^(2)`

(Here fly wheel may have translational kinetic energy but we ignore here)

Angular speed = 3000 revolutions per minute

Angular speed =
`(3000)/(60)=50` revolutions per second

Thus , Kinetic energy =
`(1)/(2)*400(3000)/(60) ^(2)`

=
`5*10^(5) Joule`