Aflywheel is a solid disk that rotates about an axis that is perpendicular to the disk at its center. rotating flywheels provide a means for storing energy in the form of rotational kinetic energy and are being considered as a possible alternative to batteries in electric cars. the gasoline burned in a 310-mile trip in a typical midsize car produces about 1.10 109 j of energy. how fast would a 12-kg flywheel with a radius of 0.32 m have to rotate to store this much energy? give your answer in rev/min.

Explanation:

Given:

energy to be stored in a flywheel,

mass of the flywheel,

radius of the flywheel,

To find:

rotational speed, N=?

We know that kinetic energy of a flywheel can be given by:

.................................(1)

&

......................................(2)

where:

I=moment of inertia

= angular velocity in radian per second

putting respective values in eq. (2)

Now, from eq. (1)

∵    

they should be similar or the same

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.