A sanding disk with rotational inertia 8.2 x 10-3 kg·m2 is attached to an electric drill whose motor delivers a torque of magnitude 14 N·m about the central axis of the disk. About that axis and with torque applied for 54 ms, what is the magnitude of the (a) angular momentum and (b) angular velocity of the disk?

a) , b)

Explanation:

b) Final angular speed is obtained by using the concept of Angular Momentum and Impact Theorem:

a) The angular momentum of the disk is:

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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