A girl runs once around a circular track with a radius of 65m at a speed of 2m/s. Her displacement is:

f=ma a/f/m a= 480/60 a = 8m/s/s that is quick wow

d) physical means can be used to separate the components of air.

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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