The vector sum of three co-planar forces o must be perpendicular to the plane. must be zero. o must be perpendicular to one of the three. o may have any direction in the plane. o must be parallel to one of the three.

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explanation:

that would be b i just took the test : )

wavelegth as in spectrum red oygbiv

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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