The figure shows a block (mass mA) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to a second block (mass mB), which hangs vertically. Ignore friction and the masses of the pulley and cord. (Figure 1). a) Determine the acceleration of the system?
b) Determine the tension in the cord?

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no. dot product   =0 when vecs at right angles

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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there are no components of a physical goal mentioned on the list of choices that you've provided.