HELPS PL What would you expect the force to be if the charge of object A was 5.0 x
10^-4 C and the charge of object B was 4.0 x 10^-4 C?

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

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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the doppler effect is used by weather forecasters to measure 

moving clouds