Which of the following requires the expenditure of more work?(a) Lifting a 90newton [N] weight a height of 5meters [m].(b) Exerting a force of 60pounds-force [lb Subscript f]on a sofa to slide it 30feet [ft] across a room.

90 Newton weight a height of 5 meters.

Explanation: To figure out "work", in physical science, the formulais is force X distance = work.

So if you add the the question about the sofa it would look like this

90 X 5 = 450

and the other question just add it in like this

60 X 30 = 180

You can already tell that 450 is bigger than 180

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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