Take a look at a bicycle with gears. using what you have just learned, answer the following questions:

which gear combination would you like to use when you want to pedal with as few strokes as possible and have your wheels turn as many times as possible?
now you are going up a hill and want to maximize the force you deliver to the wheel. you aren’t concerned with how many strokes you are making, but you want to get as much force to the wheel as possible. which gear combination would you use now, and why?

more than, less

less than, more

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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