A biology teacher drives from Naperville over the Cleveland to visit her sister. During the trip there, she travels the first half of the time at 60 km/hr and the second half the time at 95 km/hr. When she comes back, she drives the first half the distance at 60 km/hr and the second half of the distance at 95 km/hr. Required:
a. What is her average speed going over to Cleveland?
b. What is her average speed coming back from Cleveland?
c. What is his average speed during the entire trip?
d. What is his average velocity during the entire trip?

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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conservation of mass

mass before something happens = mass afterwards