Two students are riding bicycles in different directions. Student A is riding her bicycle north at 10 m/s. Her mass, including her bicycle, is 60 kg. Student B is riding his bicycle south at 8 m/s. His mass, including his bicycle, is 65 kg. What is the total momentum, magnitude and direction of the system of the two cyclists?

a.   mass number from atomic number

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.

hope this ! this is not copied! search it up, it's free of plagiarism!