Wet floors can sometimes be slippery. what is the reason for this?
a. the water increases the friction between the floor and the feet
b. the water decreases the friction between the floor and the feet

trig 15.3 cos

in physics zero. in muscle fatigue could be high

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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