A rubber-wheeled 50 kg cart rolls down a 60 degree concrete incline. Coefficient of rolling friction between rubber and concrete is μr = 0.02. A) What is the cart's acceleration if rolling friction is neglected?
B) What is the cart's acceleration if rolling friction is included?

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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igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods