1. The temperature distribution across a wall 0.3m thick at a certain instant of time is T(x) = a + bx + cx2 , where T is in 0C and x in meters, a = 200 0C, b = -200 0C, c = 30 0C/m2

The wall has a thermal conductivity of 1W/mK.

a) On a unit surface area basis, determine the rate of heat transfer into, out of the wall?
b) If cold surface is exposed to a fluid at 100 0C, what is the convective coefficient?

b would be the answer

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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causes

fossil fuels burn

cities become more industrialized

human population grows worldwide