A horizontal pipe with water flowing through it has a circular cross section that varies in diameter. the diameter at the wide section is 4 times the diameter at the narrow section. If the rate of flow of the water in the narrow section is 9.0 L/min, the rate of flow of the water in the wide section is:

9.0 L/min

Explanation:

From the given information, the flow rate in the wider section appears to four times that of the narrow section.

Since the flow rate for a pipe at any time (t) = Area (A) × speed (V)

we can say that:

Then, the flow rate in the wider section will also be 9.0 L/min. This is because the mass flow rate must be kept constant regardless of the changes in the size of the cross-sectional area.

this could be newton#'s law of cooling. the cooling curve is exponential

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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