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hey all, just a quick question on thermo properties: does enthalpy, internal energy, specific value and entropy of a material all change with composition?

Hey guys, I hope you can help me out on understanding the concept of pressure drops in pipes.  For the pressure drop equation P2 - P1 = pgHf (where Hf is frictional head loss), does this only apply to pipes when elevations are the same, z1 = z2?  Also, if the pipe is sloped at an angle, then...

Does anyone have a better explanation for the hydrograph problem in Example 20.4, Part B from the CERM? I'm not understanding their solution so if someone can please explain that'd be great!

Hello, I am stuck on the following problem: Water flows in a rectangular channel with depth of 0.40 m, width of 1.0 m and velocity of 6 m/s. Calculate the alternate depth.  Here is how the solution manual solved it: E = y1 + v2/2g Plugging in the values above will give you 2.235 m for the...

I'm stuck on solving the problem below: A 72 inch diameter vitrified sewer pipe (n=0.014) is laid on a slope of 0.00025 and carries wastewater at a flow of 50 ft^3/s. What is the depth of flow? I think I have to somehow follow the mannings n graph line from the Hydraulics elements graph for...

When determining the roughness, e, of a pipe - which value do we use from the range provided in the table? For example, the values of e for cast iron range from 0.0006 - 0.003 (im looking at the table on the moody diagram from the PE handbook). Do I take the average of the highest and lowest...