This is very much related to my core subject and being a chemical engineer I know the concepts of transport phenomena and line sizing and pressure drop calculations and also I have various tools in order to give you a pictorial representation for the First problem you have given and already I have found the answer for the SECOND QUESTION IS 0.4 psi approximately and for the third problem assuming the fluid is air and using the simple Hagen poiseulle equation I got an answer of 0.6354* 10^-3 cm which might be wrong , but if the question contains some other data it'd be useful for me (eg. viscosity, temperature and fluid). I'm working on the first problem and if you're interested accept my bid and I dont care about the Prices and to say I'm just interested in solving these kind of engineering problems. Thank You!