Water flows in a constant diameter pipe with the following conditions measured: at section (a) pa = 32.4 psi, and za = 56.8 ft; at section (b) pb = 29.7 psi, and zb = 68.2 ft. calculate friction loss. (assume va = vb) bonus (5 pts): is the flow from (a) to (b) or from (b) to (a)? explain your answer with reasons/proves.

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?