1. A wastewater treatment plant discharges 100 gal/min of treated water through a 0.25 m diameter steel pipe. Estimate the fold change in pumping cost if this steel pipe is replaced with a 0.2 m diameter smooth plastic pipe

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?