Aperson with no experience in fluid mechanics wants to estimate the friction factor for 1-in.-diameter galvanized iron pipe at a reynolds number of 12000. the person stumble across the simple equation of f = 64/re and use this to calculate the friction factor. consider the problem with this approach and estimate percentage of their error (fa-f)/fa, where fa – actual friction factor.

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.