2005_Exam2 - 057:20 TEST 2 Fall 2005 1 Water flows through...

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057: 20 TEST # 2 Fall 2005 1. Water flows through a horizontal pipe at a rate of 1 gal/s. The pipe consists of two sections of diameters 4 in and 2 in with a smooth reducing section. The pressure difference between the two pipe sections is measured by a mercury manometer. Neglecting frictional effects, determine the differential height of mercury between the two pipe sections. ( 3 1 0.13368 gal ft = . The densities of mercury and water are 3 Hg 847 lbm ft ρ = and 3 62.4 w lbm ft = ) Fig 1 (for Problem 1) 2. Firefighters are holding a nozzle at the end of a hose while trying to extinguish a fire. If the nozzle exit diameter is 6 cm and the water flow rate is 5m 3 /min, determine (a) the average water exit velocity and (b) the horizontal resistance force required of the firefighters to hold the nozzle. You can take the nozzle and the horizontal portion of the hose as the control volume such that water enters the control volume vertically and outlets horizontally (This way the pressure force and
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