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Water, at volume flow rate Q=20 L/s, is delivered by horizontal fire hose and nozzle assembly. The hose (L = 100m, D = 75 mm, and e/D = .004) is made up of five 20 m sections joined by couplings. The entrance is squared edged; the minor loss coefficient for each coupling is Kc = 0.5, based on mean velocity through the hose. The nozzle loss coefficient is Kn = .02, based on velocity in the exit jet, of D2 = 25 mm diameter. Assuming the water temperature is 15 degrees C, estimate the supply pressure required at this flow rate.
Assume excavation costs at $100/m3, side lining costs at $50/m2, and cover cost at 25/m2. Determine the dimensions of the pit that minimize cost -If the side slope is unconstrained and -If the side slope must me less than 450
A micro-channel of diameter 0.5 mm and length 750 mm is connected to a plenum. A fan produces a negative gage pressure of -1.5 inch H2O in the plenum and draws air at 20oC into the micro- channel.
Our ESP is collecting 95% of the particles in our exhaust stream. We are under pressure to improve its performance. It has been suggested that if we were to cool the inlet gas from the present 600°F to 250°F, the performance would improve
The steam exits the high-pressure turbine at 2 MPa, is reheated to 550 degree Celsius, and then expanded through a low-pressure turbine to 50 kPa.
A rectangular channel of 2 m depth and 5 m width carries 1 m deep running water. It is laid to a slope of 0.001 with Manning’s n = 0.02. Some distance downstream there is a hump of height 0.5 m on the stream bed
What is the maximum size aggregate which can be used in concrete for the following conditions 1. slabs on grade 6 inch #2- slab on grade 4 inch.
A single screw extruder is being used to process pregelatinized starch. The screw dimensions are as follows: channel width 3 cm, channel height 0.5 cm and screw length 50 cm. The wall velocity is estimated to be 0.31 m/s.
A computer technician can handle on average 5 service calls per day. The cost of adding a technician (C1) is $200 per day and the estimated cost of waiting per incident (C2) is $250 per day.
two wooden members of uniform rectangular cross section of sides a = 100 mm and b = 60 mm are joined by a simple glued joint as shown. knowing that the ultimate stress of the joint are 1.26 MPa in tension and 1.50 MPA in shear and that P= 6kN
For the state of plane stress shown,determine a)principal planes b)principal stresses c) maximum shearing stress and corresponding normal stress
A lead-zinc mine is to be developed by a room-and-pillar layout. The mine is located at a depth of 500ft, the overlying rock has an average specific gravity of 2.56, and the pillar rock wast tested and found to have a
if gas is available at $0.50 per therm and the efficiency of utilization is 80 percent, what is the cost of heating energy in dollars per million Btu
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