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Air at 0.9 MPa and 400 K enters a converging nozzle with a velocity of 180 m/s. The throat area is 10 cm2. Assuming isentropic flow, calculate and plot the mass flow rate through the nozzle, the exit velocity, the exit Mach number, and the exit pressure-stagnation pressure ratio versus the back pressure-stagnation pressure ratio for a back pressure range of 0.9 ≥ Pb ≥ 0.1 MPa.
An aquifer is 45 meters deep and has a well that pumps water at 850 cubic meters per day. One observation well is located 45 meters away and has a water surface that is 44.35 meters above the bottom of the aquifer.
Let X be a random variable defined by the density function f(x) = 3X^2 0
The backfill soil's unit weight and angle of internal friction are 17.2 kN/cubic meter and 31 degrees respectively and the angle of wall friction friction between backfill and wall is 20 degrees. Find the total active earth pressure against the wa..
Water flows from a ground storage tank that is 450 feet above a town's water distribution system. The pressure at the entrance of the system must be at least 75 psi and the demand is 1350 GPM.
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
After operating for a period of time, assume that the opening size decreases to 10-mm due to the accumulation of materials (debris) on the screens.
The flow rate of the treatment plant is 2,000 m3/d. a. Calculate the mass of sodium bicarbonate (NaHCO3) that would be required per day to replace the alkalinity consumed.
Calculate the chord lenght between stations 75.00 and 75.75 on a circular curve with a Da = 5.5 degrees (arc definition) ? Da is degree of curve not deflection angle.
write a function that calculates the average of a set of numbers. name the function calculate_average. the function should accept one input which is an array of numbers.
A hole is drilled in an aluminum plate with a steel drill bit whose diameter is 6.245 cm at 20 degrees Celsius. In the process of drilling, the temperatures of the drill bit and plate rise to 168 degrees Celsius.
A supervisor is sitting at her desk illuminated by a 180 candela source 3 feet above it. She is writing with green ink (reflectance=30%) on a yellow note pad (reflectance=60%). What is the illumination on the note pad?
Atrazine is an herbicide widely used for corn and is a common groundwater pollutant in the corn-producing regions of the United States. The log Kow for atrazine is 2.65. A typical application rate is 0.25 g/m2.
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