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Gas flows at a steady rate in a 120-mm-diameter pipe that enlarges to a 180-mm-diameter pipe. At a certain section of the 120-mm pipe the density of the gas is 165 kg/m^3 and the velocity is 15 m/s. At a certain section of the 180-mm pipe the velocity is 10 m/s. What must be the density of the gas at that section? If these same data were given for the case of unsteady flow at a certain instant, could the problem be solved? Discuss.
Assume the rate constant for BOD decay is 0.2 d^-1, the mean velocity of the stream is 0.5 m s^-1, and the initial concentration is 100 mg L^-1 at x=0. Plot the resulting concentration with downstream distance x in km.
An undisturbed saturated soil has a specific weight total of 18.85 kN/m3 and a moisture content of 32.5%. Determine the voids and the density of the grains of soil.
Determine the maximum allowable temperature rise if the allowablecompressive stress in the copper is σ(allowable) = 19,500 psi.
A state legislator wishes to survey residents of her district tosee what proportion of the electorate is aware of her position on using state funds to pay for abortions. a)What sample size is necessary if the 95% Confident Interval
An overpass is being built over the PVI of an existing equal tangent sag curve. The sag curve has a 70 mi/h design speed, and G1 = -6%, G2 = +3%.
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.
A polycrystalline Al alloy contains a dispersion of hard particlesof diameter 10-8m and average center to center spacingof 6x10-8m measured in the slip planes. Estimatetheir contribution to the tensile yield strength,σy, of the alloy.
Four strain gages are mounted at 90o intervals around the circumference of a 100-mm steel shaft. E= 200 GPa, and ? = 0.3. All gages are oriented at an angle of 45o with respect to the longitudinal axis of the shaft.
A barge measures 10 ft (depth) by 35 ft by 120 ft and weighs 100 U.S. tons. The barge floats in fresh water (specific weight = 62.4 lb/ft3) and is evenly filled with 38,000 bushels of corn (60 lb/bushel).
Find the maximum production rate of B in moles per minute and the optimum for (a) a plug flow reactor (b) a mixed flow reactor Find the production rate of B in moles per minute for (c) a mixed flow reactor with V = 100 m3
An oedometer test on a clay soil gave the following results: Cc = 0.4, Ce = 0.08, OCR = 5. The thickness of the clay layer in the field is 2.6 m. The existing vertical effective stress at the mid-depth of the clay layer is 150 kPa. This vertical effe..
A signal approach has 20 seconds of displayed green, 4 seconds of yellow, and 3 seconds of all red (assume typical start-up, lost time, and clearance time). The cycle length is 60 seconds.
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