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A lagoon with volume 1500 mg/m3 has been receivingsteady flow of non-conservative waste (reaction rake k = 0.20/day)at a rate of 125 m3/day for a long enough time to assume that steady- state conditions apply. The wasteentering the lagoon has a concentration of 10 mg/L. Assuming completely mixed conditions,
a) What would be the concentration of pollutant in the effluent leaving the lagoon?
b) If the input waste concentration suddenly increased to 100 mg/L,what would the concentration in the effluent be 7 days later?
Use microsoft excel functions to find the net present worth of the project, and the internal rate of return,and the annual worth of the project?
compressed nitrogen (140 lbm) is stored in a spherical tank of diameter D = 2.5 ft @ temp. of 77 degrees Fahrenheit . what is the pressure inside the tank? if the max allowable stress is 30 ksi, find the minimum theoretical wall thickness.
By continuous discharge measurements the discharge in stream was determine over a 3-year period. After the data were assembled, it was found that the discharge exceeded 120 cfs 3 percent of the time;
vehicle A enters the interstate and travel at 60 mph for 1/2 hour, stops for 30 mins then continues at 70 mph. If a vehicle B enters the interstate at the same location as A,
Now 300 kJ of heat is transferred to the refrigerant at constant pressure while 110-V source supplies current to a resistor within the cylinder for 6 min. Determine the current supplied if the final temperature is 70 degrees C.
what is the second year book value for equipment with an initial cost of $11,000, a salvage value of 1,000 and a recovery period of 5 yrs for A. straight line depreciation. B. Double declining balance. C. MACRS
A turbine operates at steady state with steam flowing through it at a rate of 36 kg/min. The steam enters the turbine at a temperature of 600C and a pressure of 8 MPa and exits at a pressure 90% lower with a quality of 70%.
a rectangular beam with a width of a 8 in. an effective depth of 10 in., and a total depth of 12 in., is reinforced with a single fiberglass reinforcing bar that has a cross sectional area of 0.45 in^2.
Calculate the area of a circular tract of land which has a radius of 30 meters using the mathematical formula, Trapezoidal Rule, and Simpson's Rule. Compare your results. Use an offset of 5 meters.
The bar is confined to move along the vertical and inclined planes. The velocity of the roller at A is Va=5.2 ft/s when theta=40 . a)Determine the bar's angular velocity when theta=40. b)Determine the velocity of roller when theta=40.
If the 20-kg crate is originally resting on the floor such that the cable tension is zero at the instant the motor is turned on, determine the speed of the crate when t=6s.
Assume the capacity of a pile supporting a transmission tower is modeled with a log-normal random distribution with a mean of 250 tons and a c.o.v. of 20%. a) What is the probability that the pile will survive a load of 275 tons
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