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Define the f/m ratio in the context of biological treatment of wastewater, and relate the f/m ratio to the exponetial growth and declinign growth phases of a bacterial culture. Hoe does the f/m ratio influence the metabolism, the rate of BOD removal, and the settleability of sludge?
If a torque of T = 1,100 N-m is applied to the composite assembly, determine: (a) the maximum shear stress in the aluminum tube and in the steel core. (b) the rotation angle of end B relative to end A.
Knowing that the coefficents of friction between the tape and the drums are us=.40 and uk=0.30 and that drum C is free to rotate, determine the smallest allowable value of P if slipping of the tape on drum B is not to occur.
The compacted specimen contains 6% asphalt binder by weight of total mix, and has a bulk density of 143.9 lb/ft^3. Ignoring absorption, compute the percent voids in total mix, percent voids in mineral aggregate
Assuming a standard driver reaction time of 2.5 seconds, what is the probability that the vehicle pulling out will get in an accident with oncoming traffic?
CALCULATE THE REQUIRED DIAMETER OF STEEL TIE RODS NECESSARY TO SUPPORT A BALCONY. EACH ROD, SUSPENDED FROM A ROOF TRUSS, SUPPORTS A FLOOR AREA OF 7.0m^2. THE COMBINED BALCONT FLOOR LOAD IS 10.5 kPa
A small chunk of the original sample had a wet weight of 140.9 grams and weighed 85.2 grams after drying. Compute the water content, using the correct number of significant figures.
A force of 1.25x103N is required to lift an object that is under the influence of an acceleration due to gravity of 7.66ft/sec2. What is the object's mass in kilograms?
If vehicle arrivals at the lot follow a poisson process, with arrival rate lambda = 0.2 vehicles/hour, what is the probability the lot is full at 9:15 AM. Assume that no one leaves during this period.
A city is subjected to occurrence of hurricane and tornado with the average probabilities of 0.3 and 0.2 per year, respectively. Assume occurrence of these events is statistically independent.
A suburban street receives storm water runoff at a rate of 2.0 L/m-s (one each side). the street has a slope of .8 percent and a cross slope of 2 percent, n = .013.
Determine the uniform flow depth in a trapezoidal channel with a bottom width of 8 ft and side slopes of 1 vertical to 2 horizontal. The discharge is 100 ft3/s. Manning roughness factor is 0.015 and the channel bottom slope is 0.004.
suppose 76% of all commuters ride to work in carpools. if eight workers are randomly selected, find the probability that at least 7 will ride in carpools
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