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to achive a specific level of disinfection a water treatment plant operator determines the" Ct" value 180mg min/l is necessary with units for disinfectant concentration C in mg/l and disinfectant co
Carnot engine working between a source temperature of T2 and sink temperature of T1 has efficiency of 25%. if the sink temperature is reduced by 20 degrees Celsius the efficiency is increased to 30%
an iron cube at 400 degrees Celsius is dropped into a insulated bath containing 10kg of water 25 degrees Celsius. the water finally reaches a temperature of 50 degrees Celsius at steady state.
each wire has a tension of 1kN and is inclined at 45 degree to the vertical. calculate the increase in vertical stress at a depth 1 m below the surface and the amount of elastic settlement below the
A piston cylinder is initially at a state of 60c, 200kpa. Heat is added to the system from 500c reservoir until the final pressure is 400kpa. the mass of the air is 2kg, the spring constant is 1000k
COMP247 Data Communications. What is the maximum data capacity for traffic between Hornsby and the City store?
A perfectly mixed aeration pond with no recycle (return line) serves as the biological reactor for a small community. The pond receives 30 cubic meters/day of influent with a BOD5 of 350 mg/L that m
A reverse osmosis plant desalinates 5*10^6 L/day of feedwater containing 1500 mg/l of salt, yeilding 3*10^6L/day of product water with 75 mg/l of salt. What would be the salt concentration be in the
If the footings fails at a load of 82 kN, what is the failure load per unit area on the base of a square footing 2.0 m by 2.0 m loaded with its base at the same depth in the same materials
a cantilevered W12X136 (ASTM-A36) steel member beam is 18 feet in length. if a concentrated load of 12 kips is applied at a point 6.25 feet from the beam's free end, use the superposition technique
A wastewater treatment plant uses an activated sludge process for secondary treatment of 0.300 cubic meters / second of primary effluent. The mixed liquor has a concentration of 2,100mg VSS/L, and t
Write a VBA function that receives a gauge pressure and barometric pressure and then returns the absolute pressure. Have the function check whether the barometric pressure is zero
Compute the required layout distance if the Temperature is 13 degrees celcius, Tape Length is 29.990 m, and the required Layout distance is 500.000 m.
A pump of 80% efficiency lifts water from one large open tank to another; the difference in water surface elevations is 20 feet. The pipe is relatively smooth (f = 0.0122), and has 3 elbows, each wi
To verify the constant of a particular prism, a straight line EFG is laid out. The EDM instrument is first set up at E, with the following measurements recorded: EG = 426.224 m, EF = 277.301 m.
A distance of 72.55 ft is recorded using a steel tape weighing 0.016 lb per foot. The tapes is supported only at the ends with a tension of 15 lb. Find the distance corrected for sag.
A 50-m tape is used to measure between two points. The average weight of the tape per meter is 0.320 N. If the measured distance is 48.888 m, with the tape supported at the ends only and with a tens
if the steel tape to be used is only 99.98 under standard conditions and if the temperature is 87 degree farenheit at the time of the measurement, how far away from the existing station mark at 0 +
A rectangle commercial building must be laid out 200.00 ft wide and 300.00 ft long. if the steel tape used is 100.02 ft long under standard conditions, what distances would be laid out
Assume the flow is incompressible, irrotational, quasi-steady and the only body force acting is gravity. Determine the pressure, pb, required to increase the jet velocity by 50% relative to the valu
Determine the (a) the coefficient of statics friction between the hawser and the bollard. (b) the number of times the hawser should be wrapped around the bollard if a 20000 pound force is to be resi
a 300 lb block is supported by a rope that was wrapped 1 1/2 times around a horizontal rod. Knowing that the coefficient of static friction is .15 determine the range of values of P for which equili
Water flows through 800 feet of 12-inch diameter iron pipe (g = 0.0018 inches) between 2 open storage tanks, whose water surface elevation difference is 16 feet. The pipe entrance is flush and squar
At a distance of 20 km downstream of the plant, the river has an ultimate CBOD of 10 mg/L. The state has set an ultimate CBOD discharge limit for the treatment plant of 2000 kg/day.
The weight of the box is 20 lb and the coefficient of static friction between the box and the floor = 0.65. Neglect the weights of the bars. What is the largest value of the force F that will not ca