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A treatment plant has a horizontal flow sedimentation tank with a depth of 4m, width of 6m, length of 36m, and process flow rate of 450m3/h. What removal percentage should be expected for particles
A 2 foot tall multi-stage weir placed in a channel to cause the water to flow over the contracted weir at a height of 0.75 feet. There are 2 contractions and the original length is 6 feet. What is
EXPLAIN BRIEFLY WHY THE COMPRESSIVE STRENGTH OF WOOD LOADED "PARALLEL" TO ITS GRAIN IS HIGHER THAN THE COMPRESSIVE STREGTH OF THE SAME WOOD LOADED "PERPENDICULAR" TO THE GRAIN
Consider your cooking gas contains 80% propane and 20% butane. While burning on a cooktop, assume it burns with 200% excess air. If no heat is lost, determine the maximum possible flame temperature.
For a mixture 10 mol % methane 20 mol % ethane 70 mol % butane at 50 degrees Fairenheit determine the bubble point pressure
above a peninsula of land. the length of the box is 25 km, its width is 80 km, and a radiation inversion restricts mixing to 25 m. Wind is blowing clean air into the long dimention of the box at 0.8
Use input values of epsilon (B1), pipe radius (B2), and Reynolds number (B3) to estimate "f" and place these in the same cells . Display the final answer in a message box and round to five figures.
Determine the diode currents I1 and I2. Assume that cut-in voltage for both diodes is VΥ = 0.7V and what is the greatest reverse voltage that will appear across the diode?
A four year financial project has net cash flows of $20,000; $25,000; $30,000; and $50,000 in the next four years. It will cost $75,000 to implement the project. If required rate of return is 20%, c
A temporary flood wall has been constructed to protect several homes in the floodplain. the wall was built to withstand any discharge up to the 20-year period after all the homes have been relocated
What return period must an engineer use in the design of a bridge opening for a 50% risk that flooding will occur at least once in two consecutive years? Repeat for a risk of 100%.
A company facing an interest rate of 8% must choose among projects offering the following four-year cash flows. If the company is employing the net present value criterion, which project should they
The steam flow rate entering the pipe is 2500kg/hr. Due to heat loss from the pipe to the surrounding air (at 25 C) 20 kg/hr of condensate is formed in the pipe and removed at the end of the pipe.
If they are sliding on a smooth horizontal plane with the velocities shown, determine their speeds just after impact. The coefficient of restitution between them is e = 0.6. Disks A and B have a mas
The cost to build the motel is estimated at $8,000,000; Value Lodges estimates furnishings for the motel will cost an additional $700,000 and will require replacement every 5 years. Annu
Fabco, Inc., is considering purchasing flow valves that will reduce annual operating costs by $10,000 per year for the next 12 years. Fabco's MARR is 7 percent/year. Using an internal rate of return
A complete mix activated sludge plant operates at design Q, with the reactor tank volume set by a nominal= 6 hours.. a) It was anticipated that it would operate at 25% RAS for an expected Xr= 2,000 mg
determine diameter of 200 m section commercial steel pipe (darcy's friction factor f = 0.0115) that carries a flow of 0.24 m^3/s and allowable head loss ove the section is 3.5 m.
(i) volume to supply the peak demand of 1.8 times the average demand. (ii) volume to supply fire flow for at least 9 hours, and (iii) volume to supply emergency storage 600 L/day/capita. (1 L = 0.00
Data from service records show that the time to repair a certain machine is normally distrubuted with a mean of 65 min and a standard deviation of 5 min. Estimate how often it will take more than 75
An excavation is proposed for a site consisting of a homogenous, isotropic later of silt clay, 14.24 m thick, above a deep deposit of sand. The groundwater is 2m below ground level outside the excav
A smart, anti armour weappon is launched of an aircraft flying at 250 knots (422 FT/s) straight and level at an altitude of 300FT above the ground, the weapon is released from the aircraft with an i
A powered model rocket is launched in the vertical direction. The altitude of the rocket is 100FT (above ground level) at the end of the powered portion of the flight. The rocket lands 19.676 second
Field tests have shown that the Horton equation best describes the composite roughness of the channel. Find the capacity of the main channel and the lateral extent of the floodplains for a 100-year
Water flows i a 8-m-wide rectangular channel that has longitudinal slope of .0001. The channel has an equivalent sand roughness of 2mm. Calculate the uniform flow depth in the channel when the flow