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Calculate the critical radius and the number of atoms in the nucleus of the homogeneous nucleation in GERMANIUM. The latent heat of fusion is 8100 cal per g-mile (atom) and the coefficient of linear
A wastewater treatment plant has a flow of 30 mgd. The influent BOD is 250 mg/L. Assume that 30% of the BOD is removed in the primary clarifiers. The plant is designed to carry 3,000 mg/L of VSS in
The sediment sample is 30 cm long. The porous plates on top and bottom of the sample holding it in place have a vertical hydraulic conductivity of 0.001 cm/s and each have a thickness of 10 cm.
The river characteristics just upstream of the wastewater discharge are: flow = 7.5 m3/s, BOD = 5.5 mg/L, DO = 90% of saturation, and temperature = 25oC. For this water, kd = 0.18 d-1 and kr = 0.22
jar tests were perfomed on untreated river water. an optimum dose of 12.5 mg/L of alum was determined. determine the amount of natural alkalinity (mg/L as CaCO3) consumed.
On the property they found a 20,000 m3 brine pond containing 25,000 mg/L of salt. The new owners propose to flush the pond into their discharge pipe leading to the Atlantic Ocean
A water treatment plant is being designed for a flow of 1.6 m^3/s. How many rapid sand filters, using only sand as the medium, are needed for this plant if cross-sectional area of each filter is 10
You have determined that a 0.5 ppm concentration of copper sulfate should be applied to a lake to control the growth. The lake volume is 50 ac-ft. How many pounds of copper sulfate should be dissolv
Determine an appropriate pipe diameter and slope for this reach, and establish the pipe invert elevations at the upper and lower manholes. Assume that a minimum earth cover of 2 m above the pipe cro
What is the maximum population that can be served by a 900 mm diameter main sewer constructed on minimum grade. If sewage flow in the pipe never exceeds a depth of 600 mm, estimate the actual popula
A time interval of 1.5 hours is recorded for a 6 inch drop of water level in a percolation (perc) test hole. What is the perc rate. How many laterals would be required in the leaching field to serve
A horizontal het of water at 5 degrees celsius strikes a block and is deflected upward 30 degrees. The mass flow rate of the water is 1.75 kg/s. The mass of the block is 1.30 kg. The jet has a cross
A steady, incompressible two-dimensional velocity field is given by the following components in the xy-plane u = 0.205 + 1.72x + 0.851y v = -0.509 + 0.953x - 1.72y
Find the length and width of a square basin for virus disinfection of a flow of 6 MGD. You may assume a depth of 5 ft, a C(dot)t product of 10 (mg/L) (dot)min for 1.5-log removal, and a target free
The driver of the vehicle does not look for oncoming traffic. Road conditions and vehicle speeds on the highway are such that it takes 1.5 seconds for an oncoming vehicle to stop once breaks are app
The design of a concrete mix requires 1173kg/m3 of gravel in SSD condition, 582 kg/m3 of sand in SSD condition, and 157kg/m3 of free water. The gravel available at the job site has a moisture conten
The continuity equation is just the water balance for the slope or any small portion of the slope and can be given as: p - fp = RO where i = rainfall rate, fp = infiltration capacity, and RO = runof
Oxygen flows without a gain or loss of heat through a horizontal pipe of constant cross section. At section 1 the pressure 175 psia, the velocity is 78 fps, and the temperature is 50°F; at secti
A design for a hovercraft is made. A fan sends air in from the top of the rectangular chamber (60F) and is exhausted between skirts and the ground. Pressure in the chamber is responsible for lift, a
determine the dilatation and change in volume of the 200mm length of the rod if A) the rod is made of steel E=200 Gpa v=.30 B)the rod is made of aluminum E=70 Gpa v=.35.
The municipal wastewater treatment process for a hypothetiical town consists of two separate lagoons being operated in series. The first lagoon has a volume of 4 million gallons, while the second la
If 90% of the weight of this brown sugar is sucrose (C12H22O11), what mass of dissolved oxygen would have been required to degrade this mass of sucrose had some not been recovered from the barge pri
If the quantity of ash released from the power plant each minute were to be eventually despersed in 4,000,000 m^3 of air at 25 degrees Celsius and 1 atm, what would be its concentration expressed in
What is the most significant difference between "free" jets and flows in confined structures (nozzles, pipes, etc.) in terms of formulation of force terms ÓF(i.e. left hand side) of the momen
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 i