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Consider again the scenario above. Assume the water is static. Assume a datum at the water surface. a) What is the total head 5.0m below the river bed b) What is the pore water pressure at that level
A river is 6 m deep. The riverbed material has a saturated unit weight of 19.5kN/m3. What is the effective vertical stress 12 m below the water surface
The solids in a specimen have a specific gravity of 2.65. If the oven-dry mass of the specimen is 25 kg, what is the volume of the solids in it
What is the dry unit weight, the saturated unit weight, and the buoyant unit weight, of a soil having a void ratio of 0.5 and a value of Gs of 2.7
Compare the total reactor volume required for 90% removal of a substance that decays according to first-order kinetics with a rate constant of 0.05 day -1 in a CM system that contains a single react
The influent flow is 380 Lpcd and the influent BOD5 is 200 mg/L. Pertinent data are: Primary clarifier removes 33% of the influent BOD5, and the state regulatory agency allows a volumetric loading o
what is the equivalent PF rate constant that would be used to describe treatment in a series of three CM reactors in terms of flow (Q), the total volume in the system (V), and the rate constant obse
On a shovel/truck operation the production of the shovel is 293 BCY/h and a job efficiency of 0.75. The trucks used have a capacity of 12 BCY and have a cycle time of 45 min.(excluding loading).
A motor grader will require 2 pases at 3 mph., 2 pases at 4 mph., and 2 passes at 5.5 mph. to accomplish the work How many grder hours will be required to accomplish this job if the job efficiency f
material (LCY) in 12 yard dump trucks, placing it, and compacting the weight of the soil is 3,750 lb/cu.yd. (30 pts.) (show your calculations) a) Find the Swell and Shrinkage b) Load and Shrinkage Fa
Find the minimum length of runway required for the landing (I found to be 300ft). Find the position on the runway where the speed is 50ft/s and the time it takes for the speed to reach 50ft/s
The acceleration of a particle is defined by the relationship a=-kx^-2 ft/s^2, where x is in feet and k is a constant. At x(0)=0.1ft, v(0)=0 and at x(1)=1ft, v(1)=10ft/s. Find the velocity at x=5ft.
Due to atmosphere drag, the deceleration equation is 60a=588.6-30v^2 in m/s^2. Find the velocity at which he lands on the ground. This velocity is referred to as terminal velocity, which is found by
A pickle producing plant produces and discharges a waste brine solution with a salinity of 13,000 mg/L NaCl at a rate of 0.14 MGD into a stream. Before the discharge enters the stream, the flow rate
At the instant shown, car A has a speed of 20 km/h, which is being increased at the rate of 300 km/h2 as the car enters an expressway. At the same instant, car B is decelerating at 250 km/h^2 while
A galvanized (zinc-coated) steel sheet is found to uniformly corrode with an average current density of 1.4 X 10-7 A/cm2. How many years will it take to uniformly corrode a thickness of 0.030 mm of
An investor has invested $250,000 in a new rental property. Her estimated annual costas are $6,000 and annual revenues are $20,000. What rate of return per year will the investor make over a 30-year
A machine costs $20,000 and has a 5-year useful life. At the end of the 5 years, it can be sold for $4,000. If annual interest is 8%, compounded semiannually, what is the equivalent uniform annual c
(1) To provide $750000 for th construction and $250000 for the initial equipment of a small engineering laboratory ; (2) to pay the $150000 per year laboratory operating cost; and (3) to pay for $1000
Annual maintenance cost for a particular section of highway pavement are $2000. The placement of a new surface would reduce the annual maintenance cost to $500 per year for the first 5 years and to
For a car traveling 35 mph the distance required to brake for a stop is normally distributed with mean of 55 feet and standar deviation of 8 feet. You are traveling 35 mph in a residential area and
Given that the moduli of electricity of this material are respectively 69GPa and 393 GPa plot modulus of elasticity versus the volum percent of Al2O3 in Al from 0 to 100 vol % using both upper and l
What is the largest circle that can be inscribed within a polygon with corner coordinates (600,800), (900, 300), (500, 100), and (100, 40) Find the radius of the largest circle and show how you foun
The number of teleport inquires x in a time sharing system average .2 millisecond and follows a Poisson distribution. Find the probability at least one inquiry is made during the next millisecond.
The number of telephone call coming in the business switchboard average 4 minutes/call. Let x be the number of calls received, Poisson variable. a. What is the probability there will be at least one