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A river 5 m deep flows over a sand deposit. The saturated unit weight of the sand is 18 kN/m^3 and the unit weight of water is 9.8 kN/m^3. At a depth of 5 m below the river bed:
1) Determine the total vertical stress, the pore water pressure, and the effective vertical stress.
2) If the river level falls to the river bed, what would be the effective vertical stress?
A room 4x5x6 meter is heated by a baseboard resistance heater. We want the heater to raise the room temperature from 7 to 23 deg C in 15 minutes. There are no heat losses from the room, and specific heat may be assumed constant.
A wastewater treatment plant must disinfect its effluent before discharging the waste water to a near-by stream. The wastewater contains 4.5x10^5 fecal coliform colony-forming units (CFU) per liter.
A water pipe, in diameter id located in a trench 450mm below the center of the slab. The trench running along the length of the slab,300mm wide and 450mm deep, was backfilled with the same soil. If this pipe were to leak, what effect would it have..
A tensiometer is used to measure a compacted soil in the field that has a matric suction of 200 kPa under atmospheric conditions. The pore-water pressure measurement in the tensiometer reaches -99 kPa
Assume the rate constant for BOD decay is 0.2 d^-1, the mean velocity of the stream is 0.5 m s^-1, and the initial concentration is 100 mg L^-1 at x=0. Plot the resulting concentration with downstream distance x in km.
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. Use a short cut key of Ctrl+g
During the recent camping trip, a curious junior engineering student (like yourself) noticed that water is being discharged from a high reservoir to a stream in the valley through a 0.3 m diameter plastic pipe.
A 900-mm strip of steel is bent into a full circle by two couples applied. Determine (a) the maximum thickness t of the strip if the allowable stress of the steel is 420 MPa, (b) the corresponding moment M of the couples.
Determine the arrival rate assuming that it is unchanged over the duration of the observation period. An approach to a pretimed signal with a 60second cycle has nine vehicles in the queue at the beginning of the effective green.
Assume the specific gravity is 2.7. Given this information, determine (a) the phase diagram of the soil, (b) the void ratio, (c) the porosity, (d) the dry density, and (e) the saturated density.
A movable cone fits inside a stationary conical depression. If a torque is applied to the cone, the cone will rotate at a certain speed depending on the angles θ and β, the radius r o, and the viscosity μ of the liquid.
A wheel tractor-scraper is operating on a level grade, assuming no power derating is required for equipment conditions, altitude, and temperature.
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