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A conservative tracer is applied to the ground surface and leached through the vadose zone by rainfall. The average volumetric water content is 0.40 over the upper 4 meters and 0.30 over the remaining 3 meters above the water table and the net infiltration rate (Darcy velocity) is estimated to be 22 cm/yr. If the dispersivity is estimated to be 8 cm, estimate the time between when the concentration ratios of C/Co = 0.1 and C/Co = 0.9 reach the water table (where Co is the initial tracer concentration).
As a design engineer you are responsible for all the drawing documentation from your organisation. What are the key aspects of the drawing you need to check before sending it to the construction division
An object has a mass of 46kg and weighs 450N on a spring scale. Determine the acceleration due to gravity at this location.
a 6 inch soil cement base and an 8 inch crushed stone subbase, which truck will cause more pavement damage?(assume drainage coefficients are 1.0)
A 2-inch diameter glass pipe is connected to a pipe network in which the pressure is 70 psig. If the length is 300 feet and the outlet is 10 feet above the pipe, determine the flow rate.
A simple "box-like" canoe has outer dimensions of 15.0 ft in length, 2.0 ft in width, and 1.0 ft in depth. The canoe shell is made of concrete with a specific weight of 58.0 lbs/ft^3 and contains 15.0 lbs of steel reinforcement with negligible vol..
A surveyor measures an angle with two instruments; call them A and B. Both instruments produced unbiased measurements, but the standard deviation of measurements made with instrument A is twice that of B.
A bicyclist is riding a bicycle on a flat road. The combined mass of the bicyclist and bicycle is = 110kg, the radius of each wheel is = 32.5cm, and the coefficient of rolling resistance between the tires and the road is = 0.245 cm.
For a given tank circuit resonance frequency, what is the parameter that determines the bandwidth
If arm OA rotates with a constant clockwise angular velocity of theta dot(first dirivatie)=1.5 rad/s. determine the force arm OA exerts on the smooth 4-lb cylinder B when theta=45 degrees.
A consolidated-drained triaxial test on a normally consolidated clay yielded a friction angle of 28°. If the all-round confining pressure during the test was 140 kN/m2, what was the major principal stress at failure.
Identical bricks 0.1m wide, and weighting 2kg are placed on a plate (assume the plate has neligible weight). Calculate the total weight (and force F required to balance the plate).
a new sports car has a drag coefficient of 0.30 and a frontal area of 21 ft^2, and is traveling at 119 mi/h. how much power is required to overcome aerodynamic drag if p = 0.002378 slugs/ft^3
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