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A sample of argillaceous soil with a volume of 1x10-3 m3 and a mass of 1.762 kg, after oven dried, has a mass of 1.368 kg. The relative density of the grains is equal to 2.69. Determine, for the sample in its original condition:a) dry unit weightb) moisture contentc) voidsd) voids filled with air (expressed as% of voids = Sa = degree of air saturation)
Considering a sample of this soil completely saturated by water, which has not undergone fading in the process of saturation (ie, assuming that it has the same voids above), determine, also:e) moisture contentf) overall specific weight.
mechanical oscillations can be described in general by the following function: y(t)= e^(-t/m) *sin(wt+phi). where (t) is time and (w) is the oscillation angular frequency in radians per unit time.
a 110 cubic centimeter volume of clay weighs 145 g in its undisturbed state. when the clay specimen is dried it weighs 110.5g. what is the natural water content of the clay, and what is the degree of saturation Assume Gs=2.70
Knowing that each member has a 2 3 4-in. rectangular cross section and that each pin has a 12 -in. diameter, determine the maximum value of the average normal stress (a) in member BE, (b) in member CF.
A contaminant in water is traveling through a saturated clay layer under a hydraulic gradient of 0.15. The clay has a hydraulic conductivity of 2 x 10^(-7) cm/s, a moisture content of 19%, and a Gs of 2.65.
The emission rate of radon into the crawl space is reported to be 0.6 pCi/m^2-s. An exhaust system was added to provide 1 air exchange per hour (ACH) in the crawl space. The outdoor concentration of radon is 1 pCi/L.
The shape below has a cut along the entire length of the member thus making it an open section. The uniform thickness is 0.125in. Determine the maximum shear stress for the shape. Compare the stress for this open shape to a shape without a cut.
A projectile is fired with an initial velocity of 800 ft/s at a target B located 2000 feet above the gun A and at a horizontal distance of 12,000 feet. Neglecting air resistance, determine the value of the angle at which the projectile is fired.
The maintenance costs begin in 31st year at $300,000 annually. How much must be deposited now if the fund will earn 5% interest. How much does this change if the interest rate is 4%
if a pipeline is horizontal, what is the porportion of the potential energy head at the upstream crossection that is changed to kinetic energy head at the downstream crossesction
A biological reactor is used to treat wastewater from a small community (Q = 100,000 gpd). The influent BOD5 concentration to the reactor is 200 mg/L and the required effluent BOD5 concentration is 30 mg/L.
Plot the distribution of vertical effective stress and porewater pressure with depth if the void ratio of the sand is 0.6 and the degree of saturation is 90%. Neglect pore air pressure
If they plan to increase their savings by 5% each year, how much must they invest in the first year given that they expect to earn 4% per year on their investment?
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