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The compressive strength of concrete has a (population) mean of 2500 psi and a (population) standard deviation of 50 psi. Find the probability that a random sample of n= 5 specimens will have a sample mean strength that falls in the interval from 2490 psi and 2510 psi.
calculate the amplitude F0 of the sinusoidal excitation force that is necessary to produce a steady-state vibration with a velocity amplitude of 10 m/s at resonance. what is the corresponding amplitude of the acceleration
At a point in a saturated normally consolidated clay layer the soil is subject to an in-situ vertical effective stress of 50kPa. The soil at the point has a moisture content of 44% and a compression index of 0.45.
An asphalt mixture is placed and compacted. Two tests are taken from the compacted mixture and checked for density. Core 1 had a density of 2403 kg/m3 and an air void content of 6.5%. Core 2 had a density of 2419 kg/m3.
The factory will use a 4 ft deep on-site lagoon to stabilize the waste with a loading rate of 20 lb BOD/acre-day. Part a) What is the total BOD loading per day?
The kill of pathogens by disinfection in water treatment can be described by a first order reaction. Complete a reactor comparison for a batch reactor, CSTR and PFR for disinfection. The treatment plant produces 100 L/s of water.
Determine the chemical oxygen demand (COD) of a mixture of 250 mg/l glutamic acid (C5H10N2O3) and 200 mg/l of glucose(C6H12O6).
a force is specified by the vector F=160i+80j-120k N.calculate the angles made by F with the postive x y and z axes.
How fast will it be going when it hits the ground?
A waste mixture contains a variety of volatile organic compounds, nonvolatile organics, metals, and sandy soil. In a vitrification treatment, a. which of these materials are likely to be retained in the resulting solid
We would continue embankment work even if winter season and my question is what is swelling amount of compacted soil for 30cm thickness and 95% compaction degree by freezing.
A water sample has phenolphthalein alkalinity (PPA) of 30 mg/L as CaCO3 and total alkalinity (TA) of 84 mg/L as CaCO3. If OH alkalinity is 5.3 mg/L as CaCO3, Calculate the alkalinity due to HCO3- and CO3-2.
The traffic that makes a left turnat an intersection consists of two types of vehicles, Type A andB. A type A vehicle is twice the length of the type B. THe left turn lane can accommodate ten vehicles of type B, five oftype A.
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