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1.The concentration of a chemical degrades in water according to first order kinetics. The degradation constant is 0.2 1/d. If the initial concentration is 100 mg/L, how many days are required for the concentration to reach 0.14 mg/L?
2.Groundwater in Taupe, Arizona, initially contains 1.8 mg/L of iron(III). What must the pH be raised to in order to precipitate 0.3 mg/L of the iron? (T=25°C)
3.The two bars shown in the figure are used to support a load P. When unloaded, joint B has coordinates (0, 0). After load P is applied, joint B moves to the coordinate position (0.35 in., -0.60 in.). Assume a = 11 ft, b = 6 ft, and h = 8 ft. Determine the normal strain in each bar.
Vision Technologies Inc., is a small company that uses ultra-wideband technology to develop devices that can detect objects (including people) inside of buildings, behind walls, or below ground.
what would be better a truss with all 60 angles or a truss with a 30 60 90 angle for a bridge design what would be the best design
A manufacturing firm is considering two mutually exclusive projects. Both projects have an economic service life of one year, with no salvage value. The first cost of Project 1 is $1000 and the first cost of project 2 is $800. The Net year for each p..
Briefly explain the difference between piezometer and tensiometer with respect to the working principle, special design consideration and limitation of the instrument.
The results, listed in dollars, were as follows: New Process 51 52 55 53 54 53 Old Process 50 54 59 56 59 58 Can you conclude that the mean cost of the new method is less than that of the old method?
an increment of vertical stress of 150kpa compress the sample to a void ratio of1.43. what is the over consolidation ratio of the soil at the unloaded condition.
Determine the allowable moment about the horizontal neutral axis that a timber beam with nominal size 50 X 100 can resist without exceeding the allowable stress of 10 MPa. The dressed size is 38.1 X 88.9 mm, I = 0.00000223m^4, and S = 0.0000502 m^3.
a certain pesticide is fatal to fish fingerlings at a level of 0.5 parts per million in water. a leaking metal can
Water flows through a horizotal 45 deg reducing bend with a 36 inch. diameter upstream and a 24 inch diameter downstream, at the rate of 20 cfs under a pressure of 15 psi at the upstream end of the bend. Neglecting head loss in the bend, calculate..
if the rolling resistance is 1/100 of the weight of the car, determine the compression of each spring when the car is momentarily brought to rest spring 1 500kN/m spring 2 300kN/m and distance between springs and car 30m
Two types of Classifiers mostly used in Data mining. Other than Naive Bayes and decision trees, pick two other types of classifiers and discuss how they work
A round steel alloy bar with a diameter of 0.75 in and a gauge length of 3.0 in was subjected to tension, with the results shown in the accompanying table. using a computer spread sheet program, plot the stress-strain relationship. from the graph, de..
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