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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.
a) determine by direct integration the polar moment of inertia of the semiannular area shown with respect to point O b) Using the result of part a, determine the moments of inertia of the given area with respect to the x and y axes
A computer CPU chip consists of 50 g silicon,20g copper, and 50 g polyvinyl chloride (plastic). It heats from 15?C to 75?C as the computer is turned on. How much did the entropy increase
how many times will a piezoelectric fatigue testing machine take to conduct a fatigue test on a titanium alloy for 10^10
Sketch the flow field defined by u=3y, v=2 and derive expressions for the x and y components of acceleration. Find the magnitude of the velocity and acceleration for the point having the coordinates (3,4). Specify units in terms of L and T.
A sample of natural glacial till was taken from below the groundwater table. The water content was found to be 52%. Estimate the wet density, dry density, buoyant density, porosity and void ratio. Clearly state any necessary assumptions.
Neon gas at 50 degrees C in a vertical cylinder of diameter 150 mm has a 6 kg frictionless piston mounted. The outside pressure is 98kPa and the neon volume is 4000cm^3. Find the mass of neon.
Calculate how many chlorine atoms will be in an average neoprene chain? b) Sketch the bonding between polychloroprene chains due to sulfur linkages as neoprene is vulcanized into an elastomer. c) You decide to go swimming in Bear Lake in late Novembe..
1. an analysis of dredged sediments from a stormwater retention basin revealed a high concentration in mgkg of the
A beam is 11.5m long. There are two lifting points at 2.2m from each end of the beam. Beam self weight = 4kNm superimposed live load = 12kNm. How to determine what the bending moments are at the lifting points
If you deposit $1000 per month into an investment account that pays interest at a rate of 6% per year, compounded quarterly, how much will be in the account at the end of 5 years? There is no interperiod compounding.
Consider some hypothetical X+ - Y - ion pair for which the equilibrium interionic spacing and bonding energy values are 0.38 nm and - 6.38 eV respectively. If it is known that n in the equation has a value of 10
A lagoon with a volume of 1200 m^3 has been receiving a steady flow of a conservative waste at a rate of 100m^3/day for a long enough time to assume that steady-state conditions apply. The waste entering the lagoon has a concentration of 10mg/L.
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