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1.Aluminum is suspected of causing adverse ecological effects inacidified lakes. Given that the solubility product for aluminumhydroxide, Al(OH)3 is 10-32.9 , compare themolar concentration of Al3+ in a lake with a pH of 7.5versus an acidified lake with a pH of 5.5.
2.Block B rests on a smooth surface. block A is on top of bock B. If the coefficients of static and kinetic friction beween A and B are μ_s=.4 and μ_k=.3, determine the acceleration of each block if someone pushes horizontally on block A with a force a) F=60 lb and b) F=50 lb
50 kmol per hour of air is compressed from p1 = 1.2 bar to P2 = 6.0 bar in a steady-flow compressor. Delivered mechanical power is 98.8KW. Temperature and velocities are: T1= 300K T2= 520K u1= 10m s^-1 u2= 3.5m s^-1
Why is the anchorage capacity of a standard hook not increased by extending the bar well beyond the end of the hook
A machine has an initial cost of $10,000. Its market value declines by 20% annually. The repair costs are covered by a warranty in year 1, and then they increase $600 per year. The firm's MARR is 15%.
A runs slope a distance of 156.777 m from one point to another point at a rate of +1.5%. What is the corresponding horizontal distance between the points?
Assuming that the velocity variation within the main channel and the floodplain subsections is much smaller than the change in mean velocities between subsections, find the value of the kinetic energy correction coefficient.
Calculate the primary consolidation settlement for the CH layer, assuming that it is normally consolidated with a water content of 70% and a compression index of 0.25.
Assume the rate constant for BOD decay is 0.2 d^-1, the mean velocity of the stream is 0.5 m s^-1, and the initial concentration is 100 mg L^-1 at x=0. Plot the resulting concentration with downstream distance x in km.
What is the force of the water on a spillway whose upstream depth is 1.2m and whose downstream depth is 0.2m. The width of the spillway is 3m.
determine a dollar amount on December 31st , 2011 FOR $1000 equal payments made at the end of each of the previous 7 years including the current year. use an effective interest rate of 10% compounded annually.
A fully loaded, ocean going container ship is just stable about its longitudinal axis (roll). The ship has a total weight of 155,000 tons, length = 1,600 feet and a beam = 150 feet (assume that it is the shape of a rectangular box). Calculate the ..
The cash flow of alternatives J and K is shown below. If the interest rate is 10% per year, which alternative should be selected. Perform a Present Worth analysis.
If a student mixes 500 ml of a solution containing 50 mg/l of CaCl2 with 500 ml of containing 50 mg/l of NaHco3 what will be the hardness and alkalinity of the mixture of mg/l as CaCo3
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