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1.The pH of tap water might be adjusted to the 8 to 9 range to reduce the potential for corrosion of metal pipes in the water distribution system. If the pH were adjusted to 8, what percentage of 1 mg/L free chlorine residual would remain in the form of HOCl?
2.An inspector is paid $10/hr and can sort 10 rings/min. Assume that a new method allows her to sort 20 rings/min but costs $500 to implement. Is it worth implementing the new method for a batch of 50,000 rings? At what point does the new method pay off?
Suppose that from the past experience a professor knows that the test score of a student taking his final examination is arandom variable with mean 70 and standarddeviation 85
The 30-Mg freight car A and 20-Mg freight car are moving towards each other with the velocities of VA= 20km/h and VB=10 km/h. A spring mounted on A has k=3 MN/m Determine the maximum compression of the spring mounted on car A.
What is the contact time (min) required to achieve a log-3 deactivation of Giardia in water of 10 °C temperature, at pH 7, if the chlorine concentration is 2.2 mg/L?
With all the developments and improvements to the GNSS system over the years, what is one important facet of the system that has not improved
When X exceeds some critical distance the slider will "lock" and no longer move regardless of the force applied. If the coefficient of friction for the slider bearing is 0.1, what is the critical value for X in inches
Using the following assumptions, determine the solids retention time, the cell wastage flow rate, and the return sludge flow ratefor the Jambalaya shrimp processing plant WWTP
Three point loads 10,000, 7500 and 9000 kN act in line 5m apart near the surface of a soil mass. Calculate the vertical stress at a depth of 4m vertically below the centre (7500kN) load.
Discuss the differences between how engineers see themselves and how the public sees engineers
The velocity along a pathline is given by V (m/s) = s^2 x t^(1/2) where s is in meters and t is in seconds. The radius of curvature is 0.5 m. Evaluate the acceleration along and normal to the path at s = 2m and t = 0.5 seconds.
The fluid pressure in the screen of a piezometer in a saline aquifer is 7.688 x 10^5 N/m^2. The fluid density is 1055 kg/m^3 and the temperature is 14 degrees C. The elevation of the piezometer screen is 45.9 m above sea level.
When the Mars Exploration Rover was fully assembled, its mass was 180 kg. The acceleration due to gravity at the surface of Mars is 3.68 m/s2. a) What was the rover's weight when it was at sea level on Earth
At the proportional limit, a 32-mm-thick by 87-mm-wide bar elongates 10.2 mm under an axial load of 532 kN. The bar is 2.4 m long. Poisson%u2019s ratio, , for the material is 0.27.
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