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You have taken a job at a metal plating plant, and some of the metals you work with contain arsenic as an impurity. The heated metals give off arsenic vapors, which create an average concentration of arsenic of 0.00002 mg/m3 in the air in the workplace.
a. What is your increased risk of cancer if you continue to work in this job for your entire career? (Assume a 45-y career.)
b. There are about 220,000 workers in the United States in metal casting plants similar to the one in which you work. How many worker deaths above the background cancer rate would be expected due to their occupation?
c. Suppose your workplace air also contains mercury in the air with an average concentration of 0.0001 mg/mg3. Is this an acceptable risk?
A loose, uncompacted sand fill is 2 m in depth and has a relative density of 40%. Laboratory tests indicate that the minimum and maximum void ratio of the sand are 0.46 and 0.90, respectively.
A car has the following characteristics: weight = 18000 N; cross-sectional area = 2.5 m^2, drag coefficient = 0.5; rolling friction coefficient = 0.02. The energy content of gasoline is 3.5E10^7 Joules/Liter.
The area is about 100,000 ha, the ground water pumping about 500 million m3 per year, and the water table drop about 3 m per year. Assuming no replenishment, what is the specific yield of the aquifer material
A 600 MWe power plant has an efficiency of 36% with 15% of the waste heat being released to the atmosphere as stack heat and the other 85% taken away in the cooling water.
you fill a 2-cubic wheelbarrow to the top with aggregate. if the specific gravity of the aggregate is 2.548, and 18% of the aggregate is void spaces, how much does the aggregate in the wheelbarrow weight
Determine the deflection of the right end of the pointer and the maximum deflection of the beam.
How can statistics of a product's dimensions be used to assess the quality of the product?
Calculate the approximate design load due to concrete pressurefor a wall fromwork 9ft high to be poured at 6.5ft per hour at atemperture of 68 degree f.
The New Jersey Surety Association, in various documented publications discusses the Surety's relationship with their clients, the best way to better know your Surety and a brief overview of why the Construction Business can fail.
An inventor claims that an engine produces 120 kw with a fuel consumption of 20 kg/h. The energy content of the fuel is 36,00 kJ/kg. The energy is received at a mean temperature of 500C and rejected at a mean temo of 50 C.
The bend lies in a horizontal plane, and water enters from the west and leaves toward the north. Assuming no drop in pressure, what is the magnitude and direction of the resultant force acting on the bend
A satellite is launched 600 km from the surface of the earth, with an initial velocity of 8333.3 m./s, acting parallel to the tangent of the surface of the earth.
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