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A person may demonstrate observable effects on the central nervous system when exposed to carbon monoxide at a concentration of 50 ppm, may lose consciousness at a concentration of 250 ppm, and may die at a concentration of 750 ppm. A "typical" urban environment produces carbon monoxide at a rate of 1.2 L/m2-hr. If a temperature inversion forms over the city at a height of 0.70 km, how long will it take the carbon monoxide concentration to reach 50 ppm if the wind velocity is zero? If the wind velocity is 1 m/s, what steady-state concentration of CO will be observed? Assume that the city is approximately square, 20 km on each side.
If = 300 N , determine the required minimum compression in the spring so that the wedge will not move to the right. Neglect the weight of A and B. The coefficient of static friction for all contacting surfaces is .2 Neglect friction at the rollers.
Knowing that portion AC of the rope lies in a plane parallel to the xy plane and that the magnitude of the tension T in the rope is 62 lb, determine the moment about O of the resultant force exerted on the pulley by the rope.
A trapezoidal channel has a bottom width of 5 feet, a slideslope (horizontal:vertical) of 2, and a depth of flow of 4 feet. The elevation of the channel bottom drops 2 feet every 1000 feet of horizontal distance traveled.
How do you calculate the critical depth of a circular concrete pipe with a diameter of 42 inches, a Manning's Number of .014, a slope of .025% and a flow rate of 10 CFS (cubic feet per second). The radius is 3.55 and normal depth is 25 inches
the weight of a sample of coarse aggregate was measured under various conditions with the following results: oven-dry weight in air 1076.3 g air-dry weight in air 1083.3 gsaturated-surface-dry weight in air 1089.2 g
A motorist traveling at 55 mph on an expressway intends to exit from the expressway using an exit ramp with a maximum allowable speed of 30 mph. At what point on the expressway should the motorist step on her brakes in order to reduce her speed to th..
The Senate hearing committee demanded thecorporation’s officers to providecredible
If a tank contains 1000 kg of the dilute acid and the concentrated acid is added at a rate of 100 kg/min, how long will it take to bring dilute acid strength to 75 wt% H2PO4? What will be the final chemical composition and weight of the final mixture..
1.an undisturbed soil sample has a dry unit weight of 112 pcf with a specific gravity of solids equals to 2.68.awhat is
Calculate the ozone column amount in DU, corresponding to the pressure profile and ozone concentrations given above. Recall Avogadro's number, NA = 6.0 × 1023 molecules per mole, from which one can calculate [O3]= ..
A turbine discharges water at 0.4 m3/s under a head of 10.50 m and with an overall efficiency of 80 %. determine what is The power developed.
Develop a preliminary design, including flow rates, pipe sizes, and pipe slopes for a trunk sewer to be laid in the development shown in the accompanying figure from 6th to 1st Streets along Peavy Avenue.
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