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In 1908, H. Chick reported an experiment in which he disinfected anthrax spores with a 5% solution of phenol. The results of his experiment are tabulated below. Assuming the experiment was conducted in a completely-mixed batch reactor, determine the decay rate constant for the die-off of anthrax.
Concentration of survivors (number/mL) Time (min)
398 0251 30158 60
List the possible routes by which humans can be exposed to toxic chemicals in the following media:
GroundwaterAir
the velocity of a particle is given by the relation v=100-10x, where v is expressed in meters per second and x in meters. Knowing that x=0 at t=0, determine (a) the distance traveled before the particle comes to rest
a rainstrom lasts for 90 min at a constant intensity of 3.2 in/hr over a five acre parking lot. a detention pond is used to store all of the runoff from the parking lot and cannot be deeper than 2 ft.
THE HOME DEPOT IN RED HOOK ,BROOKLYN IS LOOKING TO RENOVATE THEIR STEEL ROOF TRUSS.YOU HAVE BEEN ASKED TO DETERMINE THE CENTROID,MOMENT OF INERTIA,SECTION MODULUS AND RADIUS OF GYRATION OF THE DOUBLE ANGLE.
A wastewater treatment plant has a flow of 35,000 m3/day. Calculate the mass of sludge wasted each day (QwXw, expressed in kg/day) for an activated-sludge system operated at a solids retention time (SRT) of 5 days
The flowrate (q) per unit lenght (ft^2/s) over the spillway shown below is a fuction of the upstream heah H, the acceleration due to gravity g, and the spillway height P.
you are designing a highway to AASHTO guidelines on rolling terrain where the design speed will be 65 mi/hr. At one section, a +1.25% grade and a -2.25% grade must be connected with and equal tangent vertical curve.
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.
The ball at A is kicked such that theta=30 degrees. If it strikes the ground at B having coordinates x=15 ft, y= -9ft, determine the speed at which it is kicked and the speed at which it strikes the ground.
A soil sample is obtained by pushing a 16 inch long tube into the side of a pit. The tube has an inside diameter of 3 inch and weighs 1.8 lb. The soil in the tube is trimmed so that its ends are flush with the ends of the tube.
An old occupational hygiene rule of thumb is that a 10 micrometer (micron) silica particle settles at a rare of 1 ft/min (0.5 cm/s). What is the true settling velocity for such a particle? The density of silica is 2600 kg/cubic meter (2.6 g/cubic ..
Need to prepare the CAD drawings
Assuming that silt is equivalent to a liquid having a density of 1760 kg/m3, determine the overturning moment of silt and water about point A.
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