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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 0
251 30
158 60
List the possible routes by which humans can be exposed to toxic chemicals in the following media:
Groundwater
Air
a concrete box girder bridge has the rectangular x-section. the box is prismatic and considered thin-walled. it span is
A gas occupise 250 ml and it's pressure is 550mm Hg @ 254C how many moles of gas are in this sample? (convert mm Hg to atm).
Assume a time to peak of 15 minutes and the unit peak discharge is 7.0 cfs/in, using the Gamma Function Unit Hydrograph what is the unit discharge at 20 minutes
The power output of the turbine is just 0.1 kW. If the process is adiabatic and steady, what is the required flow rate of air through the turbine if the exit state is 100 kPa and - 53 C.
If arm OA rotates with a constant clockwise angular velocity of theta dot(first dirivatie)=1.5 rad/s. determine the force arm OA exerts on the smooth 4-lb cylinder B when theta=45 degrees.
The flow is assumed to be laminar and the film thickness, H, constant. Using a coordinate system located on the plate at the surface of the pool, complete the following: a. Dram and sketch the system. Include coordinate system in your sketch.
A concrete mix with a 3in slump, w/c ratio of .5, and sand with a fineness modulus of 2.4 contains 1700lb/yd3 of coarse aggregate. Compute the required weight of coarse aggregate per cubic yard.
a) Determine the total shortening of the pile in terms of F, L, A, and E; b) If F=96 kips, L=40 ft., A=100in2, and E=1.5 x 106 psi, how much does such a pile shorten?
write a function that calculates the average of a set of numbers. name the function calculate_average. the function should accept one input which is an array of numbers.
A gas bubble is formed at the tip of a small tube which is completely immersed in a large body of liquid. The bubble remains in contact with the open end of the tube in a way that allows us to control the pressure P inside the bubble.
The scale of a spring balance reading from 0 to 235 N has a length of 13.0 cm. A fish hanging from the bottom of the spring oscillates....
A colonist spaceship is a cylinder 3000m long and has a radius of 300m. The ship is spinning so the colonists experience gravity on the 'barrel'. No one lives on the end.
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