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In a study it was found that 39% of the bacteria died within 9 hoursand 67% died within 20 hours. If the rate of andwer proportional to the number remaining, how long would it take to obtain a 99.9%
Prepare a preliminary design of a system to collect dust from a plant under the following conditions: Sample of Dust: 50% by wt. below 30 micrometers; 80% by wt. below 70 micrometers Density= 2.5 g/cu
A 2-kg block slides on the smooth circular path (Quadrant One of full circle, block moving left to right). If it is released from rest when theta=0 degrees, determine the force it exerts on the path
An oil-storage area was abandoned 18 years ago. Oil spilled on the ground had saturated the soil at a concentration of 400mg/Kg of soil. A fast food chain now wants to build a restaurant at the site
What pressure gradient along a streamline, dp/ds, is required to accelerate water upwards in a pipe at 0.5 m/s^2 The incline is 1:10, i.e., 1 m upward for every 10 m horizontal
Laboratory clean rooms are often kept at a slightly higher pressure than ambient pressure in order to flush out particulates and keep dust from getting in. If the pressure in such a room is equivale
find the inertia tensor about the origin for a mass of uniform density=1,inside the part of the unit sphere where x>0,y>0,and find the principal moments of inertia and the principal axes.
The force exerted by the potatoes on the frame at one side of the chair is equivalent to horizontal and vertical forces of 24 N and 84 N, respectively, at E and a force of 28 N perpendicular to memb
we have the I-section made of steel (E = 29,000 ksi) which is to be used as a column, pinned at the top, and fixed at the base. Bracing is to be added in the direction of the weak buckling axis, at
A minimum contact time of 30 mins is required to reduce the pathogen concentration from 100 pathogens/L to below 1 pathogen/L through a first order decay process. You plan on treating water at a rat
A mason contracted with a general contractor to build an exterior wall from 8-inch CMUs. The wall is 82 feet long and 8 feet high.16The mason must finish the wall in 3 days and gets paid $4 per bloc
NH4+ = N+ + NH3 pK =9.24 If the pH is 8.5 and the ammonium(NH4+) concentration in 20mg/L, calculate the ammonia(NH3) concentration in mg/L.
Water at 20 C flows in a conduit with a cross-section shaped in the form of an equilateral triangle. The cross-sectional area of the conduit is 100 sqaure meters and e=0.045 mm.
a simple beam with a pin support at A on the left side of my beam, and a roller connection 20 feet away on the far right side of the beam labeled C, with the midspan point (10 feet) labeled B.
The maximum wind pressure on the traffic sign is 200 kg/m2. The maximum allowable shear stress is 350 kg/cm2. Design the traffic pole (only vertical element) against torsion knowing that angle of tw
A layer of normally consolidated clay has been filled with 2m of gravel at a unit weight of 17kN/m3 for a long period of time and the settlement of the clay layer monitored giving a total final sett
At a point in a saturated normally consolidated clay layer the soil is subject to an in-situ vertical effective stress of 50kPa. The soil at the point has a moisture content of 44% and a compression
A soil sample with specific gravity of solids 2.70 has a mass specific gravity of 1.84 Assuming the soil to be perfectly dry,Determine the void ratio.
FOR WHAT REASON WOULD YOU NEED TO USE DARCY'S LAW IN THE FOELD RATHER THAN IN THE LABORATORY
THE WATER TABLE OF A SATURATED , UNCONFINED AQUIFER COINCIDES WITH THE LAND SURFACE. THE AQUIFER IS 52 FT THICK AND THE MATERIAL HAS A UNIT WET WEIGHT OF 135 LB/FT^3.
Water seeps vertically downward from the bottom of a lake through a uniform material to an aquifer below. The discharge is 0.005 ft^3/s through a 1 ft^2 area of the lake bottom.
The bottom of piezometers A and B are on the same flow line and 1000 m apart. The bottom of piezometer A is at 130 m and its water level is 160 m. The bottom of piezometer B is at 100 m and the wate
Flow occur throught a sand-filled pipe with a cross-sectional area of 60 cm^2. If K is 10^-3 cm/s and the gradient is 0.01, what is the discharge from the pipe
A river flows towards a lake with a velocity of 3 m/s and rate of 500 m3/s at a location of 90 m above the lake surface. Determine the total power generation potential of the river at that location.
The article "Statistical Evidence of Discrimination" (Journal of the American Statistical Association, 1982, pp.773-783) reported that, prior to 1965 in a southern state, 25% of those eligible to se