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Presedimentation can reduce the suspended solids concentration of raw river water from 500 mg/L to 200 mg/L. How many pounds of dry solids does this represent per million gallons? If the specific gravity of these solids is 2.60 and the sludge removed has a solids concentration of 2%, what volume of sludge must be removed every week at a design flow of 4mgd?
The symmetrical beam shown is made of a material for which the allowable stress is 40 MPa in tension and 100 MPa in compression. Locate its centroid. Calculate the centroidal moment of inertia that will resist the bending moment.
The acceleration of a particle traveling along a straight line is A= (0.02e^t) m/s^2, where t is in seconds. If v=0, s=0 when t = 0, determine the velocity and acceleration of the particle at S= 4m
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.
Which of the following is not a force requiring lateral bracing in platform building?
If this refrigerator is to operate in an environment at 30°C, what is the minimum pressure to which the refrigerant should be compressed? Why?
On average, is an electron farther away from the nucleus when it isoccupying a 2p orbital in hydrogen than when it is occupying a 2sorbital? Justify by calculating the average distances
An aggregate blend is composed of 53% coarse aggregate by weight (sp. gr. 2.702), 43% fine aggregate (sp. gr. 2.621), and 4% filler (sp. gr. 2.779)/
If the free surface at a distance from the axis of the vortex, which is sufficient for its effect to be negligible, is 180 mm above datum, what will be the height above datum of a point B on the free surface at a radius of 100 mm
Using Rate of Return Analysis, determine the most economical alternative below. Assume a minimum attractive rate of return of 6%, and a 5-year life with no salvage value for each. The alternatives are mutually exclusive
The mass flow rate of steam into a steam turbine is 5 kg/s . The turbine has a heat loss of 5 kj/s. if the velocity of the refrigerant is to be limited to 2 m/s, what is the minumum allowable pipe diamter
A mixture of 1 mol of H2 and 1 mol of Ar is heated at a constant pressure of 1 atm until 15 percent of H2 dissociates into monatomic hydrogen (H).
In a football game, a receiver is standing still, having just caught a pass. Before he can move, a tackler, running at a velocity of +3.1 m/s, grabs him. The tackler holds onto the receiver, and the two move off together with a velocity of +1.6 m/s
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