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Calculate the number-average molecular weight of a random nitrile rubber [poly(acrylonitrile- butadiene) copolymer] in which the fraction of butadiene repeat unit is 0.30
A POTW (a.k.a. waste water plant) 1.0 m^3/s of treated effluent having an ultimate BOD of 30mg/L and DO = 2 mg/L into a stream that has a flow of 8 m^3/s, a BOD = 5.0 mg/L and DO = 9 mg/L.
Estimate the amount of Ca(OH)2(s) leached from concrete during a one-year period by precipitation. Assume that the area receives 40 in/yr of precipitation which is in equilibrium with PCO2= 10^-3.5
calculate the X, Y and Z coordinates of point B for radial readings taken to B from occupied station A, if the backsight azimuth at A is 25°32'48", the elevation of A = 610.098 m, and hi = 1.45
You find a spool of pure copper wire while snooping through your brother's purse. The wire has a diameter of 0.3 millimeter and a length of 200 meters. A) Derive a formula for the resistance of the
It is desired to produce an iron-carbon allow that has a minimum hardness of 200 HB and a minimum ductility of 35% RA. Is such an ally possible. If so what its composition and microstructure
Consider a steel containing 0.6% carbon and 10% chromium. Estimate the eutectoid temperature and concentration. What is the proeutectoid phase
A tied short column of square cross-section is subjected to a factored axial load of 2500 kN and a factored bending moment of 175 kN.m. Use a 40 mm clear cover to the ties and a 20 mm maximum aggreg
Assuming that the coefficient of static friction µs is the same at A and B, determine the smallest value of µs for which equilibrium is maintained. The weight force acts at the center of
a) which measurement of the velocity of the ball do you think is the more dependable the projectile method or the pendulum method. why b) which measurement contributes to large amount of error
A pendulum consists of a slender rod, AB, of weight Wr= 8.60 lb and a wooden sphere of weight Ws= 21.7 lb .(Figure 1) The length of the rod is d = 7.70 ft and the radius of the sphere is R = 0.500 f
How long would it take to fill a 30 yd^3 packer truck that compresses waste to 750 lb/yd^3 if it travels 100 ft between stops at an average of 5mph and it takes 1 minute to load 200 lb of waste at e
Calculate the uniform flow rate in an earth-lined (n = 0.020) trapezoidal canal having bottom width 3 m, sides sloping 1V : 2H, laid on a slope of 0.0001, and having depth of 1.8 m.
One method used to store energy during times of low demand is by pumping water uphill into a reservoir. When energy demand exceeds the output produced by power plants, the water is released, moves d
What are the best dimensions for a trapezoidal canal having a side slopes of 1V : 3H and n = 0.020, if it is to carry 40 m^3/s uniformly on a slope of 0.009.
Determine from curve (a) critical depth (b) the maximum flow rate (c) the flow rate at a depth of 2.4 m and (d) the depths at which flow rate of 28.3 m^3/s may exist and the flow conditions at these
A rectangular channel of 20 f t width and having n = 0:017 carries flow of 800 f t^3/s. Calculate (a) critical depth (b) the minimum speci c energy (c) the speci c energy when depth of flow is 7 f t
What percent increase in shear force would be experience on the flat sides of a 40 ft long truck trailer as the truck speed increases from 65 mph to 75 mph. Kinematic viscosity of the air is 1.6x10^
Determine the number of gallons of paint needed to paint the outside surface of the water-supply tank, which consists of a hemispherical bottom, cylindrical sides, and a conical top. Each gallon of
Find the probability that in a sample of 100 bulbs, (a) 0 bulbs will be defective (b) 1 bulbs will be defective (c) 2 bulbs will be defective (d) 3 bulbs will be defective (e) 4 bulbs will be defect
The mean grade on a final examination was 72, and the standard deviation was 9. The top 10% of the students are to receive A's. What is the minimum grade a student must get in order to receive an A
how many students have heights, (a) Greater than 72 inches (b) Less than or equal to 64 inches (c) Between 65 and 71 inches inclusive (d) equal to 68 inches * Assume the measurements to be recorded
Above the water table the soil mass unit weight is 16 kN/m^2. Below the water table the saturated unit weight is 19.5kN/m^2. The maximum column load is 330,000 lbs. Recommend the number and depth of
Soil engineers hypothesize that the share of limestone in Austin's soils is the same as that in San Antonio soils. They take 100 bore holes in each region, with 70 showing limestone in Austin and 60