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A new concrete mix is being designed to provide adequate compressive strength for concrete blocks. The specification for a particular application calls for the blocks to have a mean compressive strength greater than 1350 kPa. A sample of 100 blocks is produced and tested. Their mean compressive strength is 1356 kPa and their standard deviation is 70 kPa.
a.) What is the p-valueb.) Find the critical value of the test statistic
The break up of a liquid jet into droplets of diameter d depends on the jet diameter D, the jet velocity V, viscosity Mu, density rho,and surface tension sigma.
The grains of wood in the board make an angle of 20 degrees with the horizontal as shown. Determine the normal and shear stresses that act perpendicular and parallel to the grains if the board is subjected to an axial load of 250 N.(Dimensions l=3..
A concrete mix with a 3-inch slump, w/c ratio of 0.50, and sand with a fineness modulus of 2.4 contains 1700 lb/yd^3 of coarse aggregate. Compute the required weight of coarse aggregate per cubic yard.
in an air standard otto cycle , the air at the beginning of the compression stroke is at 95 kpa and 22c ,and the cylinder volume is 0.0028 m^3 . the compression ratio is 9 and 4.3 kj are added during the heat addition process
Thomas Friedman's bestseller, The World is Flat, says that the world has been, in his words, "flattened" or leveled which increases accessibility and competition worldwide. What does this mean for engineering and for managers who deal with enginee..
Consider the design of wastewater treatment plant for a community wiyh average daily and peak hourly wastewater design flows of 2.0 mgd. The raw sewage has an average of 230 mg/l BOD5 and 260 mg/l of suspended solids.
What is the runoff coefficient in a basin located near the middle of the climatic spectrum, with annual precipitation P = 32 in, ecosystem evapotranspiration ET = 22 in, and baseflow U = 3 in
At a specified point on a highway, vehicles are known to arrive according to a poisson process. Vehicles are counted in 20 second intervals, and vehicle counts are taken in 120 of these time intervals.
If a 96-inch brick sewer (n = 0.015) is laid on a slope of 0.01% is set to be rehabilitated with GIPL (n = 0.01) that will need 2-inches all around it. How much more flow, in cfs will be attained with this project
a car is traveling at sea level at 78 mi/h on a 4% upgrade before the driver sees a fallen tree in the roadway 150 feet away. the coefficient of road adhesion is 0.8. The car weighs 2700 lbs, has a drag coefficiant of 0.35, a frontal area of 18 ft..
The probability that a new car battery functions for over 10,000 miles is .8, the probability that it functions for over 20,000 miles is .4, and the probability that it functions over 30,000 miles is .1. If a new battery is still working after 10,..
Water is flowing at a depth of 10 ft with a velocity of 10 ft/s in a channel of rectangular section. Find the depth and change in water surface elevation caused by a smooth upward step in the channel bottom of 1 ft.
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