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To study the effect of curing temperature on shear strength of a certain rubber compound, 80 specimens were cured at 150oC and 95 were cured at 130oC. The specimens cured at 150oC had an average shear strength of 620 psi, with a standard deviation of 20 psi. Those cured at 130oC had an average shear strength of 750 psi, with a standard deviation of 30 psi. Determine a 95% confidence interval for the difference between the mean shear strength of specimens cured at the two temperatures.
determine the length of an interval of time such that the probability of at least one call in the interval is 0.90
a poorly designed 100 ft long homogeneous barge runs on diesel fuel, the fuel is held in a 2' tall trapezoidal tank of the same length as the barge. and is located at the bottom of the barge hull.
Calculate the BOD loading and days of winter storage available between the 0.6 and 1.5 m depths, assuming a daily water loss of 0.30 cm by evaporation and seepage.
KNowing that after being snugly fitted, the nut at C is tightened one full turn, determine (a) the tension in rod CD, (b) the deflection of point C of the rigid member ABC
Two reservoirs are connected with a 30" diameter pipe with a length of 19,680 ft. The water surface elevation in the upper reservoir of the upper reservoir is 984 ft, lower reservoir 886 ft and the elevation at the midpoint is 918 ft.
Suppose you are told that a process must achieve a 2.7 log removal of Giardia cysts. What does that mean in terms of % remaining and % removal
A lake has a carrying capacity of 12,000 fish. At the current level of fishing, 3,000 fish per year are taken with the catch uniformly distributed throughout the year.
The development of complex algorithms that can mine mounds of data that have been collected from people and digital devices have led to the adoption of data mining by most businesses as a means of understanding their customers better than before
Find the nominal flexural strength from part (d.) to the service capacity from part (c.). e.) Compute the ratio of the flexural strength from part (d) to the service capacity from part (c).
You heat 250 ml of tap water from 10 degree celcius to 100 degree celcius in 2 minutes using a microwave oven operating at 2.5 GHz. a). What is the wavelength of this electromagnetic radiation
an insulated tank is evacuated. Air from the atmosphere at 12 psia and 70 degrees farenheight is allowed to flow into the 100 cubic foot tank. What is the final temp and the final mass of air in the tank just after flow ceases.
A water storage tank is on the roof of a factory building & the surface of the water is 50 ft above the floor of the factory. if a pipe connects the storage tank to the floor level & the pipe is full of static water
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