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A hole is drilled in an aluminum plate with a steel drill bit whose diameter is 6.245 cm at 20 degrees Celsius. In the process of drilling, the temperatures of the drill bit and plate rise to 168 degrees Celsius. What is the diameter of the hole in the aluminum plate when it has cooled back down to 20 degrees Celsius.
After the Chernobyl accident, the concentration of 137Cs in milk was proportional to the concentration of 137Cs in the glass that cow consumed. The concentration in the grass was, in turn, proportional to the concentration in the soil.
A rectangular steel bar shown is fixed at the right end has a thickness of 20 mm. The temperature is increased by 20C and a force F is applied as shown midway along the bar. Use the properties E=200 GPa, a=12(10^-6)/C.
Assume the settling tank behaves like an ideal sedimentation tank, what percentage of removal should be expected for particles with a settling velocity of 0.002 m/sec
The only losses of total phosphorus for the lake are settling and fluching throught the lake's outlet. Assume the outflow rate is 212 km^2/year and the sediment area is 10,500 km^2.
After compaction the void ratio is reduced to 0.60. Determine: (a) Dry and moist unit weights before and after compaction (b) Degree of saturation after compaction.
At one point in a pipeline, the water's speed is 3.00 m/s and the gauge pressure is 4.00×10^4 Pa. Find the gauge pressure at a second point in the line 11.0 m lower than the first if the pipe diameter at the second point is twice that at the first..
A rectangular channel 5 m wide carries a discharge of 10 m^3/s at a uniform depth of 3 m. The channel is running on a slope of 0.0025 m/m. Estimate wall shear stress and friction velocity. Assume the density of flowing water as 1000 kg/m^3.
a flat steel plate of 10mm thickness varies in width from 150mm to 300mm over a length of 1.5m. Determine the elongation of the plate under a tensile load of 250KN
You fill a 2-cubic foot wheelbarrow to the top with aggregate. if the specific gravity of the aggregate is 2.548 and 18% of the aggregate is void spaces, how much does the aggregate in the wheelbarrow weight?
use zero through forth order taylor series expansions to predict f(2.5) for f(x) = ln x using a base point at x=1. compute the true percent relative error for each approximation. discuss the meaning of the results.
Briefly describe electron and hole motions in a p-n junction for forward and reverse biases;
A stone A is dropped from rest down a well, and in 1 second another stone B is dropped from rest. Determine the distance between the stones another second later.
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