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A soil sample weights 27.5 lb and has a volume of 0.220 ft3 (cubic feet), a moisture content of 10.2 % and a specific gravity of solids of 2.65. Compute the unit weight, dry unit weight, degree of saturation, void ratio and porosity.
A two stage crushing operation feeds 0.6 m diameter ore into a primary crusher at a rate of 25mt/hr. 80% of the ore feeds through an 0.2m screen into a secondary crusher. 65% of the ore from the secondary crusher comes out of a 50mm screen.
A contractor has installed a silt fence around an area that is semi-circular and level to prevent soil from the construction site entering nearby streams. The diameter of the semi-circle is 1000 feet.
The dissolved oxygen of sample water is 1.5 mg/L. At 25 C, the dissolved oxygen of the dilution water is 8.25 mg/L. You are told the BOD5 of the sample is 130 mg/L. You have a target final dissolved oxygen of 3.0 mg/L (give yourself some leeway).
to achive a specific level of disinfection a water treatment plant operator determines the" Ct" value 180mg min/l is necessary with units for disinfectant concentration C in mg/l and disinfectant contact time t in minutes
Assuming approximately 19,296 data points can be held in memory, with a 21X Datalogger (CR23X Micrologger), capturing battery voltage; panel temperature; 2 thermocouples
to apply shock loading to an artillery shell, a 20kg pendulum A is released from a know height and strikes impactor B at a known velocity v (theta). impactor B then strikes the 1 kg artillery shell C.
The pressure inside the cylinder is 50 atm and temperature is 298o K. Provide your engineering judgement (with calculations) to justify or not justify the shipment of the cylinder.
A steel plate 5/16" thick is embedded in a horizontal concrete slab and is used to anchor a high-strength cable as shown. The diameter of the hole in the plate is 3/4", the ultimate strength of the steel used is 36 ksi
The tunnel is supplied with 1500 kg dry air/h at 50°C and 10% RH, and the air leaves at 25°C in equilibrium with the product at 50% RH. Determine the moisture content of product leaving the dryer and the final water activity.
If the coefficient of static friction between the 50-lb roller and the ground is 0.25, determine the max force P that can be applied to the handle, so that the roller rolls on the ground without slipping.
The storativity of the Jordan Aquifer (a regional confined aquifer) is 5 x 10-4 and the porosity is 0.3. The thickness of the aquifer is 200 ft. The Jordan has been pumped for several decades, yet remains fully saturated.
Straight pipe, pump head=100 ft, pipe diameter=4inches, velocity is 10 ft/sec, no elevation changes. Water at 20C. What is the length of the smooth pipe
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