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A flat disk spins within an oil-filled enclosure. Clearances between the enclosure to both sides of the disk is 2.3 mm. The disk surface (area subject to shear) extends from radius 10mm to 90 mm. What torque is required to drive the disk at 760 rpm (rpm is revolution per minute) if the oil's absolute viscosity is 0.12 N s/m2?
A bucket full of water is to be rotated in the vertical plane. What minimum angular velocity, in rad/s, is necessary to keep the water inside if the rotating arm is 120 cm
The state highway department is considering six routes for a new highway. Listed below are the estimated construction costs, maintenance costs, and the user cost associated with each route.
At a certain location during the winter, the average air temperature is 10 degrees celcius and the net radiation is 40W/m^2 and during the summer the net radiation is 200W/m^2 and the temperature is 25 degrees celcius.
The beams support one-way slabs, 6 inches thick that span 20 feet center to center. Assume that the beams are 16 inches wide and 24 inches deep. Determine the dead load in pounds per linear foot for the beams, from the concrete structure alone.
The 50mm radius pulley A of the clothes dryer rotates with an angular acceleration of (80^(1/2)A) rad/s, where angle A is in radians. Determine its angular acceleration when t= 2 , starting from rest.
The spring loaded supporting rods AB and AC in the figure below aer used as shock absorbers for transporting fragile loads. Knowing that the elastic spring constants for the rods AB and AC are kab = 1.2 kN/m and kac = 1.5 k N/m
A backsight reading of 2.56 was obtained with rod at A and a foresight reading of 7.45 was obtained with the rod at the trial point B. If B is located 37.00 feet from the center line of a planned 50-foot wide road, is the catch point located uphi..
A water treatment llant and the water treatment plant removes calcium hardness (Ca2+) by precipitating (making) CaCO3(s). If, after establishing equilibrium with CaCO3(s), the dissolved Ca2+ concentration is 10 mg/L and the pH is 10.5.
List some of the common sources of sulphate ions in natural and industrial environments. For a given sulfate concentration, explain which of the following solutions would be the most deleterious and which would be the least deleterious to a permea..
Why is the ‘time value of money' important for the evaluation of engineering projects? Provide at least one practical example to support your view (max 2 pages)
The total phosphate concentration (TOTPO4) in a river is 3.2 mg/L as P. The pH of the river is 7.8. What are the concentrations of H2PO4- and HPO42-
To float a 160 pound man using helium balloons (assume 0.52 cubic feet per inflated balloon). How many balloons would it take? Assume density of air is 1.29 kg/cubic meter and the density of helium is 0.179 kg/cubic meter.
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