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1.A 10 N weight is supported by a weightless cable where portion AB of the cable is horizontal. The coefficients of static and kinetic friction are 0.5.
a) Determine the value of P so that downward motion of the 10 N weight is impending.
b.)If P=3 N, determine the force in portion CD of the cable. Is the system in equilibrium or is there motion
2.A long concrete retaining wall with 2.4X10^3 kg/m^3 density is used to support a soil embankment. Assuming the soil behaves as a fluid with 1.5X10^3 kg/m^3 density, determine the required coefficient of friction so the wall does not slip along its base, and determine if the wall is safe from tipping
At the end of 15 years, the first motor will have a salvage value of $50 and the second motor will have a salvage value of $100. consider the MARR to be 8%. (note : 1HP=0.7457 kw). Determine which motor should be installed based on the PW criterio..
1. a tensiometer is used to measure a compacted soil in the field that has a matric suction of 200 kpa under
A sample of dry soil is mixed uniformly with 16 wt% water and then compacted into a cylindrical mold in the laboratory. The volume of moist soil is 1x10-3 m3 and its mass is equal to 1.60 kg.
A lagoon with volume 1200 m^3 has been receiving a steady flow of a conservative waste at a rate of 100m^3/day for a long enough time to assume that steady-state conditions apply
Influent sample collected from a wastewater treatment plant was analyzed for various solids concentrations. Results indicated concentrations of Total Volatile Solids (TVS)
Two hemispheric shells are perfectly sealed together, and the internal pressure is reduced to 43 % of atmospheric pressure. The inner radius is 10.5 cm, and the outer radius is 10.75 cm. The seal is located halfway between the inner and outer radi..
A piston-cylinder device contains 0.85 kg R-134a at 263K. The piston is free to move and has a mass of 12 kg and diameter of 25 cm. The atmospheric pressure is 98 kPa. Heat is added to the cylinder until the R-134 temperature = 10 o C.
laminar flow of a real fluid down a cylindrical pipe of constant radius R. Poiseuille showed that the velocity profile was parabolic and given by u(r)=c(R^2-r^2), where r is the radial coordinate and c is a dimensional constant.
Using Darcy's Law, calculate the quantity of groundwater (L/day), the seepage velocity (m/s), and the contaminant loading (Kg/day) to the river (assuming no retardation) for the following scenario. Be sure to include both a plane view and cross-se..
Treatment plant was designed for 9 MGD. It is currently processing 13 MGD. Your task is to assess the expected treatment performance of the primary clarifiers. There are two clarifiers 45 feet in diameter.
The Pomdeterra wastewater treatment plant produces a thick sludge that has a suspended solids concentration of 3.8%. They are investigating a filter press that will yield a solids concentration of 24%.
A 40 kg sheave a OF RADIUS R=350 mm. and cenral radiusof gyration k=250 mm carries a 160 kg load b and is suspended by a cable and a spring of modulus k=1.2 kN/m.
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