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What is the maximum length of trench that can be excavated by hand economically rather than by a trenching machine. It will cost $900.00 to transport a trenching machine to the job and back to the storage yard. The trenching machine can excavate 265 linear feet per hour. The trench is 3 ft wide and 4 feet deep. Assume that 4 laborers plus a foreman will be used. Assume a 40-min hour for the hand labor operation and a 45-min hour for the trenching machine. The following cost information applies:
Trenching machine $42.82/hr
Trencher operator $20.45/hr
Laborers,each $16.65/hr
Foreman $28.30/hr
A closed, rigid container with a volume of 1 m3 contains H2O initially at a pressure of 800 kPa and temperature of 500 C. Heat transfer occurs to the surroundings. At what temperature, in deg C, will condensation start to occur
Water flows through a pipe at 14cfs. At a point where the pipe diameter is 18in. the pressure is 30 psi; at a second point, further along the flow path and 2 ft lower than the first, the diameter is 9in. and the pressure is 18psi.
A coal mine's entry and breakthrough centers are set at 60ft with 20ft-wide openings. The 6ft coal seam lies 1,000ft below the suface, and the specific gravity of the overburden is 2.4. If the compressive strength of 4in.
A particular crest vertical curve has long been criticized as being unsafe. Its length is 400 ft. The prevailing speed on the crest vertical curve is 50 mph. In its present condition, its tangent grades are +2% and -3%.
what is the maximum load that may be applied to a specimen with a cross sectional area of 130 mm^2 without plastic deformation.
A soil sample with a volume of 0.5 m3, dry unit weight = 18.1 kN/m3, water content = 5%, and Specific Gravity of the soil solids = 2.68. Calculate weight of water added to reach 90% saturation (in kilograms)?
You have determined that a 0.5 ppm concentration of copper sulfate should be applied to a lake to control the growth. The lake volume is 50 ac-ft. How many pounds of copper sulfate should be dissolved in the lake
A traffic engineer is trying to design a left turn bay on an EB approach to an intersection. The signal timing for left turns will have 10 seconds of "left turn only" green time and 50 seconds of red time each signal cycle.
A pump having the characteristics given ( N=2133.5 rpm, n=35.6 rps, D=37.1 cm) pumps water at 25 degree C from a reservoir at an elevation of 366 m to a reservoir at an elevation of 450 m through a 36 cm steel pipe
The aluminum block has a rectangular cross section and is subjected to an axial compressive force of 8kip. If the 1.5-in side changed its length to 1.500132 in., Determine Poisson's ratio and the new length of the 2-in side.
A lunar module weights 1500 kg on earth where g = 9.75 mps2. On the surface of the moon where g = 1.70 mps2, what will be the force in Newtons required to accelerate the module at 10 mps2?
In each experimental run, the concen tration of free available chlorine was varied and the time required to kill 99% of the organisms was determined. The results showed that a CT value of 200 min mg/L was sufficient to achieve a 2-log removal.
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