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What is the maximum length of trench that can excavated by hand economically rather than by a trenching machine. it 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.
Use hand excavation data from table 7-3 to obtain the production rates to loosen earth with a pick, shovel earth from the trench, and shovel earth back from the edge of the trench. 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 appliestrenching machine $42.82/hrtrencher operator $20.45/hrlaborers each $16.65/hrforeman $28.30/hr
loosen earth with pick= 1/4 - 1 cy/hrshoveling earth from trenches = 1/2 - 1cy/hrshoveling earth into truck= 1/2 - 1 cy/hr
a rectangular prism box which is floating on water has a length L =1200mm, breadth = 800mm, height = 500mm and mass of 52kg. when the box is loaded with the suspended hexagonal mass, its immersion is 300mm, and when it the mass is placed inside th..
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