3. An earth moving contractor encounters a trap-rock formation at shallow depth in a cut. Seismographic tests indicate a

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3 An Earth Moving Contractor Encounters A Trap Rock Formation At Shallow Depth In A Cut Seismographic Tests Indicate A 1 (39.35 KiB) Viewed 48 times

3. An earth moving contractor encounters a trap-rock formation at shallow depth in a cut. Seismographic tests indicate a seismic velocity of 7,500 fps for the material. On this bassis, it is proposed to rip the rock with a 380-hpcrawler tractor. Estimate the production in bcy, for full time ripping with efficiency of 50-min hour. Assume the ripper is equipped with a single shank and the ripping condition is average (intermediate between extreme conditions). The normal O&O cost per hour, including the operator, for a 380 hp tractor with ripper is $102.50. This is classified as having ripping. Using your estimate of hourly production, estimate the ripping unit-production cost in dollars per bcy without operator. (25 points) SEISM. VELOUTÉ = 7500 fps TO RIP ROCK w 380-hp CRAWLER TRACTOR EFFICIENCY 50 MIN LO MW