4. A crawler hoe having a 2 ½ -cy bucket and whose cost per hour, including the wages to an operator, is $67, will excavate and load haul units under each of the stated conditions. The maximum digging depth of the machine is 20 ft. Determine the cost per bank cubic yard for each condition. (Condition 1. 300 bcy/hr, $0.223/bcy; Condition 2.319 bcy/hr, $0.210/bcy; Condition 3. 128 bcy/hr, $0.523/bcy) Condition (1) (2) (3) Material Moist loam, earth Sand and gravel Rock, well blasted Depth of excavation (ft) 12 16 14 Angle of swing (degrees) 60 80 120 Percent swell 14 Efficiency factor (min-hr) 45 50 45
4. A crawler hoe having a 2 ½ -cy bucket and whose cost per hour, including the wages to an operator, is $67, will excavate and load haul units under each of the stated conditions. The maximum digging depth of the machine is 20 ft. Determine the cost per bank cubic yard for each condition. (Condition 1. 300 bcy/hr, $0.223/bcy; Condition 2.319 bcy/hr, $0.210/bcy; Condition 3. 128 bcy/hr, $0.523/bcy) Condition (1) (2) (3) Material Moist loam, earth Sand and gravel Rock, well blasted Depth of excavation (ft) 12 16 14 Angle of swing (degrees) 60 80 120 Percent swell 14 Efficiency factor (min-hr) 45 50 45
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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