A contractor proposes to use scrapers on an embankment job. The performance characteristics of the machines isshownbelow. Operating weight empty is 69,000 lb. The weight distribution ofthe scraper when loaded is 53% on the drive wheels.Based on past jobs the average scraper load should be 15.625bcy. The haul from the excavation area isa uniform adverse gradient of 4%with a rolling resistance of 120lb/ton. The material to be excavated and transported is a common earth with a bank unit weight of 3,200 lb/bcy. a.What is the total operating weight of the fully loaded scraper? b.What is the total resistance of the scraper (haul and return) in pounds and effective grade? c.Whatthe expected maximum travel speedsfor haul and return? d.If the maximum available rimpull (power) is 14,025 lband coeffiecent of traction is 0.5,what is theusablepower?