A fully loaded wheeled scraper (Model #: 615C) must travel d…

A fully loaded wheeled scraper (Model #: 615C) must travel down a 3% slope on an unmaintained hard road (tire penetration is 5 inches and the coefficient of traction is estimated to be 0.45), and then return to the same location. Only the front tires of this scraper are powered, and you can obtain the following information from the manufacturer’s data. Empty vehicle weight: 97,000 lb; Fully loaded vehicle weight: 172,000 lb; When empty, 37% of the weight on the rear tires, 63% on the front tires; When fully loaded, 50% of the weight on the rear tires, 50% on the front tires;What is the total effective grade when hauling down the slope?

A contractor plans to excavate 3,900 bank cubic yards from a…

A contractor plans to excavate 3,900 bank cubic yards from a site. He needs to have 1,250 compacted cubic yards for the backfill of excavations. The soil test shows that the soil has a bank density of 1,800 pounds per cubic yard, a loose density of 1,500 pounds per cubic yard, and a compacted density of 2,400 pounds per cubic yard. He plans to use a truck that can haul 20 loose cubic yard per load. How many full truckloads of loose excess material should be hauled off the site?

A contractor wants to investigate the production and cost di…

A contractor wants to investigate the production and cost differences of using a 4S blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a distance of 150 ft from the beginning of the cut. The dozing is uphill on a 10% grade. The operator will have average skill. The site conditions will be dark for visibility. The material weighs 90 pcf in the bank state. Job efficiency is assumed to be equivalent to a 45-min hour. Find the ideal production rate for D4H-4S. Please choose a range from the following choices where your reading will be within.

A contractor wants to investigate the production and cost di…

A contractor wants to investigate the production and cost differences of using a 4S blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a distance of 150 ft from the beginning of the cut. The dozing is uphill on a 10% grade. The operator will have average skill. The site conditions will be dark for visibility. The material weighs 90 pcf in the bank state. Job efficiency is assumed to be equivalent to a 45-min hour. What is the material-weight correction factor? Assume the percent swell is 12%.