A wheel tractor-scraper whose weight on the driving wheels is 38,720 lb (17,563 kg) has a gross

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A wheel tractor-scraper whose weight on the driving wheels is 38,720 lb (17,563 kg) has a gross weight of 70,400 lb (31,933 kg). If the road surface is dry earth having a rolling resistance factor of 100 lb/ton (50 kg/t), what is the maximum grade the scraper could ascend?

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