1. A 48,230 lb machine is being towed at uniform speed up a road with a 3.5% adverse grade. If the average tension in the cable is 3,522 lbs, what is the rolling resistance of the road?
2. A CAT 834H Wheel Loader (which has high pressure rubber tires) is pulled up a 3% adverse grade at a uniform speed. The towing tension is 6,060 lb. The weight of this machine is 103,849 lb. A) What is the rolling resistance of this road? B) What type of roadway surface is this?
3. A scraper whose operating weight is 186,000 lb is loaded down a 4% slope by being pushed by a 146,500 lb bulldozer. What is the equivalent gain in loading force from the scraper being loaded downslope instead of upslope?
4. Assume that a rubber-tired tractor has a total weight of 25,000 lb on its driving wheels and it has a maximum rimpull in low gear of 8,320 lb. If this machine is operating in wet clay/loam with a coefficient of friction of .45, what is the maximum possible rimpull prior to the slippage of tires?