Consider a wheel-type tractor-pulled scraper whose gross weight is 118,700 lb. What is the equivalent gain, in horsepower (hp), resulting from operating this vehicle down a 4% slope instead of up the same slope at a speed of 12 mph? One horsepower equals 33,000 ft-lb of work per minute.

Sustainable Energy
2nd Edition
ISBN:9781337551663
Author:DUNLAP, Richard A.
Publisher:DUNLAP, Richard A.
Chapter18: Energy Storage
Section: Chapter Questions
Problem 4P
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Consider a wheel-type tractor-pulled scraper whose gross weight is 118,700 lb. What is the equivalent gain, in horsepower (hp), resulting from operating this vehicle down a 4% slope instead of up the same slope at a speed of 12 mph? One horsepower equals 33,000 ft-lb of work per minute.
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