Example: biology
UNDERSTANDING TRACTOR-TRAILER PERFORMANCE
GRADE (HILL) On a grade, the Wheel Demand horsepower increases significantly as vehicle weight increases. Figure 4 shows Wheel Demand Horsepower vs. MPH, on a 3% grade and on a calm day (no wind) for the automobile and the three (3) tractor-trailer combinations described in Figure 1. Figure 4.
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