A two-engine jet transport has a loaded weight of 97000 lb and a forward thrust of 9340 lb per engine during takeoff. If the transport requires 6400 ft of level runway starting from rest to become airborne at a speed of 150 knots (1 knot = 1.151 mi/hr), determine the average resistance R to motion over the runway length due to drag (air resistance) and mechanical retardation by the landing gear.

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Q: R = _______lb

A: NEED TO FIND AVERAGE RESISTANCE

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.