Question

Each of the 4 engines on a Boeing 747 delivers about 30,000 horsepower at its cruising speed. If such a plane is cruising at 950 km/hr, powered by all 4 engines, what is the average force of thrust provided by the engines?

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Solution:

If a constant, nondissipative external force is applied to a solid block, and it is found that the rate at which energy is delivered by the force is constant as the block moves horizontally, the speed of the block will also be constant.

\therefore The motion of the block depicts a constant speed.

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