1. A 20 horsepower engine is used to lift gravel from the ground to the top of a building 60 ft high. Neglecting loss of energy due to friction, how many tons of gravel can be lifted in 50 minutes? 1 hp = 33.000 ft-lb per minute 1 ton = 2000 lb 2.The engines of an airplane exerts a force of 4,000 lb when traveling with a constant velocity of 300 mi/hr. How much horsepower is delivered?

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