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Solution: What size of motor is required to lift 800 lbs in 40 seconds through 40 feet?

What size of motor is required to lift 800 lbs in 40 seconds through 40 feet?

Problem Statement: ME Board October 1992

The time required for an elevator to lift a weight varies directly with the weight and the distance through which it is to be lifted and inversely as the power of the motor. If it takes 30 seconds for a 10 hp motor to lift 100 lbs through 50 feet, what size of motor is required to lift 800 lbs in 40 seconds through 40 feet?

Problem Answer:

The size of the motor is 48 horsepower.

Solution:

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