equal to the circumference of the pulley times thenumber of revolutions or 3.14 x 1 x 1,800 = 5,652 ft.You know that the motor is exerting a force of20 pounds through that distance. The work done in1 minute is equal to the force times the distance, orwork = F x D = 20 x 5,652 = 113,040 ft-lb/min.Change this to horsepower:113,04033,000= 3.43 hpTwo common motor or engine ratings withwhich you are familiar are the 1/16-hp motor of anelectric mixer and the 1/4-hp motor of a washingmachine.SUMMARYRemember two important points about power:Power is the rate at which work is done.Horsepower is the unit of measurement by whichpower is equivalent to 33,000 foot-pounds ofwork per minute, or 550 foot-pounds persecond.8-4
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