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# where did go wrong?

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## where did go wrong?

24. A motor is operating at 3450 RPM and is producing a torque of 32 lb-in. What is the output horsepower of the motor?
Help: HP = Torque x RPM ÷ 5252

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## Units

Originally Posted by tlktomegoose
24. A motor is operating at 3450 RPM and is producing a torque of 32 lb-in. What is the output horsepower of the motor?
Help: HP = Torque x RPM ÷ 5252
It says lb-in. Your formula is for lb-ft.

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Originally Posted by GrayTard
It says lb-in. Your formula is for lb-ft.
So to convert lbs per inch to lbs per foot is to multiply by 12 which is 384. Which throws my number way off.

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Originally Posted by tlktomegoose
So to convert lbs per inch to lbs per foot is to multiply by 12 which is 384. Which throws my number way off.
Your conversion is incorrect. Torque isn't measured in pounds per foot (lb/ft). It's measured in pound-foot (lb-ft), which is a concurrent unit, not reciprocal. So, to do the conversion correctly, you would need to divide your initial torque value by 12, not multiply.

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Your conversion is incorrect. Torque isn't measured in pounds per foot (lb/ft). It's measured in pound-foot (lb-ft), which is a concurrent unit, not reciprocal. So, to do the conversion correctly, you would need to divide your initial torque value by 12, not multiply.
Awesome! Thank you for the clarity.

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