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Thread: Human horsepower

  1. #1 Human horsepower 
    Forum Freshman Gen1GT's Avatar
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    Let's say I'm doing exercises on a stepper that is 6 inches off the ground. Let's say I weigh 300 pounds, and I do 60 step ups in 1 minute. According to my calculations, the work done would be 9000 ft/lbs, and the power would be 9000ft/lbs per minute, or just over 1/4 horsepower.

    However, work is being done "on the negative." How would I calculate how much power is required to lower my 300 pound body those 6 inches, 60 times in a minute? i.e., how much of my potential energy at 6 inches has to be absorbed by my muscles to prevent me from dropping like a rock? Can "the negative" even been considered here when calculating power?


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  3. #2  
    Forum Freshman Gen1GT's Avatar
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    I guess nobody likes to mix physics with biology with mechanical engineering...


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  4. #3  
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    Maybe nobody here knows the answer. Going downhill, or down the stairs, does require some energy, but it's a lot less than going up. It's not going to be a simple physics calc.
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  5. #4  
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    I would assume some calculations are involved with fighting the acceleration of gravity...
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