Homework Help: physics - runner

Posted by lau on Friday, June 4, 2010 at 12:12pm.

While running, a person dissipates about 0.60 J of mechanical energy per step per kilogram of body mass. If a 60 kg person develops a power of 78 W during a race, how fast is the person running? (Assume a running step is 1.5 m long.)

physics - runner - Damon, Friday, June 4, 2010 at 8:37pm
.6 j/(step kg) *60 kg = 36 j/step

36 j/step *1 step/1.5 m = 24 J/m

24 J/m * v m/s = 24 v J/s or 24 v watts

24 v watts = 78 watts
v = 78/24 = 3.25 meters/second
physics - runner - bobpursley, Saturday, November 12, 2011 at 3:13pm
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physics - runner - bobpursley, Saturday, November 12, 2011 at 3:33pm
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physics - runner - bobpursley, Saturday, November 12, 2011 at 3:34pm
4PPL35 4R3 F0R N0085

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