Question
Asked Oct 29, 2019
While running, a person dissipates about 0.596 J of mechanical energy per step per kilogram of body mass. If a 64.8 kg runner dissipates a power of 71.0 W during a race, how fast is the person running? Assume a
running step is 1.50m in length.
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While running, a person dissipates about 0.596 J of mechanical energy per step per kilogram of body mass. If a 64.8 kg runner dissipates a power of 71.0 W during a race, how fast is the person running? Assume a running step is 1.50m in length.

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check_circleExpert Solution
Step 1

Power dissipation during the race is 71.0 W. it means that the energy dissipated per second is 71.0 J. So, the energy dissipated per second per kilogram is,

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Step 2

Number of steps made by person in a second is,

Ev
n=
Extop
1.1J/kg s
0.596 J
1.8
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Ev n= Extop 1.1J/kg s 0.596 J 1.8

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Step 3

Distance travelled in on...

dnd
(1.8)(1.50m)
-2.7m
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dnd (1.8)(1.50m) -2.7m

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Work,Power and Energy

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