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dnl65078
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Homework Statement
Please help with this problem!
How many sprints from rest to a speed of 4.5 m/s would a 59 kg woman have to complete in order to burn off 5.0 x 102 Calories? (Assume 100% efficiency in converting food energy to mechanical energy.)
Homework Equations
The Attempt at a Solution
Speed (v) = 4.5 m /s
.
==> h = v2 / 2g = (4.5)2 / ( 2 * 9.8) = 1.033 m
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Mass (m) = 59 kg
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Energy (E) = 5.0 * 10-2 cal = 5.0 * 10-2 cal * (1000 * 4.186) J
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= 209.3 J
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number of sprints is :
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n = E / 2 m g h
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= (20.9.3 J) / ( 2 * 59 * 9.8 * 1.033 )
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= 0.1752 sprints