University Physics with Modern Physics with Mastering Physics (11th Edition)

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6.90: a) The hummingbird produces energy at a rate of J/s 7 . 0 to J/s. 75 . 1 At 10 beats/s, the bird must expend between 0.07 J/beat and 0.175 J/beat. b) The steady output of the athlete is W/kg, 7 kg W/70 500 = which is below the 10 W/kg necessary to stay aloft. Though the athlete can expend
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Unformatted text preview: W/kg 2 kg W/70 400 1 = for short periods of time, no human-powered aircraft could stay aloft for very long. Movies of early attempts at human-powered flight bear out this observation....
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This document was uploaded on 02/04/2008.

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