problem06_90

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

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

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....
View Full Document

This document was uploaded on 02/04/2008.

Ask a homework question - tutors are online