Estimate the power needed to overcome the aerodynamic drag of a person who runs at a rate of 100 yds (300 ft) in 10 seconds into a 29.3 ft/s head-wind. Express your answer in terms of horsepower. Assume CDA = 9 ft2 for the runner. NOTE: ρAIR = 2.38x10-3 slugs/ft3, 1 horse power = 550 lb∙ft/sec.

Estimate the power needed to overcome the aerodynamic drag of a person who runs at a rate of 100 yds (300 ft) in 10 seconds into a 29.3 ft/s head-wind. Express your answer in terms of horsepower. Assume CDA = 9 ft2 for the runner. NOTE: ρAIR = 2.38x10-3 slugs/ft3, 1 horse power = 550 lb∙ft/sec.

Sustainable Energy

2nd Edition

ISBN:9781337551663

Author:DUNLAP, Richard A.

Publisher:DUNLAP, Richard A.

Chapter13: Tidal Energy

Section: Chapter Questions

Problem 17P

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Question

Estimate the power needed to overcome the aerodynamic drag of a person who runs at a rate of 100 yds (300 ft) in 10 seconds into a 29.3 ft/s head-wind. Express your answer in terms of horsepower. Assume C_DA = 9 ft2 for the runner. NOTE: ρ_AIR = 2.38x10^-3 slugs/ft3, 1 horse power = 550 lb∙ft/sec.

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