III When you ride a bicycle at constant speed, nearly all the energy you expend goes into the work you do against the drag force of the air. Model a cyclist as having cross-section area 0.45 m² and, be- cause the human body is not aerodynamically shaped, a drag coef- ficient of 0.90. a. What is the cyclist's power output while riding at a steady 7.3 m/s (16 mph)? b. Metabolic power is the rate at which your body "burns" fuel to power your activities. For many activities, your body is roughly 25% efficient at converting the chemical energy of food into mechanical energy. What is the cyclist's metabolic power while cycling at 7.3 m/s? c. The food calorie is equivalent to 4190 J. How many calories does the cyclist burn if he rides over level ground at 7.3 m/s for 1 h?

III When you ride a bicycle at constant speed, nearly all the energy you expend goes into the work you do against the drag force of the air. Model a cyclist as having cross-section area 0.45 m² and, be- cause the human body is not aerodynamically shaped, a drag coef- ficient of 0.90. a. What is the cyclist's power output while riding at a steady 7.3 m/s (16 mph)? b. Metabolic power is the rate at which your body "burns" fuel to power your activities. For many activities, your body is roughly 25% efficient at converting the chemical energy of food into mechanical energy. What is the cyclist's metabolic power while cycling at 7.3 m/s? c. The food calorie is equivalent to 4190 J. How many calories does the cyclist burn if he rides over level ground at 7.3 m/s for 1 h?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.

Question

When you ride a bicycle at constant speed, nearly all the energy
you expend goes into the work you do against the drag force of the
air. Model a cyclist as having cross-section area 0.45 m² and, be-
cause the human body is not aerodynamically shaped, a drag coef-
ficient of 0.90.
a. What is the cyclist's power output while riding at a steady
7.3 m/s (16 mph)?
b. Metabolic power is the rate at which your body "burns" fuel
to power your activities. For many activities, your body is
roughly 25% efficient at converting the chemical energy of
food into mechanical energy. What is the cyclist's metabolic
power while cycling at 7.3 m/s?
c. The food calorie is equivalent to 4190 J. How many calories
does the cyclist burn if he rides over level ground at 7.3 m/s
for 1 h?

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