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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 0.46 m^{2} and, because the human body is not aerodynamically shaped, a drag coefficient of 0.90.

What is the cyclists power output while riding at a steady 7.3 m/s (16 mph)?

*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 cyclists metabolic power while cycling at 7.3 m/s?

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 1.6 h ?

Power