Solved: Cycling. For a touring bicyclist the drag

Chapter 6, Problem 6.99

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Cycling. For a touring bicyclist the drag coefficient is 1.00, the frontal area A is and the coefficient of rolling friction is 0.0045. The rider has mass 50.0 kg, and her bike has mass 12.0 kg. (a) To maintain a speed of on a level road, what must the riders power output to the rear wheel be? (b) For racing, the same rider uses a different bike with coefficient of rolling friction 0.0030 and mass 9.00 kg. She also crouches down, reducing her drag coeffi- cient to 0.88 and reducing her frontal area to What must her power output to the rear wheel be then to maintain a speed of (c) For the situation in part (b), what power output is required to maintain a speed of Note the great drop in power requirement when the speed is only halved. (For more on aerodynamic speed limitations for a wide variety of human- powered vehicles, see The Aerodynamics of Human-Powered Land Vehicles, Scientific American, December 1983.)

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