For a touring bicyclist the drag coefficient C (where fair)=1/2CAv^2) is 1.07, the frontal area A is 0.469 m^2, the air density is 1.20 kg/m^3,and the coefficient of rolling friction is 4.50×10^-3. The rider has mass 58.0 kg, and her bike has mass 12.2 kg. a) To maintain a speed of 11.8 m/s on a level road, what must the rider's power output to the rear wheel be?
P=W
b) For racing, the same rider uses a different bike with a coefficient of rolling friction 3.40×10^-3 and mass 8.80 kg. She also crouches down, reducing her drag coefficient to 0.880 and reducing her frontal area to 0.370 m^2. What must her power output to the rear wheel be then to maintain a speed of 11.8 m/s?
P=W
c) For the situation in part B, what power output is required to maintain a speed of 6.70 m/s?
P=W