Researchers have measured the acceleration of racing greyhounds as a function of their speed; a simplified version of their results is shown in Figure P4.67. The acceleration at low speeds is constant and is limited by the fact that any greater acceleration would result in the dog pitching forward because of the force acting on its hind legs during its power stroke. At higher speeds, the dog’s acceleration is limited by the maximum power its muscles can provide.

a. What is the agent of the force that causes the dog to accelerate?

b. If the dog’s mass is 32 kg, what is the average force acting on it during its initial acceleration phase?

c. How far does the dog run in the first 4.0 s?

Transcribed Image Text:

a (m/s) 10+ 8- 6- 4 2 0- 0 2 4 FIGURE P4.67 9 v (m/s) 8 10 12 14