When an automobile moves with constant velocity the power ...

[cookcarl]

When an automobile moves with constant velocity the power developed is used to overcome the frictional forces exerted by the air and the road. If the power developed in an engine is 50.0 hp, what total frictional force acts on the car at 55 mph (24.6 m/s)? One horsepower equals 746 W.

Question 2

While running, a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass. If a 60-kg person runs with a power of 70 Watts during a race, how fast is the person running? Assume a running step is 1.5 m long.

[epscape]

Answer to Question 1

1 520 N

Answer to Question 2

2.92 m/s

[cookcarl]

Thank you!

[epscape]

Always glad to help...