Chapter 5 Homework Problem 5.38-Enhanced- with Feedback Determine the drag force

Question

Chapter 5 Homework Problem 5.38-Enhanced- with Feedback Determine the drag force on the runner during the race. Suppose that the cross section area of the runner is 0.72 m Express your answer with the appropriate units Running on a treadmill is slightly easier than running outside because there is no drag force to work against Suppose a 6o kg runner completes a 5.0 km racein 20 minutes DValue Units Submit Reavet Answer PartB What is this force as a fraction of the runner's weigh Expeess your answer numerically

Explanation / Answer

(a)

formula for drage force

D = 1/2 * rho*Cd* A v^2

= 1/2 * (0.5) (1.2)(0.72) ((5 km/20 min ( 1000 m/ km) (min/ 60 s))^2

=3.75 N

(b)

D/w = 3.75 N/60(9.8) = 0.006377

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