Running on a treadmill is slightly easier than running outside because there is

Question

Running on a treadmill is slightly easier than running outside because there is no drag force to work against. Suppose a 60 kg runner completes a 5.0 km race in 23 minutes. Determine the drag force on the runner during the race. Suppose that the cross section area of the runner is 0.72 m^2 and the density of air is 1.2 kg/m^3. Express your answer to two significant figures and include the appropriate units. What is this force as a fraction of the runner's weight? Express your answer using two significant figures.

Explanation / Answer

Part A)

we know that

drag force

Fd = density x A xV^2

from given info V = 5000/23x60

Fd = 11.34 N

Part B

D/w = 0.0192

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