Physics treadmill question. PLEASE HELP! Been trying for hours explain all parts please I will give best answer.?

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 18 minutes.

Part A
Determine the drag force on the runner during the race. Suppose that the cross section area of the runner is 0.72 m2 and the density of air is 1.2 kg/m3.
Part B
What is this force as a fraction of the runner's weight?

oubaas2016-09-21T04:38:32Z

average speed = 5000/(18*60) = 4.630 m/sec
drag force = V^2/1.6*A = 4.63^2/1.6*0.72 = 9.65 N
(drag force/runner weight) in % = 100*9.65/(60*9.8) = 1.64 %

36

ambuj2016-09-21T03:30:35Z

Fd = ρν²ACd/2.

02

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