Question
In: Physics
Running on a treadmill is slightly easier than running outside because there is no drag force...
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 22 minutes.
a) Determine the drag force on the runner during the race. Suppose that the cross section area of the runner is 0.72 m2m2.
b) What is this force as a fraction of the runner's weight?
Solutions
Expert Solution
the
answers are,
A. 6.17 N
B. 0.01049
Solution of an Drag force usually aets opposite to the motion Obiect resisti iting its motion Given in the question, mass of the runner, me 60 kg. Distance travelled, d = 5.0 km - 5000m Time taken, t = 22 minute = 22X 60 5 = 1320 S. Thus, Velocity of the traveller, va voce 5000 mis 1320 - 3.78 m/s The expression for drag force, D- LXCXP x v?x A Here, p is the density of the medium je air Sº, pa 1.2 kg/m?
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