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- Mar 15, 2011
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"The Cooper test determines the maximum aerobic capacity of an individual by having the subj. run for 12 minutes on a treadmill. If a man ran 2 km in this time, how much work did he do? (g = 10 m/s^2)"
a) 0 J
b) 20,000 J
c) -20,000 J
d) 20 J
_________
Me? I didn't even calculate anything. I knew someone who has run 2 km is going to use up a lot more than 0 or 20 J, so I picked choice b.
Examkrackers is trying to say that since W = F * d, there is 0 displacement and the work is 0.
The problem with this is that it's so freaking wrong. Just straight up wrong. The displacement is measured relative to the treadmill and to the work your muscles do on your bones; it has nothing to do with the displacement of your physical body relative to the stationary world. https://www.reddit.com/r/askscience/comments/3peet3/work_force_x_distance_i_just_ran_5k_on_a/
Would this kind of a question show up on an AAMC exam? I don't know whether or not to go with the stupid answer (i.e. not actually thinking about the work done and just trying to turn it into a 'displacement is 0.. hehehe' problem) or actually calculate something.
a) 0 J
b) 20,000 J
c) -20,000 J
d) 20 J
_________
Me? I didn't even calculate anything. I knew someone who has run 2 km is going to use up a lot more than 0 or 20 J, so I picked choice b.
Examkrackers is trying to say that since W = F * d, there is 0 displacement and the work is 0.
The problem with this is that it's so freaking wrong. Just straight up wrong. The displacement is measured relative to the treadmill and to the work your muscles do on your bones; it has nothing to do with the displacement of your physical body relative to the stationary world. https://www.reddit.com/r/askscience/comments/3peet3/work_force_x_distance_i_just_ran_5k_on_a/
Would this kind of a question show up on an AAMC exam? I don't know whether or not to go with the stupid answer (i.e. not actually thinking about the work done and just trying to turn it into a 'displacement is 0.. hehehe' problem) or actually calculate something.