Recent content by Maxpin

For a running man it would be interesting to know what's the energy lost (friction, hot, etc). Then you say that this lost energy MUST be all the burnt energy independently of the speed. The question is why in the real life at a bigger burnt energy there is a bigger speed?

You are right and I know this problem cannot be answered in a simple form. The runner doesn't keep increasing his kinetic energy because we assume the given data are correct in the text question. That means he needs 812.77 J each second to keep a constant speed. Of course, we know there could be...

I have given the exact wording of the problem. I know that once he has achieved that speed, he would not need to keep outputting energy at that rate. But if we look at the problem data we must believe that he burns 812.77 J per second as indicated for a 100% efficacy. If these considerations...

Ok thanks. I know there is not an easy relationship between speed and consumption energy in a biomechamical system. It would be necessary to know some forces acting no the system. However considering an average calculation and if we suppose all the burned energy is only employed to develop...

Homework Statement A 80 kg man is running and each second he needs a energy of 812.77 J. Find: a) The speed (in m/S) of the runner. b) How many kcal will be burn in one hour with the speed calculated in a)? Homework Equations Kinetic energy; kcal = 4184 J The Attempt at a...