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How to calc human bicycle power in watts

  1. May 9, 2007 #1
    1. The problem statement, all variables and given/known data
    How to calculate Lance Armstrongs power output/calorie consumption at 30 mph, 125 miles on level ground , no wind, 157 lbs plus 16lb bike?

    2. Relevant equationsWhat equations do I use?

    3. The attempt at a solution
    I'm 14 years old, where do I start
  2. jcsd
  3. May 9, 2007 #2


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    Gold Member

    I don't think there's enough information given to do the calculation. The energy used will be a function of the resistive forces that have to be overcome by the cyclist. In an ideal world, travelling at constant speed on a flat track uses no energy, but in reality there's friction and wind resistance and other things also.

    Doesn't Lance Armstrong weigh more that 157 lbs ?
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