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Solving for work Power equations

  1. Oct 4, 2007 #1
    Bicyclists in the Tour de France do enormous amounts of work during a race. For example, the average power per kilogram generated by Lance Armstrong (m = 75.0 kg) is 6.50 W per kilogram of his body mass. (a) How much work does he do during a 155-km race in which his average speed is 12.3 m/s? (b) Often, the work done is expressed in nutritional Calories rather than in joules. Express the work done in part (a) in terms of nutritional Calories, noting that 1 joule = 2.389 x 10-4 nutritional Calories.

    (avg)P=w/t

    ke=1/2mv^2

    w=KEf - KEi

    (avg)P= F * S(avg)
     
  2. jcsd
  3. Oct 5, 2007 #2
    the answer for those numbers is:

    A: 6143292.682926829 J
    B: 1466.846 Calories
     
  4. Oct 5, 2007 #3

    learningphysics

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    Homework Helper

    Looks good. watch the rounding though... i'm getting 1467.6 calories....
     
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