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Homework Help: How to solve how much work is done:

  1. Oct 3, 2011 #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 80-km race in which his average speed is 12.0 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 10-4 nutritional Calories.

    Ke=1/2 mv^2

    I started with plugging the information I was given into the problems above, but got stuck after that.
  2. jcsd
  3. Oct 3, 2011 #2


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    For part (a) how long did the race last (for him, anyway)?
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