Bicyclists in the Tour de France do enormous amounts of work during a race. For

Question

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 135-km race in which his average speed is 11.2 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.

Explanation / Answer

I believe you just need to work out how much time the race took and with that, you can work out how much work he did at it.


135000 / 11,2 = 12053.57s
6.5 x 75 = 487.5W, since watts are joules per second:
12053.57 x 487.5 = 5,876116.071J

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