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 106-km race in which his average speed is 11.4 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

Avg power per Kg = 6.5 W
Average power = 6.5*75 = 487.5 W
a) Work = Power * time
time = distance/speed = 106000/11.4 = 9289.24 s
Work = 4.532 MJ
b) Work = 1.082 kCal

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