Bicyclists in the Tour de France do enormous amounts of work during a race. For
ID: 1347032 • Letter: B
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 190-km race in which his average speed is 11.5 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.
need help with part A! Thanks!
Explanation / Answer
Work=P×m×t
= P×m×s/v
=6.5×75×190000/11.5
=8.05×10J
=1.9×10^3nutr.cal.
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