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 seven-time-winner Lance Armstrong (m =75.0 kg) is 6.50 W per kilogram of his body mass. How much work does he do during a 110 km race in which his average speed is 10.5 m/s? 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 times 10^- 4 nutritional Calories nutritional Calories

Explanation / Answer

b)

E = work done = 5107143 J

given 1 J = 2.389 x 10-4 nutritional calories

hence E = (5107143) (2.389 x 10-4) nutritional calories

E = 1220.1 nutritional calories

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