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posted by  ZLC3936 on 10/4/2007 8:41:24 PM  |  status: Live  

Tour de France

Course Textbook Chapter Problem
Calculus Based Physics Physics (7th) by Cutnell, Johnson 6 56P
Question Details:

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 152-km race in which his average speed is 11.8 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.

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posted by Gorilla :) on 10/5/2007 1:47:26 AM  |  status: Live
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ZLC3936's comment:
"GREAT!!!"
Response Details:
given mass of bycyclist 75.kg
average power for kg weight 6.50 W
total power generated 487.5
distance traveled by bicyclist 152000meters
average velocity 11.8m/s
t= 152000/11.8m/s
t=12881.35593
tw= 12881.35593* 487.5
answer to part A is tw=6279661.017 calories
work done * Ijoule
6279661.017*2.389 x 10-4
answer to part B is 1500.211017  calories
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