Problem 11.44 The record time for a Tour de France cyclist to ascend the famed 1

Question

Problem 11.44 The record time for a Tour de France cyclist to ascend the famed 1100-m-high Alpe d'Huez was 37.5 min, set by Marco Pantani in 1997. Pantani and his bike had a mass of 65 kg. Assume the body works with 25 % efficiency. Part A How many Calories did he expend during this climb? Express your answer using two significant figures. A- 670 Cal Submit My Answers Give Up Correct Part B What was his average metabolic power during the climb? Express your answer to two significant figures and include the appropriate units W 17.86 W Submit My Answers Give Up Incorrect; Try Again Provide Feedback Continue

Explanation / Answer

part B)

1 cal = 4.184 J

then

670 cal = 670*4.184 J

t = 37.5 min = 37.5*60
average metabolic power is P = Energy spent / time taken = 670*4.184/(37.5*60) = 1.25 W

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