Figure 6.40 shows the oxygen consumption rate of men walking and running at diff

Question

Figure 6.40 shows the oxygen consumption rate of men walking and running at different speeds. The vertical axis shows the volume of oxygen (in cm3) that a man consumes per kilogram of body mass per minute. Note the transition from walking to running that occurs naturally at about 9 km/h. The metabolism of 1 cm3 of oxygen releases about 20 J of energy. Using the data in the graph, calculate the energy required for a 70-kg man to travel 1 km on foot at (a) 5 km/h (walking); (b) 10 km/h (running); (c) 15 km/b (running). (d) Which speed is the most efficient-that is, requires the least energy to travel 1 km?

Explanation / Answer

a)A 70-kg man needs about 2.0

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