Figure 6.40 shows the oxygen consumption rate of men walking and running at different speeds. The vertical

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?

Figure 6.40 shows the oxygen consumption