Mountain climbers carry bottled oxygen when at very high altitudes, since the atmosphere contains less and less as you go higher up. a. Assuming that a mountain climber uses 3.92 liters of oxygen per minute, calculate how many liters of oxygen a climber would need for 11 h of climbing. (These are liters at sea level.) Note that only 40% of the inhaled oxygen is utilized; the rest is exhaled. b. How much useful work does the climber do, in joules, if he and his equipment have a mass of 97.5 kg and he gains 1150 m of altitude? c. What is his efficiency for the 11-h climb? Assume his total energy consumption is 1370 W.

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.