Question
Mountain climbers carry bottled oxygen when at very high altitudes. (a) Assuming that a mountain climber uses oxygen at twice the rate for climbing 116 stairs per minute (because of low air temperature and winds), calculate how many liters of oxygen a climber would need for 10.0 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 if he and his equipment have a mass of 90.0 kg and he gains 1000 m of altitude? (c) What is his efficiency for the 10.0-h climb?

a) $5.88 \times 10^3 \textrm{ L}$

b) $8.82 \times 10^5 \textrm{ J}$

c) $1.79\%$

Note that in the video for part (a) Shaun mentions that we're going to find the volume of oxygen utilized, but he should have said oxygen consumed.

Solution Video