Climbing in Place

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98.Climbing in Place

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A treadwall is a vertical climbing surface that descends continuously past a stationary platform, letting a climber ascend without ever rising. The wall moves downward at

0.50\,\text{m/s}

. A climber of mass

80\,\text{kg}

grips the holds and climbs upward relative to the wall at the same speed, so they remain at rest in the gym frame. Take

g = 10\,\text{m/s}^2

. If the climber does this for

30\,\text{s}

, the total work the climber performs on the wall, in the gym frame, is

-1.2\times 10^4\,\text{J}

-6\times 10^3\,\text{J}

0\,\text{J}

+6\times 10^3\,\text{J}

+1.2\times 10^4\,\text{J}

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