If 10% of a 50-kg rock climber’s total energy expenditure...

Name: Problem 86, Chapter 6: College Physics
Uploaded: 2020-04-10T14:30:06-08:00
Duration: 1 min 26 s
Channel: Zulfiqar Ali
Description: If 10% of a 50-kg rock climber’s total energy expenditure goes into the gravitational energy change when climbing a 100-m vertical slope, what is the climber’s average metabolic rate during the climb if it takes her 10 min to complete the climb? (a) 8 W (b) 80 W (c) 500 W (d) 700 W (e) 800 W

If 10% of a 50-kg rock climber’s total energy expenditure goes into the gravitational energy change when climbing a 100-m vertical slope, what is the climber’s average metabolic rate during the climb if it takes her 10 min to complete the climb? (a) 8 W (b) 80 W (c) 500 W (d) 700 W (e) 800 W

Key Concepts

Energy Efficiency

Energy efficiency in the context of human movement refers to the proportion of metabolic energy that is effectively converted into useful work, such as climbing against gravity. When only a certain percentage of the energy expenditure contributes to doing mechanical work, understanding this efficiency becomes essential in calculating overall energy consumption and metabolic power.

Power

Power is defined as the amount of work done or energy transferred per unit time. In physics, power is calculated as the energy divided by the time interval over which the energy is consumed or work is performed. This concept is crucial in situations where energy is expended during specific time frames, such as during an exercise or task.

Gravitational Potential Energy

Gravitational potential energy is the energy an object possesses due to its position relative to a gravitational field. It is calculated using the formula m · g · h, where m represents mass, g is the acceleration due to gravity, and h is the height change. This concept is key when analyzing energy changes in activities like climbing, where elevation gain translates into increased gravitational potential energy.

Metabolic Rate

Metabolic rate is the rate at which the body consumes energy to sustain its physiological functions and perform physical activities. It is typically measured in watts, which correspond to joules per second. In exercise physiology, estimating the metabolic rate during physical activity involves understanding how energy is expended over time.

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