Another Question - Thermal Energy & Sweat this time

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SUMMARY

The discussion centers on calculating the amount of liquid lost from the body when 630W of thermal energy is dissipated as heat. The problem states that the metabolic rate is 700W with an efficiency of 10%, resulting in 630W of heat loss through sweat evaporation. Participants emphasize the need to apply the concept of heat of vaporization to determine the liquid loss, highlighting the importance of understanding phase changes in thermal energy calculations.

PREREQUISITES
  • Understanding of thermal energy and heat transfer principles
  • Knowledge of the heat of vaporization concept
  • Familiarity with metabolic rates and energy efficiency calculations
  • Basic physics of phase changes in matter
NEXT STEPS
  • Research the specific heat of vaporization for water
  • Learn how to calculate liquid loss from sweat using thermal energy equations
  • Explore metabolic rate calculations and their implications on energy expenditure
  • Study the relationship between temperature, heat dissipation, and sweat evaporation
USEFUL FOR

Students in physics or biology courses, fitness professionals, and anyone interested in understanding the physiological effects of heat dissipation and sweat loss during physical activity.

miava
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Homework Statement




If 630W is dissipated as thermal energy/heat how much liquid is lost from the body?


The Attempt at a Solution



I have got through a 3 part problem (re: energy, work etc) and found how much energy is dissipated as heat (630W), but I have no info that leads me to the answer to the last part - how much liquid is lost as sweat. I don't have information on weight, temp or anything else as it wasn't provided in the question.
The metabolic rate to 700W and the efficiency is 10% so 630W is left as heat.
 
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You'll have to make some assumptions, such as, all the heat that the body dissipates, it does so through the evaporation of sweat.

To make liquid sweat on your skin evaporate into vapor, it must under a change in phase. Something about heats of vaporization. Does this start to sound familiar with what you're doing in class?
 

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