How to calc human bicycle power in watts

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SUMMARY

This discussion focuses on calculating the power output in watts for a cyclist, specifically Lance Armstrong, while riding at 30 mph over a distance of 125 miles on level ground. The cyclist's weight is stated as 157 lbs, with an additional 16 lbs for the bike. Key factors influencing energy consumption include resistive forces such as friction and wind resistance, which must be accounted for in the calculations. The participant expresses uncertainty about the adequacy of the provided information for a complete calculation.

PREREQUISITES
  • Understanding of basic physics principles related to motion and forces
  • Familiarity with the concept of power in watts
  • Knowledge of resistive forces affecting cycling, including friction and wind resistance
  • Ability to apply equations of motion to real-world scenarios
NEXT STEPS
  • Research the equations for calculating power output in cycling, including drag force and rolling resistance
  • Learn about the effects of weight on cycling performance and energy expenditure
  • Explore methods for estimating wind resistance at various speeds
  • Investigate tools or software for simulating cycling performance under different conditions
USEFUL FOR

This discussion is beneficial for cyclists, sports scientists, and anyone interested in understanding the physics of cycling performance and energy consumption.

Dyllon
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Homework Statement


How to calculate Lance Armstrongs power output/calorie consumption at 30 mph, 125 miles on level ground , no wind, 157 lbs plus 16lb bike?


Homework Equations

What equations do I use?



The Attempt at a Solution


I'm 14 years old, where do I start
 
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I don't think there's enough information given to do the calculation. The energy used will be a function of the resistive forces that have to be overcome by the cyclist. In an ideal world, traveling at constant speed on a flat track uses no energy, but in reality there's friction and wind resistance and other things also.

Doesn't Lance Armstrong weigh more that 157 lbs ?
 

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