What's this problem talking about?

  • Thread starter AznBoi
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In summary, the conversation discusses the efficiency of bicycling and walking as means of transportation and the comparison of their energy consumption with travel by car. The problem involves converting units, specifically kcal/h into J/gal, and finding the fuel economy for walking and cycling. The necessary conversion factors and values are provided in the problem.
  • #1
AznBoi
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I've come across a problem and I have no idea on how to solve it.. I know it involves converting units but how do you convert kcal/h into J/gal? Please take your time to help me get started. Thanks!

Here is the problem:
For saving energy, bicycling and walking are far more efficient means of transportation than is travel by automobile. For example, when riding at 10 mi/h, a cyclist uses food energy at a rate of about 400kcal/h above what he would use if merely sitting still. (In exercise physiology, power is often measured in kcal/h rather than in watts. Here 1 kcal=1 nutritionist's Calorie = 4,186 J) Walking at 3mi/h requires about 220 kcal/h. It is interesting to compare these values with the nergy consumption required for travel by car. Gasoline yields about 1.30 x 10^8 J/gal. Find the fuel economy in equivalent miles per gallon for a pesron a) walking, and b) bycicling.
 
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  • #2
It's all right there in the problem. Just read it a bit more carefully, starting with the fuel economy for walking.
 
  • #3
Yeah I figured it out. I just kept converting and converting lol until I ended up with mi/gal. k thanks
 

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