Please Help...(adsbygoogle = window.adsbygoogle || []).push({});

Given: A person walks about 3.6 calories/minute.

How much energy is in a 40 Watt light bulb, that is lit for 5.6 hours?

Answer: I think it is 144000 J/hr. I am not sure what to do with the 5.6

hours. I think it should be used to caluculate the total J which

would be 806400.

Question: I need to find the amount of time it takes to walk that equals the energy of the light bulb (in hours) using the calorie amount given.

I have taken the total J (806400) and divided by the calorie/hr (I converted the 3.6 calorie/min to calorie/hour). Then I tried to solve for the total number of hours. I keep getting the wrong answer.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Use Joules to find Energy

**Physics Forums | Science Articles, Homework Help, Discussion**