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March 4, 2015

March 4, 2015

Posted by **George** on Monday, September 29, 2008 at 3:14pm.

How would I even go about solving this problem? The total calories is 450 for a total bar that I calculated, is this right?

- Chemisrty -
**bobpursley**, Monday, September 29, 2008 at 3:41pmyes, 450 Food calories is correct.

I am reluctant to work this out, as the problem is ridiculous. It wants you to assume 100 percent efficiency in conversion of candy to gravational potential energy ...which is a most riciculous assumption...then assume there is no gain of energy (loss of PE) going back down the mountain. All this makes the problem border on science fiction. Also, I wonder if whomever created this problem is competent in science.

All that notwithstanding...

numbercandybars*450FoodCalories*2000calories/FoodCalorie*4.18joules/cal

is the energy from the candy bar.

The change in gravitaional potential energy going up the mountain is mass*g*change in height.

set those equal, and you can solve for the number of candy bars given the silly assumptions above.

- Chemisrty -
**George**, Monday, September 29, 2008 at 5:27pmI am getting 22.6, but it says that is the wrong answer.

450*2000*4.18=3762000

159*5460*9.8=8507772

I am setting them equal to eachother and getting 2.26, but it says the answer is wrong. Please help.

- Chemisrty -

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