Alexander wants to know exactly how many bars to pack in his backpack for the journey. To provide a margin of safety, he assumes that he will need as much energy for the return trip as for the uphill climb. How many bars should Alexander pack?
Alexander, who weighs 201 lbs., decides to climb Mt. Krumpett, which is 5220 m high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100- g bar contains 10 g of fat, 40 g of protein, and 50 g of carbohydrates.
I got a really high number around...2484042... and thats not even logical.
I first calculated the energy to climb the mountain which i found to be 4.67 *10^6 Joules.
I then began to calculate the energy in each nutrition bar...450 calories are in 1 nutrition bar. I then used a conversion factor to convert calories to Calorie... however its not converting right... I believe there are 1000calories in 1 Calorie... I then used another conversion factor 4.184 J in 1 Calorie.. im lost!
2007-11-21 21:24:25 · 2 answers · asked by hobiesailor07 1 in Science & Mathematics ➔ Chemistry
First calculate the Joules (work done by Alexander), divide by 4.184 to get calories and then divide by 1000 to get kilocalories or Calories.
201 lbs will be 90 kgs approx. And work done will be mgh = 90 x 10 x 5220 kg.m Double that for coming down.
2007-11-21 21:37:47 · answer #1 · answered by Swamy 7 · 0⤊ 2⤋
1 Joule =2.3901×10−4 kcal So 4.1 * 103 kcal * 1 J / 2.3901 x 10^-4 kcal = 1766872 or 1767 kJ
2016-05-25 00:09:28 · answer #2 · answered by ? 3 · 0⤊ 0⤋