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How long can one Snickers bar if the brain consumes 22 W power under normal condition

  • #1
1. The human brain consumes about 22 W of power under normal conditions, though more power may be required during exams. How long can one Snickers bar (280 cal per bar) power the normally functioning brain? [Note: The nutritional calorie, 1 cal, is equivalent to 1000 calories (1000 cal) as defined in physics. In addition, the conversion factor between calories and joules is as follows: 1 cal = 1000 calories = 1 kcal = 4186 J]


2. I know I need to use P=W/t



3. I converted cal. in the snickers bar to kcal and then did .280 kcal/4186 to get joules in one snickers. plugged that in for W but i'm not getting the right answer
 

Answers and Replies

  • #2
tiny-tim
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welcome to pf!

hi tennischick89! welcome to pf! :wink:
1 cal = 1000 calories = 1 kcal = 4186 J]

3. I converted cal. in the snickers bar to kcal and then did .280 kcal/4186 to get joules in one snickers. plugged that in for W but i'm not getting the right answer
you divided by 4186?

eat more snickers bars! :smile:
 
  • #3


Ha oh my goodness...thanks!
 

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