Brain Power The human brain consumes about 22W of power under normal conditions, though more power may be required during exams.
Question 1
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]
Question 2
At what rate must you lift a 3.6-kg container of milk (one gallon) if the power output of your arm is to be 22 W?
Question 3
How long does it take to lift the milk container through a distance of 1.0 m at this rate?