You are at gym and working out. You are lifting weight. What is the work for lifting 30 pounds weight for 1 foot? How much energy or calories will you burn if you do this exercise for 10 minutes and you do it 500 times? Although it looks impossible :-)
Solution:
Work for lifting a weight @ gym :
30 lbf lifted 1 ft = 30 * 1 = 30 lbf-ft = 30 * 1.3558 = 41 J
Total work including 500 times lifting = 41 * 500 = 20,500 J
Power = 34 J/sec = Watts or 5 kcal
Assuming the human body efficiency in converting the Fat to exercise of 0.25
Power converted to to burned fat = 5 / 0.75 = approximately 7 Kcal
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