Work Power and Energy 5 Question 3
5. A person trying to loose weight by burning fat lifts a mass of upto a height of times. Assume that the potential energy lost each time he lowers the mass is dissipated. How much fat will he use up considering the work done only when the weight is lifted up? Fat supplies of energy per which is converted to mechanical energy with a efficiency rate. (Take, )
(2016 Main)
(a)
(b)
(c)
(d)
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Answer:
Correct Answer: 5. (d)
Solution:
- Work done in lifting mass
If
Equating the two, we get