of energy per
kilogram which is converted to mechanical energy with a 20% efficiency rate.
How much fat will the dieter use up ?
Answer:
(a) Here 
Work done against the gravitational
force,
= 49, 000 J.
(b) Mechanical energy supplied
by 1 kg of fat
= 20% of 
Fat consumed
for 76 x 105 J of energy = 1 kg
Fat consumed for 49,000 J of
energy
.
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