Work, Energy and Power: JEE Main 2016 Physics question

JEE Main 2016 · Session, Shift 1 · Q8575

JEE Main 2016Session, Shift 1PhysicsMediumWork, Energy and Power70× since 2002

A person trying to lose weight by burning fat lifts a mass of

10

kg

upto a height of

1

m

1000

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

3.8 \times {10^7}J

of energy per

kg

which is converted to mechanical energy with a

20\%

efficiency rate. Take

g = 9.8\,m{s^{ - 2}}

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JEE Main 2016 Work, Energy and Power Question with Solution (Session Shift 1, Q8575) | JEE Arc