A person trying to lose weight (dieter ) lifts a 10 kg mass through 0.5m, 1000
Channel: Doubtnut
Date: 2020-07-26

A person trying to lose weight (dieter ) lifts a 10 kg mass through 0.5m, 1000 times, A ssume that the potential energy lost each time she lowers the mass is dissipated (a) How much work does she does against the gravitational force ? (b) Fat supplies `3.8xx10^(7) J` of energy per kilogram which is converted to mechanical energy with a `20%` efficiency rate. How much fat will the dieter use up ?