Home
Class 11
PHYSICS
A person trying to lose weight lifts a 1...

A person trying to lose weight lifts a 10 kg mass, one thousand times, to a height of 0.5m each time. Assume that the P.E. lost each time the person lowers the mass is dissipated.
How much work does the person do against the gravitational force?

Text Solution

Verified by Experts

`= 49, 000J`
Promotional Banner

Similar Questions

Explore conceptually related problems

A person trying to lose weight lifts a 10 kg mass, one thousand times, to a height of 0.5m each time. Assume that the P.E. lost each time the person lowers the mass is dissipated. Fat supplies 3.8xx10^(7) J of energy per kg which is converted to mechanical energy with a 20% efficiency rate. How much fat will the dieter use up?

An engine develops 10 kW power. How much time will it take to lift a mass of 200 kg to a height of 40 m ?

Two persons manage to push a motorcar of mass 1200 kg at a uniform velocity along a level road. The same motorcar can be pushed by three persons to produce an acceleration of 0.2 ms^(-2) . With what force does each person push the motor car ?

In Millikan's oil drop experiment. What is the terminal speed of an uncharged drop of radius 2.0 times 10^-5 m and density 1.2 times 10^3 kg m^-3 . Take the viscosity of air at the temperature of the experiment to be 1.8 times 10^-5 Pa s . How much is the viscosity force on the drop at that speed? Neglect buoyancy of the drop due to air.

A rocket with a lift-off mass 3.5 xx 10^(4) N kg is blasted upward with an initial acceleration of 10 m//s^(2) . Then the initial thrust of the blast is:

A stationary body of mass 3 kg explodes into three equal pieces. Two of the pieces fly off at right angles to each other, one with a velocity of 2 i m/s and the other with a velocity of 3 j m/s. If the explosion takes place in 10^(5)s , the average force acting on the third piece in newton is: