Home
Class 11
PHYSICS
A person trying to lose weight (dieter) ...

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

Promotional Banner

Similar Questions

Explore conceptually related problems

The potential energy of a body of mass 'm' placed at a height h is

What is the potential energy of an object of mass 'm' at a height 'h'?

How does the gravitational force between two objects depend upon their masses?

An electric heater is rated 1500 W. How much energy does it use in 10 hours?

A man of mass 60 kg walks up to the top of a building of height 15 m. Calculate the increase in potential energy.

An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half way down.

Find the potential energy of a system of four particles each of mass m placed at the vertices of a square of side I .

How binding energy related with mass defect?

A steam engine delivers 5.4 xx 10^8 J of work per minute and services 3.6 XX 10^8 J of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute?

How much work does a boy of mass 50kg do when he climbs a height 30 metre.