Advertisements
Advertisements
प्रश्न
A boy of mass m climbs up a staircase of vertical height h.
- What is the work done by the boy against the force of gravity?
- What would have been the work done if he uses a lift in climbing the same vertical height?
Advertisements
उत्तर
- When a boy with mass m climbs a staircase with a vertical height of h, he works against gravity by using his own weight, F = mg and W = F x h.
- Because displacement occurs in the direction of force, W = mgh in both scenarios.
संबंधित प्रश्न
Why is the work done on an object moving with uniform circular motion zero?
Draw a neat labeled diagram to show the direction of two forces acting on a body to produce rotation in it. Also mark the point about which rotation takes place.
What is the SI unit of work?
What is the ratio of SI units to CGS units of 'work'?
Name the type of energy possessed by a
(i) stretched catapult (ii) hot iron
(iii) wound up clock
An electric motor drives a machine which lifts a mass of 4 kg through a height of 10 m in 5 s at a constant speed. Assuming g = 10 ms-2, calculate
(i) the amount of work done, (ii) the power of the machine.
Fill in the boxe to show the corresponding energy transformation.
Give an example
Electrical energy changes of sound energy.
Explain, why submarines are able to dive underwater as well as a sail on the surface of the water?
What is the difference between renewable and non-renewable resources?
