Advertisements
Advertisements
प्रश्न
.A man raises a box of mass 50kg to a height of 2m in 20s, while another man raises the same box to the same height in 50s. Compare:
(i) the work done, and
(ii) the power developed by them.
Advertisements
उत्तर
(i) Work done to raise the block of mass 50kg is same for both.
(ii) Power= Work done/time. As the time taken by the first man is less therefore power developed is more.
संबंधित प्रश्न
Define 1 J of work.
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
What happens to the work done when the dispacement of body is at right angles to the direction of force acting on it? Explain your answer.
Give two examples of work done.
Distinguish between work and power.
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?
