Advertisements
Advertisements
प्रश्न
Define 1 joule of work.
Advertisements
उत्तर
Joule is the SI unit of work. Work done is said to be of 1 Joule when a force of 1 Newton moves a body by 1 m along the direction of the force applied.
APPEARS IN
संबंधित प्रश्न
Derive a relationship between S.I. and C.C.S. unit of work
A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1.
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
State larger units of power.
A coolie is pushing a box weighing 1500 N up an inclined plane 7.5 m long on to a platform, 2.5 m above the ground.
(i) Calculate the mechanical advantage of the inclined plane. (ii) Calculate the effort applied by the coolie.
(iii) In actual practice, the coolie needs to apply more effort than what is calculated. Give one reason why you think the coolie needs to apply more effort.
A is a push or a pull ______.
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
