Advertisements
Advertisements
प्रश्न
A machine raises a load of 750 N through a height of 16 m in 5s. calculate:
(i) work done by machine,
(ii) power at which the machine works.
Advertisements
उत्तर
Given, load m = 750 N, displacement h = 16 m, time = 5 s, g = 10 N kg -1
now work done = mgh = 750 x 16 = 12000J
or power = `"work done"/"time taken" = 12000/5` = 2400 watt
APPEARS IN
संबंधित प्रश्न
In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east, as shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or 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.
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
Name the physical quantity associated with the 'rate of doing work'.
A bullet is of mass 'm' g and is moving with a velocity 'v' m/s. Find the kinetic energy of the bullet when
(a) The mass is doubled,
(b) The velocity is tripled.
Fill in the boxe to show the corresponding energy transformation.
A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate: the speed of the body.
One labourer carried four pans of road metal through a distance of 100 metres. If he carries two pans of road metal through a 200 metre distance ______ work will be done.
Work done by this force at any instant is ______.
