Advertisements
Advertisements
प्रश्न
No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.
Advertisements
उत्तर
The displacement of the man and box is along the horizontal direction. Thus, the angle between the displacement and the force of gravity is 900;
Thus, W = Fd cos 900 = 0
Hence, no work is done against gravity in this case; however some work is done against friction.
APPEARS IN
संबंधित प्रश्न
State two factors on which the work done on a body depends.
Define the term 'work'. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.
Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.
Is power a scalar quantity?
Name the type of energy possessed by a
(i) stretched catapult (ii) hot iron
(iii) wound up clock
Name the CGS unit of work.
An electric motor pump is 60% efficient and is rated 2.5 H.P. Calculate the maximum load it can lift through a height of 10m in 8 sec. (1 H.P. = 750 W).
A body of mass 0.5 kg travels on straight line path with velocity v = (3x2 + 4) m/s. The net work done by the force during its displacement from x = 0 tox = 2 m is ______.
