Advertisements
Advertisements
प्रश्न
Advertisements
उत्तर
APPEARS IN
संबंधित प्रश्न
Give reasons for the following A teacher moving around in the class is doing work but a child standing and reading a book is not doing any work.
Differentiate between energy and power.
.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.
A person of mass 50 kg climbs a tower of height 72 metres. Calculate the work done. (g = 9.8 m s−2).
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.
The work done by a force acting obliquely is given by the formula : W = F cos θ ✕ s. What will happen to the work done if angle θ between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant.
Is work done a scalar or a vector physical quantity?
How fast should a boy weighting 30 kg run so that his kinetic energy is 375 joule?
The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
