Advertisements
Advertisements
प्रश्न
How much energy is gained by a box of mass 20 kg when a man, carrying the box waits for 5 minutes for a bus?
Advertisements
उत्तर
Mass of box = 20 kg
t = 5 minutes
Energy gained = force applied = 0
∵ Zero work is done, as there is no displacement of the man.
APPEARS IN
संबंधित प्रश्न
Work done by a boy depends on the time in which he does work.
1 J = ______ calorie.
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B does the same in 15 s. Compare the work done.
.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.
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.
Give two examples of couple action in our daily life.
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.
Is power a scalar or a vector quantity?
