Advertisements
Advertisements
प्रश्न
State the energy changes in the following case while in use:
a steam engine
Advertisements
उत्तर
Heat energy into mechanical energy.
APPEARS IN
संबंधित प्रश्न
State the energy changes in the following case while in use:
A ceiling fan
State the energy changes that occur in the following :
The unwinding of a watch spring.
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in photosynthesis in green leaves.
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in respiration.
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in the Explosion of crackers.
A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground. What happens to the mechanical energy after the ball hits the ground and comes to rest?
Can any object have mechanical energy even if its momentum is zero? Explain.
The velocity of a body moving in a straight line is increased by applying a constant force F, for some distance in the direction of the motion. Prove that the increase in the kinetic energy of the body is equal to the work done by the force on the body.
Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it.
(a) How much work is done by the men in lifting the box?
(b) How much work do they do in just holding it?
(c) Why do they get tired while holding it? (g = 10 m s–2)
State the energy changes in the following case while in use:
A glowing electric bulb
