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प्रश्न
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in a car going uphill.
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उत्तर
- Kinetic energy to potential energy (because the vehicle is approaching a specific height).
- Chemical energy to Kinetic energy (because the car is in motion).
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संबंधित प्रश्न
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in the Charging of a battery.
State the energy changes in the following case while in use:
a steam engine
State the energy changes in the following case while in use:
Burning coal
State the energy changes in the following case while in use:
A solar cell
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?
Explain conservation of energy.
Is it possible that an object is in a state of accelerated motion due to external force acting on it, but no work is being done by the force? Explain it with an example.
If an electric iron of 1200 W is used for 30 minutes every day, find electric energy consumed in the month of April.
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
