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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 the burning of a match stick.
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उत्तर
Chemical energy changes into heat and light energy.
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संबंधित प्रश्न
What are the various energy transformations that occur when you are riding a bicycle?
State the energy changes in the following while in use An electric oven.
State the energy changes in the following while using an electric motor.
Fill in the blank
Green plants convert _________ energy into chemical energy.
State the energy changes that occur in the following :
Lighting of a torch bulb.
State the energy changes in the following case while in use:
Bio-gas burner
Choose the odd one:
A boy is moving on a straight road against a frictional force of 5 N. After travelling a distance of 1.5 km he forgot the correct path at a roundabout (Fig. 11.1) of radius 100 m. However, he moves on the circular path for one and half-cycle and then he moves forward up to 2.0 km. Calculate the work done by him.
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
