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प्रश्न
State the energy changes which take place when:
A magnesium ribbon burns in air.
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उत्तर
During the burning of magnesium, chemical energy changes to heat and light energy.
संबंधित प्रश्न
Give one relevant example for the following transformation of energy :
Chemical energy to light energy.
Name the energy changes for the following:
electric ball
How much hydro-electric power is generated in India?
State two advantages and two disadvantages of using hydro-energy for producing electricity.
State the energy changes which take place when:
A bulb glows, when torchlight is switched on.
Give one example when:
Heat energy changes to kinetic energy.
A ball of mass 50 g falls from a height of 2m and rebounds from the ground to 1.6 m. Find:
(i) The potential energy possessed by the ball when initially at rest.
(ii) The kinetic energy of the ball before it hits the ground.
(iii) The final potential energy of the ball.
(iv) The loss in kinetic energy of the ball on collision. (Take: g = 10N kg−1)
Use your brain power!
How do we save fuel by using public transport?
Unit of calorific value of a substance is ____________.
