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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
State the energy change in the following device while in use:
A glowing electric bulb.
A certain form of energy which is not sourced directly or indirectly from the sun and does not cause any pollution is very easily converted into electricity. This form of energy is, however, not available everywhere. Moreover, it is technically very difficult and expensive to obtain it. Name the form of energy.
Write true or false of the following statement.
The energy of flowing water can be converted into electric energy (electricity).
Name the type of energy (kinetic energy K or potential energy U) possessed in the given case:
An arrow shot out of a bow.
Identify the type of energy possessed by the body in each of the following:
(a) A coiled spring of the toy car
(b) A hammer which is raised
(c) A stone shot from a catapult
(d) Water stored in the overhead tank
(e) A tadpole moving in water.
Show that the quantity 2K/v2 has the unit of mass, where K is the kinetic energy of the body.
A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:
The total energy possessed by the body at any instant? (Take g = 10 ms-2).
Obtain an expression for the potential energy of a body of mass m at a height h above the ground.
State the energy changes which take place when:
Photographic film is exposed to sunlight.
Give one example when:
Chemical energy to electrical energy.
