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प्रश्न
State the energy changes which take place when:
Burning of coal.
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उत्तर
The chemical energy changes into heat energy.
संबंधित प्रश्न
Define the term kinetic energy. Give one example of a body which possesses kinetic energy.
Name the type of energy (kinetic energy K or potential energy U) possessed in the given case:
An arrow shot out of a bow.
A hydroelectric power station takes its water from a lake whose water level is 50 m above the turbine. Assuming an overall efficiency of 40%, calculate the mass of water which must flow through the turbine each second to produce power output of 1 MW. (Take g = 10 m s−2).
Name the energy changes for the following:
electric ball
Name the energy changes for the following:
bicycle brakes
Show that the quantity 2K/v2 has the unit of mass, where K is the kinetic energy of the body.
A metal ball of mass 2kg is allowed to fall freely from rest from a height of 5m above the ground.
What the kinetic energy of the ball just before it hits the ground ?
What kind of energy is possessed in a situation when?
A horse running along a level road
Give three examples of bodies possessing potential energy.
Can you tell?
Describe one natural chain of transformation of energy.
