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प्रश्न
Fill in the blanks with suitable words :
The principle of ___________ of energy says energy can be transformed from one form to another, but it cannot be ___________ or ___________.
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उत्तर
The principle of conservation of energy says energy can be transformed from one form to another, but it cannot be created or destroyed.
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संबंधित प्रश्न
A ball is placed on a compressed spring. What form of energy does the spring possess? On releasing the spring, the ball flies away. Give a reason.
A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:
- the potential energy at the greatest height,
- the kinetic energy on reaching the ground, and
- the total energy at its half-way point.
Give two examples where a body possesses both, kinetic energy as well as potential energy.
Name the device which converts electrical energy into mechanical energy.
Name the device or machine which convert :
Mechanical energy into electrical energy.
Name the device or machine which convert :
Light energy into electrical energy.
Name the device or machine which convert :
Chemical energy into kinetic energy (or mechanical energy).
What is the meaning of the symbol kWh? What quantity does it represent?
A ball falls to the ground as shown below :
Which law you have made use of in answering this question?
When an object falls freely towards the earth, then its total energy :
