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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
Show that the sum of kinetic energy and potential energy (i.e., total mechanical energy) is always conserved in the case of a freely falling body under gravity (with air resistance neglected) from a height h by finding it when
- The body is at the top.
- the body has fallen a distance x.
- the body has reached the ground.
Name the device or machine which convert :
Electrical energy into heat energy.
Name the device or machine which convert :
Light energy into electrical energy.
Fill in the blank with suitable word:
The electricity meter installed in our homes measure electrical energy in the units of ___________.
Fill in the blanks with suitable words:
When a ball is thrown upwards, ___________ energy is transformed into ___________ energy.
Five electric fans of 120 watts each are used for 4 hours. Calculate the electrical energy consumed in kilowatt-hours.
What do you understand by the term 'transformation of energy"? Explain with an example.
Name the energy transfers which occur when : a torch is on
A ball falls to the ground as shown below :
What is the potential energy of ball at B?
When an object falls freely towards the earth, then its total energy :
