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प्रश्न
When an object falls freely towards the earth, then its total energy :
विकल्प
increases
decreases
remains constant
first increases and then decreases
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उत्तर
Total energy of a freely falling object remains conserved.
Therefore the answer is, (c) Remains constant
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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.
What kind of energy is possessed by the following?
A stretched rubber band _____________
Define the term 'energy' of a body. What is the SI unit of energy.
What are the various forms of energy?
Name the device or machine which convert :
Heat energy into kinetic energy (or mechanical energy).
Fill in the blank with suitable word:
The electricity meter installed in our homes measure electrical energy in the units of ___________.
What kind of energy transformations take place at a coal-based thermal power station?
Describe the energy changes which take place in a radio.
What is the meaning of the symbol kWh? What quantity does it represent?
Name the energy transfers which occur when :
someone speaks into a microphone
