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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
उत्तर
Total energy of a freely falling object remains conserved.
Therefore the answer is, (c) Remains constant
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संबंधित प्रश्न
A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground. Taking g = 10 m s-2, calculate:
- the potential energy possessed by the ball when it is initially at rest.
- the kinetic energy of the ball just before it hits the ground?
Fill in the blank with suitable word :
The ability of a body to do work is called __________. The ability of a body to do work because of its motion is called __________.
Name the device or machine which convert :
Mechanical energy into electrical energy.
Name the device or machine which convert :
Chemical energy into electrical energy.
Name the device or machine which convert :
Electrical energy into heat energy.
Name the device or machine which convert :
Chemical energy into kinetic energy (or mechanical energy).
Write the energy transformations which take place in an electric bulb (or electric lamp).
The hanging bob of a simple pendulum is displaced to one extreme position B and then released. It swings towards centre position A and then to the other extreme position C. In which position does the bob have :
(i) maximum potential energy?
(ii) maximum kinetic energy?
Name the energy transfers which occur when :
an electric ball rings
Name the energy transfers which occur when : there is a picture on a television screen
