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प्रश्न
Fill in the blank with suitable word :
The sum of the potential and kinetic energies of a body is called __________ energy.
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उत्तर
The sum of the potential and kinetic energies of a body is called mechanical energy.
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संबंधित प्रश्न
A ball of mass 0.20 kg is thrown vertically upwards with an initial velocity of 20 m s-1. Calculate the maximum potential energy it gains as it goes up.
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.
An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass 3.5 kg. Both the spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same :
Name the device or machine which convert :
Light energy into electrical energy.
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 ___________.
A bulb lights up when connected to a battery. State the energy change which takes place :
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?
What do you understand by the term 'transformation of energy"? Explain with an example.
Name the energy transfers which occur when :
an electric ball rings
When an object falls freely towards the earth, then its total energy :
