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प्रश्न
Name the energy transfers which occur when :
an electric ball rings
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उत्तर
An electric bell converts electrical energy to sound energy.
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संबंधित प्रश्न
A body falls freely under gravity from rest. Name the kind of energy it will possess while falling.
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.
A boy weighing 40 kg makes a high jump of 1.5 m.
What is his kinetic energy at the highest point?
Define the term 'energy' of a body. What is the SI unit of energy.
Name the device or machine which convert :
Chemical energy into kinetic energy (or mechanical energy).
Explain the transformation of energy in the following cases :
(i) A ball thrown upwards.
(ii) A stone dropped from the roof of a building.
Name the energy transfers which occur when :
someone speaks into a microphone
When an object falls freely towards the earth, then its total energy :
The device which converts mechanical energy into energy which runs our microwave oven is :
A microphone converts :
