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प्रश्न
Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?
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उत्तर
- No, when we push a huge rock with all our strength but cannot move it, there is no transfer of energy.
- When we push the rock, our muscles tense and blood is displaced very rapidly to these muscles.
- These changes consume energy and we feel tired.
संबंधित प्रश्न
A body falls freely under gravity from rest. Name the kind of energy it will possess while falling.
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.
State whether the object possess kinetic energy, potential energy, or both :
A flying aeroplane _______________.
Name the device or machine which convert :
Electrical energy into sound energy.
Name the device or machine which convert :
light energy into heat energy.
Fill in the blanks with suitable words:
When a ball is thrown upwards, ___________ energy is transformed into ___________ energy.
What kind of energy transformation take place at a hydroelectric power station?
Name the energy transfers which occur when an electric ball rings.
Which one of the following is not the unit of energy?
How much energy does a 100 W electric bulb transfer in 1 minute?
