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प्रश्न
Give an example
Chemical energy changes to heat energy.
एक शब्द/वाक्यांश उत्तर
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उत्तर
Candle flame
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संबंधित प्रश्न
Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1.
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
Give two examples of work done.
Complete the following sentences:
1 H.P. = ........ W.
Name the physical quantity which is equal to the energy of a body.
In what form is energy stored in a wrist watch?
A block of iron of mass 400 kg is used as a pile driver. If it is raised to a height of 20 meters, calculate the potential energy possessed by the iron block. (Assume g= 10 ms-2).
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Suma is swimming in a pond.
