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Wave and tidal energy:
Waves and tides are another source of energy which is perpetual and can be converted into electric energy, particularly where sea water can move into a narrow cut, such as is provided naturally where rivers flow into the sea. Energy carried by water has also been widely used in India's hilly regions, since a wheel with pedals can be made to turn when it is put in a fast flowing strehm. Flour mills of small size built on this principle were used in Kashmir for long time. In fact, large "hydroelectric" power stations work on the same principle. A natural or artificial water fall is made to turn a modem kind of pedal wheel, called a turbine, which rotates and causes electricity to k generated.
Another way to show that air expands when heated Snap a toy balloon over the neck of a small bottle and place the bottle in a pan of warm water.
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prove work is a path function
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