Question

give reason that water sprinkle used for grass lawns begins to rotate as soon water is supplied

Answer 1

here is your answer mate-
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the woater sprinkle used for grass lawns begins to rotate as soon water is suplied because of mass or weight of water and also matters with density
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Answer 2

Answer:

It is based on the Newton's third law of motion. As soon as the water comes out from the nozzle of the sprinkler, an equal and opposite reaction force acts on the nozzle. Due to this reaction force, the sprinkler starts rotating.