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A bucket containing water is revolved in a vertical circle of radius 4 m, such that water does not fall even when the bucket is upside down. The bucket is moving with minimum constant speed. Calculate the period of revolution (in second).

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HS rank holder and JU pass out engg with 15 years of experience as private tutor of Physics

From FBD of the bucket at highest position of circle we get, mg = mw²r or, w = √g/r or, 2πn = √g/r or, n = 1/2π√g/r
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