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Physics: Venturi meter readings sphere density.

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1a) A venturi meter has 0.02556m^3 of flow per second through its 45mm dia throat.If the pipe is 58mm in diameter,what will the differential reading of mercury across it be? b)A metal sphere 60mm in dia is submerged in oil with a relative density of 0.9.Need to find the density of the sphere.There is a downward force of 8.31N when the sphere is submerged? need step by step solutions.

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