As shown, a weight of mass 5 kg is situated on a piston of diameter D₁ = 120 mm. The piston rides on a reservoir of oil of depth h₁ = 42 mm and specific gravity SG = 0.8. The reservoir is connected to a round tube of diameter D₂ = 5 mm, and oil rises in the tube to height h₂. Find h₂. Assume the oil in the tube is open to atmosphere, and neglect the weight of the piston.

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Weight h2 Oil Piston W h DI