3.20 As shown, a load of mass 10 kg is situated on a piston of diameter D1 140 mm. The piston rides on a reservoir of oil of depth h1 42 mmand specific gravity S 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 mass of the piston. Weight h2 Oil Piston D1 PROBLEMS 3.19, 3.20

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British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.