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A mass m₁ = 70 kg is balanced by a mass m2 = 1200 kg on an oil hydraulic lift. The diameter of
the piston on which mass m2 is standing on is d₂ = 2m.
(1) What is the diameter d₁ of the piston on which mass m₁ is standing?
(2) A third mass m3 is added on top of mass m₁. The piston sinks 35 cm. Determine m3.

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