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The 73 kg student balances an 1100 kg elephant on a hydraulic lift. Inside the lift is filled with oil and the diameter of the piston the elephant is standing on is 2.0 m and the diameter of the piston the student is standing on is 0.52 m. When a second student joins the first, the height difference between the liquid levels in the right and left pistons is 40cm. What is the second student's mass?

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