# physics

The 80kg student balances a 1300kg elephant on a hydraulic lift. (U-Tube)
What is the diameter of the piston the student is standing on?
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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1. I do not know. All I know is the ratio of areas.

80 (pi r^2) = 1300 (pi R^2)

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posted by Damon
2. By the way to do the second one you must know the density of the fluid.
These are very strange questions. Are you sure you have copied them correctly?

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posted by Damon
3. Its 900kg/m^3 for the density of liquid I think.

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posted by Lee

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