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    Calculating Mercury Rising and Applied Force

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    I'm having trouble completing these practice problems.

    1. A barometer is made from a closed tube inserted (closed end up) into a pool of mercury (density = 13.6 g/cm^3). The pool of mercury is open to the air. How high does the mercury rise in the closed tube?

    2. A hydraulic lift is used to lift a 1,300 kg car has a diameter of 25 cm. A mechanic pushes down on a 6.0 cm plunger attached to the lift. How much force must the mechanic apply to lift the car?

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    Solution Preview

    1. The weight of the mercury inside the tube counteracts the pressure difference between the air outside the tube and the vacuum inside the tube. We have

    PA = mg
    = dVg
    = dAhg

    - where P is the atmospheric pressure, A is the cross section of the tube, m is the mass of ...

    Solution Summary

    We solve two physics problems involving air pressure.