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?© BrainMass Inc. brainmass.com March 5, 2021, 12:29 am ad1c9bdddf
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
- where P is the atmospheric pressure, A is the cross section of the tube, m is the mass of ...
We solve two physics problems involving air pressure.