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Safari File Edit View History Bookmarks Window Help session masteringphysics com 1111 Fall 15 signed in as sanjay Tactics Box 13.1 Hydrostatics ydinosta ics Box 13,1 Hydrostatics 1. Draw a picture. Show open surfaces, pistons, boundaries, and other features that affect pressure. Include height and are measurements and fluid densities identify the points at which you need to find the pressure. These objects make up the arning Goal: environment is everything else. 2. Determine the pressure po at surfaces. practice Tactics Box 13.1 Hydrostatics. Surface open to the air po patmu A, usually 1 atm. problems about liquids in hydrostatic equilibrium, you Surface in contact with a gas: po pEu en need to find the pressure at some point in the closed surface pe F/A, where Fis the force the surface, such as a piston, exerts on the fluid and A s he a ud. This Tactics Box outlines a set of rules for thinking of the surface. out such hydrostatic problems. 3. Use horizontal lines. The pressure in a connected fluid (of one kind) is the same at any point along a honzontal line. 4- Allow for gauge pressure. Pressure gauges read p p i atm. 5. Use the hydrostatic pressure equation: p po pgh, where p is the density of the nuid, g is the acceleration due to and h is the height of the fuid. ture 1 of 1 Use these rules to work out the following problom: AU-shaped tube is connected to a box at one end and open to the air at the ot is full of gas at pressure pa, and the tube is fled with mercury of density 1.36x104 kg/ When the liquid in the tube reache the mercury column is h13 120 cm high in the left arm and h2 6.00 cm high in the right arm, as shown in the figu What is gas pressure P inside the box? Peas Part A Find the pressures PA and Pa at surfaces A and B in the tube. respectively. Use palmas to denote atmospheric pressure Express your answers, separated by a comma, in terms of one or both of the variables pau and p.ms PA Pa

Explanation / Answer

Point B is open to atmosphere.

So, Pb = Patmos

Also, Pa = Pb <----- for equilibrium

So, Pa = Pb = Patmos

So, Pa, Pb = (Patmos, Patmos)

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