Phys205A_Lecture35

Physics for Scientists & Engineers with Modern Physics (4th Edition)

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 35 Chapter 14 cont. Fluid Mechanics Final: Dec. 10 Wednesday 7:50-9:50
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Pressure z The pressure P of the fluid at the level to which the device has been submerged is the ratio of the force to the area F P A
Background image of page 2
Pressure, cont z Pressure is a scalar quantity z Because it is proportional to the magnitude of the force z If the pressure varies over an area, evaluate dF on a surface of area dA as dF = P dA z Unit of pressure is pascal (Pa) 2 1Pa 1 N/m =
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Measuring Pressure z The spring is calibrated by a known force z The force due to the fluid presses on the top of the piston and compresses the spring z The force the fluid exerts on the piston is then measured
Background image of page 4
??? Suppose somebody accidentally stomps on your foot with the heel of one shoe. Who induces the largest pressure on your foot? 1. a 90 kg, male professional basketball player wearing sneakers. 2. a 90 kg woman wearing spike-heeled shoes. 3. the same
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Density Table
Background image of page 6
Variation of Pressure with Depth z Fluids have pressure that varies with depth z If a fluid is at rest in a container, all portions of the fluid must be in static equilibrium z All points at the same depth must be at the same pressure z Otherwise, the fluid would not be in equilibrium
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Pressure and Depth z Examine the darker region, a sample of liquid within a cylinder z It has a cross-sectional area A z Extends from depth d to d + h below the surface z Three external forces act on the region z Since the net force must be zero: z P = P 0 + ρ gh ˆˆˆ o PA P A Mg
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 27

Phys205A_Lecture35 - Lecture 35 Chapter 14 cont. Fluid...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online