Physics 121: Fundamentals of Physics I

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Physic 121 Phundament ls ofPhy ics IDecember 1 2006D Roberts University of Maryland PHYS 121.
Chapter 9Solids andD Roberts University of Maryland PHYS 121 Pressure The force exerted by a.
fluid on a submergedobject at any point ifperpendicular to thesurface of the objectP in Pa 2.
D Roberts University of Maryland PHYS 121 Pressure and Depth Examine the darker region assumed to be a fluid It has a cross sectional area A.
Extends to a depth h belowthe surface Three external forces act onthe regionD Roberts University of Maryland PHYS 121.
Pressure and Depth equation Po is normal atmospheric 1 013 x 105 Pa 14 7 lb in2 The pressure does notdepend upon the shape.
of the containerD Roberts University of Maryland PHYS 121 Pascal s Principle A change in pressure applied to an enclosedfluid is transmitted undimished to every point of.
the fluid and to the walls of the container First recognized by Blaise Pascal a French scientist 1623 1662 D Roberts University of Maryland PHYS 121 Pascal s Principle cont.
The hydraulic press is animportant application of Pascal s Also used in hydraulic brakes forklifts car lifts etc D Roberts University of Maryland PHYS 121.
A container is filled with oil and fitted on both ends withpistons The area of the left piston is 10mm2 that of theright piston 10 000 mm2 What force must be exertedon the left piston to keep the 10 000 N car on the rightat the same height .
17 17 17 17 17 17 2 100 N 303 10 000 N6 Insufficient information Pressure Measurements Manometer.
One end of the U shapedtube is open to theatmosphere The other end isconnected to the pressure.
to be measured Pressure at B is Po ghD Roberts University of Maryland PHYS 121 Pressure Measurements Barometer Invented by Torricelli 1608 .
A long closed tube is filled withmercury and inverted in a dishof mercury Measures atmosphericpressure as gh.
D Roberts University of Maryland PHYS 121 Archimedes 287 212 BC Greek mathematician physicist and engineer.
Buoyant force InventorD Roberts University of Maryland PHYS 121 Archimedes Principle Any object completely or partially submerged in.
a fluid is buoyed up by a force whose magnitudeis equal to the weight of the fluid displaced bythe object D Roberts University of Maryland PHYS 121 Buoyant Force.
The upward force is called thebuoyant force The physical cause of thebuoyant force is the pressuredifference between the top and.
the bottom of the objectD Roberts University of Maryland PHYS 121 Buoyant Force cont The magnitude of the buoyant force alwaysequals the weight of the displaced fluid.
The buoyant force is the same for a totallysubmerged object of any size shape or densityB fluidVfluid g wfluidD Roberts University of Maryland PHYS 121 Buoyant Force final.
The buoyant force is exerted by the fluid Whether an object sinks or floats depends onthe relationship between the buoyant force andthe weightD Roberts University of Maryland PHYS 121.
Archimedes Principle Totally Submerged Object The upward buoyant force is B fluidgVobj The downward gravitational force isw mg objgVobj The net force is B w fluid obj gVobj.
D Roberts University of Maryland PHYS 121 Totally Submerged Object The object is less densethan the fluid The object experiences a.
net upward forceD Roberts University of Maryland PHYS 121 Totally Submerged Object 2 The object is more densethan the fluid.
The net force is The object acceleratesD Roberts University of Maryland PHYS 121 Archimedes Principle Floating Object The object is in static equilibrium.
The upward buoyant force is balanced by thedownward force of gravity Volume of the fluid displaced corresponds to thevolume of the object beneath the fluid levelD Roberts University of Maryland PHYS 121.
Archimedes Principle Floating Object cont The forces balance obj Vfluid fluid VobjD Roberts University of Maryland PHYS 121.
A ball floats on water as seen in the photograph below but will sinkwhen put into mineral spirits The water is dyed green with foodcoloring to distinguish it from the clear mineral spirits Note how farthe floating ball sinks into the water When the mineral spirits is poured slowly onto the top of the water it.
will remain on top because the two fluids are immiscible If the mineral spirits is poured slowly on top of the water while theball is floating on the water what will happen to the level at which theball floats 1 The ball will float lower in the 30 33 33 33 .
2 The ball will float higher out of3 The ball will float at the samelevel with respect to thesurface of the water after themineral spirits are poured on.
top of the waterPhysic² 121: Phundament°ls of Phy²ics I December 1, 2006 Chapter 9 Solids and Fluids Pressure The force exerted by a fluid on a submerged object at any point if perpendicular to the surface of the object Pressure and Depth Examine the darker region, assumed to be a fluid It has a cross-sectional area A Extends to a depth h below the surface Three external forces act on the region Pressure ...

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