# Shared Flashcard Set

## Details

Physics - Fluids
MCATs
26
Physics
07/07/2012

Term
 density eq.
Definition
 ρ = m/v   p- density
Term
 desnity of liquid water
Definition
 1000 kg/m3 or 1 g/cm3 or 1 kg/L
Term
Definition
 sp. gr. = p/pH2o   specific grav = density of substance/density of water   pH20- 1 kg/L
Term
 Force of grav on fluid eq.
Definition
 Fgrav=mg=pVg   p-density V-volume g-grav
Term
 Pressure eq. with regard to force and area
Definition
 P = F / A   force (perpendicular)/area P in (Pa)
Term
 Hydrostatic Gauge Pressure eq.
Definition
 Pgauge=PfluidDg   D-depth of object
Term
 Eq. for Ptotal when atmospheric and hydrostatic pressure both applicable. eq. when lid closed off from atmosphere, but layer of gas above surface of water.
Definition
 both atmospheric and hydrostatic applicable: Ptotal=Patm + Pgauge   lid closed but layer of gas: Ptotal=Pat surface + Pgauge
Term
 describe when/if hydrostatic gauge pressure and total pressure is proportional to depth and density of fluid.
Definition
 hydrostatic gauge pressure is proportional to depth and desnity of fluid   Total pressure is not proportional to depth and desnity of fluid if Pat surface isn't zero.
Term
 Archimedes' bouyancy principle and eq.
Definition
 magnitude of buoyant force equal to weight of fluid displaced by object   Fbuoy= pfluidVsubg = wobject   Vsub-volume submerged wobject- weight of object
Term
 Floating objects in equilibrium on surface eq.
Definition
 wobject = Fbuoy Vsub/V = pobject/pfluid   pobject < pfluid : floats
Term
 apparent weight eq.
Definition
 wapparent = w - FBuoy
Term
 true weight eq.
Definition
 w = pobjectVg
Term
 How force, area and distance relate in hydraulics
Definition
 F1/A1=F2/A2 A1d1=A2d2 F2d2=F1d1
Term
 surce tension eq.
Definition
 Fsurfacetension=2γL   γ-coefficent of ST L-legnth
Term
 Flow Rate
Definition
 f=Av   A-area v-volume
Term
 How does flow rate in a pipe change when a fluid is incompressable?
Definition
 It doesn't. When fluid incrompressable, flow rate stays the same everywhere in pipe.
Term
 continuity eq.
Definition
 A1V1=A2V2   A-area=diameter2=∏r2
Term
 Bernoulli's law and eq. for ideal fluids.
Definition
 -incompresable -negligable viscosity -steady flow rate - laminar flow (stream lines don't cross, flows smoothly)   P1 + .5pv12 + pgy1 = P2 + .5pv22+pgy2 y-height
Term
 Torricelli's result eq.
Definition
 vefflux = √(2gD)   vefflux - water shooting out hole D - distance from surface of liq to hole
Term
 pressure in realation to flow speed
Definition
 pressure lower where flow speed greater
Term
 equation for and explanation of young's modulus
Definition
 E=(F/A)/(ΔL/L) = stress/strain   E - elastic modulus or young's modulus. -a constant for a given material and a measure of its strength
Term
 based on young's modulus, what would a graph of stress over strain look like?
Definition
 [image]
Term
 What equation would you use to solve a question about the curshing mass needed to cause a % change in legth in a bone when the bones area is given? the compressive strength is also given.
Definition
 you'd rearange young's modulus eq. so that: F= (ΔL/L)AE=mg and solve for m
Term
 What unit is Young's modulus in?
Definition
 Pa
Term
 eq. for gravitational potential energy
Definition
 PEgrav= mgh
Term
 If two objects are submerged in a fluid at the same depth, compared to the smaller object, will the larger one expereince larger or less fluid pressure?
Definition
 Equal pressure. the pressure due to a fluid is independent of the size of the object. Pfluid=ρgd   P- pressure ρ-density of fluid g- grav d - depth of object
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