every question I can find Flashcards
(19 cards)
Sketch a gaussian curve and write its mathematical formula
do it .
write down the 3D stress tensor for when no stress is present
3 x 3 zero matrix
difference between spring constant and Youngs modulus
spring constant: dependent on spring/material dimensions
Youngs modulus: material property independent of dimensions
What is meant by stress stiffening
As you stress a material, its resistance to deformation increases - seen in biological material such as skin (J shaped curve)
derive eulers critical buckling load formula
gowan
what is the equation for energy of a bending beam
im waiting
what is the relationship between tube stiffness and wavespeed
wavespeed is proportional to root of Youngs modulus
what is the bernoulli equation and what are its clinical uses
- bernoulli equation is derived from energy balance of fluid along different points in a pipe
- assumes total mechanical energy per unit volume remains constant
- applies to steady, laminar flow of an incompressible fluid without viscosity
- can be used to calculate pressure differences across a narrowed artery (stenosis)
derive the velocity profile of a fluid through a pipe and then poiseuilles law LOL
- set up co-ordinates system of an annulus of fluid
- force balance of pressure and shear forces
blood is roughly 1.8 times thicker than water
difference between diastole and systole and what is the resting blood pressure in systole and diastole
diastole: when heart muscle relaxes and blood pressure decreases
systole: when heart muscle contracts and blood pressure increases
systole: 120mmHg
diastole: 80mmHg
define statically determinate
a system in which all internal forces and reactions can be solved using equations of equilibrium
how are the gaussian and normal curve different
the area under the normal curve is equal to one
what is the standard error of the mean
quantifies how much the sample mean is expected to vary from the true population mean
typical dimensions of a red blood cells
width: 7.5 microns
height: 2 microns
difference between homogeneity and isotropy
homogeneity refers to the properties of a material being the same at all points in space whereas isotropy refers the the material having the same properties in all directions
Effect of bifurcations
Increased distal area
decreased distal velocity
decreased distal reynolds number
state the assumptions associated with the derivation of poiseuille equation
assume:
viscous effects are present
flow is steady
flow is laminar
flow is incompressible
what are the assumptions for bernoulli flow?
flow is inviscid
flow is steady state
flow is incompressible
there is no variation of velocity over cross section
