Physics Flashcards
types of heat transfer
- conduction
- convection
- radiaton
Radiation heat transfer consists of
heat transfer due to electromagnetic waves
conduction heat transfer consists of
heat transfer due to direct contact
Conduction heat transfer consists of
heat transfer due to bulk flow movement.
Pressure at a given depth is called
hydrostatic pressure
Gases and Liquids are what kind of material?
Liquids
Density definition
Mass/volume
density of water is what?
1 g/mL = 1 g/cm^3 = 1 kg/L
Define specific Gravity
density of some liquid / density of water.
specific gravity = density of liqid/density of water
specific gravity of water is 1
Archimedes principle: define
the buoyant force on an object= weight of the fluid displaced by the object
Fb= weight displaced= ( mass displaced)(g) = ( density of fluid)(Volume submerged)(g)
What are the situations when comparing Fb to Weight such that it will float, sink or rise upward.
when FB = W , the object will float
when FB > W, the object will rise upward
when FB < W, the object will sink
Define hydrostatic pressure
if you apply pressure on a liquid, the pressure is transmitted equally to all parts of the liquid ( this is called pascal’s law)
Gauge Pressure
pgh because it igmore the atmosphereic pressure above the fluid….. it measures the amount of pressure beneath the surface.
Absolute pressure
is basically the pressure of something submerged in the ocean = pgh + atmospheric pressure
Pabs=Po + pgh
Continuity Equation
A*V=constant.
volume rate of a fluid is constant.
Surface tension is caused by what?
due to the attraction between molecules of the solvent.
Surface tension is caused by what?
due to the attraction between molecules of the solvent.
Stress definition
pressure exerted on an object F/A
Strain definition
the deformation of the object in the direction of the applied force divided by the original length
strain = Change in length/ inital length
Thermal expansion coefficient
alpha
when objects are cooled down or expanded, the object changes shape.
change in length = aloha * inital length * change in temperature.
MNEUMONIC + looks like alot
Chnage in volume Beta = 3* alpha
what do liquids and solids share in common and that seperates gases?
solids and liquids= incompressible
gases= compressible.
Adiabatic means what
- no heat transfer therefore it affects the internal temperature.
words to look for : quickly and rapidly
in an adiabatic compresion, temperature will…
increase
in an adiabatic expansion, temperature will
decrease