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Introduction to Physics > Physics exam 3 > Flashcards

Physics exam 3 Flashcards

1
Q

moving fluids

A

fluids that are incompressiable, they are going to be true for liquids

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2
Q

laminet flow

A

steady flow, it is going to be tangent to the streamline and it can’t cross the steam line

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3
Q

turbulent flow

A

flow that is not going to be steady

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4
Q

viscosity

A

it is the resistance to the flow, it is going to depend on the reynolds number

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5
Q

Viscosity equation

A

Re= Inertial force/ Viscous force
if there is going to be a high Re then you are able to ignore the viscosity, if the Re is going to low than it is dominated by the viscocity.

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6
Q

Equation for continuity

A

V1 = V2 therefore the A1V1 =A2V2
this means that where there is a lower area the velocity is going to high, and when there is a greater higher than the velocity is going to be low

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7
Q

Bernoulli’s equation use

A

relationship between the pressure and the velocity

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8
Q

Bernoulli’s equation

A

p1 +(1/2pv1^2)+pgh1=p2+(1/2(pv2^2)(pgh2)

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9
Q

Bernoulli’s equation for static fluids

A

v1 and the v2 are going to be zero

p1+pgh1=p2+pgh2

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10
Q

Bernoulli’s equation for constant depth

A

p1+1/2pv1^2=p2+1/2pv2^2

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11
Q

what is going to happened in the b’s equation if the velocity increases

A

the pressure is going to decrease and the velocity is going to increase

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12
Q

poiseuille’s law use

A

investigates the factors that affect the fluid flow rate, and it is going to discribe the laminar flow through the tube

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13
Q

Poiseuille’s law

A 
Q=p2-p1(pir^4)/8nl
p is going to be the pressure
r is going to be the radius
n is going to be the fluid viscosity
l is going to be the length if the tube
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14
Q

motion of an object in a viscous fluid

A 
N'r=pvL/n
p is density
v is the speed of the fluid
L is the length of the object
n is the viscosity
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15
Q

temperature

A

measure of the thermal energy

when it is going to be gases they are going to move around and the higher temperature is going to cause a

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16
Q

the higher temperature

A

higher kinetic energy and the t is proportional to the average energy of each of the particles

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17
Q

scales of temperature

A

ferenheight, Celsius, and kelvin

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18
Q

Tf

A

=9/5Tc+32

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19
Q

Tc

A

= Tk-273

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20
Q

thermal expansion( increase energy

A

heat it, and it is going to get bigger

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21
Q

change in the length

A

delta L= original L*constant *change in temperature

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22
Q

thermal increase in a 3d

A

change in volume= constantvolumechange in temperature

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23
Q

phase diagram

A

phase of a material, it is going to change because of the increase in temperature

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24
Q

phase changes

A

it is going to cause it move from one phase to another phase. It is not going to increase the temperature.

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25
triple point
it is going to be a point where it is going to be a solid, liquid, and gas
26
heat
thermal energy change from one object to another
27
Equation for heat
``` Q=Mc(deta t) Q is the heat flow m is th mass c is the heat capacity t is the deta change in temperature ```
28
what is the equation of heat when there is a phase change?
Q=(+/-)ML + is going to be when you add heat->s-l - is going to be when you are going to loss heat ->l-s
29
calometer
heat transfer b/w the two systems
30
final temperature with a calometer
T=(MwCwTw)+(MlClTl)/(MwCw+mlCl)
31
phase changes
McDeltal +mL=McCl delta t
32
conduction
(ka/l)(delta t)
33
convection
transfer of heat from one phase to another
34
radiation
heat is transfered from one form to light | Q= change in temprature in kelvin^4 *area*e*a
35
hooke's law
law that is created to explain springs
36
F elastic of Hooke's law
Felastic =-k(x-xequal) k is the constant x is the level of explansion or the compression
37
larger k value
this is going to create a sifters spring and there is going to be a greater force exerted force is also the opposite direction of the displacement
38
weight on a spring
-k(change in y)=m(g)
39
energy stored in a spring
1/2k(deta x)^ 2 | the push or the compression doesn't matter becasue it is going to give you the same potential energy
40
mechanical energy
it is the addition of potential energy and the kinetic energy Emech =(1/2mv^2)+(1/2kdelta x^2)
41
what is going to happened with the increase in kinetic energy
it is going to cause an increase in speed
42
when is the PEX going to be the greatest
it is going to be the greatest at the turning points
43
where is the KEmax going to happened
this is going to happen at the equilibrium
44
equation of the turning point
``` Emech= 0+PE Emeh= 0+1/2k(Xfinal-Xinitial)^2 ```
45
Equation of the Equalibrium
Emech=KE+0 Emech =1/2mv^2 it id going to be used to solve for the mac speed
46
equalibrium with gravity
it is going to be a straight line and the KE can't be negative because the v is ^2
47
periodic motion
T
48
relationship with periodic motion and Frequency
F=1/T
49
Simple harmonic motion T
T=2pi sqrt(m/k)
50
simple harmonic motion frequency
f=(1/2pi sqrt(k/m)) | if it is going to create a larger period the frequency is going to be lower
51
x(t)=Xcos(2pi t/T)
X is the amplitude, T is the period,t is the time, and alpha is the position
52
velocity v(t)
v(t)-vmax sin(2pi (t)/T)
53
acceleration x(t)
(-kX/m)cos(2pit/T)
54
Simple Pendulum
it is going to be a perfect porabola | F=m(g)(a)
55
T for the simple pendulum
mg(cos theda)=T
56
acceleration of a single pendulum
-gsin(0)
57
Period of the pendulum given the length
T=2pi sqrt(L/g)
58
simple harmonic oscilator
k=m(g)/L
59
mechanical energy of a single ocilator
1/2L^2 (w^2)+1/2(m)(g)(0)^2
60
wmax
sqrt(g/l) 0max
61
Period in Uniform circular motion
T=2pi sqrt(m.k)
62
critical dampining
is going to approch zero,but it doen't cross it
63
over damping
it is going to create a large drag force, but it is going to be slower to reach equalibrium
64
driving force
it is going to cause an input of more energy
65
waves
have the movement through space, the wave is going to move left to right but the particles are going to move up/ down
66
velocity of the wave
Vw= wave length/ time
67
transversive waves
vibration direction is parallel to the direction of the motion
68
longtitual waves
th vibraton is the same direction as the motion
69
super position
adding of the waves
70
constructive waves
the period and amplitudes are the same and they have the same synch which means that it is going to be added
71
deconstructive wave
the waves are going to cancel each other out, it s out of synch, but it has the period and amplitude
72
beats
absolute value of f1-f2
73
frquency
f=Vw/ wave length
74
sound
known as vibrations
75
transverse Sound
this is going to be the sound that is going to be perpendicular to the sound
76
medium
material that the wave is going through
77
speed of sound
depends on the material and the temperature
78
temperature's affect on sound
Vw=(medium) squat(T/273)
79
Is the speed of sound going to change with frequency
the speed of sound is goin to be the same regardless of the frequency
80
long wavelengths
low frequencies
81
short wavelengths
high frequencies
82
Intensity
P/A | power is going to be the Energy / time
83
Quiet Sound VS loud sound
small amplitude vs large amplitude
84
Sound intensity level
10log10(I/I initial)db
85
Doppler effect
It is going to calculate the frequency changes
86
what is going to happen when the source is moving away from the observer?
it is going to cause the pitch to decrease
87
bunched waves vs streatched waves
bunched waves are going to cause the pitch to be greater while the stretched waves is going to cause the pitch to be higher
88
stationary observer and the moving source
Fobs =Fs(Vw/Vw+Vsrc) it is going to be + is it is moving away from you and it is going to be - is it is moving toward you
89
stationary source and a moving observer
f obser=(fsrc(Vw+- Vobs/Vw) | observer moving away the source is going to (-) and the observer moving towards the source is going to be (+)
90
what is the pitch that the engineer of the train is going to hear?
the engineer is going to hear a sound that is the same as the pitch of the horn
91
source moving above or at the speed of sound
it is going to overlap and create a shockwave at the speed of light. If it is above the speed of sound, it is going to make a cone shape and produce sonic boom which can create physical problems.

Introduction to Physics (2 decks)

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