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Introduction to Physics > Physics exam 3 > Flashcards

Physics exam 3 Flashcards

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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
Q

triple point

A

it is going to be a point where it is going to be a solid, liquid, and gas

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26
Q

heat

A

thermal energy change from one object to another

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27
Q

Equation for heat

A 
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
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28
Q

what is the equation of heat when there is a phase change?

A

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

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29
Q

calometer

A

heat transfer b/w the two systems

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30
Q

final temperature with a calometer

A

T=(MwCwTw)+(MlClTl)/(MwCw+mlCl)

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31
Q

phase changes

A

McDeltal +mL=McCl delta t

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32
Q

conduction

A

(ka/l)(delta t)

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33
Q

convection

A

transfer of heat from one phase to another

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34
Q

radiation

A

heat is transfered from one form to light

Q= change in temprature in kelvin^4 areae*a

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35
Q

hooke’s law

A

law that is created to explain springs

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36
Q

F elastic of Hooke’s law

A

Felastic =-k(x-xequal)
k is the constant
x is the level of explansion or the compression

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37
Q

larger k value

A

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
Q

weight on a spring

A

-k(change in y)=m(g)

39
Q

energy stored in a spring

A

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
Q

mechanical energy

A

it is the addition of potential energy and the kinetic energy
Emech =(1/2mv^2)+(1/2kdelta x^2)

41
Q

what is going to happened with the increase in kinetic energy

A

it is going to cause an increase in speed

42
Q

when is the PEX going to be the greatest

A

it is going to be the greatest at the turning points

43
Q

where is the KEmax going to happened

A

this is going to happen at the equilibrium

44
Q

equation of the turning point

A 
Emech= 0+PE
Emeh= 0+1/2k(Xfinal-Xinitial)^2
45
Q

Equation of the Equalibrium

A

Emech=KE+0
Emech =1/2mv^2
it id going to be used to solve for the mac speed

46
Q

equalibrium with gravity

A

it is going to be a straight line and the KE can’t be negative because the v is ^2

47
Q

periodic motion

A

T

48
Q

relationship with periodic motion and Frequency

A

F=1/T

49
Q

Simple harmonic motion T

A

T=2pi sqrt(m/k)

50
Q

simple harmonic motion frequency

A

f=(1/2pi sqrt(k/m))

if it is going to create a larger period the frequency is going to be lower

51
Q

x(t)=Xcos(2pi t/T)

A

X is the amplitude, T is the period,t is the time, and alpha is the position

52
Q

velocity v(t)

A

v(t)-vmax sin(2pi (t)/T)

53
Q

acceleration x(t)

A

(-kX/m)cos(2pit/T)

54
Q

Simple Pendulum

A

it is going to be a perfect porabola

F=m(g)(a)

55
Q

T for the simple pendulum

A

mg(cos theda)=T

56
Q

acceleration of a single pendulum

A

-gsin(0)

57
Q

Period of the pendulum given the length

A

T=2pi sqrt(L/g)

58
Q

simple harmonic oscilator

A

k=m(g)/L

59
Q

mechanical energy of a single ocilator

A

1/2L^2 (w^2)+1/2(m)(g)(0)^2

60
Q

wmax

A

sqrt(g/l) 0max

61
Q

Period in Uniform circular motion

A

T=2pi sqrt(m.k)

62
Q

critical dampining

A

is going to approch zero,but it doen’t cross it

63
Q

over damping

A

it is going to create a large drag force, but it is going to be slower to reach equalibrium

64
Q

driving force

A

it is going to cause an input of more energy

65
Q

waves

A

have the movement through space, the wave is going to move left to right but the particles are going to move up/ down

66
Q

velocity of the wave

A

Vw= wave length/ time

67
Q

transversive waves

A

vibration direction is parallel to the direction of the motion

68
Q

longtitual waves

A

th vibraton is the same direction as the motion

69
Q

super position

A

adding of the waves

70
Q

constructive waves

A

the period and amplitudes are the same and they have the same synch which means that it is going to be added

71
Q

deconstructive wave

A

the waves are going to cancel each other out, it s out of synch, but it has the period and amplitude

72
Q

beats

A

absolute value of f1-f2

73
Q

frquency

A

f=Vw/ wave length

74
Q

sound

A

known as vibrations

75
Q

transverse Sound

A

this is going to be the sound that is going to be perpendicular to the sound

76
Q

medium

A

material that the wave is going through

77
Q

speed of sound

A

depends on the material and the temperature

78
Q

temperature’s affect on sound

A

Vw=(medium) squat(T/273)

79
Q

Is the speed of sound going to change with frequency

A

the speed of sound is goin to be the same regardless of the frequency

80
Q

long wavelengths

A

low frequencies

81
Q

short wavelengths

A

high frequencies

82
Q

Intensity

A

P/A

power is going to be the Energy / time

83
Q

Quiet Sound VS loud sound

A

small amplitude vs large amplitude

84
Q

Sound intensity level

A

10log10(I/I initial)db

85
Q

Doppler effect

A

It is going to calculate the frequency changes

86
Q

what is going to happen when the source is moving away from the observer?

A

it is going to cause the pitch to decrease

87
Q

bunched waves vs streatched waves

A

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
Q

stationary observer and the moving source

A

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
Q

stationary source and a moving observer

A

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
Q

what is the pitch that the engineer of the train is going to hear?

A

the engineer is going to hear a sound that is the same as the pitch of the horn

91
Q

source moving above or at the speed of sound

A

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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