Running head: SOCIOLOGY
1
Sociology
Name
Institutional Affiliation
SOCIOLOGY
2
Sociology
1. Discussing whether Global economic inequality has personal relevance
I concur with the fact that global econ
Topic 5 Study Guide
Listed below are some of the key concepts for this week. Understanding these concepts will be
crucial to understanding the course material. However, this not a comprehensive or exh
Developmental Psychology
Name Adam Negash
Topic 1, Chapters 1 & 2: Introduction and Biological Beginnings
Chapter 1: Critical-Thinking Multiple-Choice Questions
Please answer the following using the s
Surname:
Instructor:
Course:
Date:
Sociology
1. Role of religion for most Americans today
In the United States, religion is marketed by diversity in the religious beliefs and practices.
Despite a larg
Running head: SOCIOLOGY
1
Sociology
Name
Institutional affiliation
Response question one
Research problem
Over the recent past there has been an increase in the consumption of drugs among
teenagers in
Developmental Psychology
Name Adam Negash
Topic 2, Chapters 3 & 4: Physical and Cognitive Development in Infancy & Socioemotional
Development in Infancy
Chapter 3 & 4: Critical-Thinking Multiple-Choic
Topic 7 Key Terms
Listed below are some of the key concepts for this week. Understanding these concepts will be
crucial to understanding the course material. However, this not a comprehensive or exhau
Surname 1
Name:
Instructor:
Course:
Date:
Review of Little Rock Central
Racism has been a widely discussed as a social menace for many decades. African
Americans are perceived as the lot that experien
Two questions:
(1) How to find the force, F on the electric charge, q excreted by the
field E and/or B?
F = qE + qv B
(2) How fields E and/or B can be created?
Maxwells equations
Gausss law for elec
6. Capacitance and capacitors
6.1 Capacitors
+Q
+Q
-Q
+Q
-Q
Symbol:
6.2 Capacitance
Definition:
Q
C=
V
Units:
[C]= 1 F = 1 C / V
V V V+ V
C is independent from: Q and V (V is always proportional to Q)
8. Power in electric circuits
I
R
V
W QV
P
=
= IV
t
t
W = QV
Q
=I
t
V = IR
2
V
P = IV = I R =
R
[ P] = 1W = 1V A = (1J / C ) (1C / s ) = 1J / s
2
Example: Two resistors, R1 = 5 , R2 = 10 , are connect
Resistors in series and in parallel (review)
I
R1
V1
I = I1 = I 2
I1
R2
I
V2
V
I
I2
V = V1 + V2
I = I1 + I 2
Req = R1 + R2
Example
R1
= 12V
R1
R2
E
R2 = 30
12V
I=
=
= 0.26 A
R1 + R1 + r 47
V = V1 = V
III. Magnetism
1. Electromagnetism in the laboratory and around us
2. Electromagnetism is simple. (If you know what it is!)
It is about:
q - electric charges
(magnetic charges do not exist)
F - electr
vd
A
n
N
lA
5. Magnetic forces on current
F = qv B
l
N nlA
lv d = l v d
F = Ftot = Nqvd B
= nlAqvd B
= nqAvd l B
F = Il B
nqAvd = I
- angle between vd and B
dF = Idl B
F = IlB sin
dF = IdlB sin
8. Magnetic field of moving charge
1) What is the problem with moving charge?
2) For v=0 and a=0:
(Coulombs law)
3) For
qr
E=k 2
rr
1
k=
4 0
v=0 and a=0:
(
)
1 v2 c2
( r r v c)
E = kq
( r r v c) 3
Sp
ConcepTest 20.8a Magnetic Field of a Wire I
Magnetic
1) direction 1
If the currents in these wires have
2) direction 2
the same magnitude, but opposite
3) direction 3
directions, what is the direction
Lecture 14 will be presented by Professor Ruslan Prozorov
lecture slides can be found at
http:/course.physastro.iastate.edu/phys222/Lectures%20(Prozorov)/Prozorov_14.pdf
Two questions:
(1) How to find the force, F on the electric charge, q excreted by the
field E and/or B?
F = qE + qv B
(2) How fields E and/or B can be created?
Maxwells equations
Gausss law for elec
13. Comments about the induced electric field
(nonelectrostatic field)
For electrostatic field:
Edl = 0
When a charge goes around
a closed loop work is equal
to zero
W =0
Electrostatic field is conse
e = 1.60 10 19 C ; me = 9.11 10 31 kg
F =k
k=
V1 = V2 = . = V
Q1Q2
r2
1
= 8.99 10 9 N m 2 / C 2
4 0
0 = 8.85 10 12 C 2 / N m 2
Fnet = F1 + F2 + .
F = qE
E net = E1 + E 2 + .
_
E = d E = E cosdA = Ed
7. Spherical mirror
1) Mirror equation
C
do
h
h
h
h
< <1 ; ;
d0
di
R
= +
= +
+ = 2
di
if d i d o R 2 = f
if d o d i R 2 = f
Example:
112
+=
d0 di R
111
+=
d0 di f
R = 1.0m
121
2
1
5. 0
=
=
=
d i
IV. Optics
Nature of light. Spectrum of electromagnetic waves.
Wavelength decreases
Frequency increases
Note: 1 nanometer = 10-9 meter
A. Geometric optics
1. Wave front and rays
rays
wave fronts
2.
7) Energy in electromagnetic waves
Energy density:
dU 1
B2
2
u=
= 0E +
dV 2
2 0
B = E/c
for e.m. wave
for any e.m. field
U B2
u= =
= 0E2
V 0
(U energy, V - volume)
Poynting vector:
Traveling EM waves
ConcepTest 22.2
ConcepTest
The electric field in an EM
wave traveling northeast
oscillates up and down. In
what plane does the
magnetic field oscillate?
Oscillations
Oscillations
1) In the north-south
26. Electromagnetic waves
1) Maxwells equations and electromagnetic waves
2) Properties of electromagnetic waves
Speed of light:
1
c=
3 108 m / s
0 0
c
Wave length: =
f
Polarization of EM waves:
E
E
24. LRC series circuit
1) Impedance
Current i(t) is the same in all
elements of the series circuit.
R
L
v( t )
Note! There is no current inside the capacitor,
but we can apply Kirchhoffs rules taking
22. AC current
1) General ideas
R
2
= 2f =
T
L
C
2) Phasor diagrams
V length of phasor
t
vR ( t ) ?
vC ( t ) ?
vL ( t ) ?
v( t ) = V cos t
V sin t
i( t ) ?
phasor
V cos t
23. AC circuits and reactanc
19. LC circuits
Kirchhoffs loop rule:
C
v = q/C
L
ind
di
d 2q
= L = L 2
dt
dt
vC = ind
q
d 2q
= L 2
C
dt
d 2q
+ 2q = 0
dt 2
Solution:
d 2q
q
+
=0
2
LC
dt
=
1
LC
q = Q cos( t + )
i = Q sin ( t + )