PHY309 L.
Solutions for Midterm Test # 2.
Problem #1:
(a) In general, a traveling wave has form
y (x, t) = f (x ut)
(1)
where f is a function of a single variable: f (x) gives the shape of the wave pulse at time
t = 0. Shifting the argument x x ut makes t
PHY309L
Homework 1
January 17, 2012
Multiple choice. Five points each.
(1) In an electrically neutral atom the number of protons in the nucleus is equal to the number of (A) electrons
that surround the nucleus. (B) neutrons in the nucleus. (C) both of the
PHY309 L:
Mid-term Test #2
October 26, 2010
Solve any four problems out of ve:
1. A wave on a string is described by the following equation:
y (x, t) = 0.01 sin 2 (900 t 3 x)
(1)
where x and y are in meters and t is in seconds.
(a) Is this a traveling wav
PHY309 L.
Solutions for Midterm Test # 2.
Problem #1:
(a) In general, a traveling wave has form
y (x, t) = f (x ut)
(1)
where f is a function of a single variable: f (x) gives the shape of the wave pulse at time
t = 0. Shifting the argument x x ut makes t
HW7
#1.
c 3 108 m / s
500m
f 600 103 Hz
c 3 108 m / s
f
3.0 1018 Hz
10
10 m
#2.
#3. d 0.4mm, 500nm, x 2.0m
d
#4.
y
x (500 109 m) 2.0m
y
2.5 103 m
x
d
0.4 103 m
nx
, for n 0,1,2,.
d
these integers(n) are called the order number, (central line with n=
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001 (part 1 of 2) 10.0 points
Consider two vectors F1 with magnitude 81 N
#E2
HW5
7
F 2k I 1 I 2 2 (1 10 N / A ) 4 A 4 A
=
=
= 3.2 10 5 N / m
l
r
0.1m
'
2
#E3Magneticforceisinverselyproportionaltothedistancerbetweenthetwowires.
Distanceistripled>Forceisonethird.
#E5 q = I t = 4 A 5s = 20C
#E6 F = qvB = 0.06C 600m / s 0.5T = 18
PHY309 L:
Mid-term Test #1
September 28, 2010
Solve any four problems out of ve:
1. Consider two beads on a vertical string: The top bead can slide up
or down the string without friction, but the bottom bead is xed
(the string is tied to it). The two bead
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001 10.0 points
From the electric eld vector at one point, one
can determ
PHY309 L.
Solutions for homework set # 10.
Non-textbook problem #II from the previous homework set:
(a) Lets start with the isotope naming conventions. A complete name of an isotope has
form
A
E,
Z
for example
16
1
H,
1
O,
35
Cl,
17
63
Cu, . . .
29
(1)
He
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1
in an innite well that is 2.1 cm wide.
For what value of n will the el
Forces between magnetic poles
1
qm1 qm2
F=
4
r2
0 = 4 10
7
Tm
A
3
Solar wind
Aurora
Analogy with electric dipole
4
5
Oersteds experiment
Fig. 14.11
Fig. 14.10
11
0 I
B=
2r
12
F
0 I1 I2
=2
l
4r
13
Force for charge
in motion
Fig. 14.13
14
F =q
B
Lorentz Fo
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001 (part 1 of 2) 10.0 points
Consider two vectors F1 with magnitude 81 N
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001 10.0 points
In a particular television tube, a beam of
electrons has
Version 088 Exam 1 schler (56630)
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001 10.0 points
An electron remains suspended between the
surface of the Earth (as
Useful Information for HW2
Useful Constants
Often, the problems themselves give you the values of necessary constants. If some of
the values are NOT given in a problem, you can use the following values. Coloumb
Constant (ke ):
ke = 8.98755 109 N m2 /C 2
(
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001 10.0 points
Penny wishes to take a picture of her image in
a plane mi
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001
Within what period of time must the eld
be reduced to zero if the ave
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001 10.0 points
What would equal 5 meters?
1
Both car A and car B lea
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001 (part 1 of 2) 10.0 points
Shiny lawn spheres placed on pedestals ar
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1
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001 (part 1 of 2) 10.0 points
What is the fundamental frequency of a
0.
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001 (part 1 of 2) 10.0 points
Shiny lawn spheres placed on pedestals are
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001 10.0 points
In a particular television tube, a beam of
electrons ha
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001 10.0 points
Suppose a sound wave and an electromagnetic
wave have the
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001 10.0 points
A satellite moves in a circular orbit around
the Eart
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qm
vB
qv
10. r =
mB
001 (part 1 of 3) 10.0 points
Consider the circular
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001 10.0 points
A force of 2910 N is needed to bring a car
moving at
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001 10.0 points
Two objects of different mass slide down two
differen
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001 10.0 points
Four point charges, each of magnitude
4.63 C, are placed