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Applied Physics with Lab – 61038, Fall 2023
INSTRUCTOR
Module 5: Charge and Electric Field
(Homework)
Cengage
Access
Devry University,
IL
Current Score
QUESTION
1
2
3
4
5
6
7
8
POINTS
6.66/10
3.5/7
0/6
–/6
–/10
–/6
–/9
–/6
Due Date
TUE, DEC 19, 2023
1:59 AM EST
Request Extension
TOTAL SCORE
10.16/60 16.9%
Assignment Submission & Scoring
Assignment Submission
For this assignment, you submit answers by questions. You are required to use a new randomization after
every 1 question submissions.
Assignment Scoring
Your best submission for each question part is used for your score.
1.
[6.66/10 Points]
DETAILS
PREVIOUS ANSWERS
SERCP11 15.IVV.001.
5/5 Submissions Used
MY NOTES
ASK YOUR TEACHER
Watch the video vignette below, and be sure to follow any instructions when prompted during the videos. Then answer the questions
below about the concepts discussed in the video.
Electric Charge
Interactive Video Vignette
Electric
Charge
Enter your name here
Your name
and then click Next at the
bottom right corner of this
window to continue.
PREV
1
2
3
4
5
6
NEXT
In the video, the students create two charged tapes, a “pointy” tape and a “square” tape. The pointy tape is first placed on top of the
square tape, and the two are pulled apart. After pulling them apart, the students observed the behavior of the tapes when they were
brought near each other, but not touching each other.
(a)
How did the pointy tapes behave when brought near each other, and what does this demonstrate about their charges?
Two pointy tapes repel. This shows they have opposite types of charge.
Two pointy tapes attract. This shows they have opposite types of charge.
Two pointy tapes repel. This shows they have the same type of charge.
Two pointy tapes attract. This shows they have the same type of charge.
(b)
How did the square tapes behave when brought near each other, and what does this demonstrate about their charges?
Two square tapes repel. This shows they have opposite types of charge.
Two square tapes attract. This shows they have opposite types of charge.
Two square tapes repel. This shows they have the same type of charge.
Two square tapes attract. This shows they have the same type of charge.
(c)
How did a square tape and a pointy tape behave when brought near each other, and what does this demonstrate about their
charges?
A square tape and a pointy tape repel. Given that they are both charged, this shows they have opposite types of
charge.
A square tape and a pointy tape attract. Given that they are both charged, this shows they have opposite types of
charge.
A square tape and a point tape repel. Given that they are both charged, this shows they have the same type of charge.
A square tape and a point tape attract. Given that they are both charged, this shows they have the same type of
charge.
Solution or Explanation
The two tapes were prepared in such a way that the square tape and pointy tape had opposite signs of charge. Like signed charges
repel and opposite signed charges attract. The fact that two square tapes repel show they have the same sign of charge, and the same
is true for two pointy tapes. The square and pointy tapes are attracted to each other because their charges have opposite sign. Note,
however, that attraction is not always sufficient evidence to show both objects have a net charge. Charged objects can attract neutral
objects due to polarization effects in the neutral object.
2.
[3.5/7 Points]
DETAILS
PREVIOUS ANSWERS
SERCP11 15.2.OP.001.
1/5 Submissions Used
MY NOTES
ASK YOUR TEACHER
Two charged particles are a distance of 1.92 m from each other. One of the particles has a charge of 7.31 nC, and the other has a
charge of 4.02 nC.
(a)
What is the magnitude (in N) of the electric force that one particle exerts on the other?
N
(b)
Is the force attractive or repulsive?
attractive
repulsive
3.
[0/6 Points]
DETAILS
PREVIOUS ANSWERS
MY NOTES
ASK YOUR TEACHER
Two uncharged spheres are separated by 2.10 m. If 4.40 ✕ 10
12
SERCP11 15.2.P.007. 1/5 Submissions Used
electrons are removed from one sphere and placed on the other,
determine the magnitude of the Coulomb force (in N) on one of the spheres, treating the spheres as point charges.
H I NT
N
4.
[–/6 Points]
DETAILS
SERCP11 15.3.OP.020. 0/5 Submissions Used
MY NOTES
ASK YOUR TEACHER
Inside a vacuum tube, an electron is in the presence of a uniform electric field with a magnitude of 280 N/C.
(a)
2
What is the magnitude of the acceleration of the electron (in m/s )?
m/s
(b)
2
The electron is initially at rest. What is its speed (in m/s) after 1.15 ✕ 10
−8
s?
m/s
5.
[–/10 Points]
MY NOTES
DETAILS
SERCP11 15.3.P.018. 0/5 Submissions Used
ASK YOUR TEACHER
(a) Determine the electric field strength at a point 1.00 cm to the left of the middle charge shown in the figure below. (Enter the
magnitude of the electric field only.)
ℹ
N/C
(b) If a charge of −6.58 µC is placed at this point, what are the magnitude and direction of the force on it?
N
magnitude
direction
—Select—
6.
[–/6 Points]
DETAILS
SERCP11 15.3.P.019. 0/5 Submissions Used
MY NOTES
ASK YOUR TEACHER
5
An electric field of magnitude 5.25 ✕ 10 N/C points due east at a certain location. Find the magnitude and direction of the force on
a−2.85 C charge at this location.
magnitude
direction
N
—Select—
7.
[–/9 Points]
DETAILS
SERCP11 16.1.OP.006. 0/5 Submissions Used
MY NOTES
ASK YOUR TEACHER
The figure below shows a small, charged bead, with a charge of q = +41.0 nC, that moves a distance of d = 0.193 m from point A to
point B in the presence of a uniform electric field E of magnitude 280 N/C, pointing right.
ℹ
(a)
What is the magnitude (in N) and direction of the electric force on the bead?
magnitude
direction
(b)
N
—Select—
What is the work (in J) done on the bead by the electric force as it moves from A to B?
J
(c)
What is the change of the electric potential energy (in J) as the bead moves from A to B? (The system consists of the bead and
all its surroundings.)
PE − PE =
B
(d)
J
A
What is the potential difference (in V) between A and B?
V −V =
B
A
V
8.
[–/6 Points]
DETAILS
SERCP11 16.1.P.004. 0/5 Submissions Used
MY NOTES
ASK YOUR TEACHER
Cathode ray tubes (CRTs) used in old-style televisions have been replaced by modern LCD and LED screens. Part of the CRT included a
set of accelerating plates separated by a distance of about 1.66 cm. If the potential difference across the plates was 30.0 kV, find the
magnitude of the electric field (in V/m) in the region between the plates.
H I NT
V/m
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Applied Physics with Lab – 61038, Fall 2023
INSTRUCTOR
Module 7: Waves (Homework)
Cengage Access
Devry University, IL
Current Score
QUESTION
1
2
3
4
5
6
7
8
POINTS
–/7
–/7
–/7
–/8
–/8
–/8
–/7
–/8
TOTAL SCORE
–/60
0.0%
Due Date
TUE, DEC 19, 2023
1:59 AM EST
Request Extension
Assignment Submission & Scoring
Assignment Submission
For this assignment, you submit answers by questions. You are required to use a new randomization
after every 1 question submissions.
Assignment Scoring
Your best submission for each question part is used for your score.
1.
[–/7 Points]
DETAILS
SERCP11 13.8.OP.041. 0/5 Submissions Used
MY NOTES
ASK YOUR TEACHER
This figure shows a sinusoidal wave that is traveling from left to right, in the +x-direction. Assume that it is described by a
frequency of 11.7 cycles per second, or hertz (Hz).
6.57 cm
4.10 cm
(a)
What is the wave’s amplitude (in cm)?
cm
(b)
What is the wavelength (in cm)?
cm
(c)
Calculate the wave’s period (in s).
s
(d)
Compute the speed of this wave (in m/s).
m/s
ℹ
2.
[–/7 Points]
DETAILS
SERCP11 14.3.P.003. 0/5 Submissions Used
MY NOTES
ASK YOUR TEACHER
On a hot summer day, the temperature of air in Arizona reaches 119°F. What is the speed of sound in air at this
temperature? (The speed of sound at 0°C is 331 m/s. Use the conversion 0°C = 273 K as necessary.)
m/s
3.
[–/7 Points]
DETAILS
SERCP11 14.3.P.005. 0/5 Submissions Used
MY NOTES
ASK YOUR TEACHER
A group of hikers hears an echo 3.80 s after shouting. How far away is the mountain that reflected the sound wave?
(Assume the speed of sound is 344 m/s.)
m
4.
[–/8 Points]
DETAILS
MY NOTES
ASK YOUR TEACHER
Find the sound level in dB of 6.97
dB
WACOLPHYSAV1 12.P.060. 0/5 Submissions Used
10 -2 W/m 2 ultrasound used in medical diagnostics.
5.
[–/8 Points]
DETAILS
SERCP11 22.3.OP.012. 0/5 Submissions Used
MY NOTES
ASK YOUR TEACHER
Using filters, a technician has created a beam of light consisting of three wavelengths: 400 nm (violet), 500 nm (green), and
650 nm (red). She aims the beam so that it passes through air and then enters a block of crown glass. The beam enters the
glass at an incidence angle of = 40.7°.
1
The glass block has the following indices of refraction for the respective wavelengths in the light beam.
wavelength (nm)
index of refraction
(a)
400
n
400 nm
= 1.53
500
n
500 nm
= 1.52
650
n
650 nm
= 1.51
Upon entering the glass, are all three wavelengths refracted equally, or is one bent more than the others?
400 nm light is bent the most
500 nm light is bent the most
650 nm light is bent the most
all colors are refracted alike
(b)
What are the respective angles of refraction (in degrees) for the three wavelengths? (Enter each value to at least two
decimal places.)
(i)
400 nm
°
(ii)
500 nm
°
(iii)
650 nm
°
6.
[–/8 Points]
DETAILS
SERCP11 22.3.OP.013. 0/5 Submissions Used
MY NOTES
ASK YOUR TEACHER
A light ray is incident on the surface of a block of flint glass at an angle of 42.0° with respect to the normal (a line
perpendicular to the surface at the spot where the ray hits the block).
A fraction of the light is reflected and the rest refracted. What is the angle (in degrees) between the reflected and refracted
rays?
°
7.
[–/7 Points]
DETAILS
MY NOTES
ASK YOUR TEACHER
Find the speed of light in the following.
(a) sodium chloride
m/s
(b) diamond
m/s
(c) ethyl alcohol
m/s
SERCP11 22.3.P.006. 0/5 Submissions Used
8.
[–/8 Points]
DETAILS
SERCP11 21.12.P.063. 0/5 Submissions Used
MY NOTES
ASK YOUR TEACHER
The rainbow of visible colors in the electromagnetic spectrum varies continuously from the longest wavelengths (the
reddest colors) to the shortest wavelengths (the deepest violet colors) our eyes can detect. Wavelengths near 655 nm are
perceived as red. Those near 515 nm are green and those near 475 nm are blue. Calculate the frequency of light (in Hz) with
a wavelength of 655 nm, 515 nm, and 475 nm.
H I NT
(a)
655 nm
Hz
(b)
515 nm
Hz
(c)
475 nm
Hz
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