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2054
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Physics
Date
Apr 3, 2024
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9
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Exam #77777
Exam #77777
Directions
1. Print your name on this question sheet and sign it.
2. Code your 5-digit exam code (at the top of this question sheet) on your Scantron in columns 76–80.
3. Code your name and 8-digit UFID on the Scantron.
Darken all circles completely on the Scantron
using a #2
pencil or
dark blue
or
black
ink. Do not make any stray marks or the Scantron may not read properly.
4. Do all scratch work anywhere on this question sheet that you like. At the end of the exam, the question sheet and
Scantron are both to be turned in.
No credit will be given without both Scantron sheet and question sheet.
5. The answers are rounded, so choose the closest to exact. There is no penalty for guessing.
1.
Which of the following statements, regarding the exam directions on the first page, is true?
I. The exam code shown at the top corner of the exam page must be bubbled in lines 76-80
II. According to direction 9, you are allowed to take home both the exam questions and scratch paper
III. Students are required to print and sign their names at the top of the exam’s front page
(1) I only
(2) II only
(3) I and II only
(4) I and III only
(5) I, II, and III
2.
A system consists of a positive charge +
q
released from rest near a fixed positive charge +
Q
.
The two charges are
isolated from their surroundings. Which statements are correct about the motion of the released charge while there is some
separation between them?
I. It accelerates in the direction opposite to the electric field.
II. The magnitude of the acceleration is decreasing.
III. Its speed will continually increase.
(1) I only
(2) II only
(3) I and III only
(4) III only
(5) II and III only.
3.
A system consists of a negative charge
-
q
released from rest near a fixed positive charge +
Q
.
The two charges are
isolated from their surroundings. Which statements are correct about the motion of the released charge while there is some
separation between them?
I. It accelerates in the direction opposite to the electric field.
II. The magnitude of the acceleration is decreasing.
III. Its speed will continually increase.
(1) I only
(2) II only
(3) I and III only
(4) III only
(5) I, II, and III.
4.
A small plastic sphere is charged to +2
.
0 nC. It is held 3.00 cm directly above a small glass bead at rest on a table. The
bead has a mass of 15.0 mg and a charge of +3
.
0 nC. What is the magnitude of the normal force acting on the glass bead
by the table?
(1) 150
μ
N
(2) 90
μ
N
(3) 60
μ
N
(4) 120
μ
N
(5) 210
μ
N
5.
A small plastic sphere is charged to
-
3
.
0 nC. It is held 3.00 cm directly above a small glass bead at rest on a table. The
bead has a mass of 15.0 mg and a charge of +2
.
0 nC. What is the magnitude of the normal force acting on the glass bead
by the table?
(1) 150
μ
N
(2) 90
μ
N
(3) 60
μ
N
(4) 120
μ
N
(5) 210
μ
N
6.
It is observed that the electric field at the origin is 0. Which statement could be true based on this information?
I. There are no charges in the proximity of the origin
II. There is an equal amount of positive and negative charges above/below the x-axis, respectively
III. There is a net positive charge along the x-axis
(1) I only
(2) II only
(3) I and II only
(4) I and III only
(5) I, II, and III
Exam #77777
Exam #77777
7.
Four tiny charged particles (two having a charge +
Q
and two having a charge
-
Q
) are fixed
in place at locations on the
xy
plane as shown. Each charge is equidistant from the origin. In
which direction is the net electric field at the point
P
? Upwards means along the +
y
direction
and downwards means along the
-
y
direction.
(1) directly upwards
(2) to the left
(3) upwards and towards the left
(4) upwards and towards the right
(5) The net field is zero, so there is no direction.
8.
Four tiny charged particles (two having a charge +
Q
and two having a charge
-
Q
) are fixed
in place at locations on the
xy
plane as shown. Each charge is equidistant from the origin. In
which direction is the net electric field at the point
P
? Upwards means along the +
y
direction
and downwards means along the
-
y
direction.
(1) directly upwards
(2) to the right
(3) upwards and towards the left
(4) upwards and towards the right
(5) The net field is zero, so there is no direction.
9.
Two parallel plate capacitors with an area of
A
1
= 0
.
1 cm
2
,
A
2
=
0
.
05 cm
2
and charges
q
1
=
q
2
= 2
.
0 pC . Both have an electrode separation
of
d
= 0
.
02 mm.
If the capacitors are brought into contact with each
other to form a single capacitor (as shown in the figure), what is the final
magnitude of the electric field between the plates?
+
+
+
+
+ + + +
-
-
-
-
- - - -
(1) 3
.
0
×
10
4
V/m
(2) 1
.
5
×
10
4
V/m
(3) 2
.
3
×
10
4
V/m
(4)
q
1
ε
0
A
1
+
q
2
ε
0
A
2
(5) All other choices are incorrect.
10.
Two parallel plate capacitors with an area of
A
1
= 0
.
1 cm
2
,
A
2
=
0
.
05 cm
2
and charges
q
1
=
q
2
= 4
.
0 pC . Both have an electrode separation
of
d
= 0
.
02 mm.
If the capacitors are brought into contact with each
other to form a single capacitor (as shown in the figure), what is the final
magnitude of the electric field between the plates?
+
+
+
+
+ + + +
-
-
-
-
- - - -
(1) 6
.
0
×
10
4
V/m
(2) 3
.
0
×
10
4
V/m
(3) 4
.
5
×
10
4
V/m
(4)
q
1
ε
0
A
1
+
q
2
ε
0
A
2
(5) All other choices are incorrect.
11.
A charge
Q
starts at point A and is moved along the dashed path to points B, C,
and finally arriving at D, in the presence of a uniform electric field of magnitude 500
V/m and direction as shown in the figure. What is the change in potential that the
charge undergoes?
(1) 0 V
(2) +9 V
(3)
-
16 V
(4) +20 V
(5) Depends on the sign of Q
E
A
B
C
D
1 cm
Exam #77777
Exam #77777
12.
A charge
Q
starts at point A and is moved along the dashed path to points B, C,
and finally arriving at D, in the presence of a uniform electric field of magnitude 500
V/m and direction as shown in the figure. What is the change in potential that the
charge undergoes?
(1) 0 V
(2)
-
9 V
(3) +16 V
(4)
-
20 V
(5) Depends on the sign of Q
E
A
B
C
D
1 cm
13.
The
V
vs
y
graph shows the values of electric potential in a region of space where the
electric field points in the +
y
direction or
-
y
direction and no other orientations are observed.
Based on the graph, at which labeled location(s) along the
y
-axis is the magnitude of the
electric field the the smallest?
(1) M only
(2) M and O only
(3) N only
(4) O only
(5) All other choices are incorrect.
+V
–V
y
M
N
O
14.
The
V
vs
y
graph shows the values of electric potential in a region of space where the
electric field points in the +
y
direction or
-
y
direction and no other orientations are observed.
Based on the graph, at which labeled location(s) along the
y
-axis is the magnitude of the
electric field the largest?
(1) M only
(2) M and O only
(3) N only
(4) M, N, and O
(5) All other choices are incorrect.
+V
–V
y
M
N
O
15.
A negative charge, with unknown magnitude
Q
and
M
= 2
.
5
×
10
-
20
kg, is placed halfway between two positive charges (with
q
A
= +7 nC,
q
B
= +12 nC, and
m
A
=
m
B
= 5
.
5
×
10
-
18
kg separated by a distance
2
d
= 10 cm as shown in the figure. The negative charge is then moved to
a final location a distance
d
to the right of the positive charge A. The net
change in the potential energy of the system is
x
q
A
q
B
Q
d
d
(1) Positive
(2) Negative
(3) Zero
(4) Depends on the magnitude of Q
(5) Cannot be determined
Exam #77777
Exam #77777
16.
A negative charge, with unknown magnitude
Q
and
M
= 5
.
0
×
10
-
20
kg, is placed halfway between two positive charges (with
q
A
=
+12 nC,
q
B
= +7 nC, and
m
A
=
m
B
= 15
.
5
×
10
-
18
kg separated by a
distance 2
d
= 10 cm as shown in the figure. The negative charge is then
moved to a final location a distance
d
to the right of the positive charge
A. The net change in the potential energy of the system is
x
q
A
q
B
Q
d
d
(1) Positive
(2) Negative
(3) Zero
(4) Depends on the magnitude of Q
(5) Cannot be determined
17.
The RHIC at Brookhaven National Laboratory can accelerate and collide heavy nuclei such as gold to study the
underlying physics of subatomic particles. If two fully ionized gold nuclei (where the element number
Z
of gold is
Z
= 79),
with a mass of 3
.
3
×
10
-
25
kg and whose radii are 4
.
1 fm are moving towards each other with a speed of 2
.
0
×
10
7
m/s each,
will they collide, or if not what is the distance of closest approach that they will reach?
(1) 11 fm
(2) 22 fm
(3) 870 fm
(4) The nuclei will collide.
(5) All other choices are incorrect.
18.
The RHIC at Brookhaven National Laboratory can accelerate and collide heavy nuclei such as iron to study the
underlying physics of subatomic particles. If two fully ionized iron nuclei (where the element number
Z
of iron is
Z
= 26),
with a mass of 9
.
3
×
10
-
26
kg and whose radii are 1
.
9 fm are moving towards each other with a speed of 2
.
0
×
10
7
m/s each,
will they collide, or if not what is the distance of closest approach that they will reach?
(1) 4.2 fm
(2) 8.4 fm
(3) 110 fm
(4) The nuclei will collide.
(5) All other choices are incorrect.
19.
The RHIC at Brookhaven National Laboratory can accelerate and collide heavy nuclei such as oxygen to study the
underlying physics of subatomic particles.
If two fully ionized oxygen nuclei (where the element number
Z
of oxygen
is
Z
= 8), with a mass of 2
.
7
×
10
-
26
kg and whose radii are 0
.
51 fm are moving towards each other with a speed of
2
.
0
×
10
7
m/s each, will they collide, or if not what is the distance of closest approach that they will reach?
(1) 1.4 fm
(2) 2.8 fm
(3) 11 fm
(4) The nuclei will collide.
(5) All other choices are incorrect.
20.
Each plate of a capacitor remains connected to a 9V battery with ideal wires while its plates are pulled further apart.
Which of the following are true of the process?
I. The electric field between the plates decreases.
II. The energy stored in the capacitor remains the same.
III. Charge on the plates increases.
(1) I and II only
(2) I and III only
(3) II only
(4) II and III only
(5) All other choices are incorrect.
21.
Each plate of a capacitor remains connected to the terminals of a 9V battery with ideal wires while its plates are pushed
closer together. Which of the following are true of the process?
I. The electric field between the plates decreases.
II. The energy stored in the capacitor remains the same.
III. Charge on the plates increases.
(1) I only
(2) I and III only
(3) II only
(4) II and III only
(5) All other choices are incorrect.
22.
A stream of charged Styrofoam beads, with mass
m
= 0
.
1 g and charge
q
= 2
.
0 pC each, are flowing through a pipe at
a speed of
v
= 0
.
1 mm/s. There are 1000 beads/cm
3
throughout the pipe, which has a circular cross-sectional with radius
r
= 1 cm, and length
L
= 50 cm. There is a uniform electric field with magnitude
|
E
|
= 2 N/C within the pipe. What is
the resistance of the pipe?
(1) 1
.
6
×
10
10
Ω
(2) 3
.
2
×
10
8
Ω
(3) 0 Ω
(4)
E
qnπr
2
vL
(5)
E
qnrv
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google.com/document/d/12ne1vOuLQkaSaZESnydjJzbINZIY8_aeCiHDShw9Gv0/edit
NOW DAY 89
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Comic San.
12
I U
A
三
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How else might you express this number? (Millions, billions, etc. ?)
b. A car on the highway drives at 55 mph = 25 meters per second. How long would it take to drive to
the Sun? (Assuming you have a car that works in outer space.)
Use the equation distance = velocity x time, or time = distance / velocity.
Time = distance/velocity = ,
seconds (don't forget to use scientific notation.)
How many days?.
_days
How many years?.
years
Does the answer surprise you?
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please give me a clear answer written with computer
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Challenges to Space Exploration a) We can round numbers to say light (and all electromagnetic radiation: radio waves, infrared, ultraviolet, etc.) travels at approximately 3x108 m/s. At its closest approach, Mars is about 0.5 au of the Earth. At this distance, how long would it take for an astronaut on Mars to communicate with Mission Control on Earth? Give your answer in minutes. Explain why Mars rovers have entire sequences for travel pre-programmed and uploaded all at once rather than being driven around in real time with a joystick.
For the Earth-Moon distance in 5b, you can use 384,400 km b) The boosters that launched Apollo 11 allowed the astronauts to reach a speed of 25,000 miles per hour. At that speed, about how long did it take for the astronauts to reach the Moon? At that speed, how long would it take to reach Mars, assuming the closest approach distance given above? Give your answers in days.
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Table of Contents > Module 13: Wave Optics I > MP HW 12
MP HW 12
-
(MP HW 12 (Spring 2021)
Problem 33.17 - Enhanced - with Feedback
8 of 11
I Review | Constants
Light of 550 nm wavelength illuminates a single slit of
width 0.10 mm. (Figure 1) shows the intensity pattern
seen on a screen behind the slit.
Part A
You may want to review (Pages 941 - 943).
What is the distance to the screen?
Express your answer to two significant figures and include the appropriate units.
Figure
1 of 1
HẢ
L =
Value
Units
ENG
9:36 PM
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