Charges and Fields
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Charges and Fields
1.
Play with the simulation (
Charges and Fields
) and get oriented with all of the different options. This should help you understand the lab better.
Activity 1
2.
From the box at the bottom of the screen, drag a red +1 nC charge into the middle of the screen.
3.
If not already selected: Select ‘Electric Field’. How does the brightness of the arrow relate to the strength of the field? What happens when you check/uncheck ‘Direction only’? Which way do the arrows point for a
positive charge?
a.
All the arrows are pointed away from the charge. When you check the “Direction Only” box, the arrows on the screen become whiter/brighter all over the screen, not in just one general area. When the “Direction Only” box is no longer checked, the arrows on the screen become darker. 4.
Drag the red +1 nC charge back into the box at the bottom, and then drag a blue –1 nC charge onto the screen. Which way do the electric field arrows point for a negative charge?
a.
When you drag the blue -1 nc charge on the screen, we can see all of the arrows are pointing towards the negative charge. 5.
Click on the yellow Sensor at the bottom and drag it across the electric field. What information do the Sensors show?
a.
When you drag the sensors across the electric field, it is sending the direction of the electrical field or the direction of the “arrows” that are displayed on the screen. 6.
What happens to the electric field as you move further from the charges?
a.
As you move the sensor further away from the charge, we can see that the charge decreases. 7.
Take the Voltage meter (labeled ‘0.0 V’). What information does the voltmeter give? What information is given when you click on the pencil (you should have a green circle)? What does the green circle represent? (If you’re not sure, move on and come back to this later.)
a.
When dragging the voltage meter across the screen, it is giving us the information regarding the potential energy value in the electrical field. When you click on the pencil, the green circle is showing the focus of potential energy. Activity 2
(If you want to reset the screen, click on the orange circle arrow in the bottom right corner. Do this before each activity)
8.
How can you make a charge of +2q? How can you make a charge of -3q?
a.
2q – two red positive 1nc charges together
b.
-3q – three blue negative 1nc charges together
9.
Determine what charges (magnitude and positive/negative) would give you the electric field lines shown below?
(You may need to try different combinations to determine the magnitudes of each charge.)
To create this electric field you would need two positive charges (+2nc) and one negative charge (-1nc). 10.
When you have two opposite but equal magnitude charges along a horizontal line (similar to the picture above), where is the electric field the greatest? Is there ever a point where the field will be zero?
a.
The electrical field is the strongest the closer you are to the charges. The farther you are away from the charges reduces the strength of the electrical field decreases. There will never be a point where the field will be zero. 11.
When you have two of the same charges along a horizontal line, where is the electric field the greatest? Is there ever a point where the field will be zero?
a.
Similar to the question above, the electrical field will be strongest near the charges. In this case, there is a point where the field will be zero.
12.
Determine what charge/charges (magnitude and positive/negative) would give each the lines of equipotential shown below?
(For each situation, turn the ‘Electric Field’ on and off to see how the electric field lines compare to the equipotential lines)
a)
a.
+4nc
b)
a.
-5nc
c)
a.
-2nc, +2nc
d)
a.
+3nc
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Related Questions
Capacitance, Charge and Voltage: Q = CV
1. Click the Reset Button on the bottom right of the PHET simulation.
2. CHECK Plate Charges and Bar Graphs boxes in the upper right so your display resembles
the graph below.
3. SET the Plate Area to 200 mm² and the Separation to 4.0 mm.
Capactance
Tup Pate Charge oc
Sured Energy
Pu Charges
r Graphs
O e Fd
Cument Direction
1500 V
4. Connect the voltmeter across the capacitor by placing the red on the top plate and black
on bottom. If the voltmeter reads a negative, switch the red and black.
5. Set the battery Voltage to 0.25 V. Record the measured plate charge, Q.
6. Repeat Step 5 for each Voltage in Table 3.
Table 3: Charge and Voltage
Voltage
|(V)
Plate Charge
|(pC)
0.25 V
0.50 V
0.75 V
1.00 V
1.25 V
1.50 V
arrow_forward
Directions: Answer each of the following items. Write all pertinent solutions including illustrations and box your final answer.
1. One charge of 2C is 1.5meters away from a -3C charge. Determine the force exerted on each other.1. A negative charge of -200 micro coulomb and a positive charge of 800 micro coulomb are separated by a distance of 30 centimeters. What is the force between the two charges?1. How far apart are two charges one of magnitude 3 micro coulomb and the other of magnitude 5 micro coulomb if the force between them is 20 n ?1. A -6 micro coulomb charge exerts an attractive force of 65N on a second charge that is 5cm away.What is the magnitude of the second charge?
arrow_forward
The diagram below illustrates an experiment with electrons. A beam of electrons iscreated using an electron gun, and deflected using an electric field.
i.Explain how the electron gun creates a beam of electrons. Add to the diagramif that will help your explanation.ii.The electric field which deflects the beam is created by applying a potentialdifference of 2500 V across plates 9.0 cm apart. Show that the verticalacceleration of the electrons due to this field is about 5 × 1015 m s–2
arrow_forward
Check your understanding
A. Solve the problems below. You are required to show the proper solution
with the final answer written inside a box. Make sure to put the final unit
of measurement.
1. If in the process of rubbing the lenses of the eyeglasses, 6.28 x 10 10 electrons were
transferred,
a. what is the charge of the lenses and the nylon cloth?
b. what is the change in their masses?
CS Scanned with CamScanner
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PROBLEM-SOLVING: Given the following situations below, read thoroughly the problem and identify what is asked. Provide your answers and solutions
either through photos of your calculations or by typing on the provided field with the final answer highlighted.
An electrical wire is rated up to 8A when it was used to pass 300c of charge for 12s. W the rated current of the electrical wire be enough to the
actual electrical demand? What do you think will happen to the wire? Provide a short statement and support it with computations.
arrow_forward
Answer the following questions and for figure check the attached image
1.What is the limitation of Coulomb’s law? If you have a single charge in the entire universe, can you measure the electric field of this charge at any point? 2. What is the importance of Gauss’s law? Show that Coulomb’s can be a special case of Gauss’s law. 3. Figure shows the arrangements of electric field lines. If an electronis released at point B, what would happen to this electron and why?Explain. If you move the electron from B to A, what would happento its potential energy? Explain.
4. Figure shows two charged particles that are separated by distance X on an axis. The charges are held fixed. Where should a third charge, q, be placed on the axis such that the net force on q is zero? Explain. Can you determine its distance?
arrow_forward
Compute for the following. Round your answers into to 2 significant figures.
1. What is the charge of an object that has 3,000,000 excess electrons?
2. What is the charge of an object that has 5,000,000 electron deficits?
3. How many excess electrons are there in an object with a charge if -3.6 ×10^-17 C?
arrow_forward
Use the attached diagram to answer the following questions.
1. At P the electric field is zero. Explain how the electric field can be zero.
2. The magnitude of the charge on X is Q and that on Y is q. The distance between X and Y is 0.600 m. The distance between P and Y is 0.820 m.Determine, to one significant figure, the ratio Q/q.
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Activity 1. Visual Thinking Approach: Types of Charging
Directions. Decide what type of charging is depicted on each of the given illustrations by writing your answer on the space provided.
1. After being rubbed, a plastic ruler can attract paper scraps. 2. Charging a balloon through friction and place the balloon near pieces of paper.3. You are touching acharged piece of metal with a negatively charged glass rod.______________________ ______________________ _____________________
Processing Questions:1. What are the types of charging? _________________________________________2. Based on the pictures above, describe each type of charging. __________________.
Activity 2. Charging objects by frictionObjectives: Explain the role of electron transfer in electrostatic charging by rubbing.Materials: tissue paper, a human hair, balloons, silk, plastic ruler, glass rod, copperProcedures:1. Cut the tissue paper into tiny bits.2. Rub the balloon across a human hair. Move the balloon near the tiny…
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I cant seem to figure this question out. No matter what formula I use I keep getting it wrong. Really need help finding the correct answer. Thanks Below is a transcript of the question incase its hard to see the picture
Two particles having charges of 0.550 nCnC and 13.8 nCnC are separated by a distance of 1.30 mm.
PART A
At what point along the line connecting the two charges is the net electric field due to the two charges equal to zero?
Express your answer in meters.
CORRECT ANSER IN BOX
The electric field is zero at a point =
0.217
mm from 0.550 nCnC .
PART B
Where would the net electric field be zero if one of the charges were negative?
Enter your answer as a distance in meters from the charge initially equal to 0.550 nCnC.
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Please help me with my hw. Tysm❤️
Instruction: Explain all answers in 6-7 sentences.
1. Explain the concept of charging in the phenomena of thunder and lightning.
2. Explain the process of photocopying using the concept of electrostatics.
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assignment: make an introduction about triboelectric series.
this is the example:
goodafternoon everyone. there are 3 ways of charging namely rubbing, conduction, and induction. but for our presentation we’ll be focused on rubbing also known as friction. so when we rub two objects together. one of them will lose electrons and the other one will gain. example is a balloon rubbed on our hair. what do you think will be the positive and the negative one?
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Describe the interaction between a nucleus of iron (Z = 26) and an electron located at a distance of
0.6 × 10-¹0 m from the nucleus.
Ze
Œ
-e
1. What is the electric field produced by the nucleus at the electron's position?
The magnitude of E-field produced by the nucleus, E =
The electric field points Select an answer the nucleus.
2. What is the electrostatic force on the electron produced by the nucleus?
The magnitude of the force, F =
Units Select an answer ✓
Units Select an answer ✓
The force on the electron points Select an answer the nucleus.
3. The electron produces it's own electric field at the position of the nucleus, find this electric field.
The magnitude of E-field produced by the electron, E =
This electric field points Select an answer the electron.
4. What is the force on the nucleus produced by the electron?
The magnitude of the force, F =
The force on the nucleus points Select an answer ✓ the electron.
Units Select an answer ✓
Units Select an answer ✓
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ostatics and Current X
learn2021.ukzn.ac.za/mod/quiz/review.php?attempt=D743808&cmid3D236845
ne
Dashboard
Events
My courses
This course
EGuides
%Quick links
Three different charged particles are placed as shown in the diagram. The distance between g, and 9, is 0.2um, and the distance
between q2 and q3 is 0.4pm. What is the force on charge q2 given that: q,= 2e, q,= -3e and q3= -5e.
O out
q1
q2
q3
O a.
1.3x10 14N
b. 1.14x10-14N
C. 2.16x10 14N
d.
3.46×1014N
e. 4.08x10-14N
Your answer is incorrect.
The correct answer is:
4.08x104N
P Type here to search
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Part D: Conclusions
28. Do the experimentally determined capacitance measurements match the value marked? Are they
close?
29.
Would the capacitor discharge more quickly or more slowly if we had used a capacitor with a
smaller value of capacitance? Explain.
30. Why does the capacitor charge almost instantly when the switch is closed?
31. Why does the capacitor discharge more slowly when the switch is opened compared to charging?
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Activity 2 – Coulomb’s Law and Net Electric Field
Solve the following word problems. Show complete solutions to your answers.
3. A charge of 12 mC when placed in electric field experiences a force of 648 N. What is the magnitude of the electric field strength?
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on the given space below. Encircle your final answer, write it in scientific
notation with 2 decimal places (if possible).
1. What is the power input to an electric heater that draws 4 A from a 140-V outlet?
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Problem Solving Questions
Show your complete mathematical solution for the
following problems.
Round your numerical answers to the nearest thousandths.
Enclose your final answers in a rectangle.
I.
1. Find the electric field intensity at the point (5,3,0) m in
Cartesian coordinates due to a point charge Q = 0.5 µC at the
origin.
2. An infinite uniform line charge with a line charge density
of 50 nC/m lies along the z-axis. Find the electric field
intensity at the point (3,4,5) m.
3. Charge is distributed uniformly over the plane y = -5 cm
with a surface charge density of 1/36n nC/m². Find the
Electric field intensity.
4. Find the charge in the volume defined by 0
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What's More
Directions: Study the table below and answer the following questions in your
Science activity notebook.
Table 1. Number of Protons and Electrons in Materials X, Y, and Z
umber of Protons
Number of Electrons
Materials
32
30
Y
22
28
18
18
1. Which material's in the table could attract a negatively charged
object?
2. Which material/s in the table could attract an uncharged object?
3. Which material/s in the table could attract each other?
4. Show the arrangements for the materials X, Y, and Z attracting
each other.
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Learning Task 3: Problem Solving
Directions: Read and analyze the problems below. Solve for what is asked. Make
sure to follow G-A-S format shown in the previous examples.
1. Calculate the electric field strength from a 1.25x10-8C charge if the test
charge is placed 2.50x10-Sm.
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eu 8. Pull the required charges to obtain the arrangements shown below (one at the time). Use
the superposition principle and:
13
a. Draw the net electric field at the position of the E-field sensor.
b.
Write an expression for the net electric field at the position of the E-field sensor
(show all your work).
c.
Find the magnitude and direction of the net electric field at the position of the E-field
sensor (click on "show numbers" and verify your answers
Note all charges are fixed at the grid, and 1 box = 0.1 m.
0
+
+
+
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Topic: Ink Jet Printers and Electrostatic Painting
I. The steps/processes involved based on electrostatics
II. Cite three important and practical (useful) safety precautions
THE OUTPUT MUST BE ENCODED
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Work out what would happen if a grounded pith ball came near the electroscope. Draw where the charges would be. Try this out, making sure the pith ball doesn’t touch the electroscope.
Now work out what would happen if the pith ball touched the electroscope. Let the pith ball bounce against the electroscope, and then draw the charges to show why it acts differently (or should act differently) at this point.
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Coulomb's Law. Directions: Solve the following question involving Coulomb's Law.
Refer to the example problem in the box below. Show your solution and box your
final answer.
5. As shown in figure below, three charged particles are arranged in a line. Charge
A = -5 µC, charge B = +10 µC and charge C = -12 µC. Calculate the net
electrostatic force on particle B due to the other two charges.
Page 3 of 3
cm
Show your solution and answer for the net electrostatic force on particle
B due to the other two charges.
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Can you explain these topics a little bit in detail!
Electric Forces – Write down these equations, describe the relationship between like and opposite charges. How do we set up problems?
Electric Fields – How do we arrive to this conclusion? What’s the calculation for uniform charge densities?
Gauss’s Law – What’s the setup? What advantage do we get out of this?
Electric Potential – We’ve started this chapter. What’s the setup and how did we arrive to this conclusion?
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1.4.3 The Van de Graaff Generator
7. a. What was the charge put on the electroscope?
b. Using words and charge diagrams, what would happen to the electroscope if a positive charge were brought near
1 before
2 Charge is brought near
c Using words and charge diagrams, what would happen to the clectroscope if a negaative charge were brought near
1 before
2 Charge is brought near
d. What happened to the gold foil when the proof plate was brought near?
e. What is the charge on the proof plate and therefore on the Van de Graaff Generator?
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2. A negatively-charged oil drop weighs 9.0 x 10-15 N. The drop is suspended in an electric field of 6.0 x 103 N/C.a. What is the charge on the oil drop?b. How many electrons does it carry?
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decide if the given statement is true or false,and give a brief justification for your answer.If true, you can quote a relevant definition or theorem . If false,provide an example,illustration,or brief explanation of why the statement is false.Q. If R = 4 OHM, L = 4 H, and C = 1 \17 F, then the RLC is underdamped.
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Derived the following formula according to what is being asked.
A. Get the value of Q from the given formula below.
Q
B. If E= Fe/qand F= q1q2/ r2, what would be the value of E, if you will
expand it using the given value of force from Coulomb's formula?
c. Obtain the value of E from the (B) problem and the area of a sphere, which
represents A in the given formula, and then expand the formula of 0=E-A.
D. Obtain the value of E from the (B) problem and the area of a cylinder,
which represents A in the given formula, and then expand the formula of
0=E-A.
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Simply the circuit to get the equivalent circuit. Show all circuits step by step. R1= 8 ohms, R2= 30 ohms, R3= 6 ohms, R4= 9 ohms, V= 54V
A. What is the equivalent resistance?B. What is the current in R2?C. What is the potential difference across R3?D. What is the power dissipated in R4?
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Read and analyze the word problem. Solve the problem by identifying the given and formula needed. Write all the necessary given, substitution, conversion if there’s any, formula used and computations. Highlight the final answer.
1. In 1 minute, a 4.0 A current flows in a simple circuit.
a. How much charge passes through the circuit during 1 minute?
b. How many electrons would this represent?
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Related Questions
- Capacitance, Charge and Voltage: Q = CV 1. Click the Reset Button on the bottom right of the PHET simulation. 2. CHECK Plate Charges and Bar Graphs boxes in the upper right so your display resembles the graph below. 3. SET the Plate Area to 200 mm² and the Separation to 4.0 mm. Capactance Tup Pate Charge oc Sured Energy Pu Charges r Graphs O e Fd Cument Direction 1500 V 4. Connect the voltmeter across the capacitor by placing the red on the top plate and black on bottom. If the voltmeter reads a negative, switch the red and black. 5. Set the battery Voltage to 0.25 V. Record the measured plate charge, Q. 6. Repeat Step 5 for each Voltage in Table 3. Table 3: Charge and Voltage Voltage |(V) Plate Charge |(pC) 0.25 V 0.50 V 0.75 V 1.00 V 1.25 V 1.50 Varrow_forwardDirections: Answer each of the following items. Write all pertinent solutions including illustrations and box your final answer. 1. One charge of 2C is 1.5meters away from a -3C charge. Determine the force exerted on each other.1. A negative charge of -200 micro coulomb and a positive charge of 800 micro coulomb are separated by a distance of 30 centimeters. What is the force between the two charges?1. How far apart are two charges one of magnitude 3 micro coulomb and the other of magnitude 5 micro coulomb if the force between them is 20 n ?1. A -6 micro coulomb charge exerts an attractive force of 65N on a second charge that is 5cm away.What is the magnitude of the second charge?arrow_forwardThe diagram below illustrates an experiment with electrons. A beam of electrons iscreated using an electron gun, and deflected using an electric field. i.Explain how the electron gun creates a beam of electrons. Add to the diagramif that will help your explanation.ii.The electric field which deflects the beam is created by applying a potentialdifference of 2500 V across plates 9.0 cm apart. Show that the verticalacceleration of the electrons due to this field is about 5 × 1015 m s–2arrow_forward
- Check your understanding A. Solve the problems below. You are required to show the proper solution with the final answer written inside a box. Make sure to put the final unit of measurement. 1. If in the process of rubbing the lenses of the eyeglasses, 6.28 x 10 10 electrons were transferred, a. what is the charge of the lenses and the nylon cloth? b. what is the change in their masses? CS Scanned with CamScannerarrow_forwardPROBLEM-SOLVING: Given the following situations below, read thoroughly the problem and identify what is asked. Provide your answers and solutions either through photos of your calculations or by typing on the provided field with the final answer highlighted. An electrical wire is rated up to 8A when it was used to pass 300c of charge for 12s. W the rated current of the electrical wire be enough to the actual electrical demand? What do you think will happen to the wire? Provide a short statement and support it with computations.arrow_forwardAnswer the following questions and for figure check the attached image 1.What is the limitation of Coulomb’s law? If you have a single charge in the entire universe, can you measure the electric field of this charge at any point? 2. What is the importance of Gauss’s law? Show that Coulomb’s can be a special case of Gauss’s law. 3. Figure shows the arrangements of electric field lines. If an electronis released at point B, what would happen to this electron and why?Explain. If you move the electron from B to A, what would happento its potential energy? Explain. 4. Figure shows two charged particles that are separated by distance X on an axis. The charges are held fixed. Where should a third charge, q, be placed on the axis such that the net force on q is zero? Explain. Can you determine its distance?arrow_forward
- Compute for the following. Round your answers into to 2 significant figures. 1. What is the charge of an object that has 3,000,000 excess electrons? 2. What is the charge of an object that has 5,000,000 electron deficits? 3. How many excess electrons are there in an object with a charge if -3.6 ×10^-17 C?arrow_forwardUse the attached diagram to answer the following questions. 1. At P the electric field is zero. Explain how the electric field can be zero. 2. The magnitude of the charge on X is Q and that on Y is q. The distance between X and Y is 0.600 m. The distance between P and Y is 0.820 m.Determine, to one significant figure, the ratio Q/q.arrow_forwardActivity 1. Visual Thinking Approach: Types of Charging Directions. Decide what type of charging is depicted on each of the given illustrations by writing your answer on the space provided. 1. After being rubbed, a plastic ruler can attract paper scraps. 2. Charging a balloon through friction and place the balloon near pieces of paper.3. You are touching acharged piece of metal with a negatively charged glass rod.______________________ ______________________ _____________________ Processing Questions:1. What are the types of charging? _________________________________________2. Based on the pictures above, describe each type of charging. __________________. Activity 2. Charging objects by frictionObjectives: Explain the role of electron transfer in electrostatic charging by rubbing.Materials: tissue paper, a human hair, balloons, silk, plastic ruler, glass rod, copperProcedures:1. Cut the tissue paper into tiny bits.2. Rub the balloon across a human hair. Move the balloon near the tiny…arrow_forward
- I cant seem to figure this question out. No matter what formula I use I keep getting it wrong. Really need help finding the correct answer. Thanks Below is a transcript of the question incase its hard to see the picture Two particles having charges of 0.550 nCnC and 13.8 nCnC are separated by a distance of 1.30 mm. PART A At what point along the line connecting the two charges is the net electric field due to the two charges equal to zero? Express your answer in meters. CORRECT ANSER IN BOX The electric field is zero at a point = 0.217 mm from 0.550 nCnC . PART B Where would the net electric field be zero if one of the charges were negative? Enter your answer as a distance in meters from the charge initially equal to 0.550 nCnC.arrow_forwardPlease help me with my hw. Tysm❤️ Instruction: Explain all answers in 6-7 sentences. 1. Explain the concept of charging in the phenomena of thunder and lightning. 2. Explain the process of photocopying using the concept of electrostatics.arrow_forwardassignment: make an introduction about triboelectric series. this is the example: goodafternoon everyone. there are 3 ways of charging namely rubbing, conduction, and induction. but for our presentation we’ll be focused on rubbing also known as friction. so when we rub two objects together. one of them will lose electrons and the other one will gain. example is a balloon rubbed on our hair. what do you think will be the positive and the negative one?arrow_forward
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SEE MORE QUESTIONS
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Recommended textbooks for you
- College PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College
College Physics
Physics
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:OpenStax College