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Giordano - College Physics 2/e (Homework)

James Finch

Physics - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 13 / 30

Due : Monday, January 28, 2030 00:00 EST

Last Saved : n/a Saving...  ()

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2/7 2/6 –/2 4/4 1/1 –/2 0/1 –/3 4/4
Total
13/30 (43.3%)

  • Instructions

    College Physics: Reasoning and Relationships 2/e by Nicholas J. Giordano weaves reasoning and relationships into the way students learn introductory physics. The Enhanced WebAssign content for this text picks up on this theme to reinforce critical thinking as well as basic skills. Thousands of end-of-chapter problems, including Reasoning and Relationship tutorials, and concept checks are available in Enhanced WebAssign. In addition, students can review their algebra and trigonometry skills with Quick Prep before they begin or while they are progressing through the College Physics 2e WebAssign course. You can check out a sampling from this program below. WebAssign, easy to use, reliable--a trusted companion to your teaching.

    Questions 1-2 Reasoning and Relationship tutorials provide physical insight and a chance to practice critical thinking (reasoning). Students use experience and intuition to identify missing information, make reasonable estimates, and utilize a 5-step approach to solve the problem. A truly unique feature of this book is the extension of these problems from the textbook to online tutorial format in Enhanced WebAssign. The Reasoning and Relationships tutorials in Enhanced WebAssign are assignable, offer detailed feedback, and provide students with the opportunity to truly internalize the problem-solving process. 


    Question 3 is an Active Figure animation: Active Figures build conceptual understanding, allowing students to view animations and visualize phenomena and processes that can't be represented on the printed page. Students can change variables to see the effects, conduct suggested explorations of the principles involved, and receive feedback on related, conceptual questions.

    Questions 4-5 are Multiple Choice Concept Checks from the text. These questions provide a key opportunity for students to check their conceptual understanding.

    Questions 6-7 Enhanced WebAssign includes thousands of traditional end-of-chapter problems, corresponding to specific problems from Giordano's text. The student can also practice another version which will generate another set of algorithmically generated values for the same question. All end-of-chapter problems have been randomized where possible to yield well over 100 unique sets of numerical values per problem. WebAssign physPad questions are displayed with a rectangular answer box similar to answer boxes used for other question types, but when you click a physPad-enabled answer box, the physPad palette opens, allowing you to answer the question with correctly formatted physics notation. Each problem in Enhanced WebAssign includes a page specific link to the Cengage YouBook.

    The Cengage YouBook lets you tailor the textbook to fit your course and connect with your students. You can remove and rearrange chapters in the table of contents and tailor assigned readings that match your syllabus exactly. Powerful editing tools let you change as much as you’d like–or leave it just like it is. You can highlight key passages or add sticky notes to pages to comment on a concept in the reading, and then share any of these individual notes and highlights with your students, or keep them personal. You can also edit narrative content in the textbook by adding a text box or striking out text. With a handy link tool, you can drop in an icon at any point in the eBook that lets you link to your own lecture notes, audio summaries, video lectures, or other files on a personal website or anywhere on the web. A simple YouTube widget lets you easily find and embed videos from YouTube directly into eBook pages. There is a light discussion board that lets students and instructors find others in their class and start a chat session. The Cengage YouBook helps students go beyond just reading the textbook. Students can also highlight the text, add their own notes, and bookmark the text. Animations play right on the page at the point of learning so that they’re not speed bumps to reading but true enhancements.

    Question 8-9 are Quick Prep tutorials. Quick Prep for physics is offered only through Enhanced WebAssign. It’s algebra and trigonometry math remediation within the context of physics applications and principles. Quick Prep helps students succeed by using narratives illustrated throughout with video examples. The Master It tutorial problems allow students to assess and retune their understanding of the material. The Practice Problems that follow each tutorial allow both the student and the instructor to test the student’s understanding of the material.
    • 67 interactive tutorials
    • 67 additional practice problems
    • Thorough overview of each topic that includes video examples
    • Taken before the semester begins or during the first few weeks of the course
    • Can also be assigned alongside each chapter for “just in time” remediation
    • Topics include: units, scientific notation and significant figures; the motion of objects along a line; functions; approximation and graphing; possibility and error; vectors, displacement, and velocity; spheres; force and vector projections.
    This demo assignment allows many submissions and allows you to try another version of the same question for practice wherever the problem has randomized values.

Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

Your last submission is used for your score.

1. 2/7 points  |  Previous Answers GioCP2 4.RR.050. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7
1/1 0/1 1/1 0/1 0/1 0/1 0/1
1/50 2/50 1/50 2/50 2/50 2/50 2/50
Total
2/7
 

  • Reasoning Problem 4.50

    Consider a baseball player who wants to catch a fly ball which is hit with an initial speed vi = 38 m/s at an angle of 57° with respect to the horizontal. Estimate the force exerted by the ball on the player's glove as the ball is coming to rest. Hint: You will have to estimate the acceleration of the ball, and to do so it is useful to estimate the distance the ball travels while coming to rest in the glove. The mass of a baseball is 0.14 kg.

  • Part 1 - Recognize the Principles

    Which of the following principles or statements will be useful in solving this problem? Hint: Choose two.
    Correct: Your answer is correct.

  • Part 2 - Sketch the Problem

    The figure below shows the problem. The ball travels in a parabolic trajectory (initial speed vi) and lands in the player's glove.

  • Part 3 - Identify the Relationships

    Which of the following quantities will be easiest to estimate using your common sense and experience?
         Incorrect: Your answer is incorrect.

    This is hard to estimate since the time is short.

    If you can estimate the distance Δx the ball travels while it is coming to rest in the glove, which of the following relationships can be used to find the acceleration of the ball? Hint: It is a good approximation to assume the ball is moving with a constant acceleration during this time.
         Correct: Your answer is correct.
    Good.

    If a is the acceleration of the ball and m is its mass, what is the magnitude of the force of the ball on the glove?
         Incorrect: Your answer is incorrect.

    Incorrect. This is the force of gravity on the ball.

  • Part 4 - Solve

    Estimates
    What is the approximate distance the ball travels in the glove, from the moment it first touches the glove to the time it comes to rest?
    Incorrect: Your answer is incorrect.
    Your value is a little small. About how much does the glove compress when the ball is caught? cm

    What is the speed of the ball when it first touches the glove?
    Incorrect: Your answer is incorrect.
    Incorrect. How is the speed of the ball when it lands related to the speed vi when it is hit? m/s

    Calculations (use your estimates)
    Using your estimate for Δx what is the force of the ball on the glove? Recall that the mass of the ball is m = 0.14 kg.
    Incorrect: Your answer is incorrect.
    Please check your arithmetic and be sure to express the value of Δx in meters. N

  • Part 5 - What Does It Mean?

    The force on the ball is much larger than its weight because the stopping distance Δx is short. This is why players use gloves.
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2. 2/6 points  |  Previous Answers GioCP2 4.RR.058. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6
1/1 1/1 –/1 –/1 –/1 –/1
1/50 2/50 0/50 0/50 0/50 0/50
Total
2/6
 

  • Reasoning Problem 4.58

    Consider a commercial passenger jet as it accelerates on the runway during takeoff. This jet has a rock-on-a-string accelerometer installed (as in the figure below). Estimate the angle of the string during takeoff.

  • Part 1 - Recognize the Principles

    The rock-on-a-string accelerometer has been previously analyzed and it was found that the angle θ at which the string hangs is related to the acceleration by
    a = g tan θ.
     To determine the angle we must therefore first find the acceleration. Which of the following approaches could be used to find the acceleration of a plane while it is taking off? Assume the plane moves with a constant acceleration. (Select all that apply.)
    Correct: Your answer is correct.

  • Part 2 - Sketch the Problem

    The sketch below shows the plane as it is just starting from rest and as it is just taking off from the runway.

  • Part 3 - Identify the Relationships

    Let's find the acceleration of the plane by estimating the distance Δx it travels on the runway and the time it spends accelerating as it takes off. If we know these quantities, which of the following relations can be used to find the acceleration? Hint: What is the initial speed vi?
         Correct: Your answer is correct.
    Good.

  • Part 4 - Solve

    Estimates
    Let's first estimate Δx. What is the length of a typical runway as used by a commercial airplane?
    m

    What is the typical time an airplane spends accelerating on the runway before it takes off?
    s

    Calculations (use your estimates)
    Using your estimates for Δx and t, what is the acceleration of the airplane?
    m/s2

    Using your result for the acceleration, what is the angle of the accelerometer string?
    °

  • Part 5 - What Does It Mean?

    The accelerometer angle is small because the acceleration of the airplane is small compared to the acceleration due to gravity. If the acceleration were comparable to g, the ride would be very uncomfortable for the passengers.
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3. –/2 points was GioCP2 4.AF.003. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/1
0/50 0/50
Total
–/2
 
Active Figure 4.3 The Atwood Machine

Instructions Click 'start' to utilize the following Active Figure.

Display in a New Window When two objects of unequal masses are suspended on opposite sides of a frictionless pulley with negligible mass, the arrangement is called an Atwood machine. Suppose an Atwood machine has a mass of m1 = 16.0 kg and another mass of m2 = 17.5 kg hanging on opposite sides of the pulley. Determine the magnitude of the acceleration of the two objects and the tension in the lightweight cord.

RECOGNIZE THE PRINCIPLES

Imagine the situation pictured in the Active Figure. As one object moves upward, the other object moves downward. Because the objects are connected by an inextensible string, their accelerations must be of equal magnitude.

The objects in the Atwood machine are subject to the gravitational force as well as to the forces exerted by the string connected to them. Therefore, this problem involves two particles under a net force.

IDENTIFY THE RELATIONSHIPS

The free-body diagrams for the two objects are shown in the Active Figure. Two forces act on each object: the upward force T with arrow exerted by the string and the downward gravitational force. In problems such as this one the pulley is modeled as massless and frictionless, and the tension in the string is the same on both sides of the pulley. If the pulley has mass or is subject to friction, other techniques must be used to take these factors into account.

The signs used in problems such as this require care. When object 1 accelerates upward, object 2 accelerates downward. Therefore, m1 going up and m2 going down should be represented equivalently by the same acceleration with the same sign. We can do that by defining our sign convention with up as positive for m1 and down as positive for m2.

With this sign convention, the y-component of the net force exerted on object 1 is T − m1g, and the y-component of the net force exerted on object 2 is m2g − T.

SOLVE

Applying Newton's second law to m1 gives the result
(1)
F1 = T − m1g = m1a1.
Do the same thing for m2:
(2)
F2 = m2g − T = m2a2.
The acceleration ay is the same for both objects. When Equation (1) is added to Equation (2), T cancels and we obtain
(3)
−m1g + m2g = m1a + m2a.
Solving Equation (3) for ay and substituting for the given values of m1 = 16.0 kg and m2 = 17.5 kg gives
(4)
a = 
m2 − m1
m1 + m2
g = m/s2.
Substitute Equation (4) into Equation (1) to find T.
T = m1(g + a) = 
2m1m2
m1 + m2
g = N.

SUMMARY
The acceleration given by Equation (4) can be interpreted as the ratio of the magnitude of the unbalanced force
(m2 − m1)g
 to the total mass
(m1 + m2)
 of the system, as expected from Newton's second law. Notice that the sign of the acceleration depends on the relative masses of the two objects.
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4. 4/4 points  |  Previous Answers GioCP2 4.CC.003. My Notes
Question Part
Points
Submissions Used
1 2 3 4
1/1 1/1 1/1 1/1
1/50 2/50 3/50 3/50
Total
4/4
 
The baseball in the figure below travels through the air.
(a) At what point(s) on its trajectory is the acceleration zero?
    


(b) At what point(s) on its trajectory is the vertical component of the velocity zero?
     Correct: Your answer is correct.


(c) At what point(s) on its trajectory is the force on the ball zero?
     Correct: Your answer is correct.


(d) At what point(s) on its trajectory is the speed zero?
     Correct: Your answer is correct.
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5. 1/1 points  |  Previous Answers GioCP2 4.CC.005. My Notes
Question Part
Points
Submissions Used
1
1/1
1/50
Total
1/1
 
How will the angle of the accelerometer string in the figure below depend on the mass of the rock?
     Correct: Your answer is correct.
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6. –/2 points GioCP2 4.P.002. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/1
0/50 0/50
Total
–/2
 
The three forces shown in the figure below act on a particle (with F1 = 49.0 N, F2 = 60.0 N, θ1 = 65.0°, and θ2 = 25.0°). If the particle is in translational equilibrium, find F3, the magnitude of force 3 and the angle θ3.

F3 = N
θ3 = ° (counterclockwise from the +x-axis)
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7. 0/1 points  |  Previous Answers GioCP2 4.P.032. My Notes
Question Part
Points
Submissions Used
1 2 3
0/1 0/0 0/0
3/50 2/50 2/50
Total
0/1
 
A bullet is fired from a rifle with a speed v0 at an angle θ with respect to the horizontal axis (see figure below) from a cliff that is a height h above the ground below.
(a) Calculate the speed of the bullet when it strikes the ground. (Use the following as necessary: v0, h, and g.)
v =
gt


(b) Is your result independent of the value of θ?


Explain.

This answer has not been graded yet.

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8. –/3 points GioCP2 Q1.1.001.Tutorial. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/50 0/50 0/50
Total
–/3
 
 1.1: SIGNIFICANT FIGURES

  • Part 1 - Multiplication and Division

    Dividing 2.54 by 1.3, a calculator produces 1.9538462. However, it would be very imprecise to report 1.9538462 as the answer because it would be leading others astray since this many significant figures in the result implies that the data used is accurate to at least that same number of significant figures. The least accurate number, 1.3, is known to two significant figures; therefore, the answer should be rounded to two significant figures, 2.0, where 1.95 is rounded up to 2.0.

    A general rule is that your answer from the product or division of two numbers should never have more significant figures than the number possessing the least number of significant figures.

    VIDEO EXAMPLE 1:    EXAMPLE 1-1

    Note that 0.0000356 has only three significant figures. The four zeroes between the decimal point and the 3 show only the position of the decimal point and are not considered significant.


Carry out the following arithmetic operations. (Enter your answers to the correct number of significant figures.)
(a) the sum of the measured values 741, 39.8, 0.70, and 3.5
WebAssign will check your answer for the correct number of significant figures.

(b) the product 1.4 × 2.547
WebAssign will check your answer for the correct number of significant figures.

(c) the product 5.48 × π
WebAssign will check your answer for the correct number of significant figures.

Need Help? Master It

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9. 4/4 points  |  Previous Answers GioCP2 Q1.1.002. My Notes
Question Part
Points
Submissions Used
1 2 3 4
1/1 1/1 1/1 1/1
5/50 2/50 2/50 1/50
Total
4/4
 
How many significant figures are there in each of the following?
(a)    7.43 × 10−6
Correct: Your answer is correct.

(b)    3.6 × 109
Correct: Your answer is correct.

(c)    2.320 × 109
Correct: Your answer is correct.

(d)    0.022
Correct: Your answer is correct.
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