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Serway et al - Physics for Global Sci. & Eng. 2/e (Homework)

James Finch

Physics - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 3 / 32

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

Last Saved : n/a Saving...  ()

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Question
Points
1 2 3 4 5 6 7 8 9
2/3 1/1 0/1 –/6 –/3 –/2 –/1 –/12 –/3
Total
3/32 (9.4%)

  • Instructions

    Building upon Serway and Jewett’s solid foundation in the classic text, Physics for Scientists and Engineers, this global edition is a practical and engaging introduction to Physics. Using international and local case studies and worked examples to add to the concise language and high quality artwork, this text further engages students and highlights the relevance of this discipline to their learning and lives. The WebAssign component for this title features question links to the appropriate section of a complete interactive eBook and instant student feedback.

    Create your course assignments by selecting questions from our bank of end-of-section exercises, as well as enhanced interactive examples with videos.

    Students can view and hear additional instruction through the 2-5 minute Watch It links. Students will also find helpful links to online excerpts from their textbook, tutorials, and videos.

    Every problem includes a link to the appropriate section of a complete interactive eBook, (also available through a dynamic table of contents from the student's WebAssign homepage), allowing students to highlight and take notes as they read.

    Read It - relevant textbook pages

    Watch It - videos of worked examples

    Master It - tutorials

    Many problems include detailed stepped-out solutions, available to students at each instructor's discretion.

    In this assignment we present several textbook question types found in Physics for Global Scientists and Engineers, 2/e by R. Serway, J. Jewett, K. Wilson, A. Wilson, W. Rowlands published by Cengage Learning.

    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.

    The answer key and solutions will display after the first submission for demonstration purposes. Instructors can configure these to display after the due date or after a specified number of submissions.

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. 2/3 points  |  Previous Answers SerPhysAus2 5.CQ.006. My Notes
Question Part
Points
Submissions Used
1 2 3
0/1 1/1 1/1
1/100 2/100 2/100
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2/3
 
Consider a small raindrop and a large raindrop falling through the atmosphere.
(a) Compare their terminal speeds.
    

(b) What are their accelerations when they reach terminal speed?
alarger drop =  Correct: Your answer is correct. seenKey

0

 m/s2
asmaller drop =  Correct: Your answer is correct. seenKey

0

 m/s2
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2. 1/1 points  |  Previous Answers SerPhysAus2 5.QQ.001. My Notes
Question Part
Points
Submissions Used
1
1/1
1/100
Total
1/1
 
You press your physics textbook flat against a vertical wall with your hand. What is the direction of the friction force exerted by the wall on the book?
     Correct: Your answer is correct.
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3. 0/1 points  |  Previous Answers SerPhysAus2 5.P.010. My Notes
Question Part
Points
Submissions Used
1
0/1
1/100
Total
0/1
 
One side of the roof of a building slopes up at 33.5°. A roofer kicks a round, flat rock that has been thrown onto the roof by a neighborhood child. The rock slides straight up the incline with an initial speed of 15.0 m/s. The coefficient of kinetic friction between the rock and the roof is 0.340. The rock slides 10.0 m up the roof to its peak. It crosses the ridge and goes into free fall, following a parabolic trajectory above the far side of the roof, with negligible air resistance. Determine the maximum height the rock reaches above the point where it was kicked.
Incorrect: Your answer is incorrect. seenKey

6.47
Your response differs from the correct answer by more than 100%. m
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4. –/6 points SerPhysAus2 5.P.012. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6
–/1 –/1 –/1 –/1 –/1 –/1
0/100 0/100 0/100 0/100 0/100 0/100
Total
–/6
 
A skydiver of mass 79.5 kg jumps from a slow-moving aircraft and reaches a terminal speed of 52.2 m/s.
(a) What is her acceleration when her speed is 30.0 m/s?
magnitude m/s2
direction

(b) What is the drag force on the skydiver when her speed is 52.2 m/s?
magnitude N
direction

(c) What is the drag force on the skydiver when her speed is 30.0 m/s?
magnitude N
direction

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5. –/3 points SerPhysAus2 5.P.018. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/100 0/100 0/100
Total
–/3
 
A motorboat cuts its engine when its speed is 8.8 m/s and coasts to rest. The equation describing the motion of the motorboat during this period is v = vie-ct, where v is the speed at time t, vi is the initial speed at t = 0, and c is a constant. At t = 18.9 s, the speed is 5.00 m/s.
(a) Find the constant c.
s-1

(b) What is the speed at t = 40.0 s?
m/s
(c) Differentiate the expression for v(t) and thus show that the acceleration of the boat is proportional to the speed at any time.
    
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6. –/2 points SerPhysAus2 5.P.028.MI. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/1
0/100 0/100
Total
–/2
 
A 43.0-kg child swings in a swing supported by two chains, each 2.96 m long. The tension in each chain at the lowest point is 356 N.
(a) Find the child's speed at the lowest point.
m/s

(b) Find the force exerted by the seat on the child at the lowest point. (Ignore the mass of the seat.)
N (upward)

Need Help? Master It

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7. –/1 points SerPhysAus2 5.P.042. My Notes
Question Part
Points
Submissions Used
1
–/1
0/100
Total
–/1
 
A truck is moving with constant acceleration a up a hill that makes an angle ϕ with the horizontal as in the figure below. A small sphere of mass m is suspended from the ceiling of the truck by a light cord. If the pendulum makes a constant angle θ with the perpendicular to the ceiling, what is a? (Use any variable or symbol stated above along with the following as necessary: g.)
a =

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8. –/12 points SerPhysAus2 5.PLE.001. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7 8 9 10 11 12
–/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1
0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100
Total
–/12
 
This question has several parts that must be completed sequentially. If you skip a part of the question, you will not receive any points for the skipped part, and you will not be able to come back to the skipped part.

Prelecture Exploration: Tangential Velocity
Jadon and Sylvia are physics study partners, and they decide to use a simulation to help them understand tangential velocity.

In this simulation, a puck is moving in a circle at constant speed on a frictionless, horizontal surface. The point of view is looking straight down from above. Jadon and Sylvia can click "break" to break the string and observe the subsequent motion of the puck, and can click "reset" to return the puck to its original configuration.

Click here to open the simulation in a new window.
Part 1 of 11 - Forces on the Puck
The pair discusses the forces acting on the puck. Jadon mentions several forces. Which of the following forces act on the puck? (Select all that apply.)



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9. –/3 points SerPhysAus2 5.P.024. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/100 0/100 0/100
Total
–/3
 
Consider a conical pendulum with a bob of mass m = 92.0 kg on a string of length L = 10.0 m that makes an angle of θ = 3.00° with the vertical. (Consider +î to be towards the centre of the circular path and +ĵ to be upward.)
(a) Determine the horizontal and vertical components of the force exerted by the string on the pendulum.
N î + N ĵ

(b) Determine the radial acceleration of the bob.
m/s2
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