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Katz - Physics for Scientists and Engineers Adv (Homework)

James Finch

Physics - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 4 / 49

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 10 11 12
2/20 1/10 0/2 1/1 0/1 0/2 –/2 –/3 –/3 –/1 0/2 0/2
Total
4/49 (8.2%)

  • Instructions

    In this Sample Assignment we present several textbook question types found in Physics for Scientists and Engineers: Foundations and Connections, Advance Edition, by Debora M. Katz, published by Cengage Learning.

    • Problems and Questions: Taken directly from the end-of-chapter sections of the textbook, these select problems are available on-line for the convenience of instructors and students.
    • PreLecture Explorations (PLE): Problem 2: Using HTML5 interactive simulations, students can make predictions, change parameters, and observe results. Each PreLecture Exploration presents an engaging simulation based on a relevant scenario and then asks conceptual and analytic questions, guiding students to a deeper understanding and helping promote a robust physical intuition. This is the perfect resource for a flipped classroom or for professors looking for new ways to increase student engagement and interest in the material prior to lecture.
    • Integrated Tutorials (IT): Problem 1: The Integrated Tutorials strengthen students' skills by guiding them through the problem-solving steps identified in their textbook. Tutorials take students through the process, asking questions they will learn to ask themselves when faced with new problems.


    Additional Features
    Read It Every problem includes a link to the appropriate section of a complete interactive eBook.
    Master It Select problems also feature a detailed Master It tutorial, guiding students through prompted steps to solve the specific problem.
    Watch It Students can view 2--5-minute narrated Watch It videos, recorded by Physics instructors to help students solve select problems.


    Click here for a list of all of the questions coded in WebAssign. 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

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1. 2/20 points  |  Previous Answers KatzPSE1 5.IT.002. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
1/1 1/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1
1/50 1/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50
Total
2/20
 
Integrated Tutorial
On April 23, 2002, a passenger train about 35 miles outside of Los Angeles was hit by a freight train. The accident killed two and injured more than 260 people on the passenger train. News reports said that the passenger train came to a complete stop before the collision, and afterward the two trains were locked together moving in the freight train's original direction.

Some people believe the force on the passenger train could have been reduced and perhaps eliminated if it had sped up so that its speed matched that of the freight train instead of stopping before the collision. In this problem we explore that possibility by considering a head-on collision between two particles in two different cases:
Case 1: if particle B was at rest before the collision, and
Case 2: if particle B was moving toward particle A with a speed equal to that of particle A.
In both cases, before the collision particle A is moving at 35.1 m/s toward particle B, the duration of the collision is 2.10 ms, and after the collision particle B is moving at 11.6 m/s in particle A's original direction. Particle B has a mass of 2.76 kg. To keep this problem simple, assume the only force exerted on particle B is due to particle A, and assume the acceleration is constant. Find the magnitude of the force exerted by particle A on particle B. (The mass for particle A can be different in each case.)
Part 1 of 11 - Interpret and Anticipate
This problem involves a special case of one-dimensional kinematics with constant acceleration. We are asked to find the magnitude of the force exerted on particle B in both cases. To do so, we will first need to find the particle's acceleration. The two final answers should be numerical and have the SI units of force. Our goal is to see if the force in Case 2 in which particle B is moving toward particle A is lower (perhaps even zero) compared to Case 1 in which particle B is at rest before the collision.
Part 2 of 11 - Interpret and Anticipate (cont.)
Once we know particle B's acceleration, what principle will we need to apply to find the force?
     Correct: Your answer is correct.
Correct. Since only the force exerted by particle A acts on particle B, we use the acceleration and mass to find this force.
Part 3 of 11 - Interpret and Anticipate (cont.)
In Case 1, particle B is at rest before the collision. We must first find particle B's acceleration. Which sketch best applies to this task?

Correct: Your answer is correct.
Correct. This sketch shows the relevant information: particle B is at rest before the collision and particle B is moving in the same direction as particle A's original direction after the collision. Also, a coordinate system is needed when we solve kinematics problems.
Part 4 of 11 - Solve
When solving a problem involving constant acceleration, it is best to list the five variables. We create our list using the coordinate system from our sketch. To find the best constant acceleration equation, we only need to know if each variable is known, needed, or not needed; we don't need to know the values of each variable at this time.

Which variables are known? (Select all that apply.)



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2. 1/10 points  |  Previous Answers KatzPSE1 5.PLE.002. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7 8 9 10
1/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1
3/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50
Total
1/10
 
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: Atwood Machine
When two massive objects are suspended on opposite sides of a pulley, the arrangement is called an Atwood machine. Two friends, Makena and Dani, are studying physics together, and they decide to delve further into understanding this arrangement.

In this simulation, the cord that connects the two masses is ideal; that is, it is inextensible (does not stretch) and its mass is negligible. Also, the pulley is frictionless with negligible mass, and any air resistance can be neglected. The forces and accelerations of the two masses are shown, along with the tension in the cord.

The sign convention for motion is defined as shown by the arrows. Makena and Dani can change the mass of m1 and m2 by using the sliders. They then can click "start" to set the system in motion.


Click here to open the simulation in a new window.
Part 1 of 9 - Accelerations in an Atwood Machine
Dani and Makena examine the figure shown.
The friends consider the situation for which the mass m1 is initially moving downward. Makena and Dani discuss the acceleration in this case. Which of Makena's statements could be correct?
     Correct: Your answer is correct.
Makena is correct. She realizes that the rope connects the masses, so if one accelerates, both will accelerate, but she has no knowledge of the masses involved, so nothing definite can be said about the motion of the system without knowing the masses.
Part 2 of 9 - Acceleration of the System
Makena and Dani finally realize that because the masses are connected by an inextensible cord, if one goes down, the other must be going up.

The two friends decide to use a simulation to gain a better understanding of an Atwood machine. Dani sets the masses equal to any particular values, with
m2 > m1.
 What can Makena say about the magnitudes of the acceleration of m1 and m2?
    
Part 3 of 9 - Tension in the Cord
The friends realize that the acceleration magnitudes are equal for any nonzero values of m1 and m2. For
m2 > m1,
 Makena and Dani take T1 and T2 to be the magnitudes of the tension in the cord connected to m1 and m2, respectively. Which of Makena's statements is true?
    


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3. 0/2 points  |  Previous Answers KatzPSE1 5.P.027.MI. My Notes
Question Part
Points
Submissions Used
1 2
0/1 0/1
1/50 1/50
Total
0/2
 
A particle of mass m1 accelerates at 4.10 m/s2 when a force F is applied. A second particle of mass m2 experiences an acceleration of only 1.35 m/s2 under the influence of this same force F.
(a) What is the ratio of m1 to m2?
m1
m2
 = Incorrect: Your answer is incorrect.
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully.

(b) If the two particles are combined into one particle with mass
m1 + m2,
 what is the acceleration of this particle under the influence of this force F?
Incorrect: Your answer is incorrect.
Your response differs from the correct answer by more than 100%. m/s2

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4. 1/1 points  |  Previous Answers KatzPSE1 5.P.005. My Notes
Question Part
Points
Submissions Used
1
1/1
3/50
Total
1/1
 
In a science-fiction movie, the hero must get from one spaceship to another, which is several kilometers away. The hero (wearing the appropriate boots) stands on his ship and runs along its surface toward the other ship. When he reaches the edge of his ship, he jumps toward the other ship. Assuming he is far from any major sources of gravity such as planets and friction is negligible. Does he arrive with a lower speed, higher speed or about the same speed at which he left his ship? Explain.
     Correct: Your answer is correct.
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5. 0/1 points  |  Previous Answers KatzPSE1 5.P.011. My Notes
Question Part
Points
Submissions Used
1
0/1
2/50
Total
0/1
 
Three forces act on an object with
F1 = (6.03i − 11.17j) N
 and
F2 = (−1.45i − 13.53j) N.
 If the net force on the object is zero, what is the unknown force,
F3?
(Express your answer in vector form.)
F3 =
4
Incorrect: Your answer is incorrect. N
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6. 0/2 points  |  Previous Answers KatzPSE1 5.P.022. My Notes
Question Part
Points
Submissions Used
1 2
–/1 0/1
0/50 1/50
Total
0/2
 
A particle with mass
m = 4.20 kg
 accelerates according to
a = (−3.40i + 1.50j) m/s2.
(a) What is the net force acting on the particle? (Express your answer in vector form.)
F =
N

(b) What is the magnitude of this force?
Incorrect: Your answer is incorrect.
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. N
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7. –/2 points KatzPSE1 5.P.025. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/1
0/50 0/50
Total
–/2
 
The starship Enterprise has its tractor beam locked onto some valuable debris and is trying to pull it toward the ship. A Klingon battle cruiser and a Romulan warbird are also trying to recover the item by pulling the debris with their tractor beams as shown in the figure below.
(a) Given the following magnitudes of the tractor beam forces, find the net force experienced by the debris:
FEnt = 6.53 ✕ 106 N,
FRom = 2.15 ✕ 106 N,
 and
FKling = 8.05 ✕ 105 N.
 (Express your answer in vector form. Assume the debris is at the origin, the Klingons are along the +x axis and the Enterprise is along the +y axis.)
Fnet =
N

(b) If the debris has a mass of 2549 kg, what is the net acceleration of the debris? (Express your answer in vector form.)
anet =
m/s2
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8. –/3 points KatzPSE1 5.P.029. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/50 0/50 0/50
Total
–/3
 
Two forces
F1 = (62.13i − 12.93j) N
 and
F2 = (19.73i − 80.52j) N
 are exerted on a particle. The particle's mass is 17.75 kg.
(a) Find the particle's acceleration in component form. (Express your answer in vector form.)
a =
m/s2

(b) What are the magnitude and direction of the acceleration?
magnitude     m/s2
direction     ° counterclockwise from the +x axis
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9. –/3 points KatzPSE1 5.P.046. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/50 0/50 0/50
Total
–/3
 
A heavy crate of mass 54.0 kg is pulled at constant speed by a dockworker who pulls with a 355-N force at an angle θ with the horizontal (see figure below). The magnitude of the friction force between the crate and the pavement is 203 N.
(a) Draw a free-body diagram of the forces acting on the crate.


(b) What is the angle θ of the rope with the horizontal?
°

(c) What is the magnitude of the normal force exerted by the pavement on the crate?
N
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10. –/1 points KatzPSE1 5.P.049. My Notes
Question Part
Points
Submissions Used
1
–/1
0/50
Total
–/1
 
A block with mass m1 hangs from a rope that is extended over an ideal pulley and attached to a second block with mass m2 that sits on a ledge slanted at an angle of 20° (see figure below). Suppose the system of blocks is initially motionless and held still, and then it is released. If
m1 = 6.40 kg
 and
m2 = 3.20 kg,
 find the magnitude of the acceleration of the blocks, assuming there is no friction between the second block and the ledge.
m/s2
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11. 0/2 points  |  Previous Answers KatzPSE1 5.P.063. My Notes
Question Part
Points
Submissions Used
1 2
0/1 0/1
1/50 1/50
Total
0/2
 
A 70.0-g arrow, fired at a speed of 115 m/s to the left, impacts a tree, which it penetrates to a depth of 14.0 cm before coming to a stop. Assuming the force of friction exerted by the tree is constant, what are the magnitude and direction of the friction force acting on the arrow?
magnitude     Incorrect: Your answer is incorrect.
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. N
direction     Incorrect: Your answer is incorrect.
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12. 0/2 points  |  Previous Answers KatzPSE1 5.P.068. My Notes
Question Part
Points
Submissions Used
1 2
0/1 0/1
1/50 1/50
Total
0/2
 
A boulder of mass 88.0 kg rests directly on a spring with a spring constant of 6860 N/m.
(a) What is the compression of the spring?
Incorrect: Your answer is incorrect.
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. m

(b) Now, instead, the boulder and the spring are in an elevator accelerating upward at 5.30 m/s2. What is the compression of the spring in this case?
Incorrect: Your answer is incorrect.
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. m
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