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Lindenfeld and Brahmia-Physics: The First Science (Homework)

James Finch

Physics - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 2 / 24

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

Last Saved : n/a Saving...  ()

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Question
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2/24 (8.3%)

  • Instructions

    Here are some textbook questions from Physics: The First Science 1/e by Peter Lindenfeld and Suzanne White Brahmia published by Rutgers University Press.

    The WebAssign content for Physics: The First Science includes a bank of more than 350 questions including the four types of end-of-chapter problems included in the book.

      Key Features of this textbook collection.
    • Over half of the end-of-chapter problems from the textbook
    • Guided review (GR) questions, which match back to examples worked in the chapter
    • Problems and reasoning skill building (P) questions
    • Multiple choice (MC) conceptual questions
    • Synthesis (S) 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

Your last submission is used for your score.

1. –/1 points LinPhysFS1 4.GR.002. My Notes
Question Part
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–/1
 
A car whose mass is 1360 kg accelerates with
a = 1.5 m/s2.
 What is the magnitude of the net force on the car?
N
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2. 2/2 points  |  Previous Answers LinPhysFS1 4.GR.006. My Notes
Question Part
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1 2
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2/2
 
F1
 and
F2
 are two horizontal forces of 50 N each, acting on a wagon. They are at 45° to the x-axis and at right angles to each other. A third force,
F3
, also 50 N, acts along the positive x-axis. What are the magnitude and direction of the net force on the wagon?
magnitude     Correct: Your answer is correct. N
direction     Correct: Your answer is correct.
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3. –/2 points LinPhysFS1 4.GR.014. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/1
0/50 0/50
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–/2
 
A toboggan slides down a hill inclined at 21° with an acceleration of 1.8 m/s2. Draw a force diagram showing all the forces. (Let Fet represent the force of the Earth on the toboggan, Fn represent the normal force of the hill on the toboggan, Ff represent the frictional force of the hill on the toboggan, and Fp represent the pulling force on the toboggan.)

What other information must you know to calculate the magnitude of each of the forces? (Select all that apply.)

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4. –/1 points LinPhysFS1 4.MC.004. My Notes
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1
–/1
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–/1
 
Marsha is pulling the front of a sled with a force of 172 N. The sled is on ice and its mass is 46 kg (that includes the mass of her younger brother). The rope is at an angle of 12° with the ground. Ignore all effects of friction. (Assume the sled moves along the x-axis and does not rise off the ice. For this problem, use the approximation g = 10 m/s2.)
A student represented this situation mathematically as follows, using SI units:
x direction:
172 = 46ax

y direction:
Fnormal − (46)(10) = (46)(0).
Did the student label anything wrong or forget to include something? Select all of the corrections that should be made (there may be more than one).

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5. –/1 points LinPhysFS1 4.MC.006. My Notes
Question Part
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1
–/1
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–/1
 
When a particle moves in a circle with constant speed, its acceleration is which of the following?
    
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6. –/4 points LinPhysFS1 4.P.010. My Notes
Question Part
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1 2 3 4
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–/4
 
For each of the force diagrams, find Fnet in terms of the magnitudes
F1, F2, F3
 and the angle θ. (In the graphs below, the positive x axis points to the right and the positive y axis points straight up.)

Fnet,x =

Fnet,y =

Fnet,x =

Fnet,y =
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7. –/5 points LinPhysFS1 4.P.012. My Notes
Question Part
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1 2 3 4 5
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–/5
 
A hockey puck of mass M is given a horizontal push of magnitude F.
(a) At what rate does its speed change? (Use any variable or symbol stated above as necessary.)
rate =


(b) Use reasonable values to get numerical results.
Estimate the mass of the puck and the magnitude of the force F.
mass     kg
force     N

Calculate the rate its speed changes. (Use the exact values you entered for the mass and force to make this calculation.)
acceleration     m/s2

Is the answer reasonable?

This answer has not been graded yet.

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8. –/3 points LinPhysFS1 4.P.035. My Notes
Question Part
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1 2 3
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–/3
 
The wheels on your bicycle have a diameter of 51 cm.
(a) What is their angular velocity in rps (revolutions per second) when you ride at 13 mph (= 5.8 m/s)?
rps

(b) What is the angular acceleration if you reach that speed in 8 s, starting from rest?
rad/s2

(c) How many revolutions does the wheel make in that time?
revolutions
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9. –/5 points LinPhysFS1 4.S.003. My Notes
Question Part
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–/5
 
A mouse sits on a horizontal turntable that moves with angular velocity ω. (The turntable has radius R.)
(a) What is the origin of the horizontal force that keeps the mouse from sliding off?
    

(b) What is the maximum value of that force, i.e., the value beyond which the mouse will slide off? (Use the following as necessary: μ, m, g, and R.)
Fmax =


(c) What is the mouse's acceleration while it is sitting on the turntable? (Use the following as necessary: m, g, R, v, and ω.)
amouse =


(d) Write down the relation between the answers to parts (b) and (c) in terms of ω and R, but not v.
μ =


(e) The angular velocity at which the mouse begins to slide is proportional to
Rn.
 What is the value of n?
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