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Moaveni-Engineering Fundamentals 7/e (Homework)

James Finch

Engineering, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 4 / 57

Due : Sunday, January 27, 2030 12:00 EST

Last Saved : n/a Saving...  ()

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Question
Points
1 2 3 4 5 6 7 8 9 10 11 12 13
1/2 1/3 2/2 –/3 –/3 0/1 –/4 –/1 –/3 –/3 –/11 –/12 0/9
Total
4/57 (7.0%)

  • Instructions

    Engineering Fundamentals: An Introduction to Engineering, 7th Edition, written by Saeed Moaveni and published by Cengage Learning, helps students develop strong problem-solving skills and the solid foundation in fundamental principles needed to become analytical, detail-oriented, creative engineers. An initial overview examines what today's engineers do, with behind-the-scenes glimpses into areas of specialization. Candid discussions emphasize what it takes to succeed as an engineer today. This edition covers basic physical concepts and laws important in engineering studies and on the job. The author connects these principles to professional engineering success as he highlights the work of practicing engineers around the globe. Available via WebAssign is MindTap Reader, Cengage's next-generation eBook, and other digital resources.

    WebAssign provides a wide range of exercises that enable you to:
    • Let students review and reference question concepts (#1-12: Read It, Watch It)
    • Help students to build conceptual understanding (#13: Expanded Problem)
    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. 1/2 points  |  Previous Answers MoaveniEng7 7.1.022. My Notes
Question Part
Points
Submissions Used
1 2
1/1 –/1
6/100 0/100
Total
1/2
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

A machinist in an engineering machine shop has ordered a sheet of plastic with dimensions of 11.7 ft ✕ 13 ft ✕ 1 in. width, length, and thickness, respectively. Can the machinist get the sheet of plastic inside the machine shop provided that the door dimensions are 4.5 ft ✕ 10.8 ft? (Assume the sheet cannot be bent.)
     Correct: Your answer is correct.
Give the maximum dimensions of a sheet that can be moved inside the shop and explain how. (Submit a file with a maximum size of 1 MB.)

This answer has not been graded yet.

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2. 1/3 points  |  Previous Answers MoaveniEng7 9.3.045. My Notes
Question Part
Points
Submissions Used
1 2 3
1/1 –/1 –/1
1/100 0/100 0/100
Total
1/3
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

Air with a density of 0.45 kg/m3 enters an experimental jet engine at a rate of 165 m/s. The inlet area of the engine is 4.0 ft2. After fuel is burned, the air and combustion byproducts leave the engine with a velocity of 670 m/s through an outlet area of 3.0 ft2. What is the average density of the gas exiting the engine? Express your answer in kg/m3, slugs/ft3, and lbm/ft3.
A jet engine is oriented such that the left end is the inlet area and the right end is the outlet area. The outlet area is smaller than the inlet area. Air enters the inlet area and air and combustion byproducts exit the outlet area.
density (kg/m3)   Correct: Your answer is correct. kg/m3 density (slugs/ft3)   slugs/ft3 density (lbm/ft3)   lbm/ft3

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3. 2/2 points  |  Previous Answers MoaveniEng7 10.3.033. My Notes
Question Part
Points
Submissions Used
1 2
1/1 1/1
2/100 2/100
Total
2/2
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

Determine the moment (in ft · lb) created by the weight of the traffic light about point O. The dimensions of the traffic light post and arm are shown in the accompanying figure. The traffic light weighs 27 lb.
A vertical traffic post rests on the ground, with point O at its lower end at the point of contact between the post and ground. The post is 18 ft tall. The upper end of the post supports the left end of a horizontal beam, or arm. The arm is 24 ft long. The right end of the arm supports the top end of a traffic light held above the ground, and the traffic light hangs vertically downward.
magnitude Correct: Your answer is correct. ft · lb direction Correct: Your answer is correct.

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4. –/3 points MoaveniEng7 11.2.008. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/100 0/100 0/100
Total
–/3
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

A manufacturer of loose-fill cellulose insulating material provides a table showing the relationship between the thickness of the material and its R-value. The manufacturer's data is shown in the accompanying table.
R-value
ft2 · °F
Btu
h
 		Thickness (in.)
R-40 11.0
R-32 8.8
R-24 6.6
R-19 5.2
R-13 3.6
(a)
Calculate the thermal conductivity (in Btu/(h · ft · °F)) of the insulating material.
Btu/(h · ft · °F)
Determine how thick (in inches) the insulation should be to provide R-values of the following.
(b)
R-30
in.
(c)
R-20
in.

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5. –/3 points MoaveniEng7 13.3.012. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/100 0/100 0/100
Total
–/3
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

An air-conditioning unit has a cooling capacity of 23,000 Btu/h. If the unit has a rated energy efficiency ratio (EER) of 13, how much electrical energy (in kWh) is consumed by the unit in 1 h?
kWh
If a power company charges 17 cents per kWh usage, how much would it cost (in dollars) to run the air-conditioning unit for a month (31 days), assuming the unit runs 8 h a day?
$
What is the coefficient of performance (COP) for the given air-conditioning unit?

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6. 0/1 points  |  Previous Answers MoaveniEng7 15.4.022. My Notes
Question Part
Points
Submissions Used
1
0/1
1/100
Total
0/1
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

Solve the following set of equations using MATLAB.
111
261
−316
 
x1
x2
x3
 = 
9
28
3
(x1, x2, x3) = 
√4
Incorrect: Your answer is incorrect.

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7. –/4 points MoaveniEng7 19.2.035. My Notes
Question Part
Points
Submissions Used
1 2 3 4
–/1 –/1 –/1 –/1
0/100 0/100 0/100 0/100
Total
–/4
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

The air temperature and speed of sound for the U.S. standard atmosphere is given in the accompanying table.
Altitude (m) Air Temperature (K) Speed of Sound (m/s)
500 284.9 338
1,000 281.7 336
2,000 275.2 332
5,000 255.7 320
10,000 223.3 299
15,000 216.7 295
20,000 216.7 295
Using linear interpolation, estimate the air temperatures (in K) and the corresponding speeds of sound (in m/s) at altitudes of 1,200 m and 8,000 m. (Round your answers to at least the nearest integer.)
1,200 m
air temperature K speed of sound m/s
8,000 m
air temperature K speed of sound m/s

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8. –/1 points MoaveniEng7 19.5.021. My Notes
Question Part
Points
Submissions Used
1
–/1
0/100
Total
–/1
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

Solve the following set of equations using the Gaussian method. (If there is no solution, enter NO SOLUTION.)
111
215
−351
 
x1
x2
x3
 = 
9
23
17
(x1, x2, x3) = 

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9. –/3 points MoaveniEng7 20.4.039. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/100 0/100 0/100
Total
–/3
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

As a chemical engineer working for a tire manufacturer, you collect the following data in order to test the performance of tires.
Miles with Acceptable (Reliable) Wear Frequency
30,000 12
35,000 27
40,000 33
45,000 39
50,000 22
55,000 16
Plot the data.

Calculate the mean and standard deviation (in miles).
mean mi standard deviation mi

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10. –/3 points MoaveniEng7 21.4.022. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/100 0/100 0/100
Total
–/3
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

You need to borrow $16,000 to buy a car, so you visit two banks and are given two alternatives. The first bank allows you to pay $3461.05 at the end of each year for six years. The first payment is to be made at the end of the first year. The second bank offers equal monthly loan payments of $272.78 for six years, starting at the end of first month. What are the interest rates that the banks are charging? (Enter the effective interest rates as percentages.)
first bank % second bank %
Which alternative is more attractive? (Select the bank with the lower effective interest rate.)
    

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11. –/11 points MoaveniEng7 16.3.014. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7 8 9 10 11
–/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
Total
–/11
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

Write a Python program to create a table that shows the relationship between the units of temperature in degrees Celsius and Fahrenheit in the range of 50°C to 150°C. Use increments of 10°C.
numpy as np
TC = np.arange(50, 160, )
TF = *TC + 32
under_line = '_' # for print formatting
blank_space = '' # for print formatting
(30*under_line)
('\n', 5*blank_space, 'T (°C)', 20*blank_space, 'T (°)F')
(30*under_line, '\n')
i, (TC, ) in (zip(TC, )):\
     print(3*blank_space, f'{TC:.1f}', 25*blank_space, f'{ :.1f}')
# The back slash means continuation of the line of code.

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12. –/12 points MoaveniEng7 16.3.024. 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 exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

A Pitot tube is a device commonly used in a wind tunnel to measure the speed of the air flowing over a model. The air speed is determined from the equation
V = 
2Pd
ρ
,
where we get the following.
V = air speed (m/s)
Pd
 = dynamic pressure (Pa) ρ = density of air (1.23 kg/m3)
Write a Python program to create a table that shows the air speed for the range of dynamic pressures of 500 Pa to 800 Pa. Use increments of 50 Pa.
numpy as np
dynP = np.arange(500, 850, )
rho =
V = np.sqrt(2* /rho) # use np.sqrt to take the square roots of the elements in dynP
under_line = '_' # for print formatting
blank_space = '' # for print formatting
(40*under_line)
('\n', 4*blank_space, 'Dynamic Pressure (Pa)', 10*blank_space, 'Air Speed (m/s)')
(40*under_line, '\n')
i, (dynP, ) in (zip(dynP, )):\
     print(4*blank_space, f'{dynP:.1f}', 40*blank_space, f'{ :.2f}')
# The back slash means continuation of the line of code.

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13. 0/9 points  |  Previous Answers MoaveniEng7 7.4.046.EP. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7 8 9
–/1 –/1 –/1 –/1 –/1 0/1 –/1 –/1 0/1
0/100 0/100 0/100 0/100 0/100 1/100 0/100 0/100 1/100
Total
0/9
 
  • This exercise will help students to build conceptual understanding.
  • Expanded Problems enhance student understanding by going beyond a basic exercise and asking students to solve each step of the problem in addition to their final answer.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.

Consider a 113 ft long, 5 in. type M copper tubing. (Due to the nature of this problem, do not use rounded intermediate values in your calculations—including answers submitted in WebAssign.)
What is the outside diameter in inches? (Round your answer to at least three decimal places.)
in.
What is the inside diameter in inches? (Round your answer to at least three decimal places.)
in.
What is the length in inches?
in.
What is the formula for the volume of a cylinder? (Use the following as necessary: h for the height and R for the radius. Do not substitute numerical values; use variables only.)
V =
What is the volume of the outer cylindrical shape in in.3?
in.3
What is the volume of the inner cavity (in in.3)?
Incorrect: Your answer is incorrect.
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. in.3
What is the volume of the tubing? (Use the following as necessary: Vouter and Vinner. Do not substitute numerical values; use variables only.)
V =
What is the volume of the tubing in in.3?
in.3
What is the volume of tubing in ft3?
Incorrect: Your answer is incorrect.
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. ft3
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