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Moaveni-Engineering Fundamentals 6/e (Homework)

James Finch

Engineering, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 6 / 33

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
1/1 2/9 1/1 –/3 2/2 –/3 0/3 –/1 –/4 –/3 –/3
Total
6/33 (18.2%)

  • Instructions

    Engineering Fundamentals: An Introduction to Engineering, 6th 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.

    Question 1 is a Chapter Quiz Question. Chapter Quiz Questions encourage students to test and apply what they have learned in each chapter. These questions can serve as a quick and useful self-test to help confirm understanding of each concept.

    Question 2 is an Expanded Problem. Expanded Problem questions are expanded versions of existing questions that include intermediary steps to guide the student to the final answer. This question uses length and length related variables so students can calculate the volume of materials.

    Question 3 uses approximation methods to calculate the length of an arc.

    Question 4 uses mass flow rate and volume flow rate to calculate the average density of the gas exiting an experimental jet engine.

    Question 5 uses the dimensions of two objects to determine the moment created by the weight of one of the objects about a certain point.

    Question 6 uses energy efficient ratio (EER) to calculate electrical energy and coefficient of performance (COP) for a given air-conditioning.

    Question 7 uses R-values expressed per unit thickness to calculate the thermal conductivity of an insulating material.

    Question 8 uses the WebAssign Matrix Tool that enables students to calculate a set of equations.

    Question 9 uses linear interpolation to estimate air temperatures and the corresponding speeds of sound at specific altitudes.

    Question 10 uses data so students can test the performance of tires. Using the WebAssign graphing tool students can plot the data and calculate the mean and standard deviation.

    Question 11 uses the WebAssign multi-mode approach to calculate bank interest rates and decide which alternative would be most attractive. 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. 1/1 points  |  Previous Answers MoaveniEng6 7.CQ.001. My Notes
Question Part
Points
Submissions Used
1
1/1
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1/1
 
If you were to measure the cross section of a 2 ✕ 4, you would find it to be 38 millimeters wide by 90 millimeters tall. What are the numbers "2 ✕ 4" called?
     Correct: Your answer is correct.
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2. 2/9 points  |  Previous Answers MoaveniEng6 7.4.046.EP. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7 8 9
1/1 0/1 1/1 0/1 0/1 0/1 0/1 0/1 0/1
3/50 6/50 1/50 2/50 1/50 1/50 1/50 1/50 1/50
Total
2/9
 
Consider a 130 ft long, 3
1
2
 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.)
Correct: Your answer is correct. in.
What is the inside diameter in inches? (Round your answer to at least three decimal places.)
Incorrect: Your answer is incorrect. in.
What is the length in inches?
Correct: Your answer is correct. 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 =
πR24​x h
Incorrect: Your answer is incorrect.
What is the volume of the outer cylindrical shape in in.3?
Incorrect: Your answer is incorrect. in.3
What is the volume of the inner cavity (in in.3)?
Incorrect: Your answer is incorrect. 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 =
3.33
Incorrect: Your answer is incorrect.
What is the volume of the tubing in in.3?
Incorrect: Your answer is incorrect. in.3
What is the volume of tubing in ft3?
Incorrect: Your answer is incorrect. ft3
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3. 1/1 points  |  Previous Answers MoaveniEng6 7.2.042. My Notes
Question Part
Points
Submissions Used
1
1/1
1/50
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1/1
 
Calculate the arc length
S1
 in the accompanying figure (in cm).
R2 = 12 cm,
R1 = 7 cm,
 and
S2 = 6.90 cm.
Two circular sectors, one with arc length S1 and the other with arc length S2 > S1, are formed by the same acute angle θ. The arc of length S1 has radius R1 and the arc of length S2 has radius R2 > R1.
Correct: Your answer is correct. cm
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4. –/3 points MoaveniEng6 9.3.045. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/50 0/50 0/50
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–/3
 
Air with a density of 0.45 kg/m3 enters an experimental jet engine at a rate of 170 m/s. The inlet area of the engine is 8.0 ft2. After fuel is burned, the air and combustion byproducts leave the engine with a velocity of 635 m/s through an outlet area of 7.0 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)   kg/m3 density (slugs/ft3)   slugs/ft3 density (lbm/ft3)   lbm/ft3
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5. 2/2 points  |  Previous Answers MoaveniEng6 10.3.033. My Notes
Question Part
Points
Submissions Used
1 2
1/1 1/1
1/50 1/50
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2/2
 
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 32 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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6. –/3 points MoaveniEng6 13.3.012. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/50 0/50 0/50
Total
–/3
 
An air-conditioning unit has a cooling capacity of 30,000 Btu/h. If the unit has a rated energy efficiency ratio (EER) of 15, how much electrical energy (in kWh) is consumed by the unit in 1 h?
kWh
If a power company charges 18 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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7. 0/3 points  |  Previous Answers MoaveniEng6 11.2.008. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 0/1 0/1
0/50 1/50 1/50
Total
0/3
 
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 12.5
R-32 10.0
R-24 7.5
R-19 5.9
R-13 4.1
(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
Incorrect: Your answer is incorrect. in.
(c)
R-20
Incorrect: Your answer is incorrect. in.
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8. –/1 points MoaveniEng6 18.5.021. My Notes
Question Part
Points
Submissions Used
1
–/1
0/50
Total
–/1
 
Solve the following set of equations using the Gaussian method. (If there is no solution, enter NO SOLUTION.)
111
214
−341
 
x1
x2
x3
 = 
9
20
13
(x1, x2, x3) = 
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9. –/4 points MoaveniEng6 18.2.035. My Notes
Question Part
Points
Submissions Used
1 2 3 4
–/1 –/1 –/1 –/1
0/50 0/50 0/50 0/50
Total
–/4
 
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 1,600 m and 9,000 m. (Round your answers to at least the nearest integer.)
1,600 m
air temperature K speed of sound m/s
9,000 m
air temperature K speed of sound m/s
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10. –/3 points MoaveniEng6 19.4.039. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/50 0/50 0/50
Total
–/3
 
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 18
35,000 22
40,000 35
45,000 39
50,000 27
55,000 14
Plot the data.

Calculate the mean and standard deviation (in miles).
mean mi standard deviation mi
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11. –/3 points MoaveniEng6 20.4.022. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/50 0/50 0/50
Total
–/3
 
You need to borrow $13,000 to buy a car, so you visit two banks and are given two alternatives. The first bank allows you to pay $2812.10 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 $221.64 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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