Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
3rd Edition
ISBN: 9780133593211
Author: Elizabeth A. Stephan, David R. Bowman, William J. Park, Benjamin L. Sill, Matthew W. Ohland
Publisher: PEARSON
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Textbook Question
Chapter 10.2, Problem 6CC
As part of the design of a high-performance engine, you are analyzing properties of spherical ceramic ball bearings. Since many ceramic materials are considerably less dense than the metals typically used in such applications, the centrifugal load added by the bearings can be significantly reduced by the use of ceramics.
| A | B | C | D | E | F | G | |
| 1 | |||||||
| 2 | Mass of Ball Bearings (m) [g] | ||||||
| 3 | Specific Gravity | ||||||
| 4 | Radius (r) [cm] | 3.12 | 3.18 | 3.22 | 3.31 | 3.37 | |
| 5 | 1.00 | 13.1 | 13.3 | 13.5 | 13.9 | 14.1 | |
| 6 | 1.05 | 15.1 | 15.4 | 15.6 | 16.1 | 16.3 | |
| 7 | 1.10 | 17.4 | 17.7 | 18.0 | 18.5 | 18.8 | |
| 8 | 1.15 | 19.9 | 20.3 | 20.5 | 21.1 | 21.5 | |
| 9 | 1.20 | 22.6 | 23.0 | 23.3 | 24.0 | 24.4 | |
| 10 | 1.25 | 25.5 | 26.0 | 26.3 | 27.1 | 27.6 | |
| 11 | 1.30 | 28.7 | 29.3 | 29.6 | 30.5 | 31.0 | |
Which of the following could be typed in cell B5 and copied across to cell F5, then down to cell F11 to calculate the masses of the various ball bearings shown in the table? If more than one answer is correct, indicate all that apply.
- A. = 4/3 * PI * $A5 ^ 3 * $B4
- B. = 4/3 * PI() * $A5 ^ 3 * B$4
- C. = 4/3 * PI() * $A$5 ^ 3 * $B$4
- D. = 4/3 * PI * A$5 ^ 3 * B$4
- E. = 4/3 * PI() * A5 ^ 3 * B4
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A freezer with dimensions of 4 m wide, 6 m long and 3 m high is under construction. The walls and ceiling are composed of 1.7 mm stainless steel (k = 15 W / [m ° C]), 10 cm thick foam insulation (k = 0.036 W / [m ° C]), a specific thickness of corkboard (k = 0.043 W / [m ° C]), and 1.8 cm thickness of wood (k = 0.104 W / [m ° C]). The inside of the freezer is maintained at -40 ° C. The ambient air outside the freezer is 32 ° C. The convective heat transfer coefficient is 5 W / (m K) on wooden walls and 2 W / (m² K) on stainless steel surfaces. If the outside air has a dew point of 29 ° C, calculate the thickness of the corkboard insulation that will prevent moisture condensation on the outer walls of the freezer. Calculate the heat transfer rate through the walls and ceiling of this freezer. Ignore heat transfer from floors and corners of buildings. a. Thickness of corkboard insulation = cm.
b. Heat transfer rate through walls and ceilings = watt.
A particle is subjected to the action of two forces:
F1 = 2.5 i-3j+ 6 k [kN] and F2 = 5 i+6j-5k [kN]. The magnitude of the resultant
force is:
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Select one:
Oa. FR=-8.139 [kN]
%3D
Ob. FR 8.139 [kN]
Oc. FR = 5 [kN]
Od. FR=-5 [kN]
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Chapter 10 Solutions
Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
Ch. 10.1 - Type "5" in cell E22 and "9" in cell E23; type...Ch. 10.1 - Type “20” into cell G22 and “=$G$22 + 10” in cell...Ch. 10.1 - Prob. 3CCCh. 10.1 - Type “=$A28 + 5” in cell G28. Copy cell G28 down...Ch. 10.2 - Launch a new worksheet. Type the following Excel...Ch. 10.2 - As part of the design of a high-performance...Ch. 10.3 - Evaluate the following expressions. What is the...Ch. 10.3 - Continue the example in CC 10-6 above. The...Ch. 10.4 - This is a continuation of the worksheet you...Ch. 10.5 - Prob. 11CC
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