ENGINEERING DESIGN PROCESS>PRINT UPGRD<
3rd Edition
ISBN: 9780357778845
Author: HAIK
Publisher: CENGAGE L
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Chapter 4.12, Problem 6P
Draw an objective tree for the following: If you drive in the state of Florida, you may notice some traffic congestion when crews trim trees on the state roads and freeways. Assume that the Florida Department of Transportation is the client. Usually, branches 6 inches or less in diameter are trimmed. The allowable horizontal distance from the edge of the road to the branches is 6 feet. The material removed from the trees must be collected and removed from the roadside. To reduce the cost of trimming, a maximum of only two workers can be assigned for each machine. The overall cost, which includes equipment and labor must be reduced by at least 25% from present cost. The state claims that the demand for your machines will follow the price reduction—that is, if you are able to reduce the cost by 40%, the demand will increase by 40%. Allowable working hours depend on the daylight and weather conditions.
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Part A
The man pulls on the rope with a force of F = 30 N as shown in (Figure 1).
Figure
1.5 m
3 m.
4m
10.5 m
1 of 1
Determine the position vector from O to A.
Express the x, y, and z components of the position vector in meters to three significant figures separated by commas.
ΜΕ ΑΣΦ
vec
(TOA). (TOA)y. (TOA)==
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Part B
m
Determine the position vector from O to B.
Express the x, y, and z components of the position vector in meters to three significant figures separated by commas.
ΜΕ ΑΣΦ
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(TOB)x, (TOB)y, (TOB) =
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Part C Complete previous part(s)
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4
Part A
The tool is used to shut off gas valves that are difficult to access (Figure 1).
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30
0,4 m
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If the force F= {-60i+40j+15k} N is applied to the handle, determine the component of the moment created about the z axis of the valve.
Express your answer with the appropriate units.
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Units
3. A steam power plant has an average monthly net power delivery of 740 MW over the course of
a year. This power delivery is accomplished by burning coal in the boiler. The coal has a heating
value of 9150 Btu/lbm. The cost of the coal is $14.20/ton. The overall thermal efficiency of the
plant is,
nth
Wnet
Qboiler
0.26 = 26%
Determine the annual cost of the coal required to deliver the given average monthly power.
Chapter 4 Solutions
ENGINEERING DESIGN PROCESS>PRINT UPGRD<
Ch. 4.12 - Consider the following problem statement and state...Ch. 4.12 - Write down the elements of the design brief for a...Ch. 4.12 - Prob. 4PCh. 4.12 - Prob. 5PCh. 4.12 - Draw an objective tree for the following: If you...Ch. 4.12 - Prob. 7PCh. 4.12 - As technology advances and new materials are...Ch. 4.12 - Most houses have vents that open and close...Ch. 4.12 - Prob. 11PCh. 4.12 - Prob. 12P
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