Welding: Principles and Applications (MindTap Course List)
8th Edition
ISBN: 9781305494695
Author: Larry Jeffus
Publisher: Cengage Learning
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Chapter 4, Problem 10R
What problems can result from too long or too short of an arc length?
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The cable exerts a force of P = 4 kN at the end of the 8-m-long crane boom.
A
P
8 m
B
-x-
I'm
En
▾ Part A
If 0 = 30°, determine the placement x of the boom at B so that this force creates a maximum moment about point O.
Express your answer to three significant figures and include the appropriate units.
x = 9.81 m
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▾ Part B
What is this moment?
Express your answer to three significant figures and include the appropriate units. Assume the positive direction is
counterclockwise.
(Mo) max 43.7
=
E
?
N
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Chapter 4 Solutions
Welding: Principles and Applications (MindTap Course List)
Ch. 4 - Describe two methods of striking an arc with an...Ch. 4 - Why is it important to strike the arc only in the...Ch. 4 - What problems may result by using an electrode at...Ch. 4 - What problems may result by using an electrode at...Ch. 4 - According to Table 4-1, what would the amperage...Ch. 4 - What makes some spatter “hard?”Ch. 4 - Why should you never change the current setting...Ch. 4 - What factors should be considered when selecting...Ch. 4 - What can a welder do to control overheating of the...Ch. 4 - What problems can result from too long or too...
Ch. 4 - What arc problems can occur in deep or narrow weld...Ch. 4 - Describe the difference between using a leading...Ch. 4 - Can all electrodes be used with a leading angle?...Ch. 4 - What characteristics of the weld bead do the...Ch. 4 - What are some of the applications for the circular...Ch. 4 - Using a pencil and paper, draw two complete lines...Ch. 4 - Why is it important to find a good welding...Ch. 4 - Which electrodes would be grouped in the following...Ch. 4 - Give one advantage of using electrodes with...Ch. 4 - What are stringer beads?Ch. 4 - Describe an ideal tack weld.Ch. 4 - What effect does the root opening or root gap have...Ch. 4 - What can happen if the fillet weld on a lap joint...Ch. 4 - Which plate heats up faster on a tee joint? Why?Ch. 4 - Can a tee weld be strong if the welds on both...
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- The bevel gear shown in is subjected to the force F which is caused from contact with another gear. Part A F (201+8j 15k) N 40 mm Determine the moment of this force about the y axis of the gear shaft. Express your answer with the appropriate units. My = Value Submit Request Answer ? Units 30 mmarrow_forwardConsider the beam in. Part A 1.5 ft 200 lb 200lb 2 ft 30° 1.25 ft 30° If F 90 lb, determine the resultant couple moment. = Express your answer in pound-feet to three significant figures. Assume the positive direction is counterclockwise. ΑΣΦ vec MR = Submit Request Answer ? lb.ftarrow_forward4. An operating parameter often used by power plant engineers is the heat rate. The heat rate is defined as, HR Qbioler Wnet where Qbioler is the heat transfer rate (Btu/h) to the water in the boiler due to the combustion of a fuel and Wnet is the net power (kW) delivered by the plant. In comparison, the thermal efficiency of the power plant is defined as, nth Wnet Qbioler where the numerator and denominator have the same units. Consider a power plant that is delivering 1000 MW of power while utilizing a heat transfer rate of 3570 MW at the boiler. Determine the heat rate and thermal efficiency of this power plant.arrow_forward
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- This is a mechanics/statics problem involving finding internal reactions, V(x) and M(x). Please refer to image for details. I'm not sure about where to take cuts and how to formulate the equations as a function of x. For my support Reactions I got Ay = 1008.33 lb, By = 1416.67 lb and Cy = 175 lb. and for the first cut V(x) = 1008.33 -250(x) and M(x) = 1008.33x - 125x^2. I'm struggling with the equations for the 2nd and 3rd cut.arrow_forwardAs shown in the figure below, a ring is used to suspend a load and is supported by Cable OA and Spring OB. Given that the tension in Cable OA is 400 N, what is the weight of the load being supported? Assume the system is in static equilibrium.arrow_forward4. (a) State the conditions that must be met to ensure dynamic balance is achieved for long rotors. (b) A rotor carries three out-of-balance discs in planes A, B and C as shown in Figure 4. The out-of- balance mass x radius products of the rotor discs are tabulated in Table 4. The shaft is to be dynamically balanced by adding balancing masses in planes P and Q, spaced along the shaft at a distance da = 800 mm. Determine the magnitude mara and angular position of the balancing mass x radius product that must be added to plane Q. MBB Ов θε mdc Мага End View on Plane P P MBB MATA dA dB dc do Figure 4 moc Table 4 MATA = 0.6 kg mm 6A = 0° d₁ = 200 mm mers = 0.2 kg mm 6g = 45° dB = 400 mm mcrc = 0.4 kg mm Bc=240° dc = 600 mm Ans. (b) = 110.5°, moro = 0.2 kg mmarrow_forward
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