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antiseptic1488 [7]
4 years ago
6

A resistance spot welding operation is performed on two pieces of 0.040 in thick sheet steel with unit melting energy of 150 Btu

/in3. It takes 9500 A and 0.17 sec to complete a weld nugget of φ0.190 in and 0.060 in thick.
Assume the resistance of 100 micro-ohms.a) Calculate the average power density in the interface area defined by the weld nuggetb) Find the percentage of energy generated that went into formation of the weld nugget (i.e, calculate the ratio Eweld / Esource)
Engineering
1 answer:
erma4kov [3.2K]4 years ago
8 0

Answer

The answer and procedures of the exercise are attached in the following archives.

Step-by-step explanation:

You will find the procedures, formulas or necessary explanations in the archive attached below. If you have any question ask and I will aclare your doubts kindly.  

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Under a construction management (CM) contract, should the CM firm's responsibilities normally begin at the construction phase, t
Yuki888 [10]

Answer:

Conceptual or planning design phase.

Explanation:

Construction management have following phases

Phase 1 :Conceptual or planning design phase.

Phase 2 : Engineering and design phase.

Phase 3 :Procurement phase.

Phase 4 :Execution phase.

Phase 5 :Operation and maintenance phase.

These all phases running in a proper sequence .So at the begging of construction the first phase is conceptual or planning phase.

7 0
3 years ago
A worker's hammer is accidentally dropped from the 20th floor of a building under construction. With what velocity does it strik
Illusion [34]

Answer:

Final Velocity (Vf)= 139.864 ft/s

Time (t)= 4,34 s

Explanation:

This is a free fall problem, to solve it we will apply free  fall concepts:

In a free fall the acceletarion is gravity (g) = 9,81 m/s2, if we convert it to ft/s^2 = g= 32.174 ft/s^2

  • Final velocity is Vf= Vo+ g*t[tex]Vf^{2} = Vo^{2} +2*g*h

where h is height (304 ft in this case).

Vo =0 since the hammer wasn't moving when it stared to fall

Then Vf^2= 0 + 2* 32.174 ft/s^2 *304 ft

          Vf^2= 19,561.8224  ft^2/s^2

          Vf=[sqrt{19561.8224 ft^2/s^2}

          Vf=139.864 ft/s

Time t= (Vf-Vo)/g => (139.864 ft/s-0)/32.174 ft/s^2 = 4.34 sec

Good luck!

8 0
3 years ago
Join the pad let <br><br> https://pad let.com/56021812/8g75510tedza5v2a
labwork [276]
What the brxh is a parley
7 0
3 years ago
Read 2 more answers
To convert from the U.S. Customary (FPS) system of units to the SI system of units. A first-year engineering student records thr
LenaWriter [7]

This question is incomplete, the complete question is;

To convert from the U.S. Customary (FPS) system of units to the SI system of units. A first-year engineering student records three separate measurements as 653 lb, 69.0 mi/h, and 293 × 10⁶ ft². Suppose this engineering student has to turn in the results, but the professor only accepts results given in SI units.  

Required:

What is the area measurement, 293 × 10⁶ ft², in SI units?

293 × 10⁶ ft² = ?km²

Answer:

the area measurement is  27.221 km²

Explanation:

Given the data in the question;

What is the area measurement, 293 × 10⁶ ft², in SI units

we are to the result of the measured area from ft² to km²

we know that;

1 meter = 3.2808 ft

1 km = 1000 m

1 ft = (1 / 3.2808)m

1 m = ( 1/1000 ) km

since our measured are is 293 × 10⁶ ft²

hence

A = 293 × 10⁶ × [ (1 / 3.2808)m ]²

A = 27221252.74 m²

A = 27221252.74 × [ ( 1/1000 ) km ]²

A = 27.221 km²

Therefore, the area measurement is  27.221 km²

7 0
3 years ago
Which construction material can workers erect at the fastest rate?
mina [271]

Answer:

Fabrication benefits

Explanation:

Onsite construction can certainly begin more quickly when you are using concrete, stone, or brick. However, total construction time will lag behind that of building with steel. These materials require time to prepare and cure; and they result in more waste to move off site and dispose of.

7 0
3 years ago
Read 2 more answers
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