The purification of hydrogen gas is possible by diffusion through a thin palladium sheet Calculate the number of kilograms of hydrogen that pass per hour (in kg/h) through a 4.6 mm thick sheet of palladium having an area of 0.25 m² at 500°C. Assume a diffusion coefficient of 6.0 x 10^-8 m^2/s, that the concentrations at the high and low-pressure sides of the plate are 5.2 and 0.32 kg/m^3 (kilogram of hydrogen per cubic meter of palladium), and that steady-state conditions have been attained.
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The number of kilograms of hydrogen that pass per hour (in kg/h) through is equal to 0.0573 kg/h.
What is Diffusion?The diffusion of material is the movement of action atoms for the region from high to low concentration. In other words, it is the transportation of material from atomic movement dependent on time.
There are different types of mechanism diffusion: interstitial diffusion and substitutional diffusion.
The diffusion can be explained by the Fick Law (Fick's 1st Law and Fick's 2nd Law). For solving you should apply Fick's 1st Law, which says:
M=JAt=[tex]-DAt\frac{ \Delta C }{\Delta X}[/tex]., where:
D= diffusion coefficientA = area t= time ΔC/ΔX = the concentration of the gradient x= thickness sheetThe exercise asks the number of kilograms of hydrogen that pass per hour (in kg/h), and it gives:
D= diffusion coefficient= 6.0 x 10^-8 m²/sA = area = 0.25 m² ΔC= 0.32 - 5.2 kg/m^3 x= [tex]4.6*10^{-3} m[/tex]Thus,
[tex]-(6.0* 10^{-8} m^2/s)*0.25 m^2*(\frac{3600*s}{h} )*(\frac{0.32-5.2 kg/m^3}{4.6*10^-3 m} )= 0,0573 \frac{kg}{h}[/tex]
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According to Bernoulli's principle, as the velocity of liquid increases, the pressure decreases.
Ventilation under the folds of the paper, therefore, increases the wind speed.
This speed increase leads to a decrease in pressure. This means that there are fewer air molecules in this space than before.
What caused the tent to collapse? Everything in nature seeks balance. If there is a place with low pressure, air will enter from a place with high pressure, and the pressure will become uniform again.
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With the lid underneath, the high-pressure overhead will cause the tent to collapse.
Why does the pressure increase as speed increases? The answer lies in the concept of conservation of energy. That is, points in the system is neither designed nor distributed and are only passed between types.
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The best designed saw for cutting miter joints is a
O handsaw
O backsaw
O coping saw
O hacksaw
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Answer:
backsaw
Explanation:
The best designed saw for cutting miter joints is a backsaw. The correct option is 2.
What is a backsaw?Any hand saw having a stiffening rib on the edge opposite the cutting edge—known as a backsaw—enables better control and more accurate cutting than other saws.
For precise tasks like cutting dovetails, mitres, or tenons in cabinetry and joinery, backsaws are typically employed in woodworking.
Its teeth have sharp, knife-like points because they are beveled on both sides, which cuts through the fibers of the wood.
The down stroke of the crosscut saw is also used to cut. The backsaw features a small, squared-off blade that is about a foot long, and to maintain the blade straight, a sheet steel reinforcing strip is wrapped over the back of the blade.
Thus, the correct option is 2.
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Your question seems incomplete, the probable complete question is:
The best designed saw for cutting miter joints is a
O handsawO backsawO coping sawO hacksawOne integrated circuit design calls for the diffusion of arsenic into silicon wafers; the background concentration of As in Si is 2.5 x 1020 atoms/m. The predeposition heat treatment is to be conducted at 1000°C for 45 minutes, with a constant surface concentration of 8x 10^26 As atoms/m³. At a drive in temperature of 1100°C, determine the diffusion time required for a junction depth of 1.21m. For this system, values of Q and Do are 4.10 eV and 2.29x10^3m/s, respectively.
Answers
The diffusion time that is needed for the junction depth of 1.21 m is given as 13875 seconds
How to solve for the diffusion timebackground concentration of As in Si is 2.5 x 10²⁰ atoms/m
tp = 1000°c
tp = 45 minutes
= 45 x 60 seconds
surface concentration = 8x 10^26
Td = 1100°c
Junction depth = 1.2
= 1.2 x 10⁻⁶m
qd = 4.10ev
Do = 2.29 x 10⁻³
We have to use the equation
[tex]Dp = Doexp(-\frac{qd}{kTP} )\\\\= (2.23 * 10^-^1^3 m^2/s) exp [-\frac{4.10}{8.62*10^-^5 *(1000+273)} ][/tex]
= 1.36 x 10⁻¹³
From the relation that we have here
[tex]Qo = 2cs\sqrt{\frac{Dpte}{pi} } \\\\= 2 * 8* 10^2^6*\sqrt{\frac{1.36*10^-^1^3(45*60)}{pi} }[/tex]
Qo = 1.73 x 10¹³
Dd at 1100
[tex]Dd = 2.29*10^-^3exp(\frac{-4.10}{8.62x10^-^5)(1100 + 273)}[/tex]
Dd = 2.06 x 10⁻¹⁸m²/s
From the relation we have
[tex]exp[\frac{(1.2 * 10^-^6)^2}{4*(2.06x10^-^1^8)+d} ]=\frac{1.73*10^1^9}{2.5x10^2^0*\sqrt{pi*2.06*10^-^1^8x+d} }[/tex]
[tex]ln\frac{2.72*10^7}{\sqrt{+d} } =\frac{1.75*10^5}{+d}[/tex]
Using heat and trial, we would have the value of +d = 13875 seconds
The diffusion time is 13875 seconds
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will model creation phase will aid in cost savings during development. true or false
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Answer:True
Explanation:
10. You should ______ when working with power tools.
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Answer:
Use of personal protective equipment
DRIVERS ED PLEASE HELP
The interactive activities in this course .
will
be tested in the final exam but not the lesson quizzes
will be scored by your instructor
will be tested in lesson quizzes but not the final exam
will not be scored
Submit answer
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Explanation:
bro don't ask people for this you will get a bad grade if the host finds that you cheated
Because he is concerned about building materials entering the marketplace that are marketed as sustainable or renewable but that aren't really any such thing, Rafael of Incipient Renewable Construction creates a consumer watchdog group to identify such products. The group rates products on a scale that indicates how reliable the green claims for the products are. He wants to force the makers and suppliers of
these materials to either be more honest about their claims or pull these products from the market. Rafael's efforts will be most effective at improving which of the following? (Select all that apply.)
O consumer confidence regarding green materials and technology
O coordination between voluntary consumer groups and government agencies
O industry knowledge regarding green building products
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Because Rafael is concerned about building materials entering the marketplace that are marketed as sustainable or renewable but that isn't really any such thing, Rafael of Incipient Renewable Construction creates a consumer watchdog group to identify such products.
Rafael's efforts which can be described as consumer advocacy will be most effective at improving:
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A Consumer Watchdog organization's responsibilities include the following:
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A wrench with a 5 inch long handle is used to install a 1/4 20 UNC bolt. Calculate the IMA.
Answer: 628.7
Please show how to get the answer.
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Answer:
Look at explanation.
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IMA= Fr/Fe
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What is the key to repairing large areas of vehicle damage?
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The key to repairing large areas of vehicle damage is option A) Break down the damage into separate repair categories.
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Note that in regards to the Metal working areas, this is said to be one that can be found or seen in the shop where the said damaged parts are known to be removed, repaired, as well as installed.
Thus, there must be a summary of what is to be done. Hence, option A is correct.
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The Construction Engineering Research Laboratory (CERL) of the Army Corps's Engineering Research and Development Center has done technology transfer work that has advanced the green building industry.
True or False
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Answer:
true
Explanation:
because it's true.. the government is the best
Which type of power system should Gavin use to create the device in the following scenario?
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A. a fluid power system similar to one used in a pool pump
B. a hydraulic system similar to one used in a dump truck
C. a propulsion system similar to one used in a jet plane
D. a pneumatic power system similar to one used in a jackhammer
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Given that Gavin is designing a device that must rely on precise movements. It must have the force to cut through metal yet be safe enough for one person to hold steady on his or her own. The type of power system should Gavin use to create the device in the following scenario is: " a fluid power system similar to one used in a pool pump" (Option A)
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Fluid power systems are classified into two types: hydraulic equipment, which use liquids such as water and oil, and pneumatic systems, which use neutral gases such as air.
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