A species A diffuses radially outwards from a sphere of radius ro. The following assumptions can be made. The mole fraction of species A at the surface of the sphere is Xao. Species A undergoes equimolar counter-diffusion with another species B. The diffusivity of A in B is denoted DAB. The total molar concentration of the system is c. The mole fraction of A at a radial distance of 10ro from the centre of the sphere is effectively zero. (b) Would one expect to see a large change in the molar flux of A if the distance at which the mole fraction had been considered to be effectively zero were located at 100ro from the centre of the sphere instead of 10ro from the centre? Explain your reasoning. [4 marks]
Answers
Assuming that species A diffuses radially outwards from a sphere of radius ro, let's find out if there would be a large change in the molar flux of A if the distance at which the mole fraction had been considered 100ro from the centre of the sphere instead of 10ro from the centre.
The condition for zero flux of A at a radial distance of 10ro from the centre of the sphere is-
D(A) dX(A)/dx = D(B) dX(B)/dx-----
Given that the mole fraction of A at the surface of the sphere is Xao, we can write
X(A) = Xao and X(B) = (1 - Xao).
Substituting these values in we have
-D(A) dX(A)/dx + D(B) dX(B)/dx = -D(A) Xao/ro + D(B) (1-Xao)/ro = 0
Solving for D(B)/D(A), we getD(B)/D(A) = ln(1/Xao)/9
Given that the mole fraction of A at a radial distance of 10ro from the centre of the sphere is effectively zero, Xao should be less than 1/e. we would not expect to see a large change in the molar flux of A if the distance at which the mole fraction had been considered to be effectively zero were located at 100ro from the centre of the sphere instead of 10ro from the centre.
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Related Questions
the hub and blades of a utility scale wind turbine from the rotor, which converts wind energy into roational energy thsat turns electric generator
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A utility-scale wind turbine's hub and blades make up the rotor, which transforms green energy into centrifugal energy that powers an electrical generator.
Describe a turbine How does it function?The blades of a turbine, which resemble propellers and function similarly to an airplane wing, capture the wind's energy. A compartment of low-pressure air develops on one edge of the blade when the wind blows. The blade is subsequently drawn toward the low-pressure air pocket, which turns the rotor.
What two types of turbines are there?Francis and Propeller reaction turbines are the two most popular varieties. Reaction turbines include kinetic turbines as well. The runner of a propeller turbine typically has three to five blades.
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A uniform plane wave traveling in a low loss material has an attenuation constant of α=0.7 (Np/m). What percentage of the incident power is dissipated in the medium after it travels a distance of 96 mm. Express your answer as a percentage to one place after the decimal. Recall that the power density of the wave is proportional to e 2az
(assuming wave is traveling in the +z-direction)
Answers
Approximately 6.6% of the incident power is dissipated in the medium after traveling a distance of 96 mm.
The attenuation constant, denoted by α, represents the rate at which a wave's power decays as it propagates through a medium. In this scenario, the given attenuation constant is α = 0.7 Np/m. To determine the percentage of incident power dissipated in the medium after traveling a distance of 96 mm, we need to calculate the power attenuation over that distance.
The power attenuation can be expressed using the formula\(P = P0 * e^(-2αz)\), where P0 is the initial power and z is the distance traveled. Plugging in the values, we have \(P = P0 * e^(-2*0.7*0.096).\)
To find the percentage of incident power dissipated, we compare the attenuated power P with the initial power P0. The dissipated power can be calculated as \(P_dissipated = P0 - P\). The percentage of dissipated power relative to the incident power is then given by\((P_dissipated / P0) * 100.\)
By performing the calculations, we find that approximately 6.6% of the incident power is dissipated in the medium after traveling a distance of 96 mm.
It is important to note that the attenuation constant varies for different materials and frequencies. Additionally, other factors such as reflection, refraction, and scattering can also contribute to power loss in real-world scenarios.
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A second-degree burn may develop bliste
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i mean i have no idea what ya saying but i will just say what goo gle said Second-degree burns are more serious because the damage extends beyond the top layer of skin. This type burn causes the skin to blister and become extremely red and sore. Some blisters pop open, giving the burn a wet or weeping appearance. Over time, thick, soft, scab-like tissue called fibrinous exudate may develop over the wound
Solve for x. −12x+13>35 Drag and drop a number or symbol into each box to correctly complete the solution. Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse. x Response area
Answers
Solving for x in the inequality results to
x < -1.83How to solve for xTo solve for x in the inequality
-12x + 13 > 35,
subtracting 13 from both sides:
-12x + 13 - 13 > 35 - 13
-12x > 22
divide both sides of the inequality by -12:
(-12x) / -12 > 22 / -12
x < -22/12
Finally, we'll simplify the expression on the right side of the inequality:
x < -1.83
So the solution is x < -1.83.
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The point at 0°, 0° is
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Which of the following occupations is the most physically dangerous?
O electrician
O Ironworker
O boilermaker
O cement mason
Answers
Answer:Ironworker
Explanation:
Their work is totally physical and lead they get hampered by lead most
Answer:
answer:ironworker
Explanation:
they can be hampered and can also get severely injured.
pls help me right now!
Answers
9514 1404 393
Answer:
A. 15 cm²
B. 15 cm²
Explanation:
A. Original FormulaThe diagram shows the values of a, b, h. Put these in the original formula to find the area.
A = 0.5(a+b)h
A = 0.5(3 +7 cm)(3 cm) = 0.5(10 cm)(3 cm) = 15 cm²
__
B. Splitting MethodThe base of each triangle is half the difference between the two base lengths.
triangle base = (7 -3)/2 = 2 . . . cm
The area of a triangle is given by the formula ...
A = 0.5bh
A = 0.5(2 cm)(3 cm) = 3 cm²
The area of the central rectangle is given by ...
A = bh
A = (3 cm)(3 cm) = 9 cm²
Then the area of the trapezium is ...
A(triangle) +A(triangle) +A(rectangle) = A(trapezium)
(3 cm²) +(3 cm²) +(9 cm²) = A(trapezium) = 15 cm²
Which characteristic would atoms of a ferromagnetic material have?A. A lack of electrons B. North and south poles C. A temporary magnetic field D. The ability to attract nonmagnetic materials
Answers
Answer:
Option B
Explanation:
Atoms of ferromagnetic materials have north and south pole but these atoms are oriented in random directions due to which they do no exhibit magnetic properties until unless they are brought into influence of any external temporary or permanent magnetic field.
Under the influence of external magnetic force, the atoms of the ferromagnetic material get oriented in a particular direction.
Hence, option B is correct
a(n) is a support system that is completely concealed in the wall and supports the load of the fixture by means of a suitable face plate and base support firmly anchored to the floor.
Answers
Carrier fitting is used to be a support system to complete secret in the wall and supports the load of the fixture by means of a suitable feature plate and base support firmly tie up to the floor.
Carrier means the term used to create a pipe, which carries a liquid or gas from its source to its destination and is laid underground, it is also used to support system. The drain in the conveyance pipe will discharge groundwater into the pipe or contaminate the environment with the product flowing in the pipe. The advantage of this is that it offers options to meet installation codes and demands while allowing flexibility to design a functional and compact plumbing drainage system.
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In beams, why is the strain energy from bending moments much bigger than the strain energy from transverse shear forces? Choose one or more of the following options.
a) The stresses due to bending moments is much more than the stresses from transverse shear.
b) The strains due to bending moments is much more than the strains from transverse shear.
c) The deformations due to bending moments is much more than the deformations from transverse shear.
Answers
Answer:
a) The stresses due to bending moments is much more than the stresses from transverse shear.
c) The deformations due to bending moments is much more than the deformations from transverse shear.
Explanation:
Strain in an object suspended is a function of the stress which the suspended body passed through. The stress which is the function of the force experienced by the body over a given area helps is straining the moment. This lead to the strain energy from bending moment being greater than the strain energy from a transverse shear force.
20. A spur gear pinion and gear shown on a drawing have a diametral pitch of 12. The pitch radius of the pinion is 1.500 inches and the gear ratio is
specified to be 1:3. On the print, you would expect the pitch diameter of the gear to be
OA. 9.00 inches.
Answers
On the print you would expect the pitch diameter of the gear to be 9.00 inches. Option A is right.
How to solve for the diameterGear ratio = 1/3
This is solved as number of teeth on pinion / teeth on gear
= Np/Ng
The pitch diameter = 1.5 x 2
= 3
Diametral pitch = 12
NP = 3 x 12 = 36
This is the teeth on piston
Ng = 3NP
Ng = 3 * 36
= 108
Hence pitch diameter = 108/12 = 9
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.
Describe a ways car manufacturers try to reduce drag and why.
Answers
Answer:
Aerodynamic drag can be reduced by altering the density of the air and the vehicle speed, but these factors are not easily controlled. Instead, to reduce drag, car manufacturers can make the height and width of the front of the car smaller. ... This shape reduces drag and the forces that try to propel the car backwards.
Answer:
Car manufacturers can make the height and width of the front of the car smaller.
Explanation:
The shape reduces drag and the forces it to propel the car backwards.
29 10 1 point According to Gate Theory, which of the following factors can make you more sensitive to pain? Placebo effects Competing signals, like rubbing your elbow Chronic stress High levels of arousal 30 1 point Patients who are allowed to self-administer morphine use less than when they receive injections from healthcare providers. True False 31 1 point What happens when people lose their sense of smell (olfaction)? They often become manic. 32 Not much. Olfaction is not a very important sense for humans. They compensate by developing an increased sensitivity to taste (gustation). They often become depressed. 1 point The different taste qualities (sweet, sour, bitter, salt, umami) each have their own area of the tongue that is most sensitive to them. True False
Answers
The statement that The different taste qualities (sweet, sour, bitter, salt, umami) each have their own area of the tongue that is most sensitive to them is False.
Gate Theory states that competing signals such as rubbing your elbow can make you more sensitive to pain. This theory suggests that physical signals such as massage, pressure, heat, or cold can block the transmission of pain messages through the spinal cord and prevent them from reaching the brain. Therefore, when people rub their elbows or apply pressure to the area, this stimulates the non-painful touch fibers and decreases the transmission of the painful stimuli.
As per the statement, patients who are allowed to self-administer morphine use less than when they receive injections from healthcare providers is True. Olfaction is a very important sense for humans, and they often become depressed when they lose their sense of smell (olfaction). The statement that The different taste qualities (sweet, sour, bitter, salt, umami) each have their own area of the tongue that is most sensitive to them is False.
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A site is underlain by a soil that has a unit weight of 118 lb/ft3. From laboratory shear strength tests that closely simulated the field conditions, the total stress parameters were measured to be C total = 250 lb/ft2 and φ total = 29°. Estimate the shear strength on a horizontal plane at a depth of 12 ft below the ground surface at this site in lbs/ sq ft
Answers
Answer: the shear strength at a depth of 12 ft is 1034.9015 lb/ft²
Explanation:
Given that;
Weight of soil r = 118 lb/ft³
stress parameter C = 250 lb/ft²
φ total = 29°
depth Z = 12 ft
The shear strength on a horizontal plane at a depth of 12ft
ζ = C + δtanφ
where δ = normal stress
normal stress δ = r × z = 118 × 12 = 1416
so
ζ = C + δtanφ
ζ = 250 + 1416(tan29°)
ζ = 250 + 1416(tan29°)
ζ = 250 + 784.9016
ζ = 1034.9015 lb/ft²
Therefore the shear strength at a depth of 12 ft is 1034.9015 lb/ft²
Complete the function Calculate Toll. Use an if statement to determine if the vehicle's weight is over 5,000 pounds.
Ex: Calculate Toll (10, 3500) yields 20.
Hint: An if statement has a closing end statement.
Answers
The given program is to determine the toll of a vehicle that is based on the weight of the vehicle.
If the weight of the vehicle is over 5000 pounds, the toll will be 10 dollars, otherwise, it will be 5 dollars. So the given program can be completed as below:def CalculateToll(axles, weight): # define the function if weight >= 5000: # check if weight is greater than 5000 return 10 else: # if the weight is less than 5000 return 5In the given program, a function named "CalculateToll" is defined that takes the parameters of axles and weight of the vehicle. Inside the function, an if statement is used to check whether the weight of the vehicle is greater than or equal to 5000 pounds. If the weight is greater than 5000 pounds, the toll of the vehicle is set to 10 dollars, otherwise, it is set to 5 dollars. Then, using the "return" statement, the value of the toll of the vehicle is returned.
Therefore, the program will check if the weight of the vehicle is greater than or equal to 5000 pounds and accordingly it will return 10 dollars as the toll if it is, otherwise, it will return 5 dollars as the toll if it is less than 5000 pounds. The above program has more than 100 words.
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It was a mistake that i put in under 13 of age can you put it for 27
Answers
Answer:
ill try to help you :)
Explanation:
The spiral grooves in a drill body are used to do all of the following except?
Answers
A smooth, flat plate of length l = 6 m and width b = 4 m is placed in water with an upstream velocity of U = 0.5 m/s. Determine the boundary layer thickness and the wall shear stress at the center and the trailing edge of the plate. Assume a laminar boundary layer
Answers
Answer:
At x = 3m , Tw = 0.0176 N/m^2
At x = 6m , Tw = 0.056 N/m^2
Explanation:
Here in this question, we are concerned with calculating the boundary layer thickness and the wall shear stress at the center and the trailing edge of the plate , assuming a laminar boundary layer.
Please check attachment for complete solution
design a 3-to-5 decoder. (you do not need to draw the circuit. instead you may simply write the logical functions for each of the 5 outputs).
Answers
A 3-to-5 decoder is a combinational circuit that takes a 3-bit input and produces a 5-bit output. The logical functions for each of the 5 outputs can be represented as follows:
Output Y0 = F(A, B, C) = A'BC'
Output Y1 = F(A, B, C) = AB'C'
Output Y2 = F(A, B, C) = AB'C
Output Y3 = F(A, B, C) = ABC'
Output Y4 = F(A, B, C) = ABC
In the above equations, A, B, and C represent the 3 input bits. The prime (') denotes the complement of a variable.
These logical functions determine the output values based on the input combination. Each output corresponds to a specific combination of the input bits. For example, when A=0, B=0, and C=0, the output Y0 will be 1, while all other outputs will be 0.
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evaluate various types of attacks and select the scenario that simulates a transitive access attack.
Answers
The scenario that simulates a transitive access attack may include an attacker who exploits a weakness in a shopping website in order to mimic an end user and obtain services from a distributor.
What is meant by a transitive access attack?A transitive access attack may be characterized as a type of misuse of trust that causes issues with securing information or control. It attempts to access a back-end server through another server.
A SQL injection attack is an example of a transitive access attack that can bypass many other security controls. For example, if system A trusts B and system B trusts C, then it is possible for system A to inadvertently trust system C, which might lead to exploitation by a nefarious operator on system C.
Therefore, an attacker exploits a weakness in a shopping website in order to mimic an end user and obtain services from a distributor representing a scenario that simulates a transitive access attack.
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in cold climates, water pipes may freeze and burst if proper precautions are not taken. In such an occurrence, the exposed part of a pipe on the ground ruptures, and water shoots up to a height z2, of 52 m. Estimate the gage pressure of water in the pipe. The gage pressure of water in the pipe is determined to be kPa..
Answers
Answer:
Gauge Pressure = 408.3 KPa
Explanation:
The pressure inside the pipe can be given in terms of the elevation, by the following formula:
P = ρgΔz
where,
P = Absolute Pressure = ?
ρ = Density of Water = 1000 kg/m³
g = acceleration due to gravity = 9.8 m/s²
Δz = elevation = 52 m
Therefore,
P = (1000 kg/m³)(9.8 m/s²)(52 m)
P = 509.6 KPa
Now, for gauge pressure:
Gauge Pressure = P - Atmospheric Pressure
Gauge Pressure = 509.6 KPa - 101.3 KPa
Gauge Pressure = 408.3 KPa
Three rolling cylinders are connected with a pure rolling contact with a speed ratio of 3 in cylinder 1 and 2, if the center distance of the cylinder 1&2 and cylinder 2&3 are 16inches & 18 respectively. Calculate the diameter and mm of each cylinder. If the velocity is 20m/s.
Answers
At a specified point on a highway, vehicles are known to arrive according to a Poisson process. Vehicles are counted in 20-second intervals, and vehicle counts are taken in 120 of these time intervals. It is noted that no cars arrive in 18 of these 120 intervals. Approximate the number of these 120 intervals in which exactly three cars arrive. Estimate the percentage of time headways that will be 10 seconds or greater and those that will be less than 6 seconds.
Answers
Under a subsection for geological hazards the buyer is encouraged to obtain an read the booklet
Answers
Answer:
Buyer is encouraged to obtain and read the booklet entitled "The Homeowners Guide to Earthquake Safety." In most cases a questionnaire within the booklet must be completed by Seller and the entire booklet given to the Buyer if the Property was built prior to 1960.
Please I need help!
I need 1,2,&3 drawn with front top and side view. Please help asap
Answers
Answer:
just do it
Explanation:
technician a says synchronizers are used to match the clutch and input shaft speeds to provide easier gear changes. technician b says a synchronizer matches gear speed with shaft speed. who is correct?
Answers
Technician B is correct.
Since, a synchronizer matches gear speed with shaft speed.It is used for shifting gears while driving. The synchronizer works like a friction clutch, decelerating or accelerating the input shaft to match the speed of the next gear.
What is a synchronizer?
A synchronizer matches the rotational speed of the desired gear to the rotational speed of the output shaft. The gears are constantly meshing.
The shift fork moves the synchronizer's sleeve to lock the spinning gear to the shaft. It makes use of a blocking ring made of brass or soft metal to make contact with the gear's dog teeth.
These brass rings are inexpensive and wear over time, becoming rounded. When the teeth appear worn or rounded, they should be replaced.
The synchronizer blocking ring functions as a clutch, speeding up or slowing down the mating gear to match the output shaft speed.
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technician a says the vat contains a carbon pile that is a variable resistor. technician b says the vat is used to check batteries, starting systems, and charging systems. who is correct?
Answers
The correct answer is both are correct technician a says the vat contains a carbon pile that is a variable resistor. technician b says the vat is used to check batteries, starting systems, and charging systems.
A resistor is an electrical component that controls or restricts how much electrical current may pass across a circuit in an electronic device. A specified voltage can be supplied via resistors to an active device like a transistor. Modern resistors are often constructed from a carbon, metal, or metal-oxide layer. In these resistors, an insulating material is wrapped in a helix around a thin film of conductive (but still resistant) material.A passive electrical component called a resistor prevents the flow of electric current by introducing resistance. They are present in practically all electrical networks and electronic circuits. Ohms () are used to measure resistance.
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Address Bus 11. What Is The Last Address In A SRAM Chip With Pins AO - A15 And DO - D7 (15 Points) E.G. 2CD4H Enter Your
Answers
The Last Address In A SRAM Chip With Pins AO - A15 And DO - D7 (15 Points) E.G. 2CD4H: Ao-A15 represent the address lines and Do-D7 represent the Data lines.
Ao-A15 represent the address lines and Do-D7 represent the Data lines.
Number of address lines=16 bits.
For last address in SRAM all 16 bits are 1's.
Last address=1111111111111111.
In hexa-decimal it is FFFF.
Thus, the Last Address In A SRAM Chip With Pins AO - A15 And DO - D7 (15 Points) E.G. 2CD4H: Ao-A15 represent the address lines and Do-D7 represent the Data lines.
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ontains 2 m3 of air at 2938c and a gage pressure of 1.4 mpa. determine the mass of air, in kg. the local atmospheric pressure is 1 a
Answers
The mass of air in the tank calculated by using the ideal gas law is 79.1 kg.
We can calculate the mass of the air in the tank using the ideal gas law. The ideal gas law states that PV = nRT, where P is the pressure of the gas, V is the volume, n is the amount of substance, R is the universal gas constant, and T is the temperature.
Rearranging the equation to solve for n, we get n = PV/RT. We can then substitute the given values to solve for n:
n = (1.4 MPa)(2 m^3)/[(8.3145 J/molK)(-93°C + 273.15 K)]
n = 79.1 kg
Therefore, the mass of air in the tank is 79.1 kg.
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Complete question:
A tank contains 2m^3 of air at -93 degree celcius and a gage pressure of 1.4MPa. Determine the mass of air in kg. The local atmospheric pressure is 1atm.
anxiety: a. is never normal. b. is common of many psychological disorders c. is identical to fear d. is a modern development, unlikely to have roots in human history
Answers
Answer:
B
Explanation:
Anxiety is very common especially nowadays but it's especially common in psychological disorders