The only statement that must be true is "The same number of tickets was sold on the fourth day and tenth day"The correct answer is option A.
The average rate of change in T(d) for the interval d=4 and d=10 is 0, which means that there is no net change in the number of tickets sold during that interval.
This eliminates options B and D, as both suggest that there was a change in the number of tickets sold on either the fourth day or the tenth day.
Option C also cannot be true because it implies that there was a decrease in the number of tickets sold from the fourth day to the tenth day, which contradicts the fact that the average rate of change is 0.
Therefore, the only statement that must be true is:
A. The same number of tickets was sold on the fourth day and tenth day.
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The Probable question may be:
T(d) is a function that relates the number of tickets sold for a movie to the number of days since the movie was released. The average rate of change in T(d) for the interval d=4 and d=10 is 0. Which statement must be true?
A. The same number of tickets was sold on the fourth day and tenth day.
B. No tickets were sold on the fourth day and tenth day.
C. Fewer tickets were sold on the fourth day than on the tenth day.
D. More tickets were sold on the fourth day than on the tenth day.
Answer:
A
Step-by-step explanation:
A 25.00 mL sample containing BaCl2 was diluted to 500 mL. Aliquots of 50.00 mL of this solution were analyzed using Mohr and Volhard methods. The following data were obtained:
Volhard method:
Volume of AgNO3 = 50.00 mL
Volume of KSCN = 17.25 mL
Mohr method:
Volume of AgNO3 (sample titration) = 26.90 mL
Volume of AgNO3 (blank titration) = 0.20 mL
Calculate % BaCl2 using Mohr method and using Volhard method.
The percentage of Ba[tex]Cl_2[/tex] in the original 25.00 mL sample is approximately 0.1068% using the Mohr method and 0.1310% using the Volhard method.
We have,
To calculate the percentage of Ba[tex]Cl_2[/tex] using the Mohr and Volhard methods, we need to determine the amount of Ba[tex]Cl_2[/tex] present in the aliquots analyzed and then calculate the percentage based on the original 25.00 mL sample.
First, let's calculate the amount of Ba[tex]Cl_2[/tex] reacted in each method:
Mohr method:
Volume of AgN[tex]O_3[/tex] used in the sample titration = 26.90 mL
Volume of AgN[tex]O_3[/tex] used in the blank titration = 0.20 mL
The difference between these two volumes represents the volume of Ag[tex]NO_3[/tex] that reacted with Ba[tex]Cl_2[/tex] in the sample titration:
Volume of AgN[tex]O_3[/tex] reacted = 26.90 mL - 0.20 mL = 26.70 mL
Volhard method:
Volume of AgN[tex]O_3[/tex] used = 50.00 mL
Volume of KSCN used = 17.25 mL
To determine the volume of AgN[tex]O_3[/tex] that reacted with BaC[tex]l_2[/tex] in the Volhard method, we need to subtract the volume of KSCN used from the volume of AgN[tex]O_3[/tex] used:
Volume of AgN[tex]O_3[/tex] reacted = 50.00 mL - 17.25 mL = 32.75 mL
Next, we can calculate the number of moles of BaC[tex]l_2[/tex] reacted in each method:
Molar mass of BaC[tex]l_2[/tex] = atomic mass of Ba + (2 * atomic mass of Cl)
= 137.33 g/mol + (2 * 35.45 g/mol) = 208.23 g/mol
Mohr method:
Number of moles of Ba[tex]Cl_2[/tex] = (Volume of AgN[tex]O_3[/tex] reacted / 1000) * Molarity of AgN[tex]O_3[/tex]
Assuming the molarity of AgN[tex]O_3[/tex] is 1.0 M, we can calculate:
Number of moles of BaC[tex]l_2[/tex] = (26.70 mL / 1000) * 1.0 M = 0.02670 mol
Volhard method:
Number of moles of BaC[tex]l_2[/tex] = (Volume of AgN[tex]0_3[/tex] reacted / 1000) * Molarity of AgN[tex]O_3[/tex]
Again assuming the molarity of AgN[tex]O_3[/tex] is 1.0 M:
Number of moles of BaC[tex]l_2[/tex] = (32.75 mL / 1000) * 1.0 M = 0.03275 mol
Finally, we can calculate the percentage of BaC[tex]l_2[/tex] in the original 25.00 mL sample for each method:
Mohr method:
% BaC[tex]l_2[/tex] = (Number of moles of BaC[tex]l_2[/tex] Volume of original sample) * 100
% BaC[tex]l_2[/tex] = (0.02670 mol / 25.00 mL) * 100 = 0.1068% (rounded to four decimal places)
Volhard method:
% BaC[tex]l_2[/tex] = (Number of moles of BaC[tex]l_2[/tex] / Volume of original sample) * 100
% BaC[tex]l_2[/tex] = (0.03275 mol / 25.00 mL) * 100 = 0.1310% (rounded to four decimal places)
Therefore,
The percentage of BaC[tex]l_2[/tex] in the original 25.00 mL sample is approximately 0.1068% using the Mohr method and 0.1310% using the Volhard method.
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The Hayflick limit is the limit telomeres can be shorten. Please explain and provide detail on how/why telomeres get shorten? Are telomeres able to be recreated? If so how and where would we find this?
Telomeres, which protect chromosome ends, shorten with each cell division due to the limitations of DNA replication, but can be partially replenished by telomerase in certain cell types, while their length and telomerase activity have implications for aging and disease.
The Hayflick limit refers to the maximum number of times a normal human cell can divide before reaching a state of replicative senescence or cell death. It was discovered by Leonard Hayflick in the 1960s and is associated with the shortening of telomeres.
Telomeres are repetitive DNA sequences located at the ends of chromosomes. Their primary function is to protect the genetic material of the chromosome from degradation and prevent the loss of essential genes during DNA replication. However, with each cell division, the telomeres progressively shorten.
Telomere shortening occurs due to the inherent limitations of DNA replication. The DNA replication machinery is unable to fully replicate the very ends of linear chromosomes, leading to the loss of a small portion of telomeric DNA with each round of cell division. This process is known as the "end replication problem."
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Which statement is true about the diagram?
∠DEF is a right angle.
m∠DEA = m∠FEC
∠BEA ≅ ∠BEC
Ray E B bisects ∠AEF.
The only statement that is true about the diagram is "Ray EB bisects ∠AEF."
Based on the given diagram, we can analyze the statements and determine which one is true.
∠DEF is a right angle: We cannot determine whether ∠DEF is a right angle based solely on the given information. The diagram does not provide any specific angle measurements or information about the angles.
m∠DEA = m∠FEC: We cannot determine whether m∠DEA is equal to m∠FEC based solely on the given information. The diagram does not provide any angle measurements or information about the angles.
∠BEA ≅ ∠BEC: We cannot determine whether ∠BEA is congruent to ∠BEC based solely on the given information. The diagram does not provide any angle measurements or information about the angles.
Ray EB bisects ∠AEF: From the given diagram, we can see that Ray EB divides ∠AEF into two congruent angles, ∠DEA and ∠FEC. Therefore, the statement "Ray EB bisects ∠AEF" is true.
Thus, the diagram's sole true assertion is that "Ray EB bisects AEF."
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Answer:
Step-by-step explanation:
its d
Use the References to access important values if needed for this question. The following information is given for aluminum, Al, at 1 atm: Bolling point =2467.0∘C Heat of vaporization =2.52×10^3cal/g Melting point =660.0 ∘C Heat of fusion =95.2cal/g How many kcal of energy must be removed from a 37.7 g sample of liquid aluminum in order to freeze it at its normal melting point of 660.0 ∘C ? Energy removed =
3.584 kcal of energy must be removed from the 37.7 g sample of liquid aluminum to freeze it at its normal melting point of 660.0 °C.
The amount of energy needed to transform a substance from a solid to a liquid at its melting point is known as the heat of fusion.
In this case, the heat of fusion for aluminum is given as 95.2 cal/g.
and, the mass of the sample is 37.7 g.
Now, use the formula:
Energy removed = Heat of fusion × Mass
= 95.2 cal/g × 37.7 g
= 3584.24 cal
Since 1 kcal (kilocalorie) is equal to 1000 cal.
So, Energy removed = 3584.24 cal ÷ 1000
= 3.584 kcal
So, 3.584 kcal of energy must be removed.
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For reasons of comparison, a profossor wants to rescale the scores on a set of test papers so that the maximum score is stiil 100 but the average is 63 instead of 54 . (a) Find a linear equation that will do this, [Hint: You want 54 to become 63 and 100 to remain 100 . Consider the points ( 54,63) and (100,100) and more, generally, ( x, ). where x is the old score and y is the new score. Find the slope and use a point-stope form. Express y in terms of x.] (b) If 60 on the new scale is the lowest passing score, what was the lowest passing score on the original scale?
The equation that passes through these two points is y = (37/46)x + 585/23. The slope of the line is 37 / 46.The lowest passing score on the original scale was 6.
To find a linear equation to rescale the scores, we are supposed to consider the points (54, 63) and (100, 100) so that y-axis will represent new scores and x-axis will represent old scores. Here, we want to change 54 into 63 and 100 into 100. So, we need to find a linear equation that passes through the two given points.
Let's use point-slope form of a line :y - y₁ = m(x - x₁),where m = slope of the line and (x₁, y₁) = given point,
(m) = (y₂ - y₁) / (x₂ - x₁),
m = (100 - 63) / (100 - 54),
m = 37 / 46.
Thus, the slope of the line is 37 / 46.
Now, using point-slope form of the line, we get:
y - 63 = (37 / 46)(x - 54),
y = (37/46)x + 585 / 23.
If 60 on the new scale is the lowest passing score, we need to find the lowest passing score on the original scale.We are given the linear equation obtained :
y = (37/46)x + 585 / 23.
Here, we want to find the value of x when y = 60.
y = (37/46)x + 585 / 23
60 = (37/46)x + 585 / 23
(37/46)x = 60 - 585 / 23
(37/46)x = 117 / 23
x = 6.
The lowest passing score on the original scale was 6.
To find a linear equation to rescale the scores, we are supposed to consider the points (54, 63) and (100, 100) so that y-axis will represent new scores and x-axis will represent old scores.
Here, we want to change 54 into 63 and 100 into 100. So, we need to find a linear equation that passes through the two given points.
The equation that passes through these two points is
y − 63 = (37/46)(x − 54) ,
y = (37/46)x + 585/23.
If 60 on the new scale is the lowest passing score, we need to find the lowest passing score on the original scale.
Using the linear equation obtained in , we can substitute 60 for y and solve for x.
60 = (37/46)x + 585/23
(37/46)x = 117/23
x = 6. Therefore, the lowest passing score on the original scale was 6.
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abutake the ellapping slight clistance on a other As que IRC. a desending repclient at Turime for a clesige squel pe highsmy ab
The ellapping slight clistance on another IRC is a descending repclient at Turime for a clesige squel pe highsmy ab. Here's an explanation of the topic in a simplified manner:
The concept of "ellapping slight clistance" refers to the overlapping slight distance, indicating a small amount of overlap between two objects or entities.IRC stands for Internet Relay Chat, which is a protocol for real-time text messaging and communication over the internet.A "descending repclient" implies a client or user who is decreasing their reputation or status within the IRC community.Turime is not a recognized term or reference, so it's unclear what it represents in this context."Clesige squel pe highsmy ab" is not a coherent phrase or known concept, making it difficult to provide a specific explanation.The given statement lacks clarity and contains ambiguous terms, making it challenging to provide a precise and meaningful response. It would be helpful to provide more context or clarify the specific terms or concepts used in the question to provide a more accurate explanation or answer.
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Choose each correct coordinate for the vertices of A’B’C
Need asap
The correct coordinates for the vertices of triangle A' * B' * C' are:
A' * (-10, 20)
B' * (-20, -30)
C' * (20, -20)
To determine the vertices of triangle A' * B' * C', which is obtained from a transformation of triangle ABC, we need to apply the given transformation to each vertex of triangle ABC. The transformation involves scaling, translating, and rotating the original triangle.
Given:
Triangle ABC with vertices:
A(-4, 6)
B(-6, -4)
C(2, -2)
Transformation:
Dilatation: Scale factor of 5
Translation: Move 2 units to the right and 2 units down
Let's apply the transformation to each vertex:
1. Vertex A:
Applying the translation, A' = A + (2, -2) = (-4, 6) + (2, -2) = (-2, 4)
Applying the dilatation, A' = 5 * (-2, 4) = (-10, 20)
2. Vertex B:
Applying the translation, B' = B + (2, -2) = (-6, -4) + (2, -2) = (-4, -6)
Applying the dilatation, B' = 5 * (-4, -6) = (-20, -30)
3. Vertex C:
Applying the translation, C' = C + (2, -2) = (2, -2) + (2, -2) = (4, -4)
Applying the dilatation, C' = 5 * (4, -4) = (20, -20)
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Find 50 consecutive numbers, noneof which is prime. Give a detailed proof of this. [Hint: Consider factorials]
we have shown that n!+2, n!+3, ..., n!+51 are consecutive numbers, none of which are prime. In fact, we have shown that for any positive integer n, there are at least 50 consecutive composite numbers starting with n!+2.
Let's suppose that n!+2, n!+3, ..., n!+51 are consecutive numbers, none of which are prime.
We will show that these are the required consecutive numbers.
First of all, notice that n!+2 is even for n > 1 and is thus not prime, so we know that n!+2 is composite for all n > 1. Moreover, n!+3, n!+4, ..., n!+n are all composite as well, because n!+k is divisible by k for k = 3, 4, ..., n.
Now, for k = n+1, n!+k = n!(n+1)+1 is not divisible by any integer between 2 and n, inclusive, so it is either prime or composite with a prime factor greater than n.
But we have assumed that none of the consecutive numbers n!+2, n!+3, ..., n!+51 are prime, so it must be composite with a prime factor greater than n.
Hence, we have shown that n!+2, n!+3, ..., n!+51 are consecutive numbers, none of which are prime.
In fact, we have shown that for any positive integer n, there are at least 50 consecutive composite numbers starting with n!+2.
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Solve 2(x+3)=-4(x + 1) for x.
Answer:
The answer is x = [tex]\frac{-5}{3}[/tex].
Step-by-step explanation:
First, we expand the brackets. Therefore:
[tex]2x+6 = -4x+(-4)[/tex]
[tex]2x+6 = -4x -4[/tex]
Then, we separate the like terms:
[tex]2x+4x = -4-6[/tex]
Then we add the like terms up and solve for x:
[tex]6x = -10[/tex]
Therefore:
[tex]x = \frac{-10}{6}[/tex]
which, simplified, is:
[tex]x = \frac{-5}{3}[/tex].
59. HBr is a strong acid. What is the pH of a solution that is made by dissolving 450mg of HBr in enough water to make 100 mL of solution? 60. What is the concentration of a nitric acid solution if a 10.00 mL sample of the acid requires 31.25 mL of 0.135MKOH for neutralization?
59. The pH of the HBr solution is approximately 1.26.
60. The concentration of the nitric acid (HNO₃) solution is 0.422 M.
To determine the pH of a solution of HBr, we need to calculate the concentration of HBr in moles per liter (Molarity). Given the mass of HBr (450 mg) and the volume of the solution (100 mL), we can follow these steps:
Convert the mass of HBr to moles.
The molar mass of HBr is:
H: 1.01 g/mol
Br: 79.90 g/mol
Mass of HBr = 450 mg = 0.450 g
Moles of HBr = Mass of HBr / Molar mass of HBr
= 0.450 g / 80.91 g/mol
≈ 0.00555 mol
Convert the volume to liters.
Volume of solution = 100 mL = 0.100 L
Calculate the molarity (concentration).
Molarity (M) = Moles of solute / Volume of solution (in liters)
= 0.00555 mol / 0.100 L
= 0.0555 M
Calculate the pH.
Since HBr is a strong acid, it will fully dissociate in water to release H+ ions. Thus, the concentration of H+ ions is equal to the molarity of HBr.
pH = -log[H+]
pH = -log(0.0555)
pH ≈ 1.26
Therefore, the pH of the HBr solution is approximately 1.26.
To determine the concentration of the nitric acid (HNO₃) solution, we can use the balanced equation for the neutralization reaction between HNO₃ and KOH:
HNO₃ + KOH -> KNO₃ + H₂O
From the balanced equation, we know that the mole ratio between HNO₃ and KOH is 1:1. Using this information, we can calculate the concentration of HNO₃.
Volume of HNO₃ solution = 10.00 mL = 0.01000 L
Volume of KOH solution (used for neutralization) = 31.25 mL = 0.03125 L
Molarity of KOH solution = 0.135 M
From the equation, we know that the mole ratio between HNO₃ and KOH is 1:1. Therefore, the moles of KOH used in the neutralization reaction are:
Moles of KOH = Molarity of KOH * Volume of KOH solution
= 0.135 M * 0.03125 L
= 0.00422 mol
Since the mole ratio is 1:1, the moles of HNO₃ in the sample are also 0.00422 mol.
Now, we can calculate the concentration of HNO₃:
Concentration of HNO₃ = Moles of HNO₃ / Volume of HNO₃ solution
= 0.00422 mol / 0.01000 L
= 0.422 M
Therefore, the concentration of the nitric acid (HNO₃) solution is 0.422 M.
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The total cost function for a product is C(x) = 875 In(x + 10) + 1600 where x is the number of units produced. (a) Find the total cost of producing 200 units. (Round your answer to the nearest cent.) (b) Producing how many units will give total costs of $8500? (Round your answer to the nearest whole number.) _____units
(a) The total cost of producing 200 units is approximately $6103.53.
(b) Producing approximately 2641 units will result in total costs of $8500.
(a) To find the total cost of producing 200 units, we can substitute x = 200 into the cost function C(x) = 875 ln(x + 10) + 1600 and evaluate it.
C(200) = 875 ln(200 + 10) + 1600
C(200) ≈ 875 ln(210) + 1600
C(200) ≈ 875 × 5.347 + 1600
C(200) ≈ 4503.525 + 1600
C(200) ≈ 6103.525
Therefore, the total cost of producing 200 units is approximately $6103.53.
(b) To find the number of units that will result in total costs of $8500, we can set the cost function equal to $8500 and solve for x.
875 ln(x + 10) + 1600 = 8500
875 ln(x + 10) = 8500 - 1600
875 ln(x + 10) = 6900
Next, we can divide both sides of the equation by 875 and take the exponential of both sides to eliminate the natural logarithm:
ln(x + 10) = 6900 / 875
ln(x + 10) ≈ 7.8857
Taking the exponential:
e^(ln(x + 10)) ≈ e^7.8857
x + 10 ≈ 2650.579
x ≈ 2640.579
Rounding to the nearest whole number, producing approximately 2641 units will result in total costs of $8500.
Therefore, producing approximately 2641 units will give total costs of $8500.
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QUESTION 04 The void space in a sand taken near a river consists of 80% air and 20% water. The dry unit weight is yd=95 KN/m³ and Gs=2.7. Determine the water content.
The water content of the sand near a river is 18 percent.
Given that,
Void space in the sand near a river: 80% air and 20% water
Dry unit weight of the sand (yd): 95 KN/m³
The specific gravity of the sand (Gs): 2.7
To determine the water content, we can use the relationship between void ratio (e), porosity (n), and water content (w).
The formulas are as follows:
e = Vv / Vs
Where e is the void ratio,
Vv is the volume of voids, and
Vs is the volume of solids
n = e / (1 + e)
Where n is the porosity
w = (n × Gs)/(1 + Gs)
Where w is the water content
Given that the void space consists of 20% water, we can calculate the porosity:
n = 0.2 / (1 - 0.2) = 0.25
Next, we can substitute the porosity and specific gravity into the water content formula:
w = (0.25 × 2.7) / (1 + 2.7) ≈ 0.18
Therefore, the water content of the sand is 18%.
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The best hydraulic cross section for a rectangular open channel is one whose fluid height is (a) half, (b) twice, (c) equal to, or (d) one-third the channel width. Prove your answer mathematically.
The best hydraulic cross section for a rectangular open channel is one whose fluid height is equal to half the channel width (a). To prove this mathematically, we can use Manning's equation, which relates the channel flow rate to the hydraulic radius, slope, and Manning's roughness coefficient.
The equation is as follows: Q = (1/n) * A * R^(2/3) * S^(1/2), where Q is the flow rate, n is the Manning's roughness coefficient, A is the cross-sectional area of the flow, R is the hydraulic radius, and S is the slope of the channel.
For a rectangular channel, the cross-sectional area is A = b * y, where b is the channel width and y is the fluid height. The hydraulic radius is R = A / P, where P is the wetted perimeter.
Now, let's compare the hydraulic radius for different fluid heights:
- For y = b/2 (half the channel width), the hydraulic radius R = (b/2) / (2 * (b/2)) = 1/2.
- For y = 2b (twice the channel width), the hydraulic radius R = (2b) / (2 * 2b) = 1/2.
- For y = b (equal to the channel width), the hydraulic radius R = b / (2 * b) = 1/2.
- For y = b/3 (one-third the channel width), the hydraulic radius R = (b/3) / (2 * (4b/3)) = 1/6.
As we can see, the hydraulic radius is largest when the fluid height is equal to half the channel width. Therefore, (a) half the channel width is the best hydraulic cross section for a rectangular open channel.
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When we use the term ideal fluid, we neglect: O density O pressure O energy conservation O friction and we assume laminar flow
When using the term ideal fluid, the assumption of neglecting friction is made. Frictional forces are not considered in ideal fluid analysis, while other factors such as density, pressure, energy conservation, and laminar flow are still accounted for.
An ideal fluid is a theoretical concept used in fluid mechanics to simplify the analysis of fluid flow. When considering an ideal fluid, certain assumptions are made to simplify the equations and calculations involved. These assumptions include neglecting friction.
Friction is the resistance encountered by a fluid when it flows over a surface or through a pipe. In real-world scenarios, frictional forces play a significant role in fluid flow, causing energy losses and affecting the behavior of the fluid. However, when dealing with ideal fluids, friction is ignored to simplify the analysis.
Other options listed in the question:
- Density: In ideal fluid analysis, density is not neglected. The density of the fluid is still considered and can affect the calculations.
- Pressure: In ideal fluid analysis, pressure is also considered and plays a role in determining the fluid behavior.
- Energy conservation: Energy conservation is still a fundamental principle in fluid mechanics, even when dealing with ideal fluids. It is not neglected.
- Laminar flow: The assumption of laminar flow is often made when analyzing ideal fluids. Laminar flow refers to smooth, orderly flow without turbulence. It is one of the simplifying assumptions used in ideal fluid analysis.
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10 Convert the following units from Sl to Imperial: a) 34cm to inches b) 22 litres to gallons c) 70 kilometres to miles d) 78 kilograms to pounds e) 144 square metres to square yards f) 56 metres to feet and yards Convert the following units from Imperial to Sl: 17 | Page a) 16 ounces to grams b) 34 yards to meters c) 6.5 gallons to liters d) 487 feet to meters e) 19 acres to hectares f) 56 tons to kilograms g) 45 inches to centimeters h) 321 cubic inches to cubic meters i) 1092 miles to kilometers j) 12 pounds to kilograms 1 2 1 Dot 3 Dots 6 Dots 10 Dots 15 Dots 2. Write down the sequence of the numbers of dots. Work out the next three terms and explain in words how you got the answer. A 44mm B 60mm D 44mm 80mm 15 Draw the following two-dimensional shapes and transform them to three dimensional shapes by adding a height or 10 depth of 3cm a) Square with dimensions 250mm. b) Rectangle with dimensions 300mm by 200mm. c) Right-angled triangle with an adjacent side of 3cm and an opposite side of 2cm. d) Circle with a diameter of 400mm. e) Semi-circle with a radius of 1cm.
a) 34 cm = 13.39 inches
b) 22 liters = 4.84 gallons
c) 70 kilometers = 43.5 miles
d) 78 kilograms = 171.96 pounds
e) 144 square meters = 172.8 square yards
f) 56 meters = 183.73 feet and 61.02 yards
To convert centimeters to inches, we use the conversion factor of 1 inch = 2.54 cm. Thus, 34 cm divided by 2.54 gives us 13.39 inches. To convert liters to gallons, we use the conversion factor of 1 gallon = 3.78541 liters. So, dividing 22 liters by 3.78541 gives us approximately 4.84 gallons.To convert kilometers to miles, we use the conversion factor of 1 mile = 1.60934 kilometers. Therefore, dividing 70 kilometers by 1.60934 gives us approximately 43.5 miles.To convert kilograms to pounds, we use the conversion factor of 1 kilogram = 2.20462 pounds. So, multiplying 78 kilograms by 2.20462 gives us approximately 171.96 pounds. To convert square meters to square yards, we use the conversion factor of 1 square yard = 0.836127 square meters. Thus, dividing 144 square meters by 0.836127 gives us approximately 172.8 square yards.To convert meters to feet and yards, we use the conversion factor of 1 meter = 3.28084 feet. Therefore, multiplying 56 meters by 3.28084 gives us approximately 183.73 feet. To convert feet to yards, we divide by 3, so 183.73 feet divided by 3 gives us approximately 61.02 yards.Learn more about Conversions
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Write the design equations for A→Products steady state reaction for fixed bed catalytic reactor. Write all the mass and energy balances.
Catalytic fixed-bed reactors are commonly used in the chemical industry for the production of chemicals, petroleum products, and other materials.
These reactors work by allowing a reactant gas to flow through a bed of solid catalyst particles, which cause the reaction to occur. The reaction products flow out of the reactor and are collected for further processing.
The design equations for a steady-state reaction in a fixed bed catalytic reactor are based on the principles of mass and energy balance. Here are the design equations for this type of reactor:
Mass balance:For the reactant, the mass balance equation is: (1) 0 = + + where:F0 = molar flow rate of reactant at inletF = molar flow rate of reactant at outletFs = molar flow rate of reactant absorbed by catalyst particlesFi = molar flow rate of reactant lost due to reaction.
For the products, the mass balance equation is:
(2) (0 − ) = ( − ) + where:Yi = mole fraction of component i in the inlet feedY = mole fraction of component i in the outlet productYs = mole fraction of component i in the catalystEnergy balance:
For a fixed-bed catalytic reactor, the energy balance equation is: (3) = ∆ℎ0 − ∆ℎ + + where:W = net work done by the reactor∆Hr = enthalpy change of reactionF0 = molar flow rate of reactant at inletF = molar flow rate of reactant at outletWs = work done by the catalystQ = heat transfer rate.
Fixed-bed catalytic reactors are widely used in the chemical industry to produce chemicals, petroleum products, and other materials. The reaction process occurs when a reactant gas flows through a solid catalyst bed. A steady-state reaction can be designed by mass and energy balance principles.
This type of reactor's design equations are based on mass and energy balance. Mass and energy balances are critical to the design of a reactor because they ensure that the reaction is efficient and safe. For the reactant, the mass balance equation is F0=F+Fs+Fi where F0 is the molar flow rate of the reactant at the inlet, F is the molar flow rate of the reactant at the outlet, Fs is the molar flow rate of the reactant absorbed by catalyst particles, and Fi is the molar flow rate of the reactant lost due to reaction.
For the products, the mass balance equation is Yi(F0−Fi)=Y(F−Fs)+YsFs, where Yi is the mole fraction of component i in the inlet feed, Y is the mole fraction of component i in the outlet product, and Ys is the mole fraction of component i in the catalyst.
The energy balance equation is
[tex]W=ΔHradialF0−ΔHradialF+Ws+Q[/tex],
where W is the net work done by the reactor, ΔHr is the enthalpy change of reaction, F0 is the molar flow rate of reactant at the inlet, F is the molar flow rate of reactant at the outlet, Ws is the work done by the catalyst, and Q is the heat transfer rate.
Mass and energy balances are crucial when designing a fixed-bed catalytic reactor, ensuring that the reaction is efficient and safe.
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1. Two Points A (-2, -1) and B (8, 5) are given. If C is a point on the y-axis such that AC=BC, then the coordinates of C is: A. (3,2) B. (0, 2) C. (0,7) D. (4,2)
The coordinates of point C, where AC=BC, are (0, 7).
To find the coordinates of point C, we need to consider that AC is equal to BC. Point A has coordinates (-2, -1), and point B has coordinates (8, 5). We can start by calculating the distance between A and B using the distance formula:
Distance AB = sqrt((x2 - x1)^2 + (y2 - y1)^2)
Plugging in the values, we get:
Distance AB = sqrt((8 - (-2))^2 + (5 - (-1))^2) = sqrt(10^2 + 6^2) = sqrt(100 + 36) = sqrt(136)
Since AC = BC, the distance from point A to point C is the same as the distance from point B to point C. Let's assume the coordinates of point C are (0, y) since it lies on the y-axis. Using the distance formula, we can calculate the distance AC and BC:
Distance AC = sqrt((-2 - 0)^2 + (-1 - y)^2) = sqrt(4 + (1 + y)^2) = sqrt(4 + (1 + y)^2)
Distance BC = sqrt((8 - 0)^2 + (5 - y)^2) = sqrt(64 + (5 - y)^2) = sqrt(64 + (5 - y)^2)
Setting the two distances equal to each other and simplifying, we have:
sqrt(4 + (1 + y)^2) = sqrt(64 + (5 - y)^2)
Squaring both sides and solving for y, we get y = 7. Thus, the coordinates of point C are (0, 7).
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Which isomer of C5H12 would be the best
fuel? Why?
__________________________________________________________________
Explain how 1,2-dimethyl-cyclopropene can form geometric
isomers.
___________
The best fuel among the isomers of C5H12 would be 2,2-dimethylbutane due to its high octane rating and favorable combustion properties.
2,2-dimethylbutane, one of the isomers of C5H12, is the best fuel for several reasons. Firstly, it possesses a high octane rating, which measures a fuel's resistance to knocking in internal combustion engines. Higher octane fuels are less prone to premature combustion, ensuring a smoother and more efficient engine operation.
2,2-dimethylbutane's branched structure and symmetrical arrangement of methyl groups contribute to its high octane rating, making it a desirable choice for fuel.
Additionally, 2,2-dimethylbutane exhibits favorable combustion properties. Its compact and symmetrical structure allows for efficient vaporization and mixing with air, promoting thorough combustion. This results in a higher energy release during combustion, leading to increased power output in engines.
Furthermore, the branching of the carbon chain in 2,2-dimethylbutane reduces the likelihood of carbon chain reactions, minimizing the formation of harmful emissions such as carbon monoxide and nitrogen oxides.
In comparison to other isomers of C5H12, such as n-pentane and iso-pentane, 2,2-dimethylbutane offers superior performance as a fuel due to its higher octane rating and improved combustion characteristics. These properties make it an ideal choice for applications where efficient and clean combustion is crucial, such as in automobile engines.
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in some cases the metal ceramic (PFM) can cause various
problem like
A.Gum staining
B.all answer are correct
C.release of metallic ions into the gingival tissue
D.allergies
Metal ceramic (PFM) restorations can cause various problems including gum staining, release of metallic ions into the gingival tissue, and allergies in some cases.
Gum Staining: The metal portion of the restoration may become exposed over time due to wear, chipping, or gum recession. This exposure can cause visible gum staining, leading to aesthetic concerns.
Release of Metallic Ions: Metal components in PFM restorations, such as alloys containing base metals like nickel, chromium, or cobalt, can gradually release metallic ions into the surrounding oral tissues. This process, known as metal ion leaching, occurs due to corrosion or interaction with saliva and oral fluids. The release of these ions may cause localized tissue reactions or sensitivity in some individuals.
Allergies: Some individuals may develop allergic reactions or hypersensitivity to the metals used in PFM restorations. Allergies can manifest as oral discomfort, inflammation, or allergic contact dermatitis in the surrounding tissues.
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pls answer asap pls i will upvote
A 6-m simply supported beam with an overhang of 1.5 m carries a uniform distributed load of 24 kN/m. Calculate the maximum positive moment (kN-m) within the beam.
The maximum positive moment within the beam is 18 kN-m within the span and 54 kN-m at the end of the overhang.
To calculate the maximum positive moment within the beam, we need to consider two sections: one within the span and one at the end of the overhang.
Within the span:
The maximum positive moment within the span occurs at the support (simply supported beam). The formula to calculate the maximum moment at the support due to a uniform distributed load is:
M_max = (wL^2)/8
Where:
M_max is the maximum moment
w is the distributed load per unit length (24 kN/m)
L is the length of the span (6 m)
Plugging in the values:
M_max = (24 kN/m * 6 m^2) / 8
M_max = 144 kN-m / 8
M_max = 18 kN-m
Therefore, the maximum positive moment within the span is 18 kN-m.
At the end of the overhang:
The maximum positive moment occurs at the end of the overhang due to the concentrated load from the overhang. The formula to calculate the maximum moment at the end of the overhang due to a concentrated load is:
M_max = P * a
Where:
M_max is the maximum moment
P is the concentrated load (24 kN/m * 1.5 m = 36 kN)
a is the distance from the support to the point of maximum moment (1.5 m)
Plugging in the values:
M_max = 36 kN * 1.5 m
M_max = 54 kN-m
Therefore, the maximum positive moment at the end of the overhang is 54 kN-m. In summary, the maximum positive moment within the beam is 18 kN-m within the span and 54 kN-m at the end of the overhang.
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Arrange the following sets of compounds in relative order of increasing boiling point temperature and explain how you determined the order. Be specific and clear with respect to which is lowest to highest in your sequence.
O2, NO, N2
The compounds can be arranged in order of increasing boiling point temperature as follows:
O2 < N2 < NO
To determine the relative order of increasing boiling point temperature for the compounds O2, NO, and N2, we need to consider their intermolecular forces. Boiling point is generally influenced by the strength of these forces.
1. O2: Oxygen (O2) is a diatomic molecule held together by a double covalent bond. It is a nonpolar molecule, and its boiling point is relatively low compared to other compounds. This is because oxygen molecules experience weak London dispersion forces between them. These forces arise from temporary fluctuations in electron distribution, resulting in temporary dipoles. As a result, oxygen has the lowest boiling point temperature in this sequence.
2. N2: Nitrogen (N2) is also a diatomic molecule held together by a triple covalent bond. Like oxygen, it is a nonpolar molecule and experiences London dispersion forces. However, nitrogen molecules are slightly larger and have more electrons, leading to stronger London dispersion forces compared to oxygen. As a result, nitrogen has a higher boiling point temperature compared to oxygen.
3. NO: Nitric oxide (NO) is a linear molecule with a polar covalent bond. It has a lone pair of electrons on the nitrogen atom, which leads to a dipole moment. This polarity allows for the formation of dipole-dipole interactions between NO molecules, in addition to London dispersion forces. Dipole-dipole interactions are stronger than London dispersion forces alone. Therefore, NO has the highest boiling point temperature among the three compounds.
To summarize, the compounds can be arranged in order of increasing boiling point temperature as follows:
O2 < N2 < NO
Please note that this order is based on the information provided about the compounds and their intermolecular forces. In reality, there may be other factors that can influence boiling point temperature, such as molecular size and shape, which are not considered in this specific question.
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Given the function f(x) = 5x^2 – 6x + 4, find and simplify the difference quotient ( f(x+h) - f(x) ) / h.
The simplified difference quotient is 10x + 5h – 6.
To find the difference quotient for the function f(x) = 5x^2 – 6x + 4, we need to evaluate the expression (f(x+h) - f(x)) / h.
Step 1: Substitute (x + h) into the function f(x) for f(x+h):
f(x + h) = 5(x + h)^2 – 6(x + h) + 4
Step 2: Simplify the expression for f(x + h):
f(x + h) = 5(x^2 + 2hx + h^2) – 6(x + h) + 4
= 5x^2 + 10hx + 5h^2 – 6x – 6h + 4
Step 3: Substitute x into the function f(x):
f(x) = 5x^2 – 6x + 4
Step 4: Subtract f(x) from f(x + h):
f(x + h) - f(x) = (5x^2 + 10hx + 5h^2 – 6x – 6h + 4) - (5x^2 – 6x + 4)
= 5x^2 + 10hx + 5h^2 – 6x – 6h + 4 - 5x^2 + 6x - 4
= 10hx + 5h^2 – 6h
Step 5: Divide the difference by h:
(f(x + h) - f(x)) / h = (10hx + 5h^2 – 6h) / h
= 10x + 5h – 6
Therefore, the simplified difference quotient is 10x + 5h – 6.
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A company plans to construct a wastewater treatment plant to treat and dispose of its wastewater. Construction of a wastewater treatment plant is expected to cost $3 million and an operating cost of $
Constructing a wastewater treatment plant is expected to cost $3 million, with additional operating costs.
Constructing a wastewater treatment plant involves significant upfront costs, estimated at $3 million. This includes expenses related to site preparation, infrastructure development, construction of treatment units, installation of necessary equipment, and other associated costs.
The high cost is attributed to the complex nature of wastewater treatment facilities, which require specialized engineering and technology to ensure effective treatment and disposal of wastewater.
In addition to the construction cost, operating the wastewater treatment plant incurs ongoing expenses. These operating costs encompass various aspects such as energy consumption, maintenance and repairs, labor wages, chemicals for treatment processes, and administrative expenses.
The specific operating costs can vary depending on the size of the plant, the treatment technologies employed, the volume and characteristics of the wastewater being treated, and regulatory requirements.
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A 50,000 liter above ground gasoline storage tank (UST) has leaked its entire contents which penetrated into the surrounding subsurface. Contaminant hydrogeologists confirmed that a soil region in the vadose zone of 20 cubic meters held gasoline in its pore spaces due to capillary forces. The groundwater table occurs several meters below the bottom of the affected vadose zone. Based on the 5% rule, how much gasoline would you expect to be floating on the water table surface? Provide your answer answer in liters with a whole number (no decimals, no commas); Eg: 21000
The expected amount of gasoline to be floating on the water table surface would be 1,000 liters (a whole number with no decimals or commas), the correct answer is 1000.
Given:A 50,000 liter above ground gasoline storage tank (UST) has leaked its entire contents which penetrated into the surrounding subsurface.
Contaminant hydrogeologists confirmed that a soil region in the vadose zone of 20 cubic meters held gasoline in its pore spaces due to capillary forces.The groundwater table occurs several meters below the bottom of the affected vadose zone.
To Find: How much gasoline would you expect to be floating on the water table surface?Based on the 5% rule:This means that only 5% of the gasoline spilled from the tank will end up floating on the water table surface.
Thus, the amount of gasoline that would be expected to be floating on the water table surface would be 5% of the total amount of gasoline that was originally in the vadose zone.
Therefore,Total amount of gasoline in the vadose zone = 20 cubic metersSince 1 m³ = 1000 liters. Therefore, volume of gasoline in the vadose zone = 20 m³ × 1000 liters/m³= 20,000 liters
Since the entire contents of the storage tank were spilled, this is the total amount of gasoline that was originally in the vadose zone.
So,The amount of gasoline floating on the water table surface = 5% of the total amount of gasoline= 5/100 × 20,000= 1,000.
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Determine the moments at B and C. EI is constant. Assume B and C are rollers and A and D are pinned. 5 k/ft ST A IC 30 ft -10 ft- B 10 ft- D
The moment at point B is zero.
The moment at point C is zero. These results are based on the assumptions of roller supports at B and C and the specific loading conditions provided in the problem.
To determine the moments at points B and C, we need to analyze the given beam structure. Considering that points A and D are pinned (fixed), B and C are rollers (allowing vertical movement but preventing horizontal movement), and EI (flexural rigidity) is constant, we can apply the principles of statics and beam theory.
First, let's analyze the beam segment AB. Given that the distributed load on the beam is 5 k/ft, and the length of AB is 30 ft, we can calculate the total load on AB by multiplying the load per unit length by the length:
Load on AB = 5 k/ft * 30 ft = 150 kips
Since point B is a roller, it can only exert a vertical reaction force. The sum of vertical forces on the beam must be zero. Therefore, the reaction at B will be equal in magnitude and opposite in direction to the total load on AB, which is 150 kips.
Next, let's analyze the beam segment BC. The length of BC is 10 ft, and since point C is also a roller, it can only exert a vertical reaction force. The sum of vertical forces on the beam must be zero. Therefore, the reaction at C will be equal in magnitude and opposite in direction to the reaction at B, which is 150 kips.
Now, let's calculate the moments at B and C. Since point B is a roller, it does not resist moments. Therefore, the moment at B is zero.
Similarly, since point C is a roller, it also does not resist moments. Thus, the moment at C is also zero.
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A concrete one-way slab has a total thickness of 120 mm. The slab will be reinforced with 12 -mm-diameter bars with fy =275MPa, Cc =21MPa. Determine the area of rebar in mm2 if the total factored moment acting on 1−m width of slab is 23kN−m width of slab is 23 kN−m. Clear concrete cover is 20 mm.
The area of rebar is approximately 17,333.86 mm^2
To determine the area of rebar in mm2, we need to consider the factored moment and the properties of the reinforcement.
Step 1: Calculate the effective depth of the slab.
Effective depth (d) = total thickness of the slab - clear concrete cover
d = 120 mm - 20 mm
d = 100 mm
Step 2: Calculate the lever arm (a).
Lever arm (a) = (d/2) + (d/6)
a = (100 mm/2) + (100 mm/6)
a = 50 mm + 16.67 mm
a = 66.67 mm
Step 3: Calculate the factored moment capacity (Mn).
Mn = (0.138 * fy * A * (d - a))/(10^6)
Where:
fy = yield strength of the reinforcement = 275 MPa
A = area of the reinforcement
We can rearrange the equation to solve for A:
A = (Mn * 10^6)/(0.138 * fy * (d - a))
A = (23 kN-m * 10^6)/(0.138 * 275 MPa * (100 mm - 66.67 mm))
Converting kN-m to N-mm:
A = (23,000 N-mm * 10^6)/(0.138 * 275 MPa * (100 mm - 66.67 mm))
Simplifying the equation:
A = (23,000,000,000 N-mm)/(37.95 MPa * 33.33 mm)
Using appropriate units for area:
A = (23,000,000,000 N-mm)/(37.95 * 10^6 N/mm^2 * 33.33 mm)
A = 17,333.86 mm^2
Therefore, the area of rebar is approximately 17,333.86 mm^2.
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Let F(x) = integral from 0 to x sin(3t^2) dt. Find the MacLaurin polynomial of degree 7 for F(x)
Answer:
[tex]\displaystyle \int^x_0\sin(3t^2)\,dt\approx x^3-\frac{27}{42}x^7[/tex]
Step-by-step explanation:
Recall the MacLaurin series for sin(x)
[tex]\displaystyle \sin(x)=x-\frac{x^3}{3!}+\frac{x^5}{5!}-...[/tex]
Substitute 3t²
[tex]\displaystyle \displaystyle \sin(3t^2)=3t^2-\frac{(3t^2)^3}{3!}+\frac{(3t^2)^5}{5!}-...=3t^2-\frac{3^3t^6}{3!}+\frac{3^5t^{10}}{5!}-...[/tex]
Use FTC Part 1 to find degree 7 for F(x)
[tex]\displaystyle \int^x_0\sin(3t^2)\,dt\approx\frac{3x^3}{3}-\frac{3^3x^7}{7\cdot3!}\\\\\int^x_0\sin(3t^2)\,dt\approx x^3-\frac{27}{42}x^7[/tex]
Hopefully you remember to integrate each term and see how you get the solution!
An
account with 2.95% interest, compounded continuously, is also
available. What would the balance in this account be after 5 years
if the same $10,000 was invested?
Therefore, the balance in the account after 5 years will be 11,581.28
We have to determine the balance in the account after 5 years if the same $10,000 is invested at 2.95% interest, compounded continuously.
We know that the formula for continuously compounded interest is given by;
A = Pert
Where;
A = final amount
P = principal amount
e = 2.71828
r = annual interest rate
t = time in years
Therefore, the balance in the account after 5 years will be;
A = Pert
A = 10000 × e^(0.0295 × 5)
A = 10000 × e^0.1475
A = 10000 × 1.1581A
= 11,581.28
The balance in the account after 5 years if the same $10,000 was invested at 2.95% interest, compounded continuously is $11,581.28.
Therefore, the balance in the account after 5 years will be;
A = Pert
A = 10000 × e^(0.0295 × 5)
A = 10000 × e^0.1475
A = 10000 × 1.1581A
= 11,581.28
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A composite function. The inner and outer function must be the following equation accordingly. Logarithmic Functions: y=log1.5(x) Exponential Function : y=2x Determine the Instantaneous Rate of Change at x=A Choose a value for A in the domain of your function and show full calculations. Is the function increasing at that point? How do you know?. No marks are given if your solution includes: e or In, differentiation, integration.
The given function is increasing at the point x = A = 2, and the instantaneous rate of change at the point is approximately 2.
For this question, we use the properties of increasing and decreasing functions, the instantaneous rate of change, and their equations.
Usually, to calculate the instantaneous rate of change of the function at a point, we use differentiation. But this time, we'll use a slightly different approach.
The composite function is given by:
f(x) = log₁.₅(x²)
We rewrite this function as follows.
f(x) = log₁.₅(x²) = log₁.₅(x * x) = log₁.₅(x) + log₁.₅(x)
Now, we determine the value of f(A), using A = 2 as our chosen value.
This turns out to be:
f(2) = log₁.₅(2) + log₁.₅(2)
log₁.₅(2) = log(2)/ log(1.5)
= 0.3010/0.176
= 1.7095
So, f(2) = 1.7095 + 1.7095
= 3.419
To determine whether the function is increasing at x = A, we can evaluate f(x) for a value slightly greater than A, such as x = 2.1.
So, for the function:
f(2.1) = log₁.₅(2.1) + log₁.₅(2.1)
log₁.₅(2.1) = log(2.1)/ log(1.5)
= 0.322/0.176
= 1.829
f(2.1) = 1.829 + 1.829 = 3.658.
So, f(2.1) > f(2) for the function.
Thus, the function is increasing at the point A = 2.
Now, to calculate the instantaneous rate of change, we use the following equation.
Instantaneous rate of change = Lim(h -> 0) [(f(A + h) - f(A)) / h]
If we plug in A = 2,
f(A) = f(2) ≈ 3.419
Lim(h -> 0) [(f(A + h) - f(A)) / h] = lim(h -> 0) [(f(2 + h) - 3.419) / h]
As we know, 'h' needs to be small enough to be comparable to zero. We'll take h = 0.0001 for our needs.
[(f(2.0001) - 5.41902) / 0.0001] ≈ (3.4192 - 3.419) / 0.0001
Instantaneous rate of change ≈ (0.0002) / (0.0001)
≈ 2
Therefore, the instantaneous rate of change at the point is 2.
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An oil cooler is used to cool lubricating oil from 80°C to 50°C. The cooling water enters the heat exchanger at 20°C and leaves at 25°C. The specific heat capacities of the oil and water are 2000 and 4200 J/Kg.K respectively, and the oil flow rate is 4 Kgs. a. Calculate the water flow rate required. b. Calculate the true mean temperature difference for (two-shell-pass / four-tube- pass) and (one-shell-pass / two-tube-pass) heat exchangers respectively. c. Find the effectiveness of the heat exchangers.
The water flow rate required is 13.33 kg/s, the true mean temperature difference is -22.2°C and the effectiveness of the heat exchangers is 0.25.
Given data: Initial oil temperature, To = 80°C
Final oil temperature, T1 = 50°C
Initial water temperature, Twi = 20°C
Final water temperature, Two = 25°C
Specific heat of oil, c1 = 2000 J/kg.K
Specific heat of water, c2 = 4200 J/kg.K
Oil flow rate, m1 = 4 kg/s
a) Water flow rate required: Heat removed by oil = Heat gained by water
m1*c1*(To - T1) = m2*c2*(Two - Twi)m2/m1
= c1(T0 - T1) / c2(Two - Twi) = 0.28/ 0.021
= 13.333 kg/s
b) True mean temperature difference: Using the formula,
ln (ΔT1/ΔT2) = ln [(T1 - T2)/(To - T2)]
ΔT1 = T1 - T2
ΔT2 = To - T2
For two-shell-pass / four-tube-pass heat exchanger:
Here, the number of shell passes, Ns = 2
Number of tube passes, Nt = 4T1 = (80 + 50)/2 = 65°C
T2 = (20 + 25)/2 = 22.5°C
ΔT1 = 50 - 22.5 = 27.5
ΔT2 = 80 - 22.5 = 57.5
ln (ΔT1/ΔT2) = ln [(T1 - T2)/(To - T2)]
= ln[(65-22.5)/(80-22.5)]
= 1.3517
ΔTm = (ΔT1 - ΔT2)/ln (ΔT1/ΔT2)
= (27.5 - 57.5)/1.3517
= -22.2°C
For one-shell-pass / two-tube-pass heat exchanger: Here, the number of shell passes, Ns = 1
Number of tube passes, Nt = 2
T1 = (80 + 50)/2 = 65°C
T2 = (20 + 25)/2 = 22.5°C
ΔT1 = 50 - 22.5 = 27.5
ΔT2 = 80 - 22.5 = 57.5
ln (ΔT1/ΔT2) = ln [(T1 - T2)/(To - T2)]
= ln[(65-22.5)/(80-22.5)]
= 1.3517
ΔTm = (ΔT1 - ΔT2)/ln (ΔT1/ΔT2)
= (27.5 - 57.5)/1.3517
= -22.2°C
c) Effectiveness of the heat exchangers: Using the formula,
ε = Q/ (m1*c1*(To - T1))
ε = Q / (m2*c2*(T2 - T1))
For two-shell-pass / four-tube-pass heat exchanger:
Q = m1*c1*(To - T1) = 4*2000*(80 - 50) = 320000 J/s
ε = Q / (m2*c2*(T2 - T1)) = 320000 / (13.333*4200*(25-20)) = 0.25
For one-shell-pass / two-tube-pass heat exchanger:
Q = m1*c1*(To - T1) = 4*2000*(80 - 50) = 320000 J/s
ε = Q / (m2*c2*(T2 - T1)) = 320000 / (13.333*4200*(25-20)) = 0.25
Therefore, the water flow rate required is 13.33 kg/s, the true mean temperature difference is -22.2°C and the effectiveness of the heat exchangers is 0.25.
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