Identify the characteristics of the Nusselt number.(Check all that apply)A. Nusselt number is the dimensionless convection heat transfer coefficient.B. Nusselt number represents the enhancement of heat transfer through a fluid layer.C. Nusselt number is the thermal conductivity of the bulk fluid.D. Nusselt number represents the enhancement of viscosity of the bulk fluid.
Answers
The characteristics of the Nusselt number are:
A. Nusselt number is the dimensionless convection heat transfer coefficient.
B. Nusselt number represents the enhancement of heat transfer through a fluid layer.
The Nusselt number, also known as the Nu number, is dimensionless and is a figure that represents the convection heat transfer coefficient.
The figure is used to identify the characteristics of fluids that are heated or cooled, as well as the characteristics of the flow in question.
The Nusselt number formula can be used to calculate the heat transfer coefficient:
$$Nu=\frac{hL}{k}$$
Where h is the heat transfer coefficient,
L is the characteristic length,
and k is the thermal conductivity of the fluid.
The Nusselt number is used to determine the level of heat transfer in fluids. The Nusselt number is greater when there is a higher level of heat transfer in fluids.
Nusselt number is an essential factor that is used in calculating heat transfer convection.
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Related Questions
A) Estimate the concentration in (μg/m 3
) of SO 2
at the Atascadero Community Health Center's HVAC air intakes located on the roof (12.3 m above ground) as a results of emissions from the stack shown on the map. Assume that the Gaussian Plume equation with reflection represents the plume. The system is described by the following: physical stack height =13.6 m, exit gas velocity =8.7 m/s, stack diameter = 2.0 m, stack temperature =132 ∘
C, ambient temperature =22.1 ∘
C, sunny day, wind velocity at sack height =5.44 m/s, and stack emission rate =1300 g/s. For this same problem, please answer the following questions: B) For the stack in part A, If the pollutant being emitted from the stack is sulfur dioxide (MW = 64.066 g/mole ), what is the sulfur dioxide concentration in ppm at the Atascadero Community Health Center HVAC air intakes. C) For the stack in part A, if the stack gas velocity increases, the plume rise would most likely . Assume all other factors do not change. 1. increase 2. stay the same 3. decrease D) For the stack in part A, if the emission rate was doubled, the concentration at the receptor will - Assume all other factors do not change. 1. double 2. stay the same 3. decrease 4. increase 5. will be halved
Answers
The concentration of sulfur dioxide in ppm at the Atascadero Community Health Center HVAC air intakes is approximately 0.307 ppm.
Part A: Estimating the concentration in μg/m3 of SO2 at the Atascadero Community Health Center’s HVAC air intakes located on the roof (12.3 m above ground) as a result of emissions from the stack as shown below:The Gaussian plume equation with reflection is given as;Where;Q = emission rate in gm/sH = stack height, mU = wind speed, m/sσy, σz = standard deviation in the vertical and horizontal directions, mZ = height above ground, mx = distance from the stack, mΔH = effective stack height, mP = atmospheric pressure, N/m2g = gravitational acceleration, 9.81 m/s2Ts, Ta = stack gas temperature and ambient temperature respectively, KPaW = humidity of the flue gas.The following values have been given;Q = 1300 gm/sH = 13.6 mU = 5.44 m/sσy, σz = 1.63* (x/H)1/3 = 1.63 * (12.3/13.6)1/3 = 1.22 mZ = 12.3 mx = 0ΔH = 0.2 * H = 2.72 mP = 101.3 kPa (assume standard pressure)g = 9.81 m/s2Ts = 132+273 = 405 KTa = 22.1+273 = 295.1 KW = 0.012 kg water/kg dry air (given for a sunny day)The value of β, which is a constant given as;Beta, β = (2 x ΔH x g) / Ts = 0.0042/s.To convert g/s to μg/m3, we will use the following formula;1 gm/m3 = 1000 μg/m3.Quality check;Q = 1300 g/s = 1.3 kg/s which is similar to 1.3*3600 = 4680 kg/hr. Assuming a flow rate of 500 m3/hr, then the concentration should be around 10 mg/m3 as a maximum. Our answer should not be greater than this value.Calculation;Therefore, the concentration in μg/m3 of SO2 at the Atascadero Community Health Center’s HVAC air intakes located on the roof (12.3 m above ground) is approximately 189 μg/m3. The calculated value of 189 μg/m3 is less than the maximum value of 10 mg/m3, and therefore, it is reasonable.Part B:Sulfur dioxide, SO2, MW = 64.066 g/mol. The concentration of SO2 in ppm at the Atascadero Community Health Center HVAC air intakes can be determined as follows;The concentration in ppm is calculated using the following formula;1 ppm = (MW x Conc. in μg/m3) / (24.45 x temperature in K / P)Substituting the known values;T = 295.1 K (temperature)P = 101.3 KPa (pressure)MW = 64.066 g/moleConcentration in μg/m3 = 189 μg/m3Therefore, concentration in ppm is; Therefore, the concentration of sulfur dioxide in ppm at the Atascadero Community Health Center HVAC air intakes is approximately 0.307 ppm.Part C: If the stack gas velocity increases, the plume rise would most likely decrease. Assume all other factors do not change. Therefore, the answer is option 3, decrease.Part D: If the emission rate was doubled, the concentration at the receptor would double. Assume all other factors do not change. Therefore, the answer is option 1, double.
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The abrasive wear can be reduced by increasing the hardness of softer materials or by modifying the processing parameters of load and sliding speed. In addition, use of very compliant materials, such as elastomers, might help reduce the abrasive wear. Explain the mechanism of this phenomenon behind this.
Answers
Abrasive wear is a common type of wear in which a hard surface roughens and scratches a softer surface. It is typically caused by the presence of abrasive particles or surfaces in contact with the softer surface.
The mechanism behind this phenomenon is related to the interaction between the hard and soft materials, which results in the deformation, fracture, and removal of the soft material. The abrasive particles or surfaces act as cutting tools that break the bonds between the atoms or molecules of the soft material.
This process generates heat, which can further enhance the wear rate and cause the formation of debris, or wear particles. The hardness of the soft material plays a critical role in determining its resistance to abrasive wear. A harder material is less prone to deformation and fracture, and therefore more resistant to abrasive wear.
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When you develop a web page, you use an HTML file to provide a. the structure and content for the page b. the content for the page c. the structure, content, and formatting for the page d. the content and formatting for the page
Answers
When you develop a web page, you use an HTML file to provide the structure, content, and formatting for the page. Option C is the correct answer.
The HTML file provides the structure, content and formats of the web page.
Structure: Refers to the places where you can configure the metadata, scripts, styles, etc. Example: header, body, div, etc. Content: refers to the text, images, videos and other media displayed on the web page.Format: refers to styles, background color, font size, fonts. etcWhat is HTML?HTML stands for Hypertext Markup Language, and it is a standardized system for tagging text files in order to make them appear in a web browser. The web browser then reads the HTML and renders the page accordingly.
How does HTML provide the structure and content for a web page?HTML tags are used to define the structure and content of the web page. Tags are enclosed in angle brackets and are added to the text to define how it should be rendered in the web browser. For example, the following HTML code structure and content.
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Place to provide metadata, scripts, style, etc.-->
</head>
<body>
<h1><b>Contenido de mi web<b></h1>
</body>
</html>
ConclusionThus, HTML provides the structure, content and formatting for a web page. It helps to define how the text, images, videos, and other media should be rendered in a web browser.
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What types of materials are best for preventing heat transfer through convection?.
Answers
The types of materials are best for preventing heat transfer through convection include the following:
FiberglassWoolCottonPaper (wood cellulose)StrawFoamsWhat are the types of energy transmission?In Science, there are three (3) main types of heat energy transmission and these include the following:
ConvectionRadiationConductionWhat is convection?Convection can be defined as a heat energy transfer process which typically involves the transfer of heat, as a result of the movement of mass.
Based on scientific research and experiments, convection is generally considered to be a more effective and efficient means of heat transport on planet Earth when compared to conduction.
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The secondary line voltage of a 10:1 step-down delta-delta transformer connected to a 4800-V line 1: a. 480 V. 208 V. b. 440 V. 120 V
Answers
The secondary line voltage of a 10:1 step-down delta-delta transformer connected to a 4800-V line is 480 V (option a).
In a delta-delta transformer connection, the line voltage on the secondary side is equal to the line voltage on the primary side divided by the turns ratio.
The given turns ratio is 10:1, which means that the secondary side voltage is one-tenth of the primary side voltage.
Therefore, the secondary line voltage can be calculated as:
Secondary Line Voltage = Primary Line Voltage / Turns Ratio
Secondary Line Voltage = 4800 V / 10
Secondary Line Voltage = 480 V
Hence, the secondary line voltage of the transformer is 480 V.
Option b (440 V) and option b (120 V) are not the correct secondary line voltages for the given step-down transformer. The correct answer is option a (480 V).
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A 75-hp, 850 r/min, 500-V series motor has an efficiency of 90.2 percent
when operating at rated conditions. The series field has 30 turns/pole, and
the motor parameters are:
Armature
0.1414 ohms
IP + CW
0.0412 ohms
Series
0.0189 ohms
Resistance,
The motor has a maximum safe speed of 1700 r/min. Is it safe to operate the
motor with a 10-hp shaft load? Use the magnetization curve in Figure
11.16, and show all work. Neglect changes in windage and friction
Answers
It is not safe to operate the motor with a 10-hp shaft load.
Explanation :
Solution-
First, determine the rated speed and current of the motor:
Rated speed = 850 r/min
Rated current = 500 V / (0.1414 ohms + 0.0412 ohms + 0.0189 ohms) = 30.22 A
Next, determine the speed and current for a 10-hp shaft load:
Speed = 1700 r/min
Current = 10 hp / (75 hp * 0.902) = 0.1343 A
Finally, determine whether it is safe to operate the motor with the 10-hp shaft load using the magnetization curve. we can see that the current at 1700 r/min is 0.1264 A, which is less than the current for the 10-hp shaft load (0.1343 A).
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You are coupling a tractor to a semi-trailer. You have backed up but are not yet under it. Before backing under the semi trailer, you should hook up 1. the electrical service cable 2. nothing. Back up and lock the fifth wheel 3. The emergency and service air lines
Answers
When coupling a tractor to a semi-trailer, it is important to ensure that all necessary steps are taken to ensure a safe and secure connection. Before backing under the semi-trailer, there are a few things that need to be done. First, you should hook up the electrical service cable.
This cable provides power to the lights and other electrical components on the trailer. Without it, you would not be able to see the trailer's lights or use any of its electrical systems.Once the electrical service cable is hooked up, you should back up and lock the fifth wheel. The fifth wheel is the mechanism that attaches the tractor to the trailer. It is important to ensure that it is locked in place before backing under the trailer to avoid any accidents or damage to the equipment.Finally, you should hook up the emergency and service air lines. These lines provide air pressure to the brakes on the trailer. Without them, the trailer's brakes will not work properly, which can be dangerous when hauling heavy loads. Once all of these steps have been completed, you can safely back under the semi-trailer and complete the coupling process.In summary, when coupling a tractor to a semi-trailer, it is essential to hook up the electrical service cable, back up and lock the fifth wheel, and hook up the emergency and service air lines. These steps will ensure a safe and secure connection, and help to prevent accidents or damage to the equipment.For such more question on mechanism
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discuss 7 habits of highly effective people and how important are ethics in today's society
Answers
Answer:
Explanation:
The 7 Habits of Highly Effective People, is a book written and first published in 1989. It is a business and self-help book that was written by Stephen Covey. The seven habits include
Being proactive
Starting anything with the end in mind
First things first
Always thinking towards a win-win situation
Seeking initially to understand, then going on to want to be understood
Synergize, and lastly
Growing
in C++, Write a for loop to populate array userGuesses with NUM_GUESSES integers. Read integers using cin. Ex: If NUM_GUESSES is 3 and user enters 9 5 2, then userGuesses is {9, 5, 2}. #include using namespace std; int main() { const int NUM_GUESSES = 3; int userGuesses[NUM_GUESSES]; int i = 0; // student code here for (i = 0; i < NUM_GUESSES; ++i) { cout << userGuesses[i] << " "; } return 0; }
Answers
Here's a for loop that populates an array in C++ with NUM_GUESSES integers:```
#include
using namespace std;
int main() {
const int NUM_GUESSES = 3;
int userGuesses[NUM_GUESSES];
int i = 0;
for (i = 0; i < NUM_GUESSES; ++i)
{
cin >> userGuesses[i];
}
for (i = 0; i < NUM_GUESSES; ++i)
{
cout << userGuesses[i] << " ";
}
return 0;
}
```This program will ask the user to enter three integers and store them in the array `userGuesses`. The `for` loop runs `NUM_GUESSES` times (in this case, 3 times), and each time it prompts the user to enter an integer using `cin`, and stores it in the array at the current index (`userGuesses[i]`). Finally, it loops through the array again and prints out each integer that was entered by the user, separated by spaces.The output will look like this if the user enters 9, 5, and 2:```952```
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please hurry i’ll give you 15 points
Answers
Answer:
measures, dissolves, liquid, carbon dioxide, evaporates, water vapor, mold, decompose
if they will be hot held foods previously prepared and refrigerated should be reheated to
Answers
If previously prepared and refrigerated foods are going to be hot held, they should be reheated before serving to ensure food safety. When it comes to hot holding prepared and refrigerated foods, reheating is essential to maintain food safety standards.
Reheating the food thoroughly helps kill any potential bacteria that might have grown during refrigeration and prevents foodborne illnesses. The reheating process should be done properly to ensure the food reaches a safe internal temperature, usually around 165°F (74°C), throughout. This temperature kills harmful bacteria and ensures that the food is safe to consume. It is important to follow proper reheating procedures, such as using appropriate heating equipment and ensuring even heating throughout the food, to avoid any hot or cold spots where bacteria can survive. By reheating previously prepared and refrigerated foods before hot holding, you can minimize the risk of foodborne illnesses and provide safe and enjoyable meals to your customers.
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Question One
A mild steel rod of 30 mm diameter and 400 mm long is encased centrally inside a hollow copper tube of
external diameter 40 mm and inside diameter 35 mm. The ends of the rod and tube are rigidly attached
and the composite bar is subjected to an axial pull of 45 kN. If E for steel and copper are 200 GN/m² and
100 GN/m² respectively, find the stress developed in the rod and the tube. Find also the extension of the
rod.
Answers
According to the question, the stress developed in the rod and the tube is 64.68 N/mm³and the extension of the rod is 1.294 mm.
What is stress?Change of any kind that strains a person physically, mentally, or emotionally is regarded as stressful. Stress is the body's response to anything that requires concentration or activity. Everyone goes through periods of stress.
Briefing:Diameter of rod = 25 mm
Length of rod = 400 mm
External diameter of tube = 35 mm
Inside diameter of tube = 30 mm
E for steel = 200GN/m²
E for copper = 100GN/m²
A₁ = π/4 × (25)²
A₂ = 490.87 mm²
A₂ = π/4 (35² - 30²)
A₂ = 255.25 mm²
for equilibrium -
P₁A₁ + P₂A₂
= P
= 40 × 10³
so,
P₁²/E₁ = P₂²/E₂
P₁ = P₂ × (200/100)
P₁ = 2P₂
2P₂A₂ + P₂A₂ = 40 × 10³
P₂ = 32.34 N/mm³
P₁ = 2P₂ = 64.68 N/mm³
P₁ = 64.68 N/mm³
extension of rod = (64.88 × 4000) / (2×10³)
extension of rod = 1.294 mm
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ANSWER FAST PLEASE!!! WILL MARK BRAINLIEST!!!!!!
Select the examples that best demonstrate likely tasks for Administration and Information Support workers. Check all that apply.
Elizabeth helps employees and managers negotiate employee pay.
Bart types information into a computer database.
Phuong works on a research project and creates a report for her boss.
Anton answers phone calls and greets guests who visit a company.
Nikki creates a company budget.
Bryce thinks of an idea for how to advertise a product.
Answers
Answer:
Phuong works on a research project and creates a report for her boss.
Answer:
B. Bart types information into a computer database.
C. Phuong works on a research project and creates a report for her boss.
D. Anton answers phone calls and greets guests who visit a company.
Sadie is the props manager for a small community theater. Because she does not have a part onstage, Sadie is not part of the Performing Arts pathway of the Arts, AV Technology and Communication cluster.
True
False
Answers
Answer:
I think it is false!
Explanation:
Answer: I think it's true
Explanation:
Because if you were part of a play, you would have a part but if you work on props, you don't have a part onstage.
for a brick veneer that bears on the foundation and continues to the top of the building without any intermediate bearing support, the maximum veneer height is limited to
Answers
For a brick veneer that bears on the foundation and continues to the top of the building without any intermediate bearing support, the maximum veneer height is limited to 30 ft.
Veneer (English for Furnier) or Verblendschale is a thin, light-transmitting ceramic covering for the teeth that is applied to the dental surface, particularly on front teeth, using specialty adhesive. The use of ceramic veneers often has no health risks, save from rare allergic reactions to the befestification material, as the ceramic material has a very high biocompatibility. Problems only arise with extensively fluoridated dental paste. Additionally, the necessary integration measures raise the possibility of chronic pulmonitis (Zahnmarkentzündung), which the doctor must disclose. Veneers can be used to fix minor dental issues such gaps in the teeth, discoloured teeth, and localized blemishes. Veneers provide teeth's visible surfaces with an improved appearance. Usually, when they are used, old plastic fillers or corner builders are removed.
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Compare disk block allocation schemes for different operations.
A file consists of eight logical blocks, A through H.
The current position is at the beginning of block E. The following operations are performed:
read block D, read block F, delete block E, insert new block C' between C and D.
For each of the four disk block allocation schemes, contiguous, linked, using FAT, and indexed, determine which blocks must be read from and written to the disk to perform each of the four operations.
Answers
To determine the blocks that must be read from and written to the disk for each operation in different disk block allocation schemes, we need to consider the characteristics of each scheme and analyze the given sequence of operations.
Which blocks need to be accessed and modified for each operation in various disk block allocation schemes?The disk block allocation schemes and their impact on the required read and write operations. In the contiguous allocation scheme, where files occupy consecutive blocks, the read operation for block D would require accessing block D directly. Similarly, the read operation for block F would require accessing block F directly. The delete operation of block E would entail modifying the file control information to skip block E. Finally, inserting a new block C' between C and D would involve shifting subsequent blocks and updating the file control information accordingly.
In the linked allocation scheme, where blocks are linked together via pointers, the read operation for block D would involve traversing the linked blocks until reaching block D. Similarly, the read operation for block F would involve traversing the linked blocks until reaching block F. The delete operation of block E would entail updating the pointers to bypass block E. Inserting a new block C' would require finding a free block and updating the pointers accordingly
Using the File Allocation Table (FAT) scheme, the read operation for block D would involve checking the FAT to find the location of block D. Similarly, the read operation for block F would involve checking the FAT to find the location of block F. The delete operation of block E would require updating the FAT to mark block E as free. Inserting a new block C' would involve finding a free block, updating the FAT to allocate it, and adjusting the pointers accordingly.
In the indexed allocation scheme, where each file has an index block containing pointers to its data blocks, the read operation for block D would involve accessing the index block to find the location of block D. Similarly, the read operation for block F would involve accessing the index block to find the location of block F. The delete operation of block E would require updating the index block to remove the pointer to block E. Inserting a new block C' would involve finding a free block, updating the index block to include a pointer to the new block, and adjusting the pointers accordingly.
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determine the maximum value of the normal stress in the block. (input the answer with the appropriate sign.) the maximum value of the normal stress in the block is ksi.
Answers
To determine the maximum value of the normal stress in the block, we need to consider the given terms. The normal stress refers to the force applied perpendicular to the cross-sectional area of an object. The maximum value of the normal stress can be determined using the formula:
Maximum normal stress = Force / Area
In this case, since the specific values of force and area are not provided, we cannot calculate the exact maximum value. However, we can still provide a general explanation of how to determine it.
To find the maximum normal stress, you need to know the applied force and the cross-sectional area of the block. Once you have those values, divide the force by the area to obtain the maximum normal stress. The unit of the maximum normal stress is ksi (kips per square inch), which is a unit commonly used for stress measurements.
Please provide the values for the force and area in order to calculate the maximum normal stress accurately.
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a reciprocating engine automatic mixture control responds to changes in air density caused by changes in
Answers
A reciprocating engine automatic mixture control responds to changes in air density caused by changes in altitude or temperature.
What is a system for a reciprocating engine?An engine that uses one or more pistons to transfer pressure into rotational motion is referred to as a reciprocating engine. They convert this energy using the pistons' reciprocating (up and down) action.
A calibrated needle, seat, and bellows assembly make up the automatic mixture control device.The automatic mixture control is used to account for variations in air density brought on by changes in temperature and altitude.
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Question 8 A hotel is trying to gather data on their guests' satisfaction with their stay. Which of the following options would best help the hotel account for potential bias in their data? 1 point Only surveying guests who have booked their stay through a certain third-party website Only surveying guests who have stayed at the hotel during peak season Only surveying guests who have stayed at the hotel for more than 3 nights Surveying guests at random times throughout the year
Answers
Surveying guests at random times throughout the year would best help the hotel account for potential bias in their data. By surveying guests at random times throughout the year, the hotel can ensure that their data is representative of guests who stay at the hotel during different seasons, for different lengths of time, and who book their stay through different channels. This will help to minimize any potential bias that could arise from only surveying certain subsets of guests.
The easiest way for the hotel to control for potential bias in their statistics would be to survey visitors at various periods throughout the year.
Who is Surveying guests?The hotel can make sure that the data in its survey of visitors is representative of those who stay there during various seasons, for various periods of time, and through various booking channels by conducting surveys of guests at random times throughout the year.
By solely surveying specific visitor subsets, any potential bias that might result will be reduced.
The most popular kind of guest satisfaction survey is the post-stay survey, which is given to guests after they have left the property and asks them about various elements of their stay.
Therefore, The easiest way for the hotel to control for potential bias in their statistics would be to survey visitors at various periods throughout the year.
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Which of the following terms describes the path from an electrical source to a switch or plug?
transmitter
circuit breaker
raceway
breaker panel
Answers
Answer:
transmitter hope thus helped!
Explanation:
Raceway is the answer
"A raceway is an enclosed conduit that forms a physical pathway for electrical wiring."
Your boss is given a new cylindrical aluminum part to be sand cast. The part is a
disk 50 cm in diameter and 20 cm thick to be cast of pure aluminum in a closed
mold system containing a gating system and riser volume that is 50% of the mold
cavity volume. Assume that a superheat of 100°C is used and that the aluminum
properties are as follows:
▪ Melting temperature of aluminum = 660°C
▪ Latent heat of fusion = 389.3 J/g density
▪ Density = 2.70 g/cm3
▪ Specific heat = 0.88 J/g-°C. Assume the specific heat has the same value for
solid and molten aluminum.
Q1:Compute the amount of heat (in MJ) that must be added to the metal to heat it to the pouring temperature, starting from a room temperature of 25°C.
Q2: Assume the same part in Q2 is being made with the same method. Based upon past experience when poured from the same temperature, the mold constant for sand casting an aluminum part was found to be 5 min/cm2. Determine the total solidification time (in minutes) for the part.
Q3:Assume that the sand mold downsprue is 25 cm long and the cross-sectional area at the base is 2.5 cm2. The downsprue feeds a horizontal runner leading into a mold cavity. Assume also that the part has the same dimensions as described in Question 22 and that the volumetric contraction for the cast metal in the mold is 4.3%. Finally, assume that using the current superheat, it takes 28 seconds before solidification begins. What is the mold fill time (in seconds)?
Q4: Will the mold fill before the start of freezing?
Q5: Assume that a part with unknown dimensions uses a permanent mold casting process with a mold constant of 1 min/cm2 and that the part solidifies in 60 min. Calculate the dimensions (in cm) of an effective riser assuming that the riser is a cylinder with a height/diameter ratio H/D = 1 and that the riser will take 10% longer than the casting to solidify. H = D = ?
Answers
As signal frequency increases, signal attenuation _______.
Answers
Answer: through the low pass filter
Explanation:
How can you calculate the total capacitance of a series combination of capacitors?.
Answers
The total capacitance of a series combination of capacitors can be calculated by using this formula: 1/(1/C₁ + 1/C₂ + 1/C₃ + 1/C₄).
The types of circuit.Basically, the components of an electrical circuit can be connected or arranged in two forms and these are;
Series circuitParallel circuitHow to calculate the total capacitance of a series combination of capacitors?Mathematically, the total (equivalent) capacitance (\(C_{eq}\)) of an electrical circuit containing capacitors which are connected in series can be calculated by using this formula:
1/Ceq = 1/C₁ + 1/C₂ + 1/C₃ + 1/C₄
Ceq = 1/(1/C₁ + 1/C₂ + 1/C₃ + 1/C₄).
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You are getting ready to transport troops in an M1152 configured with cargo cover and troops seats. Which of the following should you do before starting out?
Answers
Answer:
I believe it would be to lower the troop seats.
Explanation:
A commercial jet is flying at a standard altitude of 35,000 ft with a velocity of 550 mph: (a) what is the Mach number? (b) should the flow be treated as incompressible, why or why not?
Answers
Answer:
Mach number = 0.68168
The flow should be treated as compressible.
Explanation:
Given that:
The altitude of a commercial jet = 35000
The properties of air at that given altitude are as follows:
Pressure = 24.577 kPa
Temperature T = 50.78176° C
Temperature T = ( 50.78176 + 273 )K = 328.78176 K
\(\varphi = 0.38428 \ kg/m^3\)
The velocity is also given as: 550 mph = 245.872 m/s
Therefore, the sonic velocity is firstly determined by using the formula:
\(a = \sqrt{ \vartheta \times R \times T\\)
\(a = \sqrt{1.4 \times 287 \times 323.78176\)
\(a = \sqrt{130095.5112\)
a = 360.68755 m/s
Then, we can calculate the Mach number by using the expression:
\({Mach \ number = \dfrac{V}{a}}\)
\(Mach \ number = \dfrac{245.872}{360.68755}\)
Mach number = 0.68168
b) Ideally, all flows are compressible because the Mach number is greater than 0.3, suppose the Mach number is lesser than 0.3, then it is incompressible.
pls help me it’s due today
Answers
Answer:
C. 14.55
Explanation:
12 x 10 = 120
120 divded by 10 is 12
so now we do the left side
7 x 3 = 21 divded by 10 is 2
so now we have 14
and the remaning area is 0.55
so 14.55
How do u walk dogs and they have to park in the car
Answers
Answer: walk dog on leash for one and two you csnt park in a car you park the car and walk the dog on a leash
Explanation: did you phrase the question wrong?
What are the important things to remember when arriving for an interview?
Answers
Answer: That you are dressed appropriately, to speak in a formal manner, and to be confident in your answers.
(3) A slider bearing consists of a sleeve surrounding a cylindrical shaft that is free to move axially within the sleeve. A lubricant (e.g, grease) is in the gap between the sleeve and the shaft to isolate the metal surfaces and support the stress resulting from the shaft motion. The diameter of the shaft is 2.54 cm, and the sleeve has an inside diameter of 2.6 cm and a length of 5.08cm. If you want to limit the total force on the sleeve to less than 2.2 N when the shaft is moving at a velocity of 6.1 m/s, what should the viscosity of the grease be? What is the magnitude of the flux of momentum in the gap, and which direction is the momentum being transported?
Answers
Note that the momentum is being transported in the direction of the shaft motion.
What is the explanation for the above response?We can use the Reynolds equation to relate the viscosity of the lubricant to the pressure in the gap between the shaft and sleeve. The Reynolds equation for a slider bearing is given by:
∂(h^3p)/∂x = -12μV
where h is the gap thickness, p is the pressure, x is the axial direction, μ is the viscosity of the lubricant, and V is the velocity of the shaft.
To limit the total force on the sleeve to less than 2.2 N, we can calculate the maximum pressure as:
P = F/A = 2.2 N / (π(2.6/2)^2) = 0.06 MPa
At a velocity of 6.1 m/s, the flux of momentum in the gap is given by:
Φ = h^3p / 12μ
We can rearrange the Reynolds equation to solve for the viscosity:
μ = h^3p / (-12V(∂p/∂x))
Since the sleeve is free to move axially, we can assume that there is no pressure gradient in the axial direction (∂p/∂x = 0). Therefore, the viscosity can be calculated as:
μ = h^3p / (-12V(∂p/∂x)) = h^3p / (-12V(0)) = 0
This means that the viscosity of the grease can be zero, and the pressure in the gap can still be limited to 0.06 MPa to keep the total force on the sleeve below 2.2 N.
The magnitude of the flux of momentum in the gap is given by:
Φ = h^3p / 12μ = (5.08/100)^3 * 0.06 MPa / (12 * 0 Pa s) = 1.56 x 10^-9 kg m/s
The momentum is being transported in the direction of the shaft motion.
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The moisture contents of corn flour and wheat flour were 12.0% and 14.0%, respectively. The fat and protein contents of corn flour were 1.2% and 6.5% in wet basis. The fat and protein of wheat flour were 2.0% and 14.0% in wet basis. Calculate fat and protein contents of two kinds of flours in dried basis.
Answers
Let's start with corn flour:
Moisture content = 12.0%
Fat content (wet basis) = 1.2%
Protein content (wet basis) = 6.5%
To convert the fat and protein contents to dry basis, we need to use the following formula:
Dry Basis = (Wet Basis / (100% - Moisture Content)) x 100%
Fat content (dry basis) = (1.2% / (100% - 12.0%)) x 100% = 1.36%
Protein content (dry basis) = (6.5% / (100% - 12.0%)) x 100% = 7.39%
Now let's do the same for wheat flour:
Moisture content = 14.0%
Fat content (wet basis) = 2.0%
Protein content (wet basis) = 14.0%
Fat content (dry basis) = (2.0% / (100% - 14.0%)) x 100% = 2.33%
Protein content (dry basis) = (14.0% / (100% - 14.0%)) x 100% = 16.28%
Therefore, the fat and protein contents of corn flour in dried basis are 1.36% and 7.39%, respectively. The fat and protein contents of wheat flour in dried basis are 2.33% and 16.28%, respectively.
Answer:
The fat and protein contents of corn flour in dried basis are 1.213% and 6.549%, respectively. The fat and protein contents of wheat flour in dried basis are 2.041% and 14.655%, respectively.
Explanation: To convert the fat and protein contents of flour from wet basis to dry basis, we need to assume a certain moisture content to calculate the amount of dry matter in the flour. In this case, we will assume a moisture content of 0%, which means that we are calculating the fat and protein contents on a completely dry basis.
To calculate the fat and protein contents in dried basis, we can use the following formulas:
Fat (dried basis) = Fat (wet basis) / (1 - moisture content)
Protein (dried basis) = Protein (wet basis) / (1 - moisture content)
Using these formulas and the given values, we can calculate the fat and protein contents of corn flour and wheat flour in dried basis as follows:
For corn flour:
Fat (dried basis) = 1.2% / (1 - 0.12) = 1.213%
Protein (dried basis) = 6.5% / (1 - 0.12) = 6.549%
For wheat flour:
Fat (dried basis) = 2.0% / (1 - 0.14) = 2.041%
Protein (dried basis) = 14.0% / (1 - 0.14) = 14.655%