Pressure drop in contraction section = 133 kPa. The pressure difference due to friction losses is = 39.7 kPa. Pressure difference due to kinetic energy changes = 93 kPa.
Find the pressure drop across the contraction section?
P is the pressure drop per 100 feet of pipe and the formula is P = 0.0668 V. D2.D is the inside diameter of the pipe measured in inches. Viscosity is expressed in centipoise (not SSU).
The Le/D approach simply increases the multiplier in equation (1) (i..L/D) with the length of the straight pipe (i..Le), which would cause a pressure drop equal to the connection losses, hence the term "equivalent length".
So ( L + Le ) /D is a multiplier.
The fluid flowing through the contraction (reduction in pipe diameter) causes an increase in velocity, resulting in a greater pressure drop than an equivalent straight pipe.
Pressure drop during contraction = 133 kPa.
Pressure difference due to friction losses = 39.7 kPa.
Pressure difference due to kinetic energy changes = 93 kPa.
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In a poll of 1000 randomly selected voters in a local election, 625 voters were against school bond measures. What is the sample proportion p? What is the margin of error m for the 99% confidence level?
Answer:
p = 625 / 1000 = 0.625
m = 2.576 * sqrt((0.625 * (1 - 0.625)) / 1000) = 0.03
Explanation:
The sample proportion p is the proportion of voters in the sample who were against school bond measures. To calculate this, divide the number of voters against the bond measures (625) by the total number of voters in the sample (1000):
p = 625 / 1000 = 0.625
The margin of error m for a sample proportion at the 99% confidence level can be calculated using the formula:
m = zsqrt(p(1-p)/n)
where z is the z-score for the desired level of confidence (for a 99% confidence level, z = 2.576), p is the sample proportion, and n is the sample size.
m = 2.576 * sqrt((0.625 * (1 - 0.625)) / 1000) = 0.03
So the margin of error for this poll at the 99% confidence level is 0.03.
Which of the following best describes teachers in the later developmental stages of technology integration?
a. Adjusting the fundamental nature of their instruction.
b. Using technology to support traditional instruction.
c. Adapting instruction to technology.
d. Substituting paper-and-pencil activities with technology.
Making decisions about core technology/protocols and circuit capacity during the technical design phase of a network is interconnected.
Network design is the planning and construction of a communications network. Network design begins with the identification of business and technical needs before network installation. Information concealment and hierarchical design are examples of time-tested principles that apply to good network architecture. Fundamental network protocols that use data encapsulation serve as one example of this. Changes in the lower layers have no impact on the upper layers since they operate in secrecy from the higher layers (i.e. applications). In addition to managing computer systems, they also install and support them. This list could also include intranets, network segments, local area networks (LANs), wide area networks (WANs), and other data transmission technologies.
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How to report interest income from the Internal Revenue Service?
Requires that most interest payments be reported on a 1099-INT tax form by the individual or entity making the payment. Most often this is a bank, other financial institution, or government agency.
What does payment mean?
One of the most popular forms of payment is cash (bills and change). ). .
Purchase will be made to buyer's account in the form of a personal check (US check). Debit Card: When a debit card is used to make a purchase, the buyer's account is charged immediately. Comparable to debit cards are credit cards. Payment occurs when agreed-upon amounts of products and services are exchanged for cash, goods, or services that are acceptable to all parties. Exchange of services, cash, cheques, wire transfers, credit and debit cards are all acceptable methods of payment.
Total pay applies to hourly, weekly, or daily pay plans used in place of overtime pay.
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At a site owned by Company X, it is decided to remediate a plume using a double trench system as shown below. A plume lies between the two trenches in a sand layer that is capped by a relatively impermeable clay layer. Nutrient and oxygen laden water will be injected in the trench on the right. The water will flush from right to left and be pumped out of the left trench. To ensure maximum biodegradation, it is best if the sand layer stays saturated. Thus, the trench on the left will be pumped just enough to keep the sand layer saturated. The trench on the right will be kept as full as possible. For the sand layer, assume than n = 0.35 and k = 0.01 cm/s.
(not to scale)
90 ft
2 ft
Clay
10 ft
Plume
Bedrock
a) For a one ft thick slice of the sand layer, how much water would need to be pumped to flush through one pore volume?
b) How long would it take (in days) to pump five pore volumes of water through the sand?
Check out Erich Maria Remarque's All Quiet on the Western Front for first-person tales of the pain experienced during trench warfare (1929).
No man's land, or the western front, was the space between the opposing forces' trenches during World War I. In the First World War, trench fighting was horrifying and terrible. Any attempts to breach and attack the opposite side were typically met with the fire of machine guns, as the forces had dug into trenches facing each other. Check out Erich Maria Remarque's All Quiet on the Western Front for first-person tales of the pain experienced during trench warfare (1929). For first-person stories of the misery experienced during the trench combat, you might want to read Erich Maria Remarque's 1929 book All Quiet on the Western Front.
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Which of the following methods may be used to install new wheel studs?
answer choices
A. Draw in or pull in
B. Draw out or slide in
C. Draw out or push in
D. Draw in or press in
D. Draw in or press in. This method is used to install new wheel studs because it is the most secure and reliable way to install them. The stud is inserted into the wheel hub and then pressed in with a press or hammer.
There are several methods that may be used to install new wheel studs. The most common method is to draw in or press in the stud. This involves inserting the stud into the wheel hub and then pressing it in with a press or hammer. This ensures that the stud is securely in place and will not come loose or move. Another method is to draw out or slide in the stud. This involves inserting the stud into the wheel hub and then sliding it in until it is flush with the hub. This method is less secure than the press-in method, but it is still effective. Finally, the draw out or push in method involves inserting the stud into the wheel hub and then pushing it in until it is flush with the hub. This method is the least secure of the three, but it is still effective.
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Nth root
Assign outValues with the nth root of the inValues. The root is specified by rootValue.
rootValue √ inValue Ex: If inValues is [4, 9, 16, 25] and rootValue is 2, then outValues = [2, 3, 4, 5]
This question uses a loop to iterate through an array and the Math.pow() method to calculate the nth root of a number.
The rfequired details for nth root of a number in given paragraph
Let outValues = [];
for (let i = 0; i < inValues.length; i++) {
out Values. push(Math.pow(inValues[i], 1/rootValue)); }
How do you find the nth root of a number?
The steps for this process are as follows:
1. Declare a variable called outValues and set it equal to an empty array.
2. Use a for loop to loop through the elements in the inValues array.
3. Inside the loop, use the Math.pow() method to calculate the nth root of the element in inValues.
4. Push the result of the Math.pow() method to outValues.
5. After the loop, outValues should now contain the nth root of each element in inValues.
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compare distributed database design strategies with respect to reliability, expandability, communications, overhead costs, manageability, and data consistency.
A distributed database refers to a database management system in which all databases are not connected on the same server.
What are the characteristics of distributed database?In comparison to centralized databases, distributed databases are more reliable. In the event of a database failure in a centralized database, the system comes to a halt. When a distributed database fails, the system continues to function, albeit with reduced performance until the problem is resolved.DDBMS's primary function is to keep track of data distribution, fragmentation, and replication by expanding the DDBMS catalog.Every read, regardless of which node it comes from, returns the data of the most recent write. Network failure is unavoidable in a distributed database, and a database must ensure that it can continue to run even if a partition fails.Often, expensive software is required to ensure data transparency and coordination across multiple sites.A distributed database management system (DDBMS) that is centralized manages distributed data as if it were stored in a single physical location. Data storage on-site lowers communication costs for data manipulation in distributed databases. In centralized databases, local data storage is not possible.To learn more about distributed database refer to :
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A check that is made payable to a specific person is
Group of answer choices
a special endorsement
a blank endorsement
a restrictive endorsement
none of the above
A special endorsement is a check made payable to a specific person. A special endorsement is another type of check endorsement that is used by a payer to give the check to a specific individual.
What is special endorsement?
The following are the special endorsement instructions: "Pay to the order of [recipient's name]," then sign below. It is possible to pay someone else with a check made out to you. In essence, you are transferring the funds associated with the check from the payee to someone else. This is referred to a special endorsement. If a check or check draft is returned due to a missing endorsement, it is because the depositor did not endorse the item, not the account holder who issued the check.
An endorsement is indeed a signature or stamp that appears on a back side of the check.
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The von Neumann bottleneck:
A. was first invented by John Atanasoff.
B. describes the single processor-memory path.
C. is eliminated when multiple processors/cores are used.
D. creates collisions on an I/O bus.
The von Neumann bottleneck is describes the single processor-memory path.
What is single processor-memory?A single processor system contains only one processor. So only one process can be executed at a time and then the process is selected from the ready queue. Most general purpose computers contain the single processor systems as they are commonly in use.As in the above diagram, there are multiple applications that need to be executed. However, the system contains a single processor and only one process can be executed at a time.Multiprocessor Systems. Description. The name itself is saying that the single processor system contains only one processor for processing. For this also the name itself indicates that the multiprocessor system contains two or more processors for processing.To learn more about multiprocessor refer to :
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what are the differences between a regular operating system and a real time operating systems? g
Real-time operating systems are made to execute vital applications dependably and at precisely the right moment, in contrast to operating systems like Windows.
What is the same between a real-time system and an actual operating system?When time restrictions are set and closely adhered to, real-time operating systems are used. It implies that there is very little time for consideration and action. Additionally, the system must do the work within a certain amount of time or else it will fail.Real-time operating systems, like VxWorks, vary from non-real-time operating systems like Windows and Linux in that they have fast guaranteed interrupt latencies and thread preemption times.Real-time operating systems are made to execute vital applications dependably and at precisely the right moment, in contrast to operating systems like Windows, which are made to keep user responsiveness when multiple programmes and services are running (ensuring "fairness").To learn more about operating system refer to:
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on farm tractor how do you determin whether you have a fautlty aitrnator or voltage regulator in your farm tractor
To determine whether you have a faulty alternator or voltage regulator in your farm tractor, you should first check the battery voltage.
A healthy battery should have a voltage of 12.6 volts or higher. If the voltage is lower than 12.6 volts, then you should inspect the alternator and voltage regulator for any signs of damage or wear.
Additionally, you can use a multi-meter to test the voltage output from the alternator and voltage regulator to determine if they are working correctly. If the voltage output is not within the correct range, then the alternator or voltage regulator may be faulty and need to be replaced.
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In the following Python commands, what does the 0.99 represent?import scipy.stats as stst.norm.interval(0.99, 0.50, 0.05)Question 2 options:confidence levelstandard errorproportionmean
Python program to calculate the confidence interval given the values of Standard error of the proportion, the arithmetic mean, and the standard deviation. Correct answer: Standard Error of the Proportion.
What is the standard error of the proportion of a statistical sample?It is a critical value that determines the limit of values, that is, those that are inside or outside the acceptance region, thus defining the limits of a confidence interval. Below is an example in python code.
Python codeimport numpy as n
from scipy import stats
# Standard Error of the Proportionstandard_error = 0.99
# arithmetic averagearithmetic_average = 0.50
# sample standard deviationsample_standard_deviation = 0.05
# calculating confidence intervalconf_int = stats.norm.interval(standard_error, arithmetic_average, sample_standard_deviation)
# Outputprint("Standard Error of the Proportion: ",standard_error)
print("Arithmetic average: ",arithmetic_average)
print("Sample standard deviation: ",sample_standard_deviation)
print("Confidence interval: ",conf_int)
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you may pass on the right of another vehicle: when traveling either on a multilane highway or on a street with an available turning lane. only when traveling on a multilane highway with two or more lanes of traffic traveling in the same direction. only when the other vehicle is making or is about to make a left turn and a lane is provided for you to pass on the right.
You may pass on the right of another vehicle when traveling either on a multilane highway or on a street with an available turning lane. Passing on the right is only allowed when there is an available lane for you to pass in.
When traveling on a multilane highway with two or more lanes of traffic traveling in the same direction, you may pass on the right of another vehicle if there is an available lane for you to pass in. When traveling on a street with an available turning lane, you may pass on the right of another vehicle if the other vehicle is making or is about to make a left turn and a lane is provided for you to pass on the right. It is important to note that passing on the right is only allowed when it is safe to do so. You should always check your mirrors and blind spots before passing on the right, and you should always use your turn signal to indicate your intention to pass. Additionally, you should always be aware of the speed limit and other traffic laws when passing on the right.
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determine the pressure at the deepest part of lake tahoe. the lake's surface elevation is 6225ft, assume that the conditions of the us standard atmosphere prevail at surface of the lake
Two conclusions can be inferred from the posed query, The distance from Lake Titicaca's surface to its deepest point is -922 feet.
The lake's deepest point is 11542 feet above sea level. Every distance above sea level is positive, and every distance below sea level is negative. Since the lake's lowest point is above sea level and its surface is above it, the Surface will therefore also be above sea level. Lake surface elevation is equal to the sum of the distance from the sea level to the deepest point in the lake and the distance from the surface to that point. = 11542 + 922. = 12464 feet. This means that the lake's elevation above sea level is 12464 feet. Two conclusions can be inferred from the posed query, The distance from Lake Titicaca's surface to its deepest point is -922 feet.
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Your manager is interested in looking at the number of engineers in different service lines across the business. Based on the data provided, what is the ratio of construction engineers to civil engineers?
Answer:
The answer is 1 to 2.44
I hope it helps.
part 1. implementing basic combinational logic gates on the de10-lite board following the example given in part 0, create a new project and implement some logic gates of your choice using the switches, buttons, leds and 7-segment displays on the de10-lite board. download your design and verify proper operation. there are many possible design options. a few examples are 2-, 3- or 4-input and, nand, or, nor gates. you could also use a pushbutton to directly control an led or segment of a 7-segment display. note that the segments of the 7-segment display are active-low, as shown in figure 9, and bit 7 corresponds to the decimal point. for example, in order to turn off all the segments of the hex0 7-segment display and keep them off, you could use the following assign statement:
The truth table is the main tool to capture logical relationships in a concise and universal way.
What is a segment?
A segment is a customer Data Platform (CDP), which means it provides a service that simplifies the collection and use of user data from your digital assets (websites, applications, etc.). Thanks to Segment you can collect, transform, send and store your data. By incorporating new tools, the lets you spend more time consuming data and less time collecting it. You can also enrich the collected customer data by combining data from other tools and then aggregating it to monitor performance, make decisions and create unique, personalized user experiences.
You can also use Profile, the Segment Identity Recognizer, which allows you to unify individual user data for a holistic understanding of their activities.
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your company is confused and needs your technical assistance. they have given you different scenarios and want to know if they should use a spreadsheet or a dbms. analyze each situation and select either dbms or a spreadsheet.
Statistical Comparisons Select Worksheet 2. Complex DBMS Queries 3. Summary Report Select 4. Calculations Select v 5. Mortgage Calculations Select 6.
What is a DBMS?
Data management Select V 7. DBMS inventory control 8. Data security control Select 9. Small DBMS data storage V 10. Class selection Grade calculation. A database management system (or DBMS) it is essentially nothing more than a computerized data storage system. System users have the ability to perform various types of operations on this system to manipulate database data or manage the structure of the database by yourself. Database management systems (DBMS) are classified according to their data structures or types. There are several types of databases that can be used on a mainframe to take advantage of z/OS®: inverted list, hierarchical, network or relational. Mainframe sites typically use a hierarchical model, if a data structure ( not the data values ) the data required by the application is relatively static.
For example, a BOM database structure always contains a top-level assembly part number and multiple levels of components with subcomponents. The structure typically includes component forecasts, cost and price data, etc.
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the 2.8-kip load p is supported by two wooden members of uniform cross section that are joined by the simple glued scarf splice shown. determine the normal and shearing stresses in the glued splice.
The normal stress in the glued splice is 0.04 Ksi and the shearing stress is 0.07 Ksi.
The kip load p is supported by two wooden members of uniform cross section that are joined by the simple glued scarf splice. Normal stress and shearing stress are computed as follows:
sin60=5/x
x=5/sin60
A= 3 * x
= 3*5/sin60
=15/sin60
Normal stress will be computed as :
σ =P/A=1.4sin60/A
A= 15/sin60
σ=0.04 Ksi
Shearing stress will be computed as:
τ = Pcos60/A
A= 15/sin60
τ=0.04 Ksi
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every year you have a __% chance of being involved in an automobile accident.
Answer:
3%
Explanation:
the statistic states that 3% of licenced drivers are involved in accidents every year.As a result,the number of active drivers involved in accidents are greater than 3%
usaf europe driving when following another vehicle it is left to your discretion whether or not to dim your high beams to reduce the glare in his or her rearview mirror.
If you are following another vehicle, you have the option to change your bright headlights to low beams in order to prevent blinding the driver.
It's critical to keep the driver of the car you're following in mind whenever you follow another vehicle. Dimming your high lights, if they are on, is one technique to make sure they are safe. This will make it easier for them to see the road because it will lessen the glare in their rearview mirror. Many drivers enjoy the courtesy of dimming high lights since it might allow them to maintain a safe driving environment. However, the decision to do so or not is ultimately up to you. If you believe it to change your bright headlights to low beams in order to prevent blinding the driver.
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consider the following statement, which is intended to create an arraylist named years that can be used to store elements both of type integer and of type string.
The alternative that can be utilized to change the /* missing code */ in order for the statement to compile correctly is.
List of years, The Java programming language is the subject of this query. As can be seen from the query, an ArrayList is involved. In Java, the syntax to declare an ArrayList with no specific data type is as follows: ArrayList [Name of the Lists] = new ArrayList(); The list name is now "years" in the query. Thus; The appropriate statement to replace any missing code in order to avoid mistakes is; ArrayList years is a replacement option that can be used to fill in any missing code, ensuring that the statement compiles successfully. Simply put, resizable arrays are ArrayLists. The statements (b) new ArrayList() and (c) I and III only are capable of substituting for the missing code, respectively. ArrayList creation syntax is as follows: new ArrayListType>() using the argument ArrayListType> str;
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what makes social engineering such an effective technique for hackers?
Social engineering is an effective technique for hackers because it exploits human interaction and psychology to gain access to sensitive information and systems.
What are the key components of a successful social engineering attack? The key components of a successful social engineering attack include psychological manipulation, research, and execution. Psychological manipulation involves using tactics such as authority, fear, flattery, or urgency to influence the target’s decision-making. Research involves gathering information about the target, such as their job title, interests, and habits. This enables the attacker to tailor their approach to the target and to create a sense of familiarity or trust. Finally, execution requires carrying out the attack with a well-crafted message, often via email or phone. The message should be tailored to the target, and should be clear, concise, and persuasive. Additionally, the attacker should be confident, friendly, and persistent. With these components, a successful social engineering attack can be carried out.To learn more about social engineering refer to:
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If I ue proper in-text citation and reference along with quotation mark for direct quote, I will not be plagiarizing.
You are not engaging in plagiarism if you have accurately cited the source when paraphrasing or quoting. However, using the right word is essential. You must abide by the rules of your chosen citation style (such as APA or MLA) to prevent plagiarism.
Do I need to cite the source when using a straight quotation but not a paraphrase?
According to some pupils, a source should only be cited when a direct quote is used. That's not right at all! Just because you put someone else's idea into your own words doesn't make it your own creation. Even if you paraphrase, the original author must still be given credit.
I'll also paraphrase: You are still plagiarizing if you change the order of words or concepts from the original source and incorporate parts of your own words mixed in with the original ones, even if you cite the source.
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Resolve the force F1 into components acting along the u and v axis and determine the magnitude of the components.
The magnitude of the components of F1 is:
F1v= 129 N F1u= 183 NTo solve this exercise we need to draw the vector components for F1 and in this way we can express the F1 vector in function of its components:
F1= F1v + F1u
Now using the Sine law we can find the F1v and F1u values:
The sine lawThe sine law states that the ratio of the length of any side of a triangle to the sine of its opposite angle is equal for all sides and angles of the triangle.
In other words, for any triangle ABC, the ratio of side a to the sine of angle A is equal to the ratio of side b to the sine of angle B, and the ratio of side c to the sine of angle C. This law is an important tool in trigonometric calculations and is used to calculate the unknown sides and angles of a triangle when given the known sides and angles.
F1v/sin(30°) = 250/Sin(105°)
F1v= 129 N
F1u/Sin(45°) = 250/Sin(105°)
F1u= 183 N
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fill in the blank. g today, it can be difficult to choose the best material for a given application because: today, it can be difficult to choose the best material for a given application because:___we have so few different materials from which to choose.___we have so many different materials from which to choose.
Identify product design requirements, Identify product element design requirements, Identify potential materials.
What is mean by materials?The term "material" describes something that is used to create another item. Cloth or any other item made of matter that exists in the physical world can be referred to as material. As a noun and an adjective, "material" has numerous more meanings.
Any substance used to create an object is referred to as a material. Different materials include clay, glass, paper, wax, air, water, and chalk. Matter is the basis of all materials.
The choice of materials is a crucial component in product creation. A suitable material must satisfy a number of fundamental requirements, including effective manufacturability, performance, dependability, non-degradability, and recyclability.
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first, place each link in the chain of infection with its example. second, correctly order the examples, with the first stage at the top.
First, place each link in the chain of infection with its example in the following order, with the first stage at the top:
SourceMode of TransmissionPortal of ExitPortal of EntrySusceptible HostSecond, correctly order the examples, with the first stage at the top:
Source: Person with the disease.Mode of Transmission: Physical contact with an infected person.Portal of Exit: Lungs, saliva, or other bodily fluids.Portal of Entry: Inhaling droplets or touching a contaminated surface.Susceptible Host: Person who has not been exposed to the pathogen.Learn more about the chain of infection:
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FILL IN THE BLANK. Traditional file systems use ________, files, and documents.
Traditional file systems use directories, files, and documents. Directories are used to organize files and documents into a hierarchical structure.
Files are the actual data stored in the file system, and documents are the files that contain text or other information. Directories are used to organize files and documents into a hierarchical structure, which makes it easier to find and access the data stored in the file system. Files are the actual data stored in the file system, and documents are the files that contain text or other information. Documents can be used to store text, images, audio, video, and other types of data. Directories are organized into a hierarchical structure, with each directory containing one or more subdirectories. Each subdirectory can contain files and documents, and each file and document can contain data. The hierarchical structure of the file system makes it easier to find and access the data stored in the file system.
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the first step in checking the operation of the brake pad wear indicator system is to: group of answer choices check that the sensor or scratcher is not too close to the rotor. research the service information to determine the type of brake pad wear indicator system that is used. check that the sensor is grounded with a test lead. test the system.
The first step in checking the operation of the brake pad wear indicator system is to research the service information to determine the type of brake pad wear indicator system that is used.
Different types of brake pad wear indicator systems use different types of sensors or scratchers, and it is important to know which type of system is being used in order to properly check its operation. Once the type of system is known, the next step is to check that the sensor or scratcher is not too close to the rotor. If the sensor or scratcher is too close to the rotor, it may not be able to detect the wear of the brake pads. Additionally, the sensor or scratcher should be checked to ensure that it is properly grounded with a test lead. Finally, the system should be tested to ensure that it is functioning properly. This can be done by applying the brakes and checking the operation of the indicator light or other warning system. If the system is functioning properly, the indicator light or other warning system should activate when the brake pads are worn.
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a small air compressor operates on a 2.3 hp (horsepower) electric motor for 8.2 hours a day. how much energy is consumed by the motor daily? 1 hp equals about 750 watts. answer in units of j. 005 (part 2 of 2) 10.0 points if electricity costs 21 cents per kilowatt-hour, how much does it cost to run the compressor each day? answer in units of cents
The daily operating expense for the compressor is 50922000J.
Multiplying 2.3 * 750 to get 1725 watts per second by 8.2 hours (8.2 * 3600) to get 50922000 J.
Excellent. Part 2 follows:
Therefore, for 8.2 hours, your motor operates at 1725 W (or 1.725 kW).
Analyze the units. We possess kilowatts. KWH is what we need. Multiply together!
At a cost of $0.22 per kWh, 1.725 x 8.2 = 14.145 kWh equals:
14.145 * .21 = $2.97
3600000 J is equal to 1 kilo Watt hour times 3600 seconds, or 21 cents for 3600000 Jules of energy.
All day long, we utilized Jules, therefore 50922000 / 3600000 *.21 = $2.97
E = 2.3 hp*750 watts*60seconds*60minutes*8.2hours = 50922000J
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The compressor's daily operating cost is 50922000J.
How much does it cost per day to operate the compressor?
8.2 hours (8.2 * 3600) divided by 2.3 * 750, or 1725 watts per second, yields 50922000 J.
Excellent. Following is Part 2:
Thus, your motor runs at 1725 W for 8.2 hours (or 1.725 kW).
Investigate the units. Kilowatts belong to us. What we require is KWH. multiply by two!
1.725 x 8.2 = 14.145 kWh at a price of $0.22 per kWh equals:
14.145 * .21 = $2.97
One kilo Watt hour times 3600 seconds is 3600000 J, or 21 cents for 3600000 Jules of energy.
We used Jules all day long, therefore 50922000 / 3600000 *.21 = $2.97
E = 2.3 horsepower * 750 watts * 60 s * 60 m * 8.2 hr = 50922000J
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A brass rod 100 mm long and 5 mm in diameter extends horizontally from a casting at 200oC. The rod is in air with T?=20oC and h=30 W/(m2 K).
a. What is the temperature of the rod at 25, 50, 75, and 100 mm from the casting? Assume that the fin tip is approximately adiabatic.
b. What is the rate of heat transfer from the fin?
c. What would be the rate of heat transfer from a 5 mm diameter circle of the casting surface
without a fin?
The temperature distribution is the result of the linear heat flow equation [1]: (1) T t = 2 T x 2, where T=T(x,t) is the temperature at a point in space -time(x ,t) and is the thermal diffusivity Answer: 156°C, 128°C and 106.5°C
What is the temperature distribution?
Where L is the length (100mm = 0.
1 m), x is the distance from the rod end, k is the conductivity of the brass, i.e. 133 W/m.
m = (hp/kAc) 1/2
circumference, p = π*D, where D is the diameter (5 mm = 0.
005m) to Pole, Ac = π*D2/4
m = (hp/kAc) 1/2
m = 13.43 m (-1)
m = 13.
43 m⁻1
Nota :
coshmL = cosh(13,43*0,1) =
h/mk = 30/(13.43*133) = 0.0168
Tb is the difference between casting temperature and ambient temperature: Tb = 200 - 20 = 180°C
p Then T ∞
Trod = 106.5 °C
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