1. water and air are separated by a plane wall. it is proposed to increase the heat transfer rate by adding adding straight rectangular fins to the wall. the fins have 1.27 mm thickness and 3.0 cm length. the fins are spaced 1.27 cm apart from each other. the air-side and water-side heat transfer coefficients are assumed constant and have the values 11.4 w/(m2 k) and 256 w/(m2 k), respectively. the thermal conductivity of the fins is 42.9 w/(m k). you may assume the steel wall is so thin that any resistance to conduction it produces is negligible. determine the percent change in total heat transfer when the fins are placed on (i) the water side, (ii) the air side, and (iii) both sides. briefly explain why it is more effective to have the fins on the air side.
Answers
i) Total heat transfer when the fins are placed on the water side is 75.7%.ii) Total heat transfer when the fins are placed on the air side is 91.2%.iii) Total heat transfer when the fins are placed on both sides is 166.7%.
What is heat transfer ?
Heat transfer is the process of thermal energy being exchanged between two systems or objects of different temperatures. In other words, heat transfer is the transfer of thermal energy from one object or system to another. Heat transfer occurs in three ways: by conduction, convection, and radiation. Conduction is the transfer of heat through direct contact between two objects, while convection is the transfer of heat through the movement of fluids, such as air or water. Finally, radiation is the transfer of heat through electromagnetic waves, such as light.
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Related Questions
In a vehicle with front disc brakes, the vehicle pulls to the left when braking. What causes this?
A. Seized left brake caliper piston
B. Collapsed left brake line hose
Answers
For binary flash distillation, we discussed in class that there are 8 variables (F, ZA, V, ya, L, XA, P and T) and 4 equations derived from VLE and mass balances. Thus, we typically require 4 of these variables to be given so that we can obtain a unique solution to the problem. Let's say, your manager tells you that he has a feed mixture with 2 components (given F, za) and he requires you to come up with a flash column that can produce a certain desired amount of Vapor product (thus V, ya are specified). Identity of both components is known and all VLE data has been provided to you. Has the manager given you enough data? If yes, give a step-by-step description of how would you go about designing the flash column (basically find P and T)? If no, why?
Answers
Answer:
yes
Explanation:
ooooooooooooooooooooooooooooooo
The best way to check the efficiency of individual cylinders is:________.
Answers
Answer:
To run. The machine one at a time
Explanation:
Need clear written step by step answers please.
Trimble R3 GPS system has an accuracy of + (5 mm + 1 ppm) in the vertical direction. What is the accuracy we are expected to get in the vertical direction for the location of a point that is 5 km away from the reference station? Assume that no other types of errors exist.
Answers
The expected accuracy in the vertical direction for a point located 5 km away from the reference station using the Trimble R3 GPS system, assuming no other errors, is approximately 6.5 mm.
The accuracy of the Trimble R3 GPS system in the vertical direction is given as + (5 mm + 1 ppm). Let's break down this accuracy specification. The "+ (5 mm + 1 ppm)" part means that there is a fixed error of 5 mm added to a proportional error that depends on the distance. The "1 ppm" stands for one part per million, which means the proportional error increases by 1 ppm for every 1 million units of distance.
To calculate the expected accuracy for a point 5 km (or 5,000 meters) away from the reference station, we need to consider both the fixed and proportional errors. The fixed error of 5 mm remains constant regardless of the distance. The proportional error can be calculated by multiplying the distance by the ppm value: (5,000 meters * 1 ppm) = 5 mm.
To find the overall expected accuracy, we add the fixed error and the proportional error: 5 mm + 5 mm = 10 mm. Therefore, the expected accuracy in the vertical direction for a point located 5 km away from the reference station using the Trimble R3 GPS system, assuming no other errors, is approximately 10 mm or 0.01 meters.
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Nec ________ covers selection of time-delay fuses for motor- overload protection.
Answers
Nec Article 430 covers selection of time-delay fuses for motor- overload protection.
What article in the NEC covers motor overloads?Article 430 that is found in National Electrical Code (NEC) is known to be state as “Motors, Motor Circuits and Controllers.” .
Note that the article tells that it covers areas such as motors, motor branch-circuit as well as feeder conductors, motor branch-circuit and others.
Therefore, Nec Article 430 covers selection of time-delay fuses for motor- overload protection.
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when there are requirements to the manner and look of a contract, it is considered a(n) _____
Answers
When there are requirements to the form and appearance of a contract, it is considered a formal contract. Formal contracts have specific requirements and must follow certain legal formalities to be valid and enforceable. This may include the presence of witnesses, the signature of all parties involved, and the inclusion of specific clauses and terms.
It is important to note that a formal contract is not always the best option, and that there are situations where an informal contract may be more appropriate. Informal contracts can be equally valid and enforceable, although they may be more difficult to prove in case of disputes or breach.
In general, the choice between a formal or informal contract will depend on the specific circumstances of the agreement and the needs of the parties involved. If it is a complex or high-risk agreement, or if the agreement is expected to be of long duration, it may be more appropriate to opt for a formal contract to ensure greater legal protection.
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If you are exposed to potentially infectious material via a sharps injury, what should you do immediately?
select the best option.
get the blood tested before washing it away.
report the injury.
wash the area with soap and water.
blot the area with a dry tissue.
Answers
Answer:
Soap and water
Explanation:
then report the injury....
When modeling an engineering process, the right choice between a simple but crude and a complex but accurate model is usually the _______
Answers
When modeling an engineering process, the right choice between a simple but crude and a complex but accurate model is usually the complex model.
What is the engineering process?Engineers frequently follow a set of phases known as the engineering design cycle when developing useful goods, as well as procedures. This design are being frequently used by the person to create a model through which it can do various structural inputs.
The purpose of this modeling is to solve the complexity of the model as well as to allow a tolerable that can be more reliable.A complicated though the precise model is typically preferable to a simple yet unsophisticated one when simulating an engineering process.
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What is wrong with the following code?
6
print (what is your name?)
Answers
Answer:
pakipic na lang po question nyo para masagot po
Explanation:
please po di ko masyado gets po e
it is simple the title name after all it is just asking your name
Why is it nearly impossible to obtain satisfactory performance from a shunt motor connected to an ac power source
Answers
Answer:
Because the shunt winding consist of a large number of turns,
Explanation:
It is nearly impossible to obtain satisfactory performance from a shunt motor connected to an ac power source because the shunt winding consist of a large number of turns, due to the high number of turns that the DC shunt motor has it develops a high impedance when connected to an ac power source. and due to this high impedance the amount of current that flows through the field will be very low making it nearly impossible for the shunt motor to operate properly
Loads resulting from the environment that the structure is located in.
Answers
It's crucial to carefully assess the environment and potential loads when planning and constructing any type of building or infrastructure.
Loads resulting from the environment that the structure is located in refer to various natural forces and elements that can impact the stability and safety of the structure. These loads can include wind, seismic activity, snow and ice, temperature changes, moisture, and soil conditions. It's important for engineers and architects to consider these environmental factors when designing and constructing buildings and other structures to ensure that they can withstand these loads and remain structurally sound. The structure's location and surroundings play a significant role in determining the nature and intensity of these loads, and the content loaded into the structure can also have an impact.
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File Processing Object
Python
Complete the script below to do the following:
1) Add your name, date, assignment number to the top of this script
2) Create a class named FileProcessor
a) The Init method shall:
i) verify the file exists
ii) Extract key file system metadata from the file
and store them as instance attribute
i.e. FilePath, FileSize, MAC Times, Owner, Mode etc.
b) Create a GetFileHeader Method which will
i) Extract the first 20 bytes of the header
and store them in an instance attribute
c) Create a PrintFileDetails Method which will
i) Print the metadata
ii) Print the hex representation of the header
3) Demonstrate the use of the new class
a) prompt the user for a directory path
b) using the os.listdir() method extract the filenames from the directory path
c) Loop through each filename and instantiate and object using the FileProcessor Class
d) Using the object
i) invoke the GetFileHeader Method
ii) invoke the PrintFileDetails Method
Note: This must work on WingIDE please.
Answers
Answer:
Explanation:python
Copy code
# Name: [Your Name]
# Date: [Current Date]
# Assignment Number: [Assignment Number]
import os
class FileProcessor:
def __init__(self, file_path):
if os.path.exists(file_path):
self.FilePath = file_path
self.FileSize = os.path.getsize(file_path)
self.MACTimes = os.path.getmtime(file_path)
self.Owner = os.stat(file_path).st_uid
self.Mode = os.stat(file_path).st_mode
else:
raise FileNotFoundError("File does not exist.")
def GetFileHeader(self):
with open(self.FilePath, 'rb') as file:
self.FileHeader = file.read(20)
def PrintFileDetails(self):
print("File Path:", self.FilePath)
print("File Size:", self.FileSize)
print("MAC Times:", self.MACTimes)
print("Owner:", self.Owner)
print("Mode:", self.Mode)
print("Header (Hex Representation):", self.FileHeader.hex())
# Demonstrate the use of the FileProcessor class
directory_path = input("Enter the directory path: ")
# Extract filenames from the directory path
filenames = os.listdir(directory_path)
for filename in filenames:
file_path = os.path.join(directory_path, filename)
try:
file_processor = FileProcessor(file_path)
file_processor.GetFileHeader()
file_processor.PrintFileDetails()
print("---------------------------------------")
except FileNotFoundError:
print(f"File '{filename}' does not exist.")
Note: Make sure to replace [Your Name], [Current Date], and [Assignment Number] with your actual information. Also, ensure that the code is properly indented as per Python syntax requirements.
This script creates a class FileProcessor that handles file operations. The __init__ method verifies the existence of the file and extracts key file system metadata, such as file path, size, MAC times, owner, and mode, which are stored as instance attributes. The GetFileHeader method reads the first 20 bytes of the file and stores them as the instance attribute FileHeader. The PrintFileDetails method prints the metadata and the hexadecimal representation of the header.
The script prompts the user for a directory path, extracts the filenames using os.listdir(), and then iterates through each filename. For each file, it creates an instance of the FileProcessor class, invokes the GetFileHeader method, and then prints the file details using the PrintFileDetails method.
Please note that this code is designed to work on WingIDE. If you are using a different IDE or environment, you may need to make adjustments accordingly.
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Convenience items like liquid egg are a lot more expensive?
True
Or False
Answers
Answer:
True
Explanation:
It's just because of the processing
trevor moves a magnetic toy train away from a magnet that cannot move. what happens to the potential energy in the system of magnets during the movement?
Answers
Answer:a
Ieieksdjd snsnsnsnsksks
What is the attenuation in db for a 4th order low pass filter at a frequency of 10fc, where fc is the filter's corner frequency?
Answers
Fourth-order Low Pass Filter If the gain of both filters is set at 1.586, the voltage gain will be down 6 dB at the cutoff frequency. We can get a more flat response by choosing different values of voltage gain for both stages.
What is a fourth order low pass filter ?It is possible to create a 4th order low-pass filter with just one Op Amp. Due to the interconnected nature of all filter parameters, component tolerance sensitivity needs to be confirmed. The 4th order Sallen-Key topology is too sensitive to component tolerances, making it unsuitable for application.
Formula fc= 1/(2πRC).
How to calculate the attenuation of a low pass filter?The attenuation rate for a low-pass or high-pass filter will be -20 times the filter order, expressed in decibels per decade. A first-order filter, for instance, will attenuate at a rate of -20 dB/decade, but a fourth-order filter will attenuate at a rate of about -80 dB/decade.
Attenuation (dB)= 10 X log(PI/PO)
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For industrial machinery, straight exposed vertical risers of intermediate metal conduit with threaded couplings are permitted if supported at the top and bottom no more than ___ feet apart.
Answers
For industrial machinery, straight exposed vertical risers of intermediate metal conduit with threaded couplings are permitted if supported at the top and bottom no more than 10 feet apart.
As long as they are supported at the top and bottom no more than 10 feet apart, straight exposed vertical risers of intermediate metal conduit with threaded couplings are acceptable for industrial machines. This requirement makes sure that the conduit is stable and well-supported in order to guard against any risks or damage. To ensure compliance and safety when installing industrial gear, it is crucial to follow the precise rules and specifications outlined by local electrical codes and standards.
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1. Discuss how products incorporate aesthetic design and why this appeals to target markets 2. Discuss how the universal design process has impacted engineering design and the impact these expectations will have on the future of product design.
Answers
Explanation:
Remember, to say a product is incorporated with aesthetic design implies that its overall appearance is designed to look beautiful to the eyes of the user/buyer. For example, a clothing company whose target market is mainly focused on women's clothing would need to take into consideration that certain colors like pink, blue, etc are attractive to women more than men. So they'll have to ensure the colors of their clothing are suitable to the needs of their target market.
The Universal Design process involves building products that can be used by a wide range of users at ease. For example, you may ask yourself: Is my product/service easily accesible to those with disabilities?
Other processes include;
Defining who the users (or universe) are of the products. Involve consumers in the design.Follow the existing standards of product designEvaluate and review your universal design methods_____________ processes are actions that create physical solutions to problems.
a
Production Processes
b
Medical Processes
c
Agricultural Processes
d
Communication Process
Answers
Answer:
yes answer d is correct
Communication Process are actions that create physical solutions to problems. The correct option is d.
What is Communication Process?Human existence and organisational survival both depend on effective communication. It is a process of generating and disseminating thoughts, facts, opinions, and sentiments from one place, individual, or group to another. The Management function of Directing depends on effective communication.
The sending party, message encoding, channel selection, message receipt by the recipient, and message decoding are all aspects of the communication process.
Feedback is when the recipient communicates something back to the original sender. These procedures are actions that result in tangible fixes for issues.
Thus, the correct option is d.
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A queue is just a stack turned on its side. True False
Answers
This assertion is untrue because, despite the fact that they both entail storing and retrieving data, a queue and a load are two distinct computerized systems used in computing science and programming.
Stack - what does it mean?A stacked is a logical construction created from a number of connected parts. The expression is commonly used in memory management and computer programming. Programmer platforms are supported by the data abstraction idea known as the last one with first out (LIFO). Push and pop are its two fundamental components.
What does a stack look like?Examples of stacks include a package of Pringles snack chips, a stack of eating dishes, and a pile of books. The fundamental tenet of operation is that the last thing users put into is the first thing you should take out. Stacks are Last In Fifo (LIFO) structures, in other words.
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Assuming you determine the required section modulus of a wide flange beam is 200 in3, determine the lightest beam possible that will satisfy this condition.
Answers
Answer:
W18 * 106
Explanation:
Given that the section modulus of the wide flange beam is 200 in^3 the lightest beam possible that can satisfy the section modulus must have a section modulus ≥ 200 in^3. also the value of the section modulus must be approximately closest to 200in^3
From wide flange Beam table ( showing the section modulus )
The beam that can satisfy the condition is W18 × 106 because its section modulus ( s ) = 204 in^3
what's an air reservoir
Answers
Help, quick please. I need help with my engineering word problem
Answers
Answer:
a
Explanation:
The pressure in a natural gas pipeline is measured by the manometer shown in Fig. 2 with
one of the arms open to the atmosphere where the local atmospheric pressure is 14.2 psia. Determine the absolute pressure in the pipeline.
Answers
Everything you touch is pressed upon by the weighty air that surrounds you. This pressure is referred to as air pressure or atmospheric pressure.
What is Atmospheric pressure?It is the force that the air above a surface applies to it while gravity pulls the surface toward Earth. A barometer is frequently used to measure atmospheric pressure.
A mercury column in a glass tube acts as a barometer, rising or falling in response to variations in the atmosphere's density. By measuring how much the mercury rises, meteorologists can determine the air pressure.
The standard unit of measurement known as one atmosphere (atm) corresponds to the average atmospheric pressure at sea level and 15 degrees Celsius.
Therefore, Everything you touch is pressed upon by the weighty air that surrounds you. This pressure is referred to as air pressure or atmospheric pressure.
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The steel bracket is used to connect the ends of two cables. if the allowable normal stress for the steel is sallow = 30 ksi, determine the largest tensile force p that can be applied to the cables. assume the bracket is a rod having a diameter of 1.5 in.
Answers
The largest tensile force that can be applied to the cables given a rod with diameter 1.5 is 2013.15lb
The static equilibrium is given as:
F = P (Normal force)
Formula for moment at section
M = P(4 + 1.5/2)
= 4.75p
Solve for the cross sectional area
Area = \(\frac{\pi d^{2} }{4}\)
d = 1.5
\(\frac{\pi *1.5^{2} }{4}\)
= 1.767 inches²
Solve for inertia
\(\frac{\pi *0.75^4}{4}\)
= 0.2485inches⁴
Solve for the tensile force from here
\(\frac{F}{A} +\frac{Mc}{I}\)
30x10³ = \(\frac{P}{1.767} +\frac{4.75p*0.75}{0.2485} \\\\\)
30000 = 14.902 p
divide through by 14.902
2013.15 = P
The largest tensile force that can be applied to the cables given a rod with diameter 1.5 is 2013.15lb
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This might count as engineering, I'm not sure as this is IT
An ordered collection of data elements stored and accessed in a program is called what?
Group of answer choices
Variables
List
Locale
Parameters
Answers
Answer:
10.5
Explanation:
Convert to an equation for example P%* X=Y
P is 7.5% X is 140, so the equation Is 7.5 percent * 14= Y
convert 7.5% Into a decimal by removing the percent sign and deviding by 7.5/100= 0.075
Substitute 0.075 for 7.5% in the equation: 7.5%*140=Y becomes 0.075*140= 10.5
please hurry i’ll give you 15 points
Answers
Answer:
measures, dissolves, liquid, carbon dioxide, evaporates, water vapor, mold, decompose
Design the circuit to obtain a dc gain of 20 db, a 3-db frequency of 5 khz, and an input resistance of 2k. Hint: see example 2. 4 in page 88 of our textbook. Write your answer rounding to 2 significant digits. Examples: 0. 35, -2. 4, 13, -920
Answers
Answer: Your welcome!
Explanation:
The circuit to obtain a DC gain of 20 dB, a 3-db frequency of 5 kHz, and an input resistance of 2k is a two-stage amplifier with a common emitter stage and a common collector stage. The first stage has a DC gain of 10 dB, a 3-db frequency of 2 kHz, and an input resistance of 2k. The second stage has a DC gain of 10 dB, a 3-db frequency of 5 kHz, and an input resistance of 10k. The overall DC gain is 20 dB, the 3-db frequency is 5 kHz, and the input resistance is 2k.
A piston-cylinder assembly contains 5kg of water that undergoes a series of processes to form a thermodynamic cycle. Process 1à2: Constant pressure cooling from p1=20bar and T1=360°C to saturated vapor Process 2à3: Constant volume cooling to p3=5 bar Process 3à4: Constant pressure heating Process 4à1: Polytropic process following Pv =constant back to the initial state Kinetic and potential energy effects are negligible. Calculate the net work for the cycle in kJ.
Answers
Answer:
The net work done is 272.38 kJ
Explanation:
The parameters given are;
Mass of water = 5 kg
p₁ = 20 bar
T₁ = 360°C
v₁ = 0.141147 m³/kg
Process 1 to 2 = Constant pressure process
p₂ = 20 bar
Process 2 to 3 = Constant volume process
p₃ = 5 bar
Process 3 to 4 = Constant pressure process
Process 4 to 1 = Polytropic process pv = Constant
For Stage 1 to 2, we have;
p₂ = 20 bar
From the steam tables for superheated steam, we have;
T₂ = 212.385°C
v₂ = 0.0995805 m³/kg
Work done = p₂×(v₂ - v₁) = 2×10⁶ × (0.0995805 - 0.141147 ) = -83133 J/kg
For the 5 kg, we have;
\(W_{1-2}\) = -83133 J/kg × 5 = -415,665 J
Stage 2 to 3: Constant volume cooling
v₂ = v₃ = 0.0995805 m³/kg
p₃ = 5 bar
T₃ = 151.836°C
(0.0995805 - 0.00109256)/(0.374804 - 0.00109256) = 0.2635 liquid vapor mixture
Work done, \(W_{2-3}\) = 0
Stage 3 to 4: Constant pressure heating
p₃ = p₄ = 5 bar
v₄/T₄ = v₃/T₃
v₄ = 0.374804 m³/kg
T₄ = v₄×T₃/v₃ = 0.374804*(273.15 + 151.836)/0.0995805 = 1599.6 K = 1326.4 °C
Work done = p₄×(v₄ - v₃) = 5×10⁵ × (0.374804 - 0.0995805 ) = 137611.75 J/kg
For the 5 kg, we have;
\(W_{3-4}\) = 137,611.75 J/kg × 5 = 688,058.75 J
Stage 4 to 1: Polytropic process
\(\dfrac{p_{4}}{p_{1}} = \left (\dfrac{V_{1}}{V_{4}} \right )^{n} = \left (\dfrac{T_{4}}{T_{1}} \right )^{\dfrac{n}{n-1}}\)
Which gives;
\(\dfrac{5}{20} = \left (\dfrac{0.141147 }{0.374804} \right )^{n}\)
n = log(5/20) ÷log(0.141147/0.374804) = 1.42
Work done, \(W_{pdv}\), is given as follows;
\(W_{pdv} = \dfrac{p_4 \times v_4 -p_4 \times v_4 }{n-1}\)
Which gives;
\(W_{pdv} = \dfrac{5\times 0.374804 -20\times 0.141147 }{1.42-1} = -2.259 \, J\)
For the 5 kg, we have;
\(W_{4-1}\) = -2.259 J/kg × 5 = -11.2967 J
The net work done, \(W_{Net}\), is therefore;
\(W_{Net}\) = \(W_{1-2}\) + \(W_{3-4}\) + \(W_{4-1}\)
-415,665 + 688,058.75 -11.2967 = 272,382.45 J = 272.38 kJ.
Assume that 50,000 yd3 of the soil from a local borrow pit in Rhode Island, with a water content of 13% and dry unit weight of 87 pcf, is to be delivered to a construction site for some repairs of highway in I-95. By the time it reaches the site, the water content is 9%. It will be compacted to a minimum of 90% of the modified Proctor maximum dry density. Determine the total amount of water (in pounds), that must be added to the soil to increase the moisture content to the optimum level. Assume a Gs
Answers
Answer:3000 yd3
Explanation:
so i got the 50000 divided it by 100 times that by 13 and got 4500 yd3
so now the soil is at 9 so i need to get the 4 percent back up so i yet again got 50000 yd3 and divided by 100 and times it by 9 to get 1500 yd3 to then minus my 1500 and 4500 yd3 and got 3000 yd3 i hope it is right.
Hard steering can be caused by
Answers
Answer:
Lack of fluid oil – lack of fluid oil in your vehicle, or a fluid leakage, can lead to heavy steering. If there is a lack of fluid oil, or a leak, this can reduce the pressure in the system, meaning the steering wheel does not receive enough supply of fluid to perform freely.