(15 points) develop a lexer class: (code 10, defintions 5) a. an instant of this class should exist in the complier class b. takes in a string in its constructor c. converts a string into a list of token object if there exist no errors i. should ignore block comments ii. should ignore single line comments
Answers
Here is an example of how you could implement a lexer class in Python:
import re
class Token:
def __init__(self, type, value):
self.type = type
self.value = value
def __str__(self):
return f'Token({self.type}, {self.value})'
class Lexer:
def __init__(self, text):
self.text = text
self.pos = 0
self.current_char = self.text[self.pos]
def error(self):
raise Exception('Invalid character')
def advance(self):
self.pos += 1
if self.pos > len(self.text) - 1:
self.current_char = None
else:
self.current_char = self.text[self.pos]
def skip_whitespace(self):
while self.current_char is not None and self.current_char.isspace():
self.advance()
def skip_comment(self):
while self.current_char != '\n':
self.advance()
self.advance()
def get_integer(self):
result = ''
while self.current_char is not None and self.current_char.isdigit():
result += self.current_char
self.advance()
return int(result)
def get_string(self):
result = ''
self.advance()
while self.current_char != '"':
result += self.current_char
self.advance()
self.advance()
return result
def get_next_token(self):
while self.current_char is not None:
if self.current_char.isspace():
self.skip_whitespace()
continue
if self.current_char == '#':
self.skip_comment()
continue
if self.current_char.isdigit():
return Token('INTEGER', self.get_integer())
if self.current_char == '"':
return Token('STRING', self.get_string())
if self.current_char == '+':
self.advance()
return Token('PLUS', '+')
if self.current_char == '-':
self.advance()
return Token('MINUS', '-')
if self.current_char == '*':
self.advance()
return Token('MULTIPLY', '*')
if self.current_char == '/':
self.advance()
return Token('DIVIDE', '/')
if self.current_char == '(':
self.advance()
return Token('LPAREN', '(')
if self.current_char == ')':
self.advance()
return Token('RPAREN', ')')
self.error()
return Token('EOF', None)
This lexer class takes in a string in its constructor and converts it into a list of Token objects. It ignores block comments by checking for the # character and then skipping everything until the end. Python is a high-level, interpreted language that is widely used for web development, data analysis, artificial intelligence, and scientific computing. It is known for its simplicity, readability, and flexibility, making it a popular choice for beginners and experienced programmers alike.
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Related Questions
Linux help
You've experienced some network connectivity issues, and you suspect the issue may be one of the NICs in your computer.
In this lab, your task is to:
Stop the enp2s1 NIC as the first step to isolating the problem.
Verify that enp2s1 is down.
Answers
Linux command will be: sudo ifdown enp2s1
Why to use enp2s1?This command will stop the enp2s1 NIC and disable it from sending or receiving data on the network.
To verify that enp2s1 is down, you can use the following command:
ip a
This command will display the status of all network interfaces on the computer. You should see enp2s1 listed as "DOWN" if it has been successfully stopped. You can also use the following command to check the status of a specific interface:
ip a show enp2s1
This command will show the status and other information about the enp2s1 interface. If it is down, the status will be listed as "DOWN".
Alternatively, you can also use the following command to check the status of the enp2s1 interface:
ifconfig enp2s1.
This command will show the status and other information about the enp2s1 interface. If it is down, the status will be listed as "DOWN" and there will be no information about the interface's IP address or other network connectivity details.
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construct a 95% two-sided confidence interval on the difference of mean impact strength between these two dyes. assume the variances of the two populations are the same.
Answers
Collect a sample of impact strength measurements for each dye.
What are the steps need to be followed?To construct a 95% two-sided confidence interval on the difference of mean impact strength between two dyes, you can use the following steps:
Collect a sample of impact strength measurements for each dye.Calculate the sample means and sample variances for each dye.Calculate the sample size for each dye, and the combined sample size for both dyes.Calculate the combined sample variance for both dyes. This can be done using the formula:combined variance = ((n1 - 1) * variance1 + (n2 - 1) * variance2) / (n1 + n2)
lower bound = mean1 - mean2 - t * standard error
upper bound = mean1 - mean2 + t * standard error
The resulting interval represents the range of values for the difference in means that are 95% likely to contain the true difference in means for the two dyes.
It is important to note that these steps assume that the variances of the two populations are the same. If the variances are not the same, you may need to use a different method to calculate the confidence interval.
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Number the DOFs and form the stiffness matrix for the show bar system (which has DOFs in the horizontal direction only). Develop the force vector and solve the stiffness equations to find the tip displacement under the given force. Compare your answer to RISA
Answers
When a force is applied, stiffness, which is defined as the resistance of an elastic body to deflection or deformation, can be represented as
k = F /[tex]$\delta$[/tex] (1), where k = stiffness (N/m, lb/in).
What is the formula for stiffness?Where F is the load and is the bending deflection, it has a stiffness of
S = F/[tex]$\delta$[/tex]. When a force, F, is applied to an item, its stiffness, k, is calculated as the product of the force's magnitude and the object's deformation,. The slope of the elastic portion of the stress-strain curve for a particular material is taken into consideration when calculating it by dividing the longitudinal stress by the strain. A material's stiffness is primarily categorized by its modulus of elasticity.
A material's stiffness can be summed up by its Young's modulus, also known as elastic modulus. To put it another way, it is how easy it can be bent or stretched. To be more precise, the mathematics and physical values are calculated as follows: Young's modulus equals stress minus strain.
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A safety zone is a specially marked area for passengers to get on or off of buses or trolleys. You may not drive through a safety zone:When a bus or trolley is present.When a bus or trolley is unloading passengers.At any time for any reason.
Answers
You may not drive through the safety zone specially marked for passengers at any time for any reason.
Why the safety zone on road is important?helping to make the environment safer Drivers approaching places frequented by vulnerable pedestrians, such as the vicinity of a school where children may be crossing roads, using footpaths, or playing nearby, can be alerted by Safety Alert Zones.
What does "road safety" mean?Road safety is the application of techniques and policies to lessen the chance that people using the road network would be engaged in an accident or incident that could result in significant injuries, property damage, or even death.
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The format of URIs allows various more-specialized kinds of resource identifiers to be incorporated into the URI space of identifiers. The first part of a URI is a _________________that names a particular way of identifying a certain kind of resource, such as mailto for email addresses or file for file names. The second part of a URI, separated from the first part by a colon, is the __________________ part.
resource, scheme
scheme, resource
scheme, scheme-specific
resource, scheme-specific
Answers
A URI's first component is a scheme that specifies a specific method of resource identification. The scheme-specific portion of a URI is the second part, which is separated from the first part by a colon.
How many URI components are there?A URI can have up to five components. Only two of these, nevertheless, are required. scheme: provides details on the protocol in use.
What number of agents cause URI?The etiologic agents of URI include bacteria, mycoplasma, viruses, and fungi (Table 93-1). When school starts in the fall and winter, respiratory infections are more prevalent, and indoor congestion makes them more contagious.
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While preparing a software inventory report, a security analyst discovers an unauthorzed program installed on most of the company's servers. The program utilizes the same code signing certificate as an application deployed to only the accounting team. After removing the unauthorced program, which of the following mitigations should the analyst implement to BEST secure the server environment? a. Revoke the code signing certificate used by both prograrns.
b. Block all unapproved file hashes from installation. c. Add the accounting application fite hash to the allowed last. d. Update the code signing certificate for the approved application
Answers
The least expensive certificate for servers that only have internal access is one that is self-signed.
What ought to be listed on a software inventory?Detailed information about the installed software, such as the version number and patch level, should be included in inventories at the very least. For each type of device, resource custodians should compile a list of approved software. The only software required to fulfill company needs should be included in authorized software.
What distinguishes the inventories of hardware and software?Information on memory, operating systems, manufacturers, device kinds, peripherals, and other items are included in the hardware inventory details. Information on the software found in the network is provided by the software inventory, which is organized by volume and software vendors.
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Code example 22-1
import java.util.List;
import java.util.ArrayList;
public class ProductsApp {
public static void main(String[] args) {
List products = new ArrayList<>();
products.add(new Product("java", "Murach's Java Programming", 57.50, 5000));
products.add(new Product("cshp", "Murach's C#", 57.50, 2451));
products.add(new Product("mysql", "Murach's MySQL", 57.50, 473));
// call the filterProducts() method
}
public static List filterProducts(List products, TestProduct condition) {
List filteredProducts = new ArrayList<>();
for (Product p : products) {
// test the product and add to the list if it meets the condition
}
return filteredProducts;
}
}
(Refer to code example 22-1) Given the declaration for the TestProduct() interface that follows, which statement would you use to test the condition specified by the lambda expression that's passed to the filterProducts() method?
public interface TestProduct {
boolean test(Product p);
}
Answers
The statement that I would use to test the condition specified by the lambda expression that's passed to the filterProducts() method is:
if (condition.test(p)) {...}
What is lambda expression?Java 8 introduced lambda expressions. A lambda expression is a brief segment of code that accepts input parameters and produces a result. Lambda expressions are similar to methods in that they can be used directly within the body of a method and do not require a name.
It offers a concise and clear method for expressing a single method interface. It is very helpful in a library's collection. It aids in data extraction, filtering, and iteration from collections.
An interface that has a functional interface is implemented using the Lambda expression. Lots of code is saved. We don't have to define the method again to provide the implementation when using a lambda expression.
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The applied force at point E and the applied couple moment at point D are shown in the figure. Complete calculate the following (Where applicable, express the results as the (x, y, z) components of a Cartesian vector)
7. Sef up the copatices of equilibritm (You mest sbow all relerant equilibrium cojuations one below the other. If you fail to so so, you will not get any credit for this part) (18 points)
8. Calculate the tension in the rope and the reactions at support A. (12 points)
Answers
Substitute an analogous resultant and pair second acting at point O for this force system. Write the findings as Cartesian vectors.
What exactly is a Cartesian idea?The ontological dualism of mind (also known as spirit or soul) with matter was adopted by the Cartesian school. Self-conscious thought is the essence of the mind, while three-dimensional extension is the essence of matter. God is a third, limitless substance, and necessary existence is what makes God who He is.
What makes anything a Cartesian?The Cartesian plane is a plane with such a rectangular coordinate system which assigns each point in the surface with a pair of integers. It is named just after mathematician Rene Descartes (1596–1650).
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High level security concerns for Cloud computing may include: o Work on the tools and controls to put in place first, then take the time to establish your overall security strategy. o Finding ways to overcome the lack of security visibility in the Cloud, especially considering the sheer number of layers, tools and controls. o Effectively managing identity and defining access management, including the privileges and responsibilities of various network admins and users. o Consider the confidentiality aspects regarding your requirements for data encryption in transit and at rest balancing cost and risk. o Requiring the appropriate level of availability should be balanced regarding cost, risk and recovery these may be impacted by physical location and physical access.
o Integration strategy regarding APIs that should include a requirement to implement string encryption, activity monitoring, and access control. o Implementing a cloud-based enterprise will help guarantee regulatory compliance since the "shared responsibility model" makes much easier to meet CCPA, PCI-DSS and GDPR privacy mandates. o Strong cloud security policies can be integrated into the IT processes that teams use to build applications and deploy in the cloud infrastructure.
Answers
As CCPA, PCI-DSS, and GDPR privacy standards are greatly simplified by the "shared responsibility model," implementing a cloud-based enterprise security will assist ensure regulatory compliance.
By limiting other people's options, security is the capacity to tolerate potential harm from them. Security is advantageous to individuals, social groups, things, organizations, ecosystems, and any other phenomenon or institution that is vulnerable to unwelcome change. 2015 saw the assistance of Spanish volunteers in assisting refugees fleeing war and instability in Syria and Iraq to reach Lesbos Island. Security can indicate a number of other things in addition to defending against hostile forces, including the absence of harm, the presence of an essential good, resistance against potential damage or injury, concealment, containment, and even a state of mind. The phrase is sometimes utilized to describe structures and acts.
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Which of the following affect the current carrying capacity of an electrical conductor? (Select the three that apply) O VoltageO Number of wires in the conduit O Insulation type O Material of the conductor O Power
Answers
The following have an effect on the present day sporting ability of an electrical conductor is Voltage, Insulation type, Power.
What is current carrying capacity?The maximum present day (in amperes) that an insulated conductor or cable can constantly deliver with out going over its temperature score is called its present day sporting ability. Amplification is any other call for it.A conductor that includes present day is one which usually conducts electricity.The electric resistance [R] of the electric conductor applied and the temperature that outcomes from that conductor relying on present day and surroundings are the bodily elements that decide a cable's cap potential to transmit present day. The maximum temperature at which the insulation applied is authorized to operate. The common length of a species' populace in a given habitat is known as sporting ability. Environmental factors which include sufficient food, shelter, water, and buddies are proscribing elements for the species populace.To analyze greater approximately present day sporting ability refer:
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a 30-tooth, 12 pd gear has agma standard full-depth involute teeth. calculate the pitch diameter, circular pitch, addendum, dedendum, tooth thickness, and clearance
Answers
The pitch diameter is 12pd = 12/30 = 0.4,The circular pitch is π/0.4 = 7.85,The addendum is 1/0.4 = 2, The dedendum is 1.25/0.4 = 3.125,The tooth thickness is 2.5 - 1.25 = 1.25, The clearance is 0.25/0.4 = 0.625
What is diameter ?
Any straight line segments that cuts through the centre of a circle and has ends that are on the circle is considered a circle's diameter in geometry. It is also known as the circle's longest chord. The diameter of sphere can be defined while using either of the two methods. In more recent usage, the term "diameter" also refers to the length d of a diameter. As opposed to a diameter, which refers to the line segment itself, one uses the term "diameter" in this context since all diameter of a circular or globe share the same length, which is equal to twice the radius r.
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For the full-bridge inverter, the dc source is 125 V, the load is a series RL connection with R = 10 Ohm and L =20mH, and the switching frequency is 60 Hz. (a) Use the switching scheme bellow and determine the value of a to produce an output with an amplitude of 90V at the fundamental frequency. (b) Determine the THD of the load current.
Answers
(a) Using the switching scheme given we have determined the value of ∝ to produce an output with an amplitude of 90V at the fundamental frequency i.e. ∝ = 36.96°
(b) The THD of the load current is = 1.6919
What is amplitude?The maximum displacement or distance made by a point on a vibrating body or wave relative to its equilibrium position is known as the amplitude in physics. It is equivalent to the length of the vibration path divided in half. A pendulum's amplitude is therefore equal to half the distance that the bob travels when swinging from one side to the other. Vibrating sources produce waves, whose amplitude is inversely proportional to the source's amplitude.
The maximum deviation of any point on the string from its position when the string is at rest is used to determine the amplitude of a transverse wave, such as the wave on a plucked string. The maximum displacement of a particle from its equilibrium position is used to determine the amplitude of a longitudinal wave, such as a sound wave.
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Computer Science question
Answers
Answer: а в г
Explanation:
evaluate various types of attacks and select the scenario that simulates a transitive access attack.
Answers
The scenario that simulates a transitive access attack may include an attacker who exploits a weakness in a shopping website in order to mimic an end user and obtain services from a distributor.
What is meant by a transitive access attack?A transitive access attack may be characterized as a type of misuse of trust that causes issues with securing information or control. It attempts to access a back-end server through another server.
A SQL injection attack is an example of a transitive access attack that can bypass many other security controls. For example, if system A trusts B and system B trusts C, then it is possible for system A to inadvertently trust system C, which might lead to exploitation by a nefarious operator on system C.
Therefore, an attacker exploits a weakness in a shopping website in order to mimic an end user and obtain services from a distributor representing a scenario that simulates a transitive access attack.
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describe the change in the bending stress profile for a steel beam cross-section as it transitions from elastic to plastic behavior.
Answers
In the elastic range, the bending stress in a steel beam follows a linear relationship with the applied bending moment.
What is the slope of linear relationship?The slope of this linear relationship is known as the modulus of elasticity of the material.
This means that as the bending moment increases, the bending stress also increases in a proportional manner.
As the beam continues to experience increasing bending moments, it will eventually reach a point where the stress exceeds the yield strength of the material. At this point, the beam will begin to deform plastically, meaning that it will experience permanent deformation.
The stress-strain relationship in the plastic range is no longer linear. Instead, the stress will reach a maximum value, known as the ultimate strength, and then remain relatively constant as the strain continues to increase. This is known as the "plateau" region of the stress-strain curve.
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___________________ is the primary classification trait used to explain how scientists divide rocks into the three classification groups.
answer choices
- Composition
- Formation
- Location
- Texture
Answers
9.6 design the circuit in fig. p9.6 to obtain a dc voltage of 0 v at each of the drains of q1 and q2 when vg1
Answers
Integrated circuit transistors down to large electronic systems can all be included in the circuit design process.
What does circuit design entail?The step of the design cycle where the integrated circuit's schematics are produced is frequently referred to as "circuit design" in integrated circuit design automation. Between logic design and physical design, this is typically the next stage.Integrated circuit transistors down to large electronic systems can all be included in the circuit design process. For simple circuits, one individual can frequently complete the design process without the requirement for a planned or systematic design procedure.
The complete question is,
P9.6 will produce a dc voltage of +0.1 V at each of Q 1's and Q 2's drains when V G1 = V G2 = 0 V. Start all of the transistors.
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Question 9
Most multi-national companies have inherited disparate international systems which are based on outdated concepts of information processing.
True
False
Answers
The answer is true, Most multi-national companies have inherited disparate international systems which are based on outdated concepts of information processing.
What are multi-national companies?
Multinational Corporations (MNCs), also known as Multinational Corporations (MNEs), Transnational Corporations (TNEs), Transnational Corporations (TNCs), International Corporations or, with a subtle but contrasting sense, Stateless Corporations, A business organization that you own and manage. Offering goods or services in at least one country other than your home country. Control is seen as a key aspect that distinguishes multinational corporations from international portfolio investment organisations. B. Some international mutual funds invest in foreign companies solely to spread financial risk. The Black's Law Dictionary suggests that a company or group should be considered a multinational company "if it derives 25% or more of its revenues from operations outside its home country."
The answer is true, Most multi-national companies have inherited disparate international systems which are based on outdated concepts of information processing.
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refer to the exhibit. an engineer issued the ping 192.168.3.100 command from r1, and the ping was successful. are there any routes that would not be verified as working by that successful ping?
Answers
Yes, the static route for 192.168.2.0 is incorrectly configured.
What is a static route?Static routing is a routing method that requires manual configuration. The majority of network managers follow static routing. In areas with consistent network and environmental characteristics, this routing will be heavily used.
Static routing is fixed and unaffected by network changes, in contrast to dynamic routing. It is used on a router to increase routing effectiveness and to act as a fallback in case other data cannot be shared.
It takes advantage of the routes that connect the two routes, which are not immediately updatable. As a result, whenever the network changes, static routes must be manually reconfigured. Compared to dynamic maps, it takes little bandwidth. It can be applied to situations where network traffic is planned and predictable.
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The employee time card for John Winter indicates that he spent last week performing routine maintenance on factory machinery. Payments made to Winter for last week's work should be
Answers
If his employee time card shows that he spent last week performing normal maintenance on industrial machinery, payments for last week's labour should be charged to the Manufacturing Overhead account.
What is a timecard for employees?A time card, often known as a timesheet, is a tool for keeping track of how much time an employee spends on each task. Utilizing a time card enhances project execution, decision-making, and labour and governmental regulations compliance.
What does a time card serve as?The time an employee starts and stops working is often printed on the card when it is entered into a time clock. The payroll team uses it to determine how many hours an employee will be paid for.
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Assignment 1."Value chain analysis is not a very difficult exercise conceptually"Clarify 2.Supply Chain Management drives supply chain members to have a customer orientation, Explain 3.A typical supply chain may involve a variety of
Answers
A typical supply chain may involve a variety of stages such as:
(i) Customers.
(ii) Retailers.
(iii) Wholesalers/Distributors.
What is a supply chain?A supply chain is a group of people and businesses involved in producing and distributing goods to customers.
The supply chain is the network of all the people, businesses, resources, tasks, and technological advancements involved in the production and distribution of a good. An entire supply chain, from the delivery of raw materials from the supplier to the manufacturer to the final delivery to the customer, is included.
Therefore, the typical supply chain may involve a variety of stages such as Customers, Retailers and Wholesalers.
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Suppose that Brussels sprouts are the main ingredient in Ronni's Vegan Dog Treats. Suppose further that the productivity of dog treat workers increases while, at the same time, the number of buyers of vegan pet food decreases. Everything else held constant, the equilibrium price of dog treats will and the equilibrium quantity of dog treats transacted will Select one. O A decrease; be ambiguous OB.increase; be ambiguous 6. be ambiguous, decrease OD, increase, decrease E. decrease increase F. be ambiguous increase Gincrease increase H. decrease; decrease
Answers
Suppose that Brussels sprouts are the main ingredient in Ronni's Vegan Dog Treats. Suppose further that the productivity of dog treat workers increases while, at the same time, the number of buyers of vegan pet food decreases. Everything else held constant, the equilibrium price of dog treats will decrease and the equilibrium quantity of dog treats transacted will be ambiguous.
What is ambiguous?
It's meaning is: doubtful or uncertain especially from obscurity or indistinctness
Like many words in English, vague has multiple meanings. A quality that some might call ambiguous. The word can mean ``doubtable or uncertain, especially because of obscurity or ambiguity'', ``understandable in two or more possible meanings or ways'', and ``inexplicable''.
Latin The prefix ambi- means "both" and has misled many people into vague and ambiguous beings. Ambivalent refers to having mixed, conflicted, or multiple feelings about something (his second part of this word comes from the Latin valere, "strong, worthy"). Ambiguous, on the other hand, means unclear or many times intelligible (partially derived from the Latin agere, "to drive").
Suppose that Brussels sprouts are the main ingredient in Ronni's Vegan Dog Treats. Suppose further that the productivity of dog treat workers increases while, at the same time, the number of buyers of vegan pet food decreases. Everything else held constant, the equilibrium price of dog treats will decrease and the equilibrium quantity of dog treats transacted will be ambiguous.
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p16.5 the magnetic field produced in the air gap of an induction motor by the stator windings is given by b
Answers
B=Bmcos(t2) is the formula for the magnetic field an induction motor's stator windings produce in the air gap.
Explain about the magnetic field?In a magnetic field, a moving charge experiences an external force that is perpendicular to the magnetic field and has its own velocity.
Magnetism is produced by how electric charges flow. All substances are made up of tiny units called atoms. The tiny electric-charged particles known as electrons are found inside every atom. An atom's nucleus, or core, is surrounded by electrons that spin like tops.
The magnetic field around a permanent magnet or a wire carrying a continuous electric current in one direction is stationary and is known as a magnetostatic field. Its direction and magnitude are constant at any given site.
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The front rotors are removed from a vehicle. The surface face on both rotors have small cracks and appear to have a blued finish. The brake rotors should be:
Answers
The front rotors are removed from a vehicle. The surface face on both rotors have small cracks and appear to have a blued finish. The brake rotors should be: discarded
When should brake rotors be discarded?Only around 1 or 2 millimetres of rotation of a rotor is possible before it is too thin to be used safely and must be discarded and replaced. Repeatedly overheated brake rotors may deform and cause a vibration in the wheel. Your tyres and suspension system will endure substantial wear and tear from this warping.The thickness at which a rotor should be changed is its discard thickness. Discard thickness is often understood to be a parameter that is connected to heat. It is commonly accepted that a rotor cannot disperse heat if it is at or below the discard thickness.Learn more about Brake unit refer to :
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we can obtain the banker's algorithm for a single resource type from the general banker's algorithm simply by reducing the dimensionality of the various arrays by 1. show through an example that we cannot implement the multiple-resource-type banker's scheme by applying the single-resource-type scheme to each resource type individually.
Answers
We use multiple schemes for the multiple resources
Here Resources are
A B C
P00 1 1
P1 3 0 2
P2 3 0 2
P32 1 1
P4 0 0 2
Now in the second case the resources are
A B C
P00 3 2
P1 3 0 2
P2 3 0 0
P32 1 1
P4 0 0 3
Now in the third case it would be like this
A B C
P00 0 3
P1 3 2 0
P2 3 2 0
P32 1 1
P4 0 2 1
The request for resources (0, 2, 0) from P0 is finally refused if we use the bankers algorithm for multiple resource types since it puts the system in an unsafe condition, but if we take the bankers algorithm for the three where we use a single resource type, we are given access to separate resources.
In that case, we must utilize bankers' algorithms for different resource kinds if we have several resource types.
Hence we can say that we use various banker's algorithms for different resource
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while discussing ei service, technician a says the crankshaft sensor may be rotated to adjust the basic ignition timing. technician b says the crankshaft sensor may be moved to adjust the clearance between the pickup coil and reluctor on some ei systems. who is correct?
Answers
It is true what technician b said about some ei systems allowing the clearance between the pickup coil and reluctor to be adjusted by moving the crankshaft sensor.
What mechanism is in charge of indicating when the coil is being switched on and off, or most often only on?A device that manages a bank of switches is a relay controller. Logic-controlled magnetic coils are turned on and off using relay controllers.
What occurs when the switching device interrupts the low voltage current flow in the coil primary winding?The magnetic field quickly collapses and a high voltage is induced in the primary winding when the primary current flow is stopped (CEMF Counter electromotive Force).
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he hybridization of the carbon atom labeled x in the molecule below is 10: HH 1 1 II H-N-C-0-0-H HC-H H A) sp B) sp2 C) sp3 D) sp3dE) sp3d2
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The hybridization of the carbon atom labeled x in the molecule below is 10: HH 1 1 II H-N-C-0-0-H HC-H H is sp2
What is meant by carbon atom?It is a non-metal and is denoted by the letter C. It has six protons, six neutrons, and six electrons, clearly. Because it can form virtually infinitely strong bonds with other carbon atoms, a carbon atom is regarded as remarkable and unique.
Carbon is a chemical element with the symbol C and atomic number 6 (from the Latin carbo, meaning "coal"). Its tetravalent atom allows for the formation of covalent chemical bonds using four of its electrons. It isn't made of metal. The periodic table's group 14 includes it.
In actuality, proteins, DNA, RNA, carbohydrates, lipids, and many other significant compounds in your body are supported by carbon atoms. These intricate biological entities are categorized as organic molecules and frequently referred to as macromolecules.
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when recovering cfc, hcfc, or hfc refrigerant into a non-pressurized container from a household refrigerator with an inoperative compressor it is; a. helpful to heat and strike the compressor with a rubber mallet. b. only necessary to recover as much refrigerant as will naturally flow out of the system. c. not necessary to recover since the refrigerant is probably contaminated. d. necessary to chase refrigerant from the oil with pressurized dry nitrogen.
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When recovering CFC, HCFC, or HFC refrigerant into a non-pressurized container from a household refrigerator with an inoperative compressor it is helpful to heat and strike the compressor with a rubber mallet.
What is refrigerant compressor?The refrigeration system's beating heart is the compressor. The compressor serves as the system's pump, distributing refrigerant.
The compressor operates as a result of temperature sensors. Recurrent refrigeration cycles are used in refrigeration systems to cool items.
As implied by its name, the compressor takes low pressure gas from the evaporator and compresses it into high pressure gas. The temperature increases when the gas is compressed. The condenser receives the hot refrigerant gas after that.
It is beneficial to heat the compressor and hit it with a rubber mallet when recovering CFC, HCFC, or HFC refrigerant into a non-pressurized container from a home refrigerator with an inoperative compressor.
Thus, the correct option is a.
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the density of totally crystalline polyethylene at room temperature is 1.213 g/cm3. also, at room temperature the unit cell for this material is triclinic with the following lattice parameters: a
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At room temperature the unit cell for this material is triclinic is 1 unit/cell.
What is the unit cell?In the problem statement we are given the following equation and information:
V = abc * sqrt(1 - cos^2 alpha - cos^2 beta - cos^2 gamma + 2cos alpha * cos beta * cos gamma)
= (0.497)(0.547)(1.729) √1 - cos2 48.4 - cos² 76.7 - cos² 62.5 + 2 cos 48.4 cos 76.7 cos 62.5
= 0.31n * m ^ 3
Next calculate the repeat unit weight for Nylon 6,6
m = 12A_{C} + 22A_{H} + 2A_{O} + 2A_{N}
= 12(12.01) + 22(1) + 2(16) + 2(14.01)
= 226.14g / m * ol
We can now calculate the number of repeat units per a unit cell. However we must convert V from n * m ^ 3 to c * m ^ 3 which results in V = 3.1 * 10 ^ - 22
n = (rho*VN)/m
= (1.213(3.1 * 10 ^ - 22)(6.02 * 10 ^ 23))/226.14
1 unit/cell.
The complete question is The density of totally crystalline nylon 6,6 at room temperature is 1.213g / c * m ^ 3 Also, at room temperature the unit cell for this material is triclinic with lattice parameters:
a = 0.497nm c = 48.4 deg
b = 0.547nm beta = 76.6 deg
c = 1.729nm y = 62.5 deg
If the volume of a triclinic unit cell, V tr i prime is a function of these lattice parameters as
V tri =abc sqrt 1-cos^ 2 a-cos^ 2 beta-cos^ 2 gamma+2 cos a cos beta cos gamma
determine the number of repeat units per unit cell.
Click on the link to access Table 4.3.
Atomic weights for several elements are included in the following table:
Carbon 12.01 g/mol
Chlorine 35.45 g/mol
Fluorine 19.00 g/mol
Hydrogen 1.008 g/mol
Oxygen 16.00 g/mol
Nitrogen 14.01 g/mol
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f the hubble plots in figures 2-4 represented three universes that are the same size, which hubble plot belongs to the youngest universe? explain your reasoning
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Figure 3. The fastest expansion rate means it would have taken the least amount of time to reach that size is hubble plot belongs to the youngest universe.
What can we infer about the cosmos from Hubble's law?One of the most significant quantities in cosmology is the Hubble constant because it informs us how quickly the universe is expanding, which may be used to calculate the age and history of the universe.Utilizing data from instruments that detect the cosmic microwave background, which is thought to represent light released shortly after the Big Bang, is one method. With an error rate of just 0.5 km/s/Mpc, these analyses have determined the Hubble Constant to be 67.4 km/s/Mpc.In essence, Hubble's Law implies that a galaxy recedes from ours quicker the farther away it is.The complete question is page 158 11. If the Hubble plots in figure 2-4 represented three universes that are the same size, which Hubble plot belongs to the youngest universe>
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