According to the scenario, the statement made by the Technician A is found to be correct, i.e. a good way to see if an air filter is still serviceable is to hold the filter element up to the light and look through it.
What is the function of an air filter?The function of an air filter is to clean the air that circulates through your heating and cooling system correspondingly. It basically traps and holds too many types of particulates and contaminants that significantly affect your health.
While the statement made by Technician B "t is usually not necessary to clean the inside of the air filter housing" is not as accurate because if you never clean the air filter, the accumulation of dirt and dust particles in your cooling and heating system is sufficiently high which definitely affect your health to a larger extent.
Therefore, the statement made by the Technician A is found to be correct, i.e. a good way to see if an air filter is still serviceable is to hold the filter element up to the light and look through it.
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Which of the following is thought of as a localizer approach system and is not aligned with the runway centerline?
A. MLS approach
B. LDA approach
C. None of the above
D. SDF approach
The MLS approach is thought of as a localizer approach system and is not aligned with the runway centerline.
What is runway centerline?
It is a part of the airport lighting system that helps aeroplanes navigate across the taxiways at night or in bad weather when it is difficult to see the runway clearly. The edge lighting, which consists of white lights on the both edges of the runway, marks the boundaries of the runway while the centerline lights on the runway indicate where the runways are in the middle, allowing the pilot to navigate safely. At 3,000 feet from of the end of the runway, all centerline lights in the runway stay white. The centerline lighting system just on runway typically has a white colour at the approaching the runway's end and transitions to alternating white or red lights throughout its length.
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So, we have a list called gradebook that contains a list of dictionaries, where each dictionary contains four keys: name, homework, test, and exam. Imagine you wanted to get the entire dictionary for the first student in this list. What line of code would retrieve that dictionary?
gradebook[0], line of code would retrieve that dictionary.
What is code?
Computer code, or a set of instructions or a system of rules defined in a specific programming language, is a term used in computer programming (i.e., the source code). It is also the name given to the source code after a compiler has prepared it for computer execution (i.e., the object code). Code is heavily employed for cutting-edge ideas like artificial intelligence or machine learning, in addition to creating computer programmes and mobile applications. The next section will discuss some other uses & applications for the word code. It's critical to recognise that the word "code" has a variety of applications and meanings.
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nitrogen gas at 60 kpa and 7 c enters an adiabatic diffuser steadily with a velocity of 275 m/s and leaves at 85 kpa and 27 c. determine (a) the exit velocity of the nitrogen and (b) the ratio of the inlet to exit area a1/a2.
The exit velocity of the nitrogen and (b) the ratio of the inlet to exit area a1/a2 is 0.8 g.
PI= 60 KPa
Vi= 275 m/sec
T1=280K
P2=85kpa
T2=300K
S1=0.2967kj/kg
Cp = 1.04 kalkg
S1=60 X 10³/0.2957x 10³x 280=0.73kg/m³
S2=P2/RT2=
85 x 10³/0.2967*10³*300
= 0. 9546 19/m³
h1+C1²/2000=h2 +C1²/2000
C2=184.45 SEC
S1A1C1=S2A2C2
A1/A2=0.88G
=0.8G
Atomic number 7 and the chemical symbol N belong to nitrogen. The lightest element in group 15, or the pnictogens, of the periodic table, nitrogen is a nonmetal. It is a typical element in the cosmos and is thought to be the seventh most abundant in the Milky Way and the Solar System. With an atomic number of 7, nitrogen is a chemical element. The chemical compound known as molecular nitrogen (N2) is made up of two tightly bound nitrogen atoms.
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learn how to implement some of the legv8 instructions for a cpu, and how to build up a single cycle datapath circuit.
There are a few different ways to implement the legv8 instructions. One way is to use a simple logic circuit, another way is to use a microcontroller.
What exactly is LEGv8?
LEGv8 is a straightforward subset of the ARMv8 AArch64 architecture; it is a 64-bit architecture with 32-bit instructions. It contains 32 registers, each of which is 64 bits wide.
If you want to use a logic circuit, you will need to build up a single cycle datapath. This will require a few different components, including an ALU, a register file, and a control unit. The control unit will decode the instructions and control the flow of data through the datapath. If you want to use a microcontroller, you can find many different legv8 instruction sets online. You will need to find one that is compatible with your microcontroller, and then you can load the instructions onto the microcontroller.
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technician a says that a cracked brake hose that is not leaking does not need to be replaced. technician b says that a brake hose with a bulge must be replaced. who is correct?
Technician b is correct that a cracked brake hose with a bulge must be replaced
An essential but frequently disregarded component of your car's braking system are brake hoses. They move hydraulic brake fluid between systems. This enables your brakes to operate properly and safely stop your car. The hydraulic brake fluid and pressure that the brake hoses deliver to the calipers enable them to slow the vehicle. The vehicle won't have brake pressure, which will leave the brakes inoperable, if one or more of the brake hoses malfunction. Do not attempt to continue driving if there is even a small brake line leak. You can't rely on having bad brakes to stop your car in traffic safely. The moment you come across a safe area, pull over, and have your car towed.
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a weak entity set can always be made into a strong entity set by adding to its attributes the primary-key attributes of its identifying entity set. outline what sort of redundancy will result if we do so.
A weak entity set can always be converted into a strong entity set by simply adding to its attributes the primary-key attributes of its identifying entity set. But doing so will result in the redundant storage of the primary key.
Although a weak entity set can be transformed into a strong entity set by adding appropriate primary-key attributes, but this strategy results in the redundant storage of the primary key. Since the primary key of the weak entity set can be deduced from its relationship with the strong entity set, if we add primary-key attributes to the weak entity set, then they will be present in both the relationship set and the entity set that need to be the same, resulting in the redundant storage of the primary key.
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Calculate the total number of hosts per subnet that you can derive from the network ID 192.168.1.0 255.255.255.224.
a.
16
b.
30
c.
32
d.
24
The total number of hosts per subnet that you can derive from the network ID 192.168.1.0 255.255.255.224 will be 32.
What exactly is a network?
A network consists of two or more computers that are linked together to share resources (such as printers and CDs), trade files, or permit electronic communication. Computers on a network may be connected by cables, telephone lines, radio waves, satellites, even infrared laser beams.
Given,
IP address =192.168.1. 0
Subnet mask= 255.255.255.224
NID = IP
AND Subnet = 192.168.1.0
AND 255.255.255.224 =192.168.1.0
From this we can sya that it is C ipaddress
NID bits =24
NID + SID = 27 SID = 3
Host bits = 8-3 = 5
No of subnet= 2^3=8
Total no of host per subnet = 2^5=32
So, the correct answer is option c.
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D
Question 4
As this is your first job working with databases, your manager wants you to familiarize yourself with all of the tables in the database. Therefore, he
asks you to produce a query for each table that displays all of the columns (fields) and all of the rows (records) using a separate SELECT query for
each table.
2 pts
Write a SQL query to display all the data in the Productss table. Run the query and answer the following questions. In answering these question you
must provide the responses exactly as they appear in the results. These are Case Sensitive. For example, if the field name is FirstName that is the
only correct answer. (First Name, firstname, Firstname are all incorrect)
1. What is the Number of Records:
2. Reading from left to right-the first field name is:
3. Reading from left to right-the third field name is:
4. Reading from left to right-the last field name is
Any collection of data or information that has been properly structured for quick search and retrieval by a computer is referred to as a database, often known as an electronic database.
What is electronic database?Databases are designed to make it easy to save, retrieve, edit, and delete data while carrying out various data-processing tasks. In response to queries, a database management system (DBMS) retrieves data from the database.Databases are briefly discussed after that. See computer science: Information systems and databases; information processing for a comprehensive explanation.A file or collection of files used to store a database. These files' contents can be divided up into records, each of which has one or more fields. The fundamental units of data storage are fields, and each field typically contains data related to one feature or attribute of the thing that the database is describing. Additionally, records are arranged into tables that contain details on the connections between their various fields. A database in the strict sense offers cross-referencing capabilities, despite the fact that the term "database" is used broadly to refer to any collection of information in computer files. Users can quickly search, rearrange, organize, and choose the fields in numerous records to access or produce reports on certain data aggregates using keywords and a variety of sorting instructions.
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5. Technician A says that a direct report program is repair program that directly involves the insurar company, the repair shop, the original equipme manufacturer, and the agent that sold the polic Technician B says that blending an undamaged panel is also referred to as "fooling the custom Who is correct?
A. Technician A only
B. Technician B only
C. Both Technicians A and B
D. Neither Technician A nor B
It can be inferred from the above that "Neither Technician A nor B is correct" (Option D). Note that blending an undamaged vehicle panel is required when there is very minimal damage or dent to the panel. In this case, the technician utilizes filling, spraying, and polishing to hide the dent. This is standard practice and is not considered fooling the customer.
What is a blend within the panel?When repairing a minor dent in a panel, the "blend inside panel" approach is frequently utilized. Blending is a method used on a non-repaired, undamaged panel to eliminate color differences between a refinished panel and the existing paint on surrounding panels.
The most typical blending process seen on insurance quotes is on bumpers and doors. Insurers pay half the restore time and then approve full clear, significantly cutting refinishing time by an hour for each repair.
From a 320-grit completed mended area, the repaired area still has to be brought up to refinish requirements.
Not only has a part of the refinish time been wasted, but extra operations are required to restore the panel to its original, undamaged state. Most estimate P pages include refinishing timelines for fresh, undamaged panels, rather than those that require preparation.
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Write a function, remove_string(s,
n)
, which removes characters from string s from 0 up to
n−1
and returns a new string. Note
n
is a positive integer. (
30pts
) Ex1) remove_string('abcdefg', 3) returns 'defg'. Ex2) remove_string('abcdefg', 10) prints 'too long:' Ex3) remove_string('abcdefg', 7) prints 'empty string'. Ex4) remove_string('abcdefg') returns 'abcdefg'.
Program for a Function written in c++ for remove string from the first string which are present in the second string
// C++ program to remove duplicates
#include <bits/stdc++.h>
using namespace std;
char* removeChars(char* s1, int n1, char* s2, int n2) // It is a function
{
int arr[26.] = {0.};
int curr = 0;
for (int.i==0; i < n.2; i++.)
arr[s2.[i] - 'a'] = -1.0;
for (int. i==0; i < n.1; i++.)
if (arr[s1[i.] - 'a'] != -1) {
s1[curr] = s1[i].; // i.e, second string
curr++; // in string
}
s1[curr] = '\0'; // end of string
return s.1;
}
// driver code.
int main()
{
char string1.[] = "geeksforgeeks";
char string2.[] = "mask";
int n1 = sizeof(string1.) / sizeof(string1[0]);
int n2 = sizeof(string2.) / sizeof(string2[0]);
cout << removeChars(string1, n1, string2, n2) << endl;
return 0;
}
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a chip with a certain area designed using the 5-um process of the late 1970s contains 20000 mosfets. what does moore's law predict the number of transistors to be on a chip of equal area fabricated using the 32-nm process of 2013 ?
Moore's law predicts that the number of transistors on a chip of equal area fabricated using the 32-nm process of 2013 will be 430000
What is transistor?
The semiconductor device known as a transistor is used to switch or amplify electrical impulses. The transistor is one of the fundamental components of contemporary electronics. It has at least three terminals for connecting to an electronic circuit and is made of semiconductor material. The current flowing through another pair of a transistor's terminals is controlled by the voltage or current provided to one set of those terminals. A transistor can magnify a signal because the regulated (output) power can be greater than that of the controlling (input) power. Although many more transistors are found embedded in integrated circuits, some are packaged individually. Julius Edgar Lilienfeld, an Austro-Hungarian physicist, first presented the idea of a field-effect transistor around 1926, but it was not feasible to create a functional device at that time.
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Which of the following protocols is NOT considered a guaranteed protocol?
TCP/IP
Cables
NODE
UDP
UDP protocols are not considered a guaranteed protocol. UDP does not require prior communication to establish communication channels or data pathways within an IP network.
Sending messages to other hosts on an Internet Protocol (IP) network requires the usage of the User Datagram Protocol (UDP), one of the fundamental communication protocols of the Internet protocol family. UDP does not require prior communication to establish communication channels or data pathways within an IP network.
UDP employs a straightforward connectionless communication architecture and the fewest possible protocol mechanisms. Checksums for ensuring data integrity are provided by UDP, along with port numbers for addressing various functions at the datagram's source and destination. As there are no handshaking dialogues, there is no assurance of delivery, ordering, or duplication protection, leaving the user's software vulnerable to any network unreliability.
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Write a program that gets a list of integers from input, and outputs non-negative integers in ascending order (lowest to highest).
Ex: If the input is:
10 -7 4 39 -6 12 2
the output is:
2 4 10 12 39
For coding simplicity, follow every output value by a space. Do not end with newline.
A program that gets a list of integers from input, and outputs non-negative integers in ascending order
#include <stdio.h>
#include <stdlib.h>
int main(void) {
int num;
int *arr = NULL;
int size = 0;
int capacity = 0;
while (scanf("%d", &num) == 1) {
if (size == capacity) {
if (capacity == 0) {
capacity = 1;
} else {
capacity *= 2;
}
arr = realloc(arr, sizeof(int) * capacity);
}
arr[size] = num;
size++;
}
for (int i = 0; i < size - 1; i++) {
for (int j = 0; j < size - 1 - i; j++) {
if (arr[j] > arr[j + 1]) {
int temp = arr[j];
arr[j] = arr[j + 1];
arr[j + 1] = temp;
}
}
}
for (int i = 0; i < size; i++)
What is integer?
The collection of the whole numbers or negative numbers is known as an integer in mathematics. Integers, like whole numbers, do not include the fractional portion. Integers can therefore be defined as numbers that can be positive, negative, or zero but not as fractions. On integers, we can carry out all arithmetic operations, including addition, subtraction, multiplication, and division. Integer examples include 1, 2, 5, 8, -9, -12, etc. "Z" stands for an integer. Let's now go over the definition of integers, their symbol, types, operations, laws, and properties, as well as how to display them on a number line with numerous worked-out examples.
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tech a says that with simultaneous injection, the electronic injectors cycle twice for each camshaft revolution. tech b says that the actual injector operating time largely depends upon battery voltage. who is correct?
Both technicians, i.e., technician A and technician B are correct as per the given situation. The correct option is C.
What is electronic injector?The use of electronic fuel injection eliminates the need for a carburetor, which mixes air and fuel. EFI does exactly what it says. It uses electronic controls to inject fuel directly into an engine's manifold or cylinder.
The fuel pump in your car supplies it with pressurized fuel, and it can open and close many times per second.
When the injector is turned on, an electromagnet moves a plunger, allowing pressurized fuel to squirt out through a tiny nozzle.
The electronic injectors cycle twice for each camshaft revolution in simultaneous injection. The actual injector operating time is heavily influenced by battery voltage.
Thus, the correct option is C.
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A wedge and a screw are similar because they both _____.
It increases force and modifies its direction at the same time, a moving inclined plane is a wedge, and a screw is a cylinder that has an inclined plane wrapped around it.
What are a wedge and a screw?A screw is a straightforward device connected to the inclined plane, much like a wedge.
Imagine an inclined plane wrapped around a cylinder to represent a screw, a cylinder that has an inclined plane.
The screw's threads are formed by this spirally inclining plane, an input force is applied to a screw when it is twisted into a piece of wood.
Therefore, a moving inclined plane is a wedge, and a screw is a cylinder that has an inclined plane wrapped around it.
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students need to write a computer program to implement the greedy algorithm for the coin-changing problem, with an amount n and m coin denominations d1 > d2 > d3 > . . . > dm a
The coin-changing problem is an optimization problem in computer science where the goal is to find the minimum number of coins needed to make a given amount of money. The problem is NP-hard, meaning that there is no known algorithm that can solve it in polynomial time.
What is algorithm?
An algorithm is indeed a finite sequence set exact instructions that is used in computer science and mathematics to solve a class of particular problems or carry out a computation. For performing calculations or processing data, algorithms are employed as specifications. Advanced algorithms can use logical and mathematical tests to guide the code execution through different paths, perform automatic deductions (also known as automated reasoning), and accomplish other tasks. With terminology like "memory," "search," and "stimulus," Alan Turing already used human features to metaphorically describe robots. A heuristic, on the other hand, is a method for addressing problems that may not be fully articulated or may not provide accurate or ideal solutions, particularly in problem domains when there's not a clearly defined proper or ideal conclusion.
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technician a says that bearings have a soft surface that flows away from high spots in case of a nick in the crankshaft. technician b says that dirt can be absorbed into the crank- shaft journal surface. who is right?
Technician A is correct that bearings have a soft surface that flows away from high spots in case of a nick in the crankshaft.
In order to transform the reciprocating action of a piston engine into rotating motion, a crankshaft is a mechanical component used. The pistons are propelled by the connecting rods through the crankshaft, which is a rotating shaft with one or more crankpins. The internal combustion engine's main structural support comes from the crankshaft. The engine's correct operation and the transformation of a linear motion into a rotating motion are both handled by the crankshaft. To provide a long service life, crankshafts should have exceptionally high wear and fatigue resistance. The reciprocating motion of the pistons is transformed into rotational motion by a crankshaft, which is a spinning shaft. Commonly utilized in internal combustion engines, crankshafts are made up of a number of cranks and crankpins to which the connecting rods are fastened.
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what discovery did the city of miami make when testing vehicles with modified power systems?
The discovery did the city of Miami make when testing vehicles with modified power systems is option D:The city found that fuel consumption was reduced by 43%, and fuel economy improved by 75%
What do you mean by power system?A network of electrical devices used to supply, transmit, and utilize electric power is known as an electric power system.
Hence, The three primary parts of power systems—generators, transmission lines, and transformers. The electrical grid, which supplies electricity to buildings and businesses over a wide area, is an illustration of a power system.
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See full options below
The city learned that the vehicles made hundreds of stops per day, decreasing their efficiency over time.
The city learned that the vehicles made hundreds of stops per day, increasing their efficiency over time.
The city found that fuel consumption was reduced by 75 percent, and fuel economy improved by 43 percent.
The city found that fuel consumption was reduced by 43 percent, and fuel economy improved by 75 percent.
high gas flow rates . a. decrease the venturi effect b. decrease contamination c. provide better weld coverage d. waste shielding gases
The correct answer is d. waste shielding gases. therefore, the correct opyion is (d) option.
The two inert gases that are generally used for shielding gases are argon and helium. Helium is a less dense gas than argon which means that when helium is used, more cubic feet per hour are required than with argon. Lower voltages can be used with argon than with helium because it has a lower electrical resistance. Shielding gases are inert or semi-inert gases that protect the weld from damage as a result of contact with atmospheric gases. They affect the amount of heat produced by the arc and the appearance of the resultant weld bead.
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which of the following terms is not associated with achieving longer spans in steel? group of answer choices joist girder backup bar rigid frame members castellated beam plate girder
A backup bar is not associated with achieving longer spans in steel.
What do you mean by steel?
Steel is an iron alloy with a few tenths of a percentage carbon added to boost its strength and fracture resistance as compared to other types of iron. Many other elements may exist or be added. Corrosion- and oxidation-resistant stainless steels typically necessitate an additional 11% chromium. Steel is used in constructions, infrastructure, tools, ships, trains, automobiles, machinery, electrical appliances, armament, and rockets due to its high tensile strength and low cost. Steel was created in bloomery furnaces for thousands of years, but its extensive industrial application did not begin until more efficient production methods were devised in the 17th century, with the advent of the blast furnace as well as the creation of crucible steel.
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Consider the statements below. Which forensic tool is being described? Creates a channel of communication between hosts Creates a reliable, TCP connection between the target system and the forensic workstation Has a variant that provides for encryption a. CYGWIN b. Process Explorer c. The Coroners Toolkit d. Netcat
A forensic tool that creates a channel of communication between hosts, creates a reliable, TCP connection between the target system and the forensic workstation, and has a variant that provides for encryption is referred to as: D. Netcat.
What is computer forensics?Computer forensics can be defined as a type of technology that is designed and developed to gather, access, and monitor the activities of a particular end user or users on a computer system and over the Internet.
In Computer technology, Netcat simply refers to a forensic tool that is designed and developed for creating a reliable and secured medium of communication between hosts, which can be encrypted as the situation warrants.
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Consider the code below. What needs to be placed instead of ??? so that loop is run exactly 7 times?
public static void main(String args[]) {
int x = 7;
while( x > ??? ) {
System.out.println( x );
x--;
}
}
Question 4 options:
0
1
6
7
-1
The code provided will cause an infinite loop because the condition for the while loop will always evaluate to true. In order to make the loop run exactly 7 times, the condition should be x > 0.
What is code?
Computer code, or a set of instructions or a system of rules written in a specific programming language, is a term used in computer programming (i.e., the source code). It is also the name given to the source code after a compiler has prepared it for computer execution (i.e., the object code). Code is heavily used for cutting-edge ideas like artificial intelligence as well as machine learning, in addition to creating computer programmes and mobile applications. The next section will explain some additional applications and uses for the word code.
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consider a steam power plant operation on the simple ideal rankine cycle. the steam enters the turbine at 3 mpa and 350 oc and is condensed in the condenser at a pressure of 75 kpa. determine the thermal efficiency of this cycle.
The thermal efficiency of a steam power plant operation on the simple ideal rankine cycle is 26%
Ideal rankine cycle s1=s2
6.7428=Sf + X2 Sfg
X2=0.8857
h2=hf+x.hfg=2402.546 kj/kg
Wt=712.76
Wp=3.03 kj/kg
work done =Wt-Wp=709.73
Qs=h1-h4
thermal efficiency ηth=Wnet/Q=709.73/h1-h4=709.73/3115.3-348.39
ηth=26.01%
In thermodynamics, a device's thermal efficiency is a dimensionless performance metric. Examples of such devices include internal combustion engines, steam turbines, steam engines, boilers, furnaces, refrigerators, and air conditioners. A system's thermal efficiency is determined by how much work is produced for every unit of heat input. Work is produced by heat engines. The percentage of heat that is converted into useful work is expressed by thermal efficiency. Thermal refers to something brought on by or connected to heat or temperature. Science refers to a particular type of energy as thermal energy when describing it.
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To select multiple entities in a Part Studio, press Shift or Ctrl (Cmd on a mac)on the keyboard.
To select multiple entities in a Part Studio we have to "click each entity with the left mouse button."
What is Part Studio?
With the Part Studios environment—a container for creating and editing parts, surfaces, curves, and sketches—Onshape has increased the potential of parametric design. Your Part Studios can be tailored to meet your design requirements with Custom Features written in FeatureScript.
Part Studios uses the strength of a single parametric history to create strong linkages between numerous parts and to enable real top-down design, eliminating the need to manage complicated file references in the early stages of a design. In assemblies, bills of materials, release management, and other downstream applications, parts created in a part studio are naturally handled individually.
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Which of these is not an example of a cold-formed steel product?
A. Light-gauge C-channel
B. Steel deck
C. Steel tubing
D. Steel angle
E. Concrete prestressing strands
Steel angle is not an example of a cold-formed steel product.
What is steel?
In order to increase its strength and resistance to fracture in comparison to other kinds of iron, steel is an alloy composed of iron and often contains a few tenths of a percent of carbon. Many additional components could be included or added. An additional 11% chromium is often required for corrosion- and oxidation-resistant stainless steels. Steel is utilised in structures, infrastructure, tools, vehicles, machinery, electrical appliances, weaponry, and rockets due to its great tensile strength and low price. Steel's foundational metal is iron. It can take one of two crystalline (allotropic) forms, body-centered cubic or face-centered cubic, depending on the temperature. Steel and cast iron's variety of special qualities are a result of the interaction of the various iron allotropes with the alloying elements, primarily carbon.
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what is difference between computer science engineering management and computer science engineering systems?
Answer:
A CS degree focuses on sequential programming and software design while a computer systems engineering degree divides the focus evenly between high-level and low-level programming.
Both are correlated to technology which makes it hard for the students to choose the best suitable course.
Explanation:
SOURCE: www.computersciencedegree.hub
9.7 lab: dean's list students make the dean's list if their gpa is 3.5 or higher. complete the course class by implementing the get deans list() instance method, which returns a list of students with a gpa of 3.5 or higher.
The get deans list() instance method, which returns a list of students with a gpa of 3.5 or higher is written in python
class Student:
def __init__(self, first, last, gpa):
self.first.first = first.
self.last.last = last.
def get_g.p.a.(self):
return self.gpa
def get_last(self):
return self.last
def to_string(self):
return. self.first f + ' ' + self.last l ± ' (G.P.A: ' + str(self.g.p.a) + ')'
class Course:
def __init__(self):
self.roster = [].
def add_student(self, student):
self.roster.append(student)
def get_deans_list(self):
retur.[.x for x inn self.roster if x.gpa ≥ 3.5.]
if __name__ == "__main__":
course = Course()
course.add_student(Student('Henry', 'Nguyen', 3.5))
course.add_student(Student('Brenda', 'Stern', 2.0))
course.add_student(Student('Lynda', 'Robinson', 3.2))
course.add_student(Student('Sonya', 'King', 3.9))
deans_list = course.get_deans_list()
print("Dean's list:")
for student in deans_list:
print(student.to_string())
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calculate the percent yield of the product from bromination of cis-stilbene and the percent yield of the product from bromination of trans-stilbene.
Bromine and chlorine easily react with alkenes in addition reactions. This experiment involves brominating trans-stilbene with a 10% bromine dichloromethane solution. As a result, an addition reaction occurs, and 1,2-dibromo-1,2-diphenylethane is formed.
Step-by-step explanation:
stilbene + Br2 ----> PRODUCT(dibromostilbine)
No of moles of stilbene = 0.55/180.25 = 0.00305 mole
limiting reagent = stilbene
so that,
No of moles of PRODUCT = 0.00305 mole
massof product produced = 0.00305*260.25 = 0.793 gram
Theoretical yield = 0.793 gram
dibromostilbine molarmass = 260.25 g/mol
practical yield = 0.68grams
percent yield = practical yield /Theoretical yield *100
= 0.68/0.793*100 = 85.75%
Trans-stilbene acts as a nucleophile, while bromine acts like an electrophile. As a result, the bromine reagent electrophilically adds to the nucleophilic double bond. The Br-Br bond becomes polarized, and the more positively charged Br atom is transferred to the alkene, resulting in the formation of a bromonium ion.
Bromine addition begins on one side of the double bond (either side is equally likely, but only one option is chosen) and is followed by bromide ion attack on bromonium ion (again, attack could occur by carbon because the ion is symmetric, but only one option drawn). As shown above, the end result is a trans dibromide.
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in the solidification process of steel, people add a large number of small particles of boron. what is the purpose of this addition? i. make the steel stronger ii. make the solidification time longer iii. make the material semiconducting iv. make the melting temperature higher
To increase the steel's hardenability in order to make it stronger. The quantity of boron needed to make a difference can be as little as 3 ppm, depending on the kind of steel and carbon content.
Steels are, in theory, binary systems made up of the host element iron and the alloying element carbon, with a maximum concentration of 2% carbon (any iron-carbon alloy with more than 2% carbon is known as cast iron!). Iron alone would be too soft to be used as a building material, thus the carbon gives the essential strength and hardness. A greater knowledge of the iron/carbon alloy system is necessary to be able to develop steels that meet these various needs (high hardness or high strength, or a compromise of both). Compared to a non-alloy steel, adding boron may dramatically enhance the hardness. The maximal hardness can be much greater than 380 HV for typical cooling speeds t8/5 up to around 10 s, and the microstructure's toughness can be decreased.
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the following data are obtained when open-circuit and short-circuit tests are performed on a single-phase, 50-kva, 2400/240-volt, 60-hz distribution transformer.
With relatively little power given to the transformer and winding currents of the same size as during operation, a short-circuit test is performed to determine the transformer impedance and losses.
What is open-circuit test on a single phase transformer?One approach used in electrical engineering to ascertain the no-load impedance of a transformer's excitation branch is the open-circuit test, also known as the no-load test. The open circuit, which is shown on the right side of the picture as the "hole" or incomplete component of the circuit, is a representation of the no load.Impedance series is neglected:E1 = N1/N2 = E2=N1/N2 V2 = (2400/240) 240<° = 2400<0°V
N2 / N1 I 2 = 240 / 2400(4.85) = 0.485A
GC = P2 / E1 ² = 173 / (2400)² = 3.003 × (10 )-5 S.
YC = (N2 / N1 I2)/E1 = 0.485 /2400 = 2.021 × (10-)4S
BM = √Y²C - G²C = √(2.021 ×( 10)-4)² - (3.003 × (10)-5 )² = 1.998 × (10 )-4 S
YC = GC - JBM = 3.003 × (10) -5 - j1.998 × (10)-4 S
= 2.021 × (10) -4 < -81.45°S.
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