Calculate the internal energy and enthalpy changes that occur when air is changed from an initial state of 277 K and 10 bars, where its molar volume is 2.28 m²/kmol to a final state of 333 K and 1 atm. Assume for air PV/T is constant (i.e it is an ideal gas) and Cv = 21 and Cp = 29.3 kg/kmol-¹
Answers
Answer:
PV/T is constant and that CV=21 kJ/kmolK and CP=29.3 kJ/kmol.K
Explanation:
To calculate the internal energy and enthalpy change for the given air system, we can use the first law of thermodynamics, which states that the change in internal energy of a system is equal to the heat added to the system minus the work done
Related Questions
Features common to mobile apps include_____. Select all that apply
A. optimization for a small screen
B. low or froe price point
C. connectivity
D. compatibility with the desktop version
Answers
Features common to mobile apps include optimization for a small screen, low or free price point, connectivity, and compatibility with the desktop version.
A. Optimization for a small screen: This is a common feature of mobile apps as mobile is designed to be used on a smaller screen than desktops or laptops. The UI of the app must be optimized for the smaller screen size.
C. Connectivity: Mobile devices are often used on the go, so mobile apps must be designed to work seamlessly with a variety of connectivity options, including Wi-Fi, cellular data, and Bluetooth.
B. Low or free price point: Many mobile apps are designed to be either low-cost or free to download and use. This is due to the highly competitive nature of the mobile app market, as well as the desire to reach a large user base quickly.
D. Compatibility with the desktop version: Many mobile apps are designed to be compatible with multiple devices and even the desktop version is allowing users to switch between the two without losing any data or functionality.
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WILL MAKE AS BRAINLEST
I answered some of them can anyone help with the rest?
1. What document granted permission to found and established the boundaries of the Georgia Colony?
The charter
2. Why was Georgia founded as a “buffer colony”?
defend the southern British colonies from Spanish Florida.
3. Why did Oglethorpe originally want to start a new colony in the New World?
He wanted to give debtors another chance at life instead of prison
4. According to the Charter of 1732, what are the three reasons for starting the colony of Georgia?
Charity Economics Defense
5. How did the relationship between Oglethorpe and Tomochichi impact the founding and establishment of the colony of Georgia?
6. Who founded the city of Savannah?
James Oglethorpe
7. Describe, in detail, how the following individuals contributed to the founding of Georgia:
Tomochichi:
Mary Musgrove:
8. What were the Salzburgers able to produce that the colonists of Savannah had trouble producing?
9. Who was the interpreter /ambassador between Oglethorpe and Tomochichi?
10. Who was the leader of the Yamacraw Indians?
11. What did the Malcontents want to happen in Georgia? (Think rules)
12. Who is credited with saving the lives of many colonists from disease (cholera) after he and his people were allowed into the colony of Georgia?
13. What type of colony was Georgia at first? Who would oversee the colony of Georgia?
14. After the Trustee Colony fell, what type of colony would Georgia become?
15. Who “ran” the colony of Georgia once it became a Royal Colony?
16. What rule did the Malcontents want to change the most?
Land
17. When the slavery ban was lifted, Georgia saw a rapid increase in what between 1750-1775?
Agraculture
18. What did the Royal Governors do that help prove they were trying to keep the settlers satisfied? (Think change in rules/laws)
19. What were the five main goods that were sold in the Georgia Colony? Remember WRIST
20. What increased dramatically after the Royal period began?
What type of shading techniques requires using the side of the pencil to add value.
Answers
Answer:
YES
Explanation:
NO
;-;
Which one of the following answer options are your employers responsibility
Answers
Where are your answer options?
Answer:
Implement a hazard communication program
Explanation: i took the quiz
Theo Anh / Chị, để đáp ứng yêu cầu phát triển nền kinh tế thị trường định hướng Xã hội Chủ nghĩa ở Việt Nam trong bối cảnh thời đại hiện nay, cần chú trọng giải quyết những vấn đề gì ?
Answers
tôi nghĩ
Problem 1
An engine piston-cylinder assembly contains gas at a pressure of 96 kPa. The gas is compressed according to p = aV + b where a = -1200 kPa/m3 and b = 600 kPa. Determine the work done on the gas during this process if the final pressure is 456 kPa.
Answers
The work done on the gas during this process if the final pressure is 456 kPa is; -82.8 kJ
Workdone in Thermodynamics
We are given;
The initial pressure; P₁ = 96 kPa
Final Pressure; P₂ = 456 kPa
The gas is compressed according to;
p = aV + b
where;
a = -1200 kPa/m³
b = 600 kPa
Thus, at initial pressure P₁ = 96 kPa;
96 = -1200V₁ + 600
1200V₁ = 600 - 95
1200V₁ = 505
V₁ = 505/1200
V₁ = 0.42 m³
At Final Pressure P₂ = 456 kPa;
456 = -1200V₂ + 600
1200V₂ = 600 - 456
1200V₂ = 144
V₂ = 144/1200
V₂ = 0.12 m³
Formula for the workdone during the process is;
W_out = ¹/₂(P₁ + P₂)(V₂ - V₁)
W_out = ¹/₂(96 + 456)(0.12 - 0.42)
W_out = -82.8 kJ
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The use of seat belts in cars has significantly reduced the number of crash fatalities. Which statement best explains how the market forces of supply and demand guided the development of seat-belt technology?
A.When a large enough supply of seat-belt parts became available, the public demand for their use in cars increased.B.Consumers' desire for more comfortable seat belts led engineers to improve seat belts.C.Engineers recognized the dangers of not wearing a seat belt and decided to develop systems that would be affordable to manufacture.D.As car manufacturers developed seat-belt technology, they began to advertise seat belts' ability to prevent injuries and death to consumers.
Answers
Consumers desire for more comfortable seat belts led engineers to improve seat belts.
Explanation:
Answer:
B. Consumers' desire for more comfortable seat belts led engineers to improve seat belts.
Explanation:
just got the question right on APEX
Please do not use break and continue statments, do not use ".find" or ".compare".
I need help write the function extract_words, I know I need to pushback on the vector using a loop but I do not know what to write. and on the function output_articles. How can I count the capital words with the the regular ones?
Sample code:
/*
File: sentence.cpp
Created by:
Creation Date:
Synopsis:
*/
#include
#include
#include
#include
using namespace std;
/* INSERT FUNCTION PROTOTYPES HERE */
string get_text(const string input );
vector extract_words(string input);
void output_articles( vector secVector);
void output_words(string message, vectorwords);
void sort_words( vector finalVector);
int main() {
string sentence;
vector words;
sentence = get_text("Enter your sentence: ");
if (sentence.length() > 0) {
words = extract_words(sentence);
cout << endl;
output_words("You entered the word(s)", words);
cout << endl;
output_articles(words);
cout << endl;
sort_words(words);
output_words("The sorted list is", words);
}
else {
cout << "You entered no words" << endl;
}
return 0;
}
/* INSERT FUNCTION DEFINITIONS HERE */
string get_text(const string input ){
string output;
cout << input << endl;
getline(cin, output);
return output;
}
vector extract_words(string input){
}
output_words(string message, vectorwords){
cout << message << "<";
for (int=0; i < words.size();i++){
if (i==words.size()-1){
cout << "'" << words.at(i) << "'" << " ";
}
else{
cout << "'" << words.at(i) << "'"
}
}
cout << ">" << endl;
}
void output_articles( vector secVector){
int n=secVector.size();
int count1=0,count2=0,count3=0;
for(int i=0;i
{
if(secVector[i]=="the")
count1++;
else if{
(secVector[i]=="a")
count2++;
}
else if{
(secVector[i]=="an")
count3++;
}
}
cout<<"Number of each article:"<
cout<
cout<
cout<
}
void sort_words(vector finalVector){
sort(finalVector.begin(), finalVector.end());
return finalVector;
}
Answers
The function that is asked in the question is given below in the explanation part.
Here is a modified version of the CPP code with the output_articles and extract_words methods added in accordance with your specifications:
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;
/* INSERT FUNCTION PROTOTYPES HERE */
string get_text(const string input);
vector<string> extract_words(string input);
void output_articles(const vector<string>& words);
void output_words(string message, const vector<string>& words);
void sort_words(vector<string>& words);
int main() {
string sentence;
vector<string> words;
sentence = get_text("Enter your sentence: ");
if (!sentence.empty()) {
words = extract_words(sentence);
cout << endl;
output_words("You entered the word(s):", words);
cout << endl;
output_articles(words);
cout << endl;
sort_words(words);
output_words("The sorted list is:", words);
} else {
cout << "You entered no words" << endl;
}
return 0;
}
/* INSERT FUNCTION DEFINITIONS HERE */
string get_text(const string input) {
string output;
cout << input << endl;
getline(cin, output);
return output;
}
vector<string> extract_words(string input) {
vector<string> words;
string word = "";
for (char c : input) {
if (c == ' ') {
if (!word.empty()) {
words.push_back(word);
word = "";
}
} else {
word += c;
}
}
if (!word.empty()) {
words.push_back(word);
}
return words;
}
void output_words(string message, const vector<string>& words) {
cout << message << " ";
for (int i = 0; i < words.size(); i++) {
cout << "'" << words[i] << "'";
if (i != words.size() - 1) {
cout << " ";
}
}
cout << endl;
}
void output_articles(const vector<string>& words) {
int count1 = 0, count2 = 0, count3 = 0;
for (const string& word : words) {
if (word == "the") {
count1++;
} else if (word == "a") {
count2++;
} else if (word == "an") {
count3++;
}
}
cout << "Number of each article:" << endl;
cout << "the: " << count1 << endl;
cout << "a: " << count2 << endl;
cout << "an: " << count3 << endl;
}
void sort_words(vector<string>& words) {
sort(words.begin(), words.end());
}
Thus, the output_articles function computes the number of times each of the articles "the," "a," and "an" appear in the word vector and prints the results.
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what is the current that will flow through a 10k potentiometer being used as a voltage divider with a 5v input?
Answers
Explanation:
The current flowing through a potentiometer used as a voltage divider is given by:
I = V / R
where:
I = current (A)
V = voltage across the potentiometer (V)
R = resistance of the potentiometer (Ω)
Since a potentiometer is a variable resistor, the voltage across it, V, can be determined by the position of the wiper on the resistive element and the input voltage.
Let's assume the wiper is positioned to divide the voltage in half, so the voltage across the potentiometer is V = 5V / 2 = 2.5V.
The resistance of the 10k potentiometer can be taken as its maximum resistance, R = 10 kΩ = 10,000 Ω.
Plugging in the values:
I = 2.5V / 10,000Ω = 0.25 mA
So the current flowing through the 10k potentiometer when used as a voltage divider with a 5V input is 0.25 mA.
please help me solve this
Answers
Answer:
Following are the solution to this question:
Explanation:
\(\to \Sigma F_x = ma_x \\\\\to 3200 t^2 -440 (9.81) (\frac{8}{17}) = 440 (a) \\\\\to 3200 t^2 -2031.24 = 440 (a)\\\\\to a= 7.27t^2 -4.616\\\\\to dv=a.dt \\\\\to \int^{v}_{2} dv = \int^{2}_{0} (7.27t^2 -4.616) dt\\\\\to v-2 = 7.27 \frac{t^3}{3} - 4.616 t^{2}_{0}\\\\\to v-2 = 7.27 \frac{2^3}{3} - 4.616 {2} \\\\\to v-2 = 10.154\\\\\to v= 12.154 \ \frac{m}{s}\\\)
9. The highest voltage typically encountered on the job by a residential electrician is
volts.
A. 120
B. 600
C. 240
D. 480
Answers
Answer:
240
Explanation:
The highest voltage typically encountered on the job by a residential electrician is C. 240 volts.
What is voltage?Voltage is the measure of the difference in electrical power between two points in a circuit.
It is like the force that pushes electric charges in a circuit and is measured in volts (V) and affects how strong the electric current flows in a wire.
In many countries, the United States included, residential electrical systems often use a split-phase setup with a voltage of 120/240 volts.
This voltage is widely used for things like household appliances, lights, and other electrical needs in homes.
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This wired networking standard specifies the order in which data is sent through the network.
Select one:
a. Ethernet
b. WiMAX
c. LTE
d. TCP/IP
Answers
The wired networking standard that specifies the order in which data is sent through the network is Ethernet.
Ethernet is a widely used wired networking standard that defines the protocols and specifications for data transmission over a local area network (LAN). It specifies the order in which data is sent through the network by utilizing the Carrier Sense Multiple Access with Collision Detection (CSMA/CD) algorithm.
The CSMA/CD algorithm ensures that multiple devices connected to an Ethernet network can share the same communication medium without interfering with each other. Before transmitting data, a device using Ethernet listens to the network to detect if it is clear to send data. If the network is busy, it waits for an opportune moment. Once the network is clear, the device sends the data, constantly monitoring for collisions. If a collision occurs (when two or more devices transmit data simultaneously), they stop transmitting, wait for a random period of time, and then retry.
By following this protocol, Ethernet ensures orderly and efficient data transmission within the network, minimizing collisions and maximizing data throughput. It has become the de facto standard for wired local area networks due to its reliability, scalability, and widespread adoption.
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The koyna hydroelectric project is equipped with four units of vertical shaft pelton turbines to be coupled with 7000kvA, 3 phase, 50 hertz generators. the generator are provided with 10 pairs of poles. the gross design head is 505m and the transmission efficiency of head race tunnel and penstock together is 94%. the four units together provide for a power of 260MW at efficiency of 91%. the nozzle efficiency is 98% and each turbine has four jets. take speed ratio to be 0.48 and flow coefficient to be 0.98 and nozzle diameter 25% bigger than jet diameter, estimate the; a)discharge for the turbine b)jet diameter c)nozzle tip diameter d)pitch circle diameter of the wheel e)specific speed f)number of buckets on the wheel
Answers
Answer:
a) Discharge for the turbine: 0.053 m³/s
b) Jet diameter: 5.53 meters
c) Nozzle tip diameter: 6.91 meters
d) Pitch circle diameter of the wheel: 11.48 meters
e) Specific speed: 26.76
f) Number of buckets on the wheel: 43
Explanation:
To estimate the required values for the Koyna hydroelectric project, we'll use the given information and apply relevant formulas. Let's calculate each value step by step:
a) Discharge for the turbine:
The power output of the four units combined is given as 260 MW. Since the efficiency is 91%, we can calculate the actual power output:
Power output = Efficiency * Total power output
Power output = 0.91 * 260 MW
The power output is related to the discharge (Q) and gross head (H) by the following formula:
Power output = Q * H * ρ * g / 1000
Where:
ρ = Density of water = 1000 kg/m³
g = Acceleration due to gravity = 9.81 m/s²
From this equation, we can solve for Q:
Q = (Power output * 1000) / (H * ρ * g)
Substituting the given values:
Q = (260 MW * 1000) / (505 m * 1000 kg/m³ * 9.81 m/s²)
Q = 0.053 m³/s
Therefore, the discharge for the turbine is 0.053 m³/s.
b) Jet diameter:
The flow coefficient (φ) is given as 0.98. The jet diameter (D) can be calculated using the following formula:
φ = (π * D² * Q * √(2 * g * H)) / (4 * A * √(2 * g * H))
Where:
A = Number of jets
Rearranging the formula, we get:
D² = (4 * A * φ * A * √(2 * g * H)) / (π * Q)
Substituting the given values:
D² = (4 * 4 * 0.98 * 4 * √(2 * 9.81 m/s² * 505 m)) / (π * 0.053 m³/s)
D² ≈ 30.66
Taking the square root:
D ≈ √30.66
D ≈ 5.53 m
Therefore, the jet diameter is approximately 5.53 meters.
c) Nozzle tip diameter:
The nozzle tip diameter (d) is given to be 25% larger than the jet diameter (D):
d = D + 0.25 * D
d = 5.53 m + 0.25 * 5.53 m
d ≈ 6.91 m
Therefore, the nozzle tip diameter is approximately 6.91 meters.
d) Pitch circle diameter of the wheel:
The speed ratio (λ) is given as 0.48. The pitch circle diameter (D_p) is related to the jet diameter (D) by the following formula:
D_p = D / λ
Substituting the given values:
D_p = 5.53 m / 0.48
D_p ≈ 11.48 m
Therefore, the pitch circle diameter of the wheel is approximately 11.48 meters.
e) Specific speed:
The specific speed (N_s) can be calculated using the formula:
N_s = (n * √Q) / (√H^(3/4))
Where:
n = Rotational speed of the turbine (rpm)
The rotational speed (n) can be calculated using the formula:
n = (120 * f) / p
Where:
f = Frequency (Hz)
p = Number of poles
Substituting the given values:
n = (120 * 50 Hz) / 10
n = 600 rpm
Substituting the calculated values into the specific speed formula:
N_s = (600 rpm * √0.053 m³/s) / (√505 m)^(3/4)
N_s ≈ 26.76
Therefore, the specific speed is approximately 26.76.
f) Number of buckets on the wheel:
The number of buckets (B) on the wheel is related to the specific speed (N_s) by the formula:
N_s = (n * B) / (√H^(5/4))
Solving for B:
B = (N_s * √H^(5/4)) / n
Substituting the given values:
B = (26.76 * √505 m^(5/4)) / 600 rpm
B ≈ 43.09
Therefore, the number of buckets on the wheel is approximately 43.
The following true stresses produce the corresponding true plastic strains for a brass alloy: True Stress (psi) True Strain 49300 0.11 61300 0.21 What true stress is necessary to produce a true plastic strain of 0.25
Answers
Answer:
64640.92 psi
Explanation:
True stress ( psi ) True strain
49300 0.11
61300 0.21
Determine the true stress necessary to produce a true plastic strain of 0.25
бT1 = 49300
бT2 = 61300
бT3 = ?
∈T1 = 0.11
∈T2 = 0.21
∈T3 = 0.25
note : бTi = k ∈Ti^h
∴ 49300 = k ( 0.11 )^h ----- ( 1 )
61300 = k ( 0.21)^h ------ ( 2 )
solving equations 1 and 2 simultaneously
49300/61300 = ( 0.11 / 0.21 )^h
0.804 = (0.52 )^h
next step : apply logarithm
log ( 0.804 ) = log(0.52)^h
h = log 0.804 / log (0.52)
= 0.33
back to equation 1
49300 = k ( 0.11 )^0.33
k = 49300 / (0.11)^0.33
= 102138
therefore бT3 = K (0.25)^h
= 102138 ( 0.25 )^ 0.33
= 64640.92
............................
Answers
Answer:
Sorry whats the question
Explanation:
9. Calculate the total resistance and current in a parallel cir-
cuit with three resistors of 4, 8, and 16 ohms, using any
one of the five methods (calculator suggested). What is
the total resistance and current?
a. 27 ohms (0.4 ampere)
b. 14 ohms (0.8 ampere)
c. 4 ohms (3.0 amperes)
d. 2.3 ohms (5.3 amperes)
Answers
Answer:
d. 2.3 ohms (5.3 amperes)
Explanation:
The calculator's 1/x key makes it convenient to calculate parallel resistance.
Req = 1/(1/4 +1/8 +1/16) = 1/(7/16) = 16/7 ≈ 2.3 ohms
This corresponds to answer choice D.
__
Additional comment
This problem statement does not tell the applied voltage. The answer choices suggest that it is 12 V. If so, the current is 12/(16/7) = 21/4 = 5.25 amperes.
1. The hull of the space shuttle consists of ceramic tiles bonded to an aluminum skin. Discuss the design requirements of the shuttle hull that led to the use of this combination of materials. What problems in producing the hull might the designers and manufacturers have faced
Answers
Answer:
Follows are the solution to the given question:
Explanation:
In the environment of the piles of earth, its spacecraft faces extreme temperatures:
Therefore, to prevent satellite build sustainability, a temperature control system must be used.
Its skin must be rather permeable in physiological terms.
Its shuttle's surface should have adhered to both the material well.
Whether it gets broken, it ought to be easy to repair.
All tile mostly on the cutter is composed of silicon dioxide particles, that are bonded and create a tile of very low density.
Its heat transfer is so small that even a person may hold a burning hot side on one side of the tile.
Skin that uses a rubber resin to ensure that perhaps the powers may not release the cutting that heat-treated will then the internal body.
The design requirements that led to the combination of ceramic tiles and aluminium materials for the hull of shuttle space are; discussed below.
The space shuttle experiences extreme temperatures during re-entry into the earths atmosphere. Thus, as a result, a thermal protection system must be provided to help prevent damage of the shuttle structure.
Therefore, the skin must be made up of material that has an exceptionally low thermal conductivity and also the material must be able to be firmly attached to the skin and also be able to be easily repaired in case of any damage.
Secondly, the tiles used on the space shuttle will have to be composed of silica fibers that are bonded together to generate a ceramic of low density. The thermal conductivity of the ceramic would have to be low such that if you touch one end while the other is very hot, you will not feel the hotness.
Now, the tiles will be attached to the shuttle skin with the aid of a rubbery polymer which ensures that the forces don't break the tile loose which will then expose the underlying skin to high temperatures.
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A DVI port transmits a video signal and is also called a DB-15 port.
Answer: True or False
Answers
False.
A DVI (Digital Visual Interface) port is a digital video interface that is used to transmit high-quality video signals from a computer to a display device. It is not called a DB-15 port. A DB-15 port is an older type of connector that was used to transmit analog video signals from a computer to a display device. It is also known as a VGA (Video Graphics Array) port. While both types of ports can transmit video signals, they use different types of signals and are not compatible with each other without the use of an adapter. Therefore, it is important to ensure that the computer and display device have compatible ports to transmit video signals.
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An altarpiece which has a winged, movable panel attached to both sides of the central section is known as a ________, resulting in a total of three panels.
Answers
An altarpiece which has a winged, movable panel attached to both sides of the central section is known as a triptych, resulting in a total of three panels.
What is the history and cultural significance of the triptych form in art?
Triptychs have been used in art for centuries, dating back to medieval times when they were commonly used as altarpieces in churches. The movable panels allowed the central image to be concealed during certain parts of the liturgical calendar, and revealed during others. Over time, the triptych form evolved and became popular in secular art as well. Today, triptychs are still used by many contemporary artists as a way to create a cohesive narrative across multiple panels.
What are some examples of famous triptychs in art history?Some famous examples of triptychs in art history include the "Ghent Altarpiece" by Jan and Hubert van Eyck, the "Isenheim Altarpiece" by Matthias Grünewald, and "The Garden of Earthly Delights" by Hieronymus Bosch. In contemporary art, triptychs are still popular and can be found in a wide range of styles and media.
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It is generally recommended that piercing-type valves be used on what type of tubing materials?
Answers
Answer:
Copper and Aluminum
Explanation:
Discuss how fast memory access of Cortex-M1 improves performance.
Answers
performance here's how memory works on apple silicon
What is the hexadecimal (base 16) value of the decimal 25? A. 11001 B. 19 C. AS D. 20
Answers
Answer:
19
Explanation:
i think this is the right answer
hope it helps :)
2.2.1 A loss-free generator supplies 50 MW to an infinite bus, the steady-
state limit of the system been 100 MW. Determine whether the generator will
remain in synchronism if the prime mover input is abruptly increased by
30 Mw.
Answers
Answer:
Рвоы
Explanation:
Иттің папасы өлңп қалды дейді
Explain what the ancient Romans did to solve the problem in the following scenario.
Situation: In ancient Italy, farmers were experiencing a drought. Rather than move to where the water was, Roman inventors decided to bring the water to the farmers.
Answers
Answer:
They moved fresh water around their vast empire with aqueducts and canals.
Explanation:
which of the following is a typical technology integration strategy based on constructivist learning models?
Answers
Project-based learning is a typical technology integration strategy based on constructivist learning models
Project-based learning is a typical technology integration strategy based on constructivist learning models. In this approach, students engage in hands-on, real-world projects that require them to actively construct their knowledge and understanding of a topic. Technology is integrated into these projects as a tool for research, collaboration, creation, and presentation. Students use digital resources, software applications, online platforms, and multimedia tools to explore, analyze, and communicate their ideas and findings. This strategy promotes student-centered learning, encourages critical thinking, problem-solving, and creativity, and allows for authentic assessment of student learning. By combining constructivist principles with technology, project-based learning enables students to take ownership of their learning, collaborate with peers, and develop essential 21st-century skills needed for success in the digital age.
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Magnetic particle testing can be done only on metals that can be magnetized.
True or false
Answers
A simple ideal Rankine cycle with water as the working fluid operates between the pressure limits of 4 MPa in the boiler and 5 kPa in the condenser and a turbine inlet temperature of 700°C. The boiler is sized to provide a steam flow of 50 kg/s. Determine the power produced by the turbine and consumed by the pump. Use steam tables.
Answers
The pump work = v3.dP = 57.18 x 0.001 x ( 4000 - 20) =227.57 KW
How to solvehere At T1 = 700 C and P1 = 4 Mpa, from steam tabel : h1 =3906.41 KJ/Kg and s1 = 7.62 KJ/Kg.K
now s1 = s2 = 7.62 KJ/Kg.K as 1-2 is isentropic
so at P2 = 20 Kpa and s2 = 7.62 KJ/Kg.K , fom steam table : h2 = 2513.33 KJ/Kg
a) power produced by turbine = m.( h1 - h2) = 57.18 x ( 3906.41 - 2513.33) = 79656.15 KW
b) at P3 = 20 Kpa, 3 = vf = 0.001 m^3/kg
so pump work = v3.dP = 57.18 x 0.001 x ( 4000 - 20) =227.57 KW
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Use NORTHWIND database to perform following queries:
13. Get the Order Count by (Table:Orders)
I. Each Year (Hint: YEAR() function)
ii. Each quarter in each year (Hint: research on DATEPART() function)
iii. Each Month in each year (Hint: research on DATEPART() function)
14. Calculate Average, Total, Minimum, and Maximum Frieght paid (Table:Orders)
i. For each Order
ii. For each Company
iii. For each Country on all orders
iiv. for Each Carrier (ShipVia)
Answers
Get the Order Count by (Table: Orders)
I. Each Year (Hint: YEAR() function)ii. Each quarter in each year (Hint: research on DATEPART() function)iii. Each Month in each year (Hint: research on DATEPART() function)How can I retrieve the order count for each year, each quarter in each year, and each month in each year from the Orders table?To retrieve the order count for each year, each quarter in each year, and each month in each year from the Orders table in the NORTHWIND database, you can use the YEAR() function to group the orders by the year portion of the OrderDate column.
This will provide the order count for each year. To obtain the order count for each quarter in each year, you can use the DATEPART() function to group the orders by both the year and quarter portions of the OrderDate column. Lastly, to get the order count for each month in each year, you can again use the DATEPART() function to group the orders by both the year and month portions of the OrderDate column. These queries will help you analyze the order count trends over different time periods within the database.
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A conceptual issue can be resolved by which of the following?
Answers
Answer:
Investigation or empircial research
Explanation:
gimme brainliest pls
Write a recursive, boolean-valued method, containsVowel, that accepts a string and returns true if the string contains a vowel. A string contains a vowel if: The first character of the string is a vowel, or The rest of the string (beyond the first character) contains a vowel
Answers
The provided recursive method "containsVowel" determines if a string contains a vowel by checking the first character and recursively checking the remaining substring. The "isVowel" helper method identifies if a character is a vowel.
Here is the recursive, boolean-valued method that accepts a string and returns true if the string contains a vowel. A string contains a vowel if: The first character of the string is a vowel, or The rest of the string (beyond the first character) contains a vowel.
```
public static boolean containsVowel(String str) {
if (str.length() == 0) { // empty string doesn't have vowel
return false;
} else if (isVowel(str.charAt(0))) { // check if first character is vowel
return true;
} else { // first character is not vowel, check remaining string
return containsVowel(str.substring(1));
}
}
public static boolean isVowel(char c) {
return "AEIOUaeiou".indexOf(c) != -1;
}
```
The contains Vowel method is a recursive method that returns a boolean value. It takes a string as input. Here is how it works:
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Refrigerant-134a enters a 28-cm-diameter pipe steadily at 200 kPa and 20°C with a velocity of 5.5 m/s. The refrigerant gains heat as it flows and leaves the pipe at 180 kPa and 40°C. The specific volumes of R-134a at the inlet and exit are 0.1142 m3/kg and 0.1374 m3/kg. Determine (a) the volume flow rate of the refrigerant at the inlet, (b) the mass flow rate of the refrigerant, and (c) the velocity and volume flow rate at the exit.
Answers
Answer:
(a) The volume flow rate of the refrigerant at the inlet is 0.3078 m3/s
(b) The mass flow rate of the refrigerant is 2.695 kg/s
(c) The velocity and volume flow rate at the exit is 6.017 m/s
Explanation:
According to the given data we have the following:
diameter of the pipe=d=28 cm=0.28 m
inlet pressure P1=200 kPa
inlet temperature T1=20°C
inlet velocity V1=5.5 m/s
Exit pressure P2=180 kPa
Exit Temperature T2=40°C
a. To calculate the volume flow rate of the refrigerant at the inlet we would have to use the following formula:
V1=AV1
=π/4(0.28∧2)5
V1=0.3078 m3/s
b. To calculate the mass flow rate of the refrigerant we would have to use the following formula:
m=p1 V1
m=V1/v1
=0.3078/0.11418
=2.695 kg/s
c. To calculate the velocity and volume flow rate at the exit we would have to use the following formula:
m=m1=m2
V1/v1=V2/v2
V2=(v2/v1)v1
=(0.13741/0.11418)5
=6.017 m/s