this is the data type (in place of the data type) assigned to a function that returns nothing
Answers
The data type assigned to a function that returns nothing is "void".
In programming languages, such as C++, when defining a function, you need to specify its return type. The return type indicates the type of data that the function will return when called. However, in some cases, a function may not return any data. In such cases, the return type assigned to the function is "void".
The "void" keyword is a special type in C++ that indicates an absence of data. When a function is declared with a "void" return type, it means that the function will not return any value. Instead, it will simply perform the actions specified within the function body and then return control to the calling function.
For example, consider the following C++ function that does not return any data:
void printHello() {
cout << "Hello, world!" << endl;
}
This function simply prints the message "Hello, world!" to the console and then returns. Because the function does not return any data, its return type is "void".
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Related Questions
The student came up with a model that shows a loop of wire being rotated by some external force between two strong, permanent magnets. This causes the charges in the loop to flow. Pole piece Armature Slip ring What did the student make - a model of --
A. a motor B. both a motor and a generator C. neither a motor nor a generator D. a generator
Answers
The model that the student made is a motor. So, the answer is option A.
Key elements in the motor modelThe following are the key elements that the student has used to make a model of a motor:
Pole pieceArmatureSlip ringThe pole pieces are placed on the edges of the strong, permanent magnets.
The Armature is a loop of wire that the student is rotating.
Finally, the slip rings are used to transfer electrical power from the armature to the external source.
With the flow of current in the loop, a magnetic field is established that interacts with the poles of the magnet, causing the armature to spin. The model is similar to a motor as it uses the basic principle of a motor - electromagnetic induction to convert electrical energy into mechanical energy.
Therefore, the student has made a model of a motor..
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What is the formula for Measurement System Subject.
Answers
Answer:
You can see there are four different types of measurement scales (nominal, ordinal, interval and ratio).
Some Important Formulas:
Area of the rectangle, A = L \times B.Area of the square, A =Side ^2.Perimeter of a rectangle, P = 2 \times ( L+B )Perimeter of square, P = 4 \times Side.Area of the triangle, A = \frac{1}{2} \times Base \times Height.Circumference of a Circle, C = 2 \times \pi \times r.Hope this helps!
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Draw an ERD for each of the following situations. (If you believe that you need to make additional assumptions, clearly state them for each situation.) Draw the same situation using the tool you have been told to use in the course. a. A company has a number of employees. The attributes of EMPLOYEE include Employee ID (identifier), Name, Address, and Birthdate. The company also has several projects. Attributes of PROJECT include Project ID (identifier), Project Name, and Start Date. Each employee may be assigned to one or more projects or may not be assigned to a project. A project must have at least one employee assigned and may have any number of employees assigned. An employee's billing rate may vary by project, and the company wishes to record the applicable billing rate (Billing Rate) for each employee when assigned to a particular project. Do the attribute names in this description follow the guidelines for naming attributes? If not, suggest better names. Do you have any associative entities on your ERD? If so, what are the identifiers for those associative entities? Does your ERD allow a project to be created before it has any employees assigned to it? Explain. How would you change your ERD if the Billing Rate could change in the middle of a project? b. A laboratory has several chemists who work on one or more projects. Chemists also may use certain kinds of equipment on each project. Attributes of CHEMIST include Employee ID (identifier), Name, and Phone No. Attributes of PROJECT include Project ID (identifier) and Start Date. Attributes of EQUIPMENT include Serial No and Cost The organization wishes to record Assign Date—that is, the date when a given equipment item was assigned to a particular chemist working on a specified project A chemist must be assigned to at least one project and one equipment item. A given equipment item need not be assigned, and a given project need not be assigned either a chemist or an equipment item. Provide good definitions for all of the relationships in this situation. c. A college course may have one or more scheduled sections or may not have a scheduled section. Attributes of COURSE include Course ID, Course Name, and Units. Attributes of SECTION include Section Number and Semester ID. Semester ID is composed of two parts: Semester and Year. Section Number is an integer (such as 1 or 2) that distinguishes one section from another for the same course but does not uniquely identify a section. How did you model SECTION? Why did you choose this way versus alternative ways to model SECTION? d. A hospital has a large number of registered physicians. Attributes of PHYSICIAN include Physician ID (the identifier) and Specialty. Patients are admitted to the hospital by physicians. Attributes of PATIENT include Patient ID (the identifier) and Patient Name. Any patient who is admitted must have exactly one admitting physician. A physician may optionally admit any number of patients. Once admitted, a given patient must be treated by at least one physician. A particular physician may treat any number of patients, or may not treat any patient& Whenever a patient is treated by a physician, the hospital wishes to record the details of the treatment (Treatment Detail). Components of Treatment Detail include Date, Time, and Results. Did you draw more than one relationship between physician and patient? Why or why not? Did you include hncnithi ac an antitv type? Why or why not?
Answers
Answer:
it wqas red
Explanation:
red
There may be differences between the measured values in an actual process and the theoretical values in the design of that rocess, but they will never be greater than about 5% of the theoretical value unless mistakes were made in the theorebical calculations O True O False
Answers
There may be differences between the measured values in an actual process and the theoretical values in the design of that process, but they will never be greater than about 5% of the theoretical value unless mistakes were made in the theoretical calculations. This statement is True.
The statement "There may be differences between the measured values in an actual process and the theoretical values in the design of that process, but they will never be greater than about 5% of the theoretical value unless mistakes were made in the theoretical calculations" is true because it falls under the rule of thumb that exists in engineering, scientific and statistical calculations whereby there are always going to be differences between theoretical or expected values and the measured values.
However, the difference between the theoretical and measured value should not exceed 5% except mistakes were made during the calculation of the theoretical value.The difference between theoretical values and experimental values are unavoidable, as there are many factors that affect the outcome of experiments such as instrumental and human errors. Therefore, this rule of thumb is necessary for ensuring that the measured values are as close to the theoretical value as possible.
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The statement "there may be differences between the measured values in an actual process and the theoretical values in the design of that process, but they will never be greater than about 5% of the theoretical value unless mistakes were made in the theoretical calculations" is False.
In reality, the difference between measured values and theoretical values can be greater than 5% even if the theoretical calculations were correct.
This is because there are many factors that can affect the actual performance of a process, such as variations in raw materials, equipment performance, and environmental conditions.
Therefore, it is important to perform regular measurements and analyses to ensure that a process is performing as expected and to identify any areas for improvement.
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Engineer drawing:
How can i draw this? Any simple way?
Answers
relationship between civil engineering and geology
Answers
Answer:
Geological and civil engineers sometimes work together, but have very different responsibilities. While geological engineers study the earth's inner and outer surface to evaluate potential mining and infrastructure construction sites, civil engineers design the infrastructure to be built.
how does the 3d model you created compare with what you would expect based on your observations of the simulated mechanisms from the previous activity, including pulley rotation direction, number of rotations made by each of the two pulleys, and limitations of the cad model? pulley mechanism
Answers
The limitations of the CAD model need to be considered when comparing the two mechanisms. Pulley mechanism: A pulley mechanism is a type of mechanical device that uses a wheel with a groove along its edge to move a rope or cable.
The rope or cable is inserted into the groove, and the wheel is rotated. As the wheel rotates, it causes the rope or cable to move. This can be used to lift or move objects.To create a 3D model of a pulley mechanism, one must first understand how the mechanism works. This includes understanding the direction of rotation of the pulley and the number of rotations made by each of the two pulleys. The 3D model should accurately represent these characteristics of the mechanism.The limitations of the CAD model should also be taken into account when comparing the 3D model to the simulated mechanism from the previous activity.
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The A/C compressor will not engage when the A/C is turned on. The static refrigerant pressure is 75 psi and the outside temperature is 72 degrees F. Technician A says that a poor connection at the pressure cycling switch could be the cause. Technician B says that a faulty A/C clutch coil could be the cause. Who is correct
Answers
In the case above, poor connection at the pressure cycling switch and also a faulty A/C clutch coil could be the cause.
What is likely the reason when an A/C compressor will not engage if A/C is turned on?The cause that hinders the A/C Compressor from engaging are:
Due to low pressure lockout.Due to a poor groundDue to bad clutch coil.Dur to an opening in the wire that links to the clutch coil.Due to a blown fuse.Note that the pressure switches is known to be one that control the on/off function of any kind of AC compressor and as such, if there is switch failure, it can hinder the AC compressor from functioning at all.
Therefore, technician A and B are correct.
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which of the following is correct related to the circuit diagram? a. sequential circuit is an interconnection of only logic gates b. sequential circuit is an interconnection of only flip flops c. combinational circuit is an interconnection of flip flops d. combinational circuit is an interconnection of logic gates e. part of a combinational circuit is a sequential circuit.
Answers
Combinational circuit is an interconnection of logic gates.
What is circuit?
Electronic components such as resistors, computer chips, capacitors, inductors, and diodes are linked by conductive wires as well as traces that allow electric current to flow between them. It is a specific kind of electrical circuit, and in order for a circuit to be called electronic rather than electrical, there usually must be at least each active component present. Signals could be amplified, calculations can be made, and data can be transported from one location to another thanks to the combination of parts and wires.
D. Combinational circuit is an interconnection of logic gates. A combinational circuit is a type of digital circuit where the output is determined by the combination of the current inputs. The logic gates are used to implement the desired logic function. A sequential circuit is an interconnection of flip flops. A sequential circuit is a type of digital circuit where the output is determined by the current state, as well as the current inputs. Flip flops are used to store the state of the circuit, and the logic gates are used to implement the desired logic function. Part of a combinational circuit may be a sequential circuit, as a sequential circuit is composed of logic gates and flip flops.
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Fuel-efficient electric and gas/electric hybrid vehicles produce very little sound at normal driving speeds, and are thus difficult for the visually impaired to detect. Does this raise problems for engineers similar to those raised by roundabouts? In what ways are these problems similar? In what ways are they different?
Answers
The issue of electric and hybrid vehicles being difficult for the visually impaired to detect does indeed raise problems for engineers, similar to those raised by roundabouts. Both issues involve the need to balance different design considerations, including safety, accessibility, and sustainability.
One similarity between the problems is that both involve designing for the needs of vulnerable road users, such as the visually impaired or pedestrians. In the case of roundabouts, engineers must consider factors such as crosswalk placement, pedestrian signals, and traffic speeds to ensure that the roundabout is safe and accessible for all users. Similarly, in the case of electric and hybrid vehicles, engineers must consider strategies for making these vehicles more detectable to visually impaired pedestrians, such as adding noise-making devices or using special road markings.
However, there are also some differences between the problems. With roundabouts, the focus is on designing a physical infrastructure that is safe and accessible for all users. With electric and hybrid vehicles, the focus is on designing a vehicle that is both fuel-efficient and safe for all users, including pedestrians. This requires a different set of design considerations and trade-offs.
Another difference is that the problem of electric and hybrid vehicles being difficult to detect is a relatively new issue, while roundabouts have been in use for many years. As a result, the solutions to the problems may require different approaches and may involve more experimentation and testing with new technologies.
Overall, both the issues of roundabouts and electric/hybrid vehicles highlight the need for engineers to consider the needs of all users when designing transportation infrastructure and vehicles. By balancing safety, accessibility, and sustainability, engineers can create solutions that meet the needs of a diverse range of users and help create more inclusive and sustainable communities.
Which sentence from the passage uses passive voice?
Question 9 options:
a)
E-books also make reading easier for people with disabilities. (paragraph 12)
b)
M.K. sees it another way. (paragraph 16)
c)
In one year, e-reader production released 2350 million kilograms of carbon dioxide into the atmosphere. (paragraph 8)
d)
The Diamond Sutra was printed in China in 868 AD. (p
Answers
Answer:
"The Diamond Sutra was printed in China in 868 AD." (paragraph 4)
Explanation:
I took the test
Which of the following refers to the process in which engineers complete and repeat a sequence of steps to come closer to the project goal?
Answers
The process in question is referred to as the iterative design process. Engineers utilize this method by completing and repeating a sequence of steps in order to continually improve and refine their designs as they work towards achieving the project goal. This approach allows for flexibility and adaptability in the design process, as engineers can make adjustments and modifications based on feedback and testing, ultimately leading to a more successful outcome.
There is an AC series circuit that is constructed of a 150.0-ohm resistor along with 300.0 ohm inductive reactance and 200.0 ohm capacitive reactance. What is the difference in phase between the current and resistor voltage of the circuit
Answers
Answer:
0°
Explanation:
The resistor voltage has the same phase as the circuit current. There is no phase difference.
Answer:
0° (zero degree)Explanation:
the difference in pjase between the current and resistor voltage of the given 150.0 ohm, 300.0 ohm and 200.0 ohmAn adult has a total of about 22.3 square feet (ft2) of skin. Use the fact that 1 m is approximately equal to 3.281 feet to convert this measurement to square meters (m2).
Answers
Explanation:
1 meter ≈ 3.281 ft.
so,
1 m² = 1m×1m ≈ 3.281 × 3.281 = 10.764961 ft²
now we have 22.3 ft² of skin.
that would be then
22.3/10.764961 = 2.071535605 ≈ 2.1 m² or even more rounded ≈ 2 m²
A hydrogenation catalyst is prepared by soaking alumina particles (100-150 mesh size) in aqueous NiNO3 solution. After drying and reduction, the particles contain about 7 wt% NiO. This catalyst is then made into large cylindrical pellets for rate studies. The gross measurements for one pellet are: Mass, g 3.15 Diameter, mm 25 Thickness, mm 6 Volume, cm3 3.22 The alumina particles contain micropores, and the pelleting process introduces macropores surrounding the particles. If the macropore volume of the pellet is 0.645 cm3 and the micropore volume is 0.40 cm3 /g of particles, determine: i] The density of the pellet ii] The macropore volume in cm3 /g iii] The macropore void fraction in the pellet iv] The micropore void fraction in the pellet v] The solid fraction vi] The density of the particles
Answers
i] The density of the pellet is 0.977 g/cm^{3}. ii] The macropore volume in cm^{3}/g is 0.205 cm^{3}/g. iii] The macropore void fraction in the pellet is 25.1%.iv] The micropore void fraction in the pellet is 49.0%. v] The solid fraction of the pellet is 25.9%. vi] The density of the particles is 1.222 g/cm^{3}.
i] To determine the density of the pellet, we can use the formula:
Density = Mass / Volume
Given that the mass of the pellet is 3.15 g and the volume is 3.22cm^{3}, we can calculate the density as follows:
Density = 3.15 g / 3.22 cm^{3}≈ 0.977 \(g/cm^{3\)
ii] The macropore volume in cm3/g can be calculated by dividing the macropore volume of the pellet (0.645 cm3) by the mass of the pellet (3.15 g):
Macropore volume = 0.645 cm^{3} / 3.15 g ≈ 0.205 \(cm^{3} /g\)
iii] The macropore void fraction in the pellet can be calculated using the formula:
Macropore void fraction = Macropore volume / Total volume of the pellet
Total volume of the pellet = Volume - Macropore volume = 3.22 cm^{3}- 0.645 cm^{3} = 2.575 cm^{3}
Macropore void fraction = 0.645 cm^{3} / 2.575 \(cm^{3}\)≈ 0.251 or 25.1%
iv] The micropore void fraction in the pellet can be calculated using the given micropore volume of the particles (0.40 cm^{3} /g) and the mass of the pellet (3.15 g):
Micropore volume in the pellet = Micropore volume/g x Mass
Micropore volume in the pellet = 0.40 \(cm^{3} /g\) x 3.15 g = 1.26 cm3
Micropore void fraction = Micropore volume in the pellet / Total volume of the pellet
Micropore void fraction = 1.26 \(cm^{3}\) / 2.575 \(cm^{3}\) ≈ 0.490 or 49.0%
v] The solid fraction of the pellet can be calculated by subtracting the sum of macropore and micropore void fractions from 1:
Solid fraction = 1 - (Macropore void fraction + Micropore void fraction)
Solid fraction = 1 - (0.251 + 0.490) ≈ 0.259 or 25.9%
vi] The density of the particles can be determined using the mass of the pellet (3.15 g) and the total volume of the particles:
Total volume of the particles = Volume - Macropore volume = 3.22 \(cm^{3}\)- 0.645 \(cm^{3}\) = 2.575\(cm^{3}\)
Density of the particles = Mass / Total volume of the particles
Density of the particles = 3.15 g / 2.575\(cm^{3}\) ≈ 1.222 \(g/cm^{3}\)
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The reading on the 0 to 25 mm micrometer provided is
A. 15.20
B. 15.70
C. 15.45
D. 0.1520
Answers
Based on the image attached, the reading of micrometer is= 15.20.
What do the numbers on a micrometer represent?You will see a line of numbers running down the barrel of your micrometer, starting with the barrel scale. On the barrel scale, each number corresponds to 0.100. Looking at the barrel, 1 equals 0.100, 2 equals 0.200, 3 equals 300, and so on. The distance between each tick mark and the larger numbers on the barrel is 0.025, or 25 thousandths.
Note that micrometer is one that is also referred to as a micrometer screw gauge—is a tool with a calibrated screw that is frequently used for precise measurement of components in mechanical engineering, and others.
Looking at the image, you will see the stop ends at 15 and and 20 so adding them together will be option A. 15.20.
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what are arrows shot from untuned bows likely to do?
Answers
Arrows shot from untuned bows are likely to have inconsistent and inaccurate flight paths.
When a bow is not properly tuned, it means that the various components of the bow (limbs, string, and arrow rest) are not working in harmony, leading to imprecise arrow release. Consequently, arrows shot from untuned bows may wobble, drift, or experience "porpoising" is up and down oscillation during flight. These irregularities can cause the arrow to miss the intended target or have unpredictable impact points. Therefore, it is crucial to tune a bow properly to ensure better arrow flight, improved accuracy, and overall enhanced shooting performance.
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A ______ is a point, surface, or line used as a reference for measuring elevation.
Answers
Answer:
A benchmark is a point, surface, or line used as a reference for measuring elevation.
Explanation:
Describe how you would control employee exposure to excessive noise in a mining environment
Answers
Answer:
1. Buy Quiet – select and purchase low-noise tools and machinery
2. Maintain tools and equipment routinely (such 3. as lubricate gears)
3. Reduce vibration where possible
4. Isolate the noise source in an insulated room or enclosure
5. Place a barrier between the noise source and the employee
6. Isolate the employee from the source in a room or booth (such as sound wall or window
Explanation:
Hope my answer will help u.
When a pungent odor is detected during a sealed system recovery and/or repair which of the following is most likely
Answers
Answer: A leak in the system
Explanation:
a 0.505-in.diameter metal bar with a 2-in. gauge length l0 is subjected to a tensile test. the following measurements are made in the plastic region. determine the strain hardening exponent for the metal.
Answers
The strain hardening exponent for the metal can be determined based on the given measurements in the plastic region of the tensile test conducted on the 0.505-inch diameter metal bar with a 2-inch gauge length.
How can the strain hardening exponent be calculated using the measurements from the plastic region of the tensile test?The strain hardening exponent characterizes the relationship between the true stress and true strain in the plastic region of a material. To determine the strain hardening exponent for the metal, we need to analyze the measurements obtained during the tensile test. The true stress and true strain can be calculated using the following formulas:
True Stress = Load / Area
True Strain = ln(Original Gauge Length / Final Gauge Length)
By plotting the true stress and true strain data on a logarithmic scale, we can determine the slope of the resulting curve. This slope represents the strain hardening exponent, denoted by "n." The strain hardening exponent indicates how the material's strength increases as deformation occurs. By analyzing the given measurements in the plastic region, we can calculate the strain hardening exponent for the metal bar.
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_____ occur when warm, dry wind flows down a slope, whereas _____ occur when cold, dense air flows down a slope.
Answers
Chinook winds occur when warm, dry wind flows down a slope, whereas katabatic winds occur when cold, dense air flows down a slope.
What are Chinook winds?Chinook winds, sometimes known as 'Chinooks,' are two types of predominantly warm, mainly westerly winds in western North America: coastal Chinooks and inland Chinooks. The coastal Chinooks are rainy, southwesterly winds that come in from the ocean on a seasonal basis.
On the other hand, a katabatic wind is a draining wind, which transports high-density air from a higher height down a slope using gravity. Such winds are sometimes known as autumn winds; the term catabatic winds is often used.
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List the five lines that include short dashes.
Answers
Answer:
OBJECTLINE
HIDDEN LINE
SECTION LINE
CENTER LINE
Explanation:
Refrigerant 134a vapor in a piston-cylinder assembly undergoes a process at constant pressure from an initial state at 8 bar and 50°C to a final state at which the refrigerant is saturated vapor. For the refrigerant, determine the work and heat transfer, per unit mass, each in kJ/kg. Any changes in kinetic and potential energy are negligible.
Answers
Answer:
- Work done is 2.39 kJ
- heat transfer is 20.23 kJ/kg
Explanation:
Given the data in the question;
First we obtain for specific volumes and specific enthalpy from "Table Properties Refrigerant 134a;
Specific Volume v₁ = 0.02547 m³/kg
Specific enthalpy u₁ = 243.78 kJ/kg
Specific Volume V₂ = 0.02846 m³/kg
Specific enthalpy u₂ = 261.62 kJ/kg
p = 8 bar = 800 kPa
Any changes in kinetic and potential energy are negligible.
So we determine the work done by using the equation at constant pressure
]Work done W = p( v₂ - v₁ )
we substitute
W = 800 kPa( 0.02846 m³/kg - 0.02547 m³/kg )
W = 800 kPa( 0.00299 m³/kg )
W = 2.39 kJ
Therefore, Work done is 2.39 kJ
Heat transfer;
using equation at constant pressure
Heat transfer Q = W + ( u₂ - u₁ )
so we substitute
Q = 2.392 kJ + ( 261.62 kJ/kg - 243.78 kJ/kg )
Q = 2.392 kJ + 17.84 kJ/kg )
Q = 20.23 kJ/kg
Therefore, heat transfer is 20.23 kJ/kg
A forklift will tip over if the center of gravity is outside the stability triangle. True or false?
Answers
Answer:
True
Explanation:
A forklift will tip over if the center of gravity is outside the stability triangle. The stability triangle refers to the area within the three wheels of a forklift that ensures the stability of the machine and prevents tipping. If the center of gravity of the load being carried by the forklift moves outside of the stability triangle, the machine becomes unstable and is at risk of tipping over. It's important to properly balance the load on a forklift and ensure that the center of gravity stays within the stability triangle to avoid accidents and maintain safety.
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The average July high temperature is 85 degrees Fahrenheit in New York City, 88 degrees in Denver, and 106 degrees in Pheonix. Write a C++ program that calculates and reports what the new average high July temperature would be for each of these cities if temperatures to rise by 2 percent (program comments would be ideal)
Answers
Here is the C++ program that calculates and reports the new average high July temperature
#include #include //for setprecision() using namespace std; int main() { const double RISE = 0.02; double nyTemp = 85.0, denTemp = 88.0, phTemp = 106.0; //calculate new temperatures nyTemp += nyTemp * RISE; denTemp += denTemp * RISE; phTemp += phTemp *
The output will be:
New York City: 86.70 degrees Fahrenheit.
Denver: 89.76 degrees Fahrenheit.
Phoenix: 108.12 degrees Fahrenheit.
Program comments are also included in the code.
In this program, we declared and initialized the average July high temperatures for each of the three cities. Then we calculated the new temperatures with a 2% increase and stored them in new variables. Finally, we output the new temperatures with two decimal places.
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. consider the following two signals: ( 1 )n+ i xj [n] = 2 u[n + 1], ( 1 )n x2[n] = 4 u[n]. let x 1 (z) and x1 (z) respectively be the unilateral and bilateral z-transforms of x 1 [n], and let x2(z) and x2(z) respectively be the unilateral and bilateral ztransforms of x2 [ n]. (a) take the inverse bilateral z-transform of x1 (z)x2(z) to determine g[n] = xj [n] * x2[n]. (b) take the inverse unilateral z-transform ofx1(z)x2(z) to obtain a signal q[n] for n 2: 0. observe that q[n] and g[n] are not identical for n 2: 0.
Answers
(a) The inverse bilateral z-transform of x1(z) * x2(z) is g[n] = 8 * n * u[n-1].
(b) The inverse unilateral z-transform of x1(z) * x2(z) is q[n] = 8 * n * u[n].
The given question is asking about the inverse bilateral z-transform and the inverse unilateral z-transform of two signals.
Let's break down the steps to find the answers.
(a) To find the inverse bilateral z-transform of x1(z) * x2(z), we need to multiply the z-transforms of x1[n] and x2[n].
- The z-transform of x1[n] is x1(z) = 2/(z-1), and the z-transform of x2[n] is x2(z) = 4/(z-1).
- Multiplying these two z-transforms, we get g(z) = x1(z) * x2(z) = 8/(z-1)^2.
Now, we need to find the inverse bilateral z-transform of g(z).
- Using the formula for the inverse bilateral z-transform, we have g[n] = 8 * n * u[n-1].
(b) To find the inverse unilateral z-transform of x1(z) * x2(z), we again need to multiply the z-transforms of x1[n] and x2[n].
- The z-transform of x1[n] is x1(z) = 2/(z-1), and the z-transform of x2[n] is x2(z) = 4/(z-1).
- Multiplying these two z-transforms, we get q(z) = x1(z) * x2(z) = 8/(z-1)^2.
Now, we need to find the inverse unilateral z-transform of q(z).
- Using the formula for the inverse unilateral z-transform, we have q[n] = 8 * n * u[n].
It is important to note that q[n] and g[n] are not identical for n >= 0.
In summary:
(a) The inverse bilateral z-transform of x1(z) * x2(z) is g[n] = 8 * n * u[n-1].
(b) The inverse unilateral z-transform of x1(z) * x2(z) is q[n] = 8 * n * u[n].
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When the psychologist simply records the relationship between two variables...
Answers
The observed relationship does not by itself reveal which variable causes the other. This is the directionally problem. Also, the relationship may be due to a third variable controlling both of the observed variables.
Relationship between two variables.
The experimental research in psychology aims to analyze the relationships between the various variables. There are two variables such s independent and the dependent variable. The independent in the manipulated variable. Depended is measurable.
Thus the two variables are independent and dependent.
The psychologist can make use of the observations and survey method to record the source of the variables. Such as the independent variable depends on the dependent variable such as a rise in temperature will lead to dryness. The drop in temperature will lead to the cooling effect.Thus the two variables can be recorded by the psychologist.
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Which of the following devices is a simple machine?
A.
an engine
B.
a pulley
C.
a motor
D.
a bicycle
E.
a crane
Answers
Answer:
A PULLY
Explanation:
HAD THIS ONE THAT IS THE CORRECT ANWSER
Answer:
The answer is B. a pulley
Explanation:
I hope I answered your question:)
A pump is positioned at 2 m above the water of the reservoir. The inlet of the pipe connected to the pump is positioned at 6m beneath the water of the reservoir. When a pump draws 220 m3/hour of water at 20 °C from a reservoir, the total friction head loss is 5 m. The diameter of the pipe connected to the inlet and exit nozzle of the pump is 12 cm and 5 cm, respectively. The flow discharges through the exit nozzle to the atmosphere. Calculate the pump power in kW delivered to the water.
Answers
Answer:
The pump delivers 32.737 kilowatts to the water.
Explanation:
We can describe the system by applying the Principle of Energy Conservation and the Work-Energy Theorem, the pump system, which works at steady state and changes due to temperature are neglected, is represented by the following model:
\(\dot W_{in} + \dot m \cdot g \cdot (z_{1}-z_{2}) + \frac{1}{2}\cdot \dot m \cdot (v_{1}^{2}-v_{2}^{2})+\dot m \cdot [(u_{1}+P_{1}\cdot \nu_{1})-(u_{2}+P_{2}\cdot \nu_{2})]-\dot E_{losses} = 0\) (Eq. 2)
Where:
\(\dot m\) - Mass flow, measured in kilograms per second.
\(g\) - Gravitational acceleration, measured in meters per square second.
\(z_{1}\), \(z_{2}\) - Initial and final heights, measured in meters.
\(v_{1}\), \(v_{2}\) - Initial and final flow speeds at pump nozzles, measured in meters per second.
\(u_{1}\), \(u_{2}\) - Initial and final internal energies, measured in joules per kilogram.
\(P_{1}\), \(P_{2}\) - Initial and final pressures, measured in pascals.
\(\nu_{1}\), \(\nu_{2}\) - Initial and final specific volumes, measured in cubic meters per kilogram.
Then, we get this expression:
\(\dot W_{in} + \dot m \cdot g \cdot (z_{1}-z_{2}) +\frac{1}{2}\cdot \dot m \cdot (v_{1}^{2}-v_{2}^{2}) +\dot m\cdot \nu \cdot (P_{1}-P_{2})-\dot E_{losses} = 0\) (Ec. 3)
We note that specific volume is the reciprocal of density:
\(\nu = \frac{1}{\rho}\) (Ec. 4)
Where \(\rho\) is the density of water, measured in kilograms per cubic meter.
The initial pressure of water (\(P_{1}\)), measured in pascals, can be found by Hydrostatics:
\(P_{1} = P_{atm} + \rho\cdot g \cdot \Delta z\) (Ec. 5)
Where:
\(P_{atm}\) - Atmospheric pressure, measured in pascals.
\(\Delta z\) - Depth of the entrance of the inlet pipe with respect to the limit of the water reservoir.
If we know that \(p_{atm} = 101325\,Pa\), \(\rho = 1000\,\frac{kg}{m^{3}}\), \(g = 9.807\,\frac{m}{s^{2}}\) and \(\Delta z = 6\,m\), then:
\(P_{1} = 101325\,Pa+\left(1000\,\frac{kg}{m^{3}} \right)\cdot \left(9.807\,\frac{m}{s^{2}})\cdot (6\,m)\)
\(P_{1} = 160167\,Pa\)
And the specific volume of water (\(\nu\)), measured in cubic meters per kilogram, is: (\(\rho = 1000\,\frac{kg}{m^{3}}\))
\(\nu = \frac{1}{1000\,\frac{kg}{m^{3}} }\)
\(\nu = 1\times 10^{-3}\,\frac{m^{3}}{kg}\)
The power losses due to friction is found by this expression:
\(\dot E_{losses} = \dot m \cdot g\cdot h_{losses}\)
Where \(h_{losses}\) is the total friction head loss, measured in meters.
The mass flow is obtained by this:
\(\dot m = \rho \cdot \dot V\) (Ec. 6)
Where \(\dot V\) is the volumetric flow, measured in cubic meters per second.
If we know that \(\rho = 1000\,\frac{kg}{m^{3}}\) and \(\dot V = 0.061\,\frac{m^{3}}{s}\), then:
\(\dot m = \left(1000\,\frac{kg}{m^{3}}\right)\cdot \left(0.061\,\frac{m^{3}}{s} \right)\)
\(\dot m = 61\,\frac{kg}{s}\)
Then, the power loss due to friction is: (\(h_{losses} = 5\,m\))
\(\dot E_{losses} = \left(61\,\frac{kg}{s}\right)\cdot \left(9.807\,\frac{m}{s^{2}} \right) \cdot (5\,m)\)
\(\dot E_{losses} = 2991.135\,W\)
Now, we calculate the inlet and outlet speed by this formula:
\(v = \frac{\dot V}{\frac{\pi}{4}\cdot D^{2} }\) (Ec. 7)
Inlet nozzle (\(\dot V = 0.061\,\frac{m^{3}}{s}\), \(D = 0.12\,m\))
\(v_{1} = \frac{0.061\,\frac{m^{3}}{s} }{\frac{\pi}{4}\cdot (0.12\,m)^{2} }\)
\(v_{1} \approx 5.394\,\frac{m}{s}\)
Oulet nozzle (\(\dot V = 0.061\,\frac{m^{3}}{s}\), \(D = 0.05\,m\))
\(v_{2} = \frac{0.061\,\frac{m^{3}}{s} }{\frac{\pi}{4}\cdot (0.05\,m)^{2} }\)
\(v_{2} \approx 31.067\,\frac{m}{s}\)
(\(\dot m = 61\,\frac{kg}{s}\), \(g = 9.807\,\frac{m}{s^{2}}\), \(z_{2} = 2\,m\), \(z_{1} = -6\,m\), \(v_{2} \approx 31.067\,\frac{m}{s}\), \(v_{1} \approx 5.394\,\frac{m}{s}\), \(P_{2} = 101325\,Pa\), \(P_{1} = 160167\,Pa\), \(\dot E_{losses} = 2991.135\,W\))
\(\dot W_{in} = \left(61\,\frac{kg}{s}\right)\cdot \left(9.807\,\frac{m}{s^{2}} \right)\cdot [2\,m-(-6\,m)]+\frac{1}{2}\cdot \left(61\,\frac{kg}{s}\right) \cdot \left[\left(31.067\,\frac{m}{s} \right)^{2}-\left(5.394\,\frac{m}{s} \right)^{2}\right] +\left(61\,\frac{kg}{s}\right)\cdot \left(1\times 10^{-3}\,\frac{m^{3}}{kg} \right)\cdot (101325\,Pa-160167\,Pa)+2991.135\,W\)
\(\dot W_{in} = 32737.518\,W\)
The pump delivers 32.737 kilowatts to the water.