Most input controls are designed to assess one field only, which of the following input controls will need to examine a record to determine the control is effective or not? Multiple Choice O Validity check O Range check O Completeness check.
O size check
Answers
Among the given input controls, the completeness check is the input control that will need to examine a record to determine the control is effective or not.
The correct answer is C) Completeness Check.
Input controls are the measures taken by organizations or individuals to verify that data input into a system is accurate, complete, and appropriate. Data input errors, omissions, or unauthorized modifications are prevented by the use of input controls. A completeness check is a type of input control. It ensures that all required fields are completed and that the input data is complete. Completeness checks evaluate each record to see whether it contains all the necessary data, as well as whether each field's value is valid. Completeness checks are a good tool for detecting data entry omissions.
Therefore, the given input control, completeness check will need to examine a record to determine whether the control is effective or not. Hence, the correct answer is the Completeness check.
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Related Questions
In this lab, you'll practice creating classes and objects, using ArrayList objects, and working
with interacting objects (with some nice visuals). Even better, you'll be working with circles,
widely considered to be the roundest of all two-dimensional shapes.
1. Import the starter code to begin. Instructions (if needed), for your IDE of choice:
a. Jgrasp:
i. Download the starter code folder from the website (Download -> Direct download).
ii. Extract (unzip) the downloaded folder (right-click -> Extract all).
iii. Copy the entire (unzipped) folder to your H: drive; rename it in the usual fashion.
b. Eclipse:
i. In Eclipse, create a new Java project named in the usual fashion.
ii. Download the starter code folder from the website (Download -> Direct download).
iii. Extract (unzip) the downloaded folder (right-click -> Extract all).
iv. Drag and drop the unzipped materials as follows:
1. Drag the source (*.java) files into the "src" folder.
2. See here for help (don't worry about text files): youtu.be/LOSICIeP6Ko
2. Create a class Circle.java which is a simple abstraction of an on-screen circle (image). A Circle
should (initially) have the following:
int x and int y The center point of the circle's on-screen location. These values represent
the circle's (initial) location on screen.
int radius The radius of the circle.
Color color The color of the circle. Color is a class that is built into Java, a software
abstraction of color. You can create a new color using Color's
three-parameter constructor (e.g. new Color(50, 100, 150)), where
each integer is a value 0-255 (corresponding to red, green, and blue
components, respectively). There are also pre-built colors in the Color class
that you can use, e.g. Color.RED or Color.BLACK. Import:
java.awt.Color.
3. Write Circle's 4-parameter constructor. Give the parameter variables real good names.
4. A Circle is responsible for drawing itself. Write a void draw() method that displays the circle on
screen using the StdDraw.java graphics library (included in starter code). Use the following:
StdDraw.setPenColor(color); //set the current color of the drawing window
StdDraw.filledCircle(x, y, radius); //draw a filled circle at , diam of radius*2
Page 1 of 5
5. The CircleAnimations class performs some on-screen animations using Circle objects; we say
CircleAnimations is a client of the Circle class.
a. CircleAnimations' constructor has been written for you. Nice! Look it over so you know what
variables a CircleAnimations object will have. For example, this class maintains a list of all the
circles currently in the animation.
6. In CircleAnimations, write a method void drawCircles() that will iterate through all objects in
the circles list and draw them to the screen. The drawCircles method should be called last
from any method that adds circles to the list or makes changes to the circles so that the results
appear on screen. You don't need to test this method quite yet.
7. In CircleAnimations, write a method void addCircles() that will add three randomly colored
circles with random locations to the circles list. Note: The size of the drawing window is saved
into CircleAnimations' size instance variable. Choose a random radius range you feel best
represents you as a person.
Answers
In this workshop you will practice creating classes and objects, using Array.
List objects and working with interactive objects (with nice visual effects). You'll also work with circles, widely considered to be the roundest of all two-dimensional shapes. First, import your startup code. Instructions (if required) for the selected IDE: a. Jack: Me. Download the boot code folder from the website (Download -> Direct Download).ii. Extract (extract) the downloaded folder (right click -> extract all).iii. Copy the entire folder (unzipped) to drive H:; Rename it as usual. Eclipse: i. In Eclipse, create a new Java project with the usual name. ii. Download the initial code folder from the website (Download -> Direct Download).iii. Extract (extract) the downloaded folder (Right Click ->Extract All).iv. Drag the extracted materials as follows Drag & Drop: 1. Put the source files (*.java) in the "src" folder. Here's some help (don't worry about text files): youtu.be/LOSICIeP6Ko 2. Create a Circle.java class that is a simple abstraction of a circle (image) on the screen. The circle should (initially) have the following values: int x and int y The center of the circle's position on the screen. These values represent the starting position of the circle on the screen. In this workshop you will practice creating classes and objects, using Array List objects and working with interactive objects (with nice visual effects). You'll also work with circles, widely considered to be the roundest of all two-dimensional shapes. First, import your startup code. Instructions (if required) for the selected IDE: a. Jack: Me. Download the boot code folder from the website (Download -> Direct Download).ii. Extract (extract) the downloaded folder (right click -> extract all).iii. Copy the entire folder (unzipped) to drive H:; Rename it as usual. Eclipse: i. In Eclipse, create a new Java project with the usual name. ii. Download the initial code folder from the website (Download -> Direct Download).iii. Extract (extract) the downloaded folder (Right Click ->Extract All).iv. Drag the extracted materials as follows Drag & Drop: 1. Put the source files (*.java) in the "src" folder. Here's some help (don't worry about text files): youtu.be/LOSICIeP6Ko 2. Create a Circle.java class, which is a simple abstraction of a circle (image) on the screen.
The circle should (initially) have the following values: int x and int y The center of the circle's position on the screen. These values represent the starting position of the circle on the screen.
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Laws vs Morals vs Ethics Q No. 1 Consider the Following Scenario ? Speeding on Motorway • Illegal, moral ("everyone" does it), maybe ethical Speeding within city • Illegal, immoral(dishonest), unethical What might a software engineer do that is… • Illegal, immoral, unethical ? • Legal, immoral, unethical ? • Legal, moral, unethical ? Q No. 2 By Considering 8 Principles of IEEE Code of Ethics, How would you respond in a way that is legal, moral, and ethical for the following scenarios? 1. You are the owner of a software engineering company. Your employees (engineers) want you to let them do pro bono work for a local non-profit organization on company time. 2. You are the head of a computer science department at a university. Your boss (a "dean") wants you to find a way to change your curriculum so undergrads are more likely to choose your department for their major. 3. You are a software engineer working at a large publicly-traded corporation, where a colleague invents a new kind of compiler. Your managers see it as a huge potential cash cow. 4. You are a software engineer at a company where management routinely encourages you and your colleagues to use pirated software
Answers
A software engineer might engage in any of the following activities that could be deemed illegal, immoral, and unethical:
Software piracy, security breaches, data theft, software spying or snooping, creating viruses or other harmful code, intentionally producing defective code, and knowingly releasing software with bugs or security flaws.
Creating software that serves a beneficial social or moral purpose, such as software that promotes environmental sustainability, public safety, and public health. Software that serves the public good is legal, but some software might have unintended or unforeseen ethical implications.
According to the IEEE code of ethics, engineers should support and participate in pro bono and charitable work that promotes the public good. Therefore, as a software engineering company owner, you should allow your employees to do pro bono work on company time as long as it does not interfere with their assigned tasks or affect the company's productivity.
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Where would an engineer indicate the unit of measurement used in a design
Answers
An engineer would indicate the unit of measurement used in a design in millimeters.
What are measurements?The primary unit of measurement is the stocking unit of measure for a given item in a specific organization. You must define an item attribute that serves as the primary unit of measurement when creating each item.
Because the technical drawings are scaled, engineers, architects, and builders may create the items according to exact specifications.
When understanding scales, the number on the left relates to the measurement of the drawing, while the number on the right represents the actual size of the object.
Therefore, a millimeter is used in a design.
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What is the best air duct cleaning robot?
The term "best" means if it takes a week to do something manually, which will work fastest? By "duct cleaning", I mean it has to be able to carry and manipulate a pneumatic or electric brush or air whip, and the more it can do the better, like holding a vacuum and something to spray disinfectant/sealant/some sort of chemical. How long it will last before ultimately breaking and upkeep on it also, I guess that's a question of which has the best construct. Also what it drives on, if it can go up and down slopes etc.
So all that means another question is what would be the factors to determine which is the best air duct cleaning robot? The only robot that is sold that is even worth having is ANATROLLER ARI-100 and 50 for ships, but private companies like Advance Air Duct Cleaning told me they have the best ones, so I want to see if anyone knows private companies that invented something that can handle the very tight space with lots of bumps and inclines while there is negative pressure and while brushing, without damaging the thing. Don't show toys that get pulled away by the 6000 CFM suction dust collector vacuum or something you made yourself and never tested in a real job, I don't want an ad, just a practical technology comparison.
Answers
The best air duct cleaning robot is called Multibot according to the given preferences in the question.
What is Multibot?
An all-purpose bot, MultiBot has numerous commands for economy, entertainment, gaming, utility, and moderation. This bot was developed for guilds that desired a bot with versatile commands.
What are a few characteristics of a Multibot cleaning robot?
1. Modular Design
2. Versatile
3. Robust and Reliable
What are the characteristics of ANATROLLER ARI-100?
1. using just one wire to connect integrating robot control and air intake
2. robotic tilt-resistant
3. sturdy, modular, and symmetrical design
4. Robot that is small and light, weighs only 6 kg.
A file is attached for the view of a multiboot.
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all electrical service distribution equipment is labeled with its maximum voltage and current ratings . select one: a. true b. false
Answers
The voltage range and current consumption at which an electrical device is intended to function are both disclosed in its rating. Normally, a rating plate that is attached to the device displays these figures, such as 230 volts, 3 amps.
Explain about the maximum voltage and current ratings?
For products lacking a protective element at the VCC side, voltages up to the absolute maximum rated supply voltage (i.e., VEE+36V) can be delivered, independent of supply voltage. In general, the absolute maximum common-mode voltage is VEE-0.3V and VCC+0.3V.
The chip's maximum ratings are the harsh conditions to which it can be subjected for a brief period of time without suffering long-term harm. Long-term exposure to absolute maximum ratings may have an impact on a device's dependability.
(Krnt Rest) (Electrical engineering: Circuits, Electrical power) The greatest current that a fuse is rated to carry for an infinite duration without significantly degrading the fuse element is known as the current rating.
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The big ben clock tower in london has clocks on all four sides. If each clock has a minute hand that is 11.5 feed in length, how far does the tip of each hand travel in 52 minutes?
Answers
Answer:
Updated question
The big ben clock tower in London has clocks on all four sides. If each clock has a minute hand that is 11.5 feet in length, how far does the tip of each hand travel in 52 minutes?
The distance traveled by the tip of the minute hand of the clock would be 62.59 ft
Explanation:
Let us assume the shape of the clock is circular.
the minute hand is equal to the radius = 11.5 ft
Diameter = radius x 2
Diameter = 11.5 x 2 = 23 ft
The distance traveled by the tip of the minute hand can be calculated thus;
the fraction of the circumference traveled by the minute hand would be;
52/60 = 0.8667
Circumference of the clock would be;
C = pi x d
where C is the circumference
pi is a constant
d is the diameter
C = 3.14 x 23
C = 72.22 ft
Therefore the fraction of the circumference covered by the minute hand would be;
72.22 ft x 0.8667 = 62.59 ft
Therefore the distance traveled by the tip of the minute hand of the clock would be 62.59 ft
4. A banking system provides users with several services:
(a) to check their accounts to see recent transactions and balances;
(b) to pay bills online;
(c) to buy and sell investments.
All of these services require a secure log-in. If the system crashes or the network
connection fails during a transaction, all the financial data must be left in a consistent
state.
a. Draw use case diagrams for these requirements. Use standard symbols and shapes. MS
Office Visio, Lucidchart, draw.io, Creately, Smartdraw or Figma are optional tools
b. Give the use case specification for paying a bill online.
Answers
A diagram showing a use case diagrams for these requirements is given in the image attached.
What is system Case diagram?A use case diagram is known to be a kind of graphical illustration of a users in terms of their various possible association or interactions within any given system.
A use case diagram in banking can be used to prepare, depict and also to know all the functional requirements of the banking system.
Therefore, Give the use case specification for the banking system services and paying a bill online is given in the image attached.
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the board is subjected to a tensile force of 300lb. determine the average normal and average shear stress in the the wood fibers
Answers
The average normal and average shear stress in the the wood fibers are 23.29 and 12.052
Tensile force =300lb
Σfx=0: V-300 cos20°=0 F = force
v=281.90 l b V = value
Σf^4: N-300sin20°=0 N = number of units
N=102.606 l b
A=2(4/SIN20)=23.39IN^ 2 A = average normal
σ=N/A= 102.606/23.39=4.386 PSI. σ = standard deviation
V/A=281.90/23.39=12.052 Psi. Average sher stress
Tensile force refers to the stretching forces that act on a material and consists of two components: tensile stress and tensile strain. This means that the material being acted upon is under tension, and the forces are attempting to stretch it.
When a tensile force is applied to a material, a stress corresponding to the applied force develops, contracting the cross-section and elongating the length.
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what does the mechanical hound look like in fahrenheit 451
Answers
In Fahrenheit 451, Ray Bradbury introduces a dystopian novel featuring a mechanical hound, a fearsome and relentless machine designed to eliminate books-related crimes.
What is the description of the mechanical hound in the book?The hound, resembling a large dog, has a six-legged body and emits a green light. Its synthetic body is heat-resistant and fireproof, and it moves swiftly, chasing targets with great speed.
The hound emits a constant mechanical hum, adding to its eerie presence. The mechanical hound serves as a menacing enforcer of the oppressive regime in Fahrenheit 451.
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MegaPress Carbon Steel fittings with Green Dots can be used in potable water applications?
Answers
Yes, MegaPress Carbon Steel fittings with Green Dots can be used in potable water applications. The Green Dot indicates that the fitting is lead-free and meets the requirements for potable water applications.
It is important to follow all manufacturer instructions and local codes and regulations when installing and using these fittings.
MegaPress Carbon Steel fittings with green dots are not suitable for potable water applications. These fittings are designed for use in gas and mechanical systems. For potable water applications, it is recommended to use fittings specifically designed and approved for that purpose, such as those made from copper or other materials compatible with drinking water systems.
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According to the EPA, at what level does radon become a health concern requiring mitigation?
A. 1.4 picocuries per liter of air
B. 2.4 picocuries per liter of air
C. 4.0 picocuries per liter of air
D. .04 picocuries per liter of air
Answers
According to the EPA, the level at which radon becomes a health concern requiring mitigation is 4.0 picocuries per liter of air. The Option C.
At what level does radon become a health concern?Radon is a naturally occurring radioactive gas that can seep into homes and buildings through cracks in the foundation. Prolonged exposure to high levels of radon can increase the risk of developing lung cancer.
The EPA has set a recommended action level of 4.0 picocuries per liter of air. When radon levels exceed this threshold, it is considered a health concern and mitigation measures should be taken to reduce radon concentrations.
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Joseph wants to practice architecture. Which compulsory assessment administered by NCARB does he need to complete?
Answers
Answer:
Architect Registration Examination (ARE)
Explanation:
In this scenario, Joseph wants to practice architecture. A compulsory assessment administered by National Council of Architectural Registration Boards (NCARB) which he has to complete is an Architect Registration Examination.
An Architect Registration Examination (ARE) refers to the professional licensure examination to be taken by anyone who intends to practice architecture in the United States of America, Puerto Rico, Guam, Canada, US Virgin Islands.
The main purpose of the Architect Registration Examination is to assess an architect's knowledge, skills, and abilities on architectural best practices, procedures and services. Also, it focuses on areas relating to a building's safety, soundness and health impact on the habitants. Therefore, ARE is a prerequisite for practicing architecture across the United States of America jurisdiction.
Once an architect passes the examination, he or she would be given a license to practice architecture.
Hence, for Joseph to practice architecture he must take the Architect Registration Examination developed and administered by National Council of Architectural Registration Boards (NCARB).
Answer:
Explanation:
The guy above me got the answer right, just noting that typing in ARE gets it correct.
a 4-m-long beam is subjected to a variety of loadings. (a) replace each loading with an equivalent force-couple system at end a of the beam. (b) which of the loadings are equivalent?
Answers
After the replacement of loading with equivalent force-couple system, Therefore, loadings (c) and (h) are equivalent.
in System Equivalents: two force-couple systems that have the same net moment and net force on a body.
RA= -(300+200)
= -500N
MA=400N.M +200*3
MA=1000N.M
RA=200+300
=500N
MA= -400+300*3
=500N.M
RA= -(200+300)
= -500N
RA=500N
MA=400-500*3
= -11OON.M
(B) No '2' beams are equivalent
Your question is incomplete, Find the attachment 'missing part'
The explanation is in attachment on Explanation 1 &2 attachment
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A cube with 1 m on a side is located in the positive x-y-z octant in a Cartesian coordinate system, with one of its points located at the origin. Find the total charge contained in the cube if the charge is given by p_v = x^2 ye^-z mC/m^3
Answers
Answer:
4.61 mC
Explanation:
The cube has 1 m side in the positive x-y-z octant in a Cartesian coordinate system, with one of its points located at the origin. The charge density is given as:
\(\rho_v=x^2ye^{-z} \ mC/m^3\)
Charge density is the charge per unit length or area or volume. It is the amount of charge in a particular region.
The charge Q is given as:
\(Q=\int\limits_v {\rho_v} \, dv \\Q=\int\limits_v {\rho_v} \, dv=\int\limits^2_{x=0}\int\limits^2_{y=0}\int\limits^2_{z=0} {x^2ye^{-z}} \, dxdydz\\\)
\(Q=\int\limits^2_{x=0} {x^2} \, dx \int\limits^2_{y=0} {y} \, dy \int\limits^2_{z=0} {e^{-z}} \, dz \\\\Q=(\frac{1}{3} [x^3]^2_0)(\frac{1}{2} [y^2]^2_0)(-1 [e^{-z}]^2_0)\\\\Q=\frac{-1}{6} ([x^3]^2_0)( [y^2]^2_0)( [e^{-z}]^2_0)\\\\Q=\frac{-1}{6}[2^3-0^3][2^2-0^2][e^{-2}-e^0]\\\\Q=\frac{-1}{6}(8)(4)(0.1353-1)=\frac{-1}{6}(8)(4)(-0.8647)\\\\Q=4.61\ mC\)
(a) Calculate the heat flux through a sheet of steel that is 10 mm thick when the temperatures oneither side of the sheet are held constant at 300oC and 100oC, respectively.(b) Determine the heat loss per hour if the cross-sectional area of the sheet is 0.25 m2.(c) What will be the heat loss per hour if a sheet of soda-lime glass is used instead
Answers
Answer:
do the wam wam
Explanation:
The heat flux is =1038kW/m² , the heat lost per hour is =259.5 kW, the heat lost per hour using a sheet of soda- lime glass.
Calculation of heat fluxThe thickness of steel( t) = 10mm = 10× 10^-³m
The temperature difference on both sides = 300-100
∆T = 200°C
But the formula for heat flux = q = k∆T/t
Where K = thermal conductivity for steel = 51.9W/mK.
Substitute the variables into the formula for heat flux;
q = 51.9 × 200/10 × 10-³
q = 10380 × 10³/10
q = 10380000/10
q = 1038000 W/m² = 1038kW/m²
To calculate the heat lost per hour if the cross sectional area is = 0.25 m2 use the formula q × A
= 1038kW/m² × 0.25 m2
= 259.5 kW.
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The cars of a roller-coaster ride have a speed of 19.0 km/h as they pass over the top of the circular track. Neglect any friction and calculate their speed v when they reach the horizontal bottom position. At the top position, the radius of the circular path of their mass centers is 21 m, and all six cars have the same mass. What is v?
Answers
Complete Question
The cars of a roller-coaster ride have a speed of 19.0 km/h as they pass over the top of the circular track. Neglect any friction and calculate their speed v when they reach the horizontal bottom position. At the top position, the radius of the circular path of their mass centers is 21 m, and all six cars have the same mass.V = -18 m What is v?X km/h
Answer:
\(v=23.6m/s\)
Explanation:
Velocity \(v_c=18.0km/h\)
Radius \(r=21m\)
initial velocity u\(u=19=>5.27778\)
Generally the equation for Angle is mathematically given by
\(\theta=\frac{v_c}{2r}\)
\(\theta=\frac{18}{2*21}\)
\(\theta=0.45\)
\(\theta=25.7831 \textdegree\)
Generally
Height of mass
\(h=\frac{rsin\theta}{\theta}\)
\(h=\frac{21sin25.78}{0.45}\)
\(h=20.3m\)
Generally the equation for Work Energy is mathematically given by
\(0.5mv_0^2+mgh=0.5mv^2\)
Therefore
\(v=\sqrt{u^2+2gh}\)
\(v=\sqrt{=5.27778^2+2*9.81*20.3}\)
\(v=23.6m/s\)
When using an alternative method of sizing with two vent connectors for draft hood-equipped water heaters, the effective area of the common vent connector or vent manifold and all junction fittings shall not be less than the area of the larger vent connector plus _____ percent of the areas of smaller flue collar outlets
Answers
Answer:
Fifty (50) percent. [50%]
Explanation:
Water heater is a home appliance that comprises of an electric or gas heating unit as well as a water-tank where water is heated and stored for use.
When using an alternative method of sizing with two vent connectors for draft hood-equipped water heaters, the effective area of the common vent connector or vent manifold and all junction fittings shall not be less than the area of the larger vent connector plus fifty (50) percent of the areas of smaller flue collar outlets.
A water heater is primarily vented with an approved and standardized plastic or metallic pipe such as flue or chimney, which allows gas to flow out of the water heater into the surrounding environment.
For a draft hood-equipped water heater, both the water heater and the barometric draft regulators must be installed in the same room. Also, the technician should ensure that the vent is through a concealed space such as conduit and should be labeled as Type L or Type B.
The minimum capacity of a water heater should be calculated based on the number of bathrooms, bedrooms and its first hour rating.
Motion with Constant Acceleration. An antelope moving with constant acceleration covers the distance between two points 70.0 m apart in 7.00 s. Its speed as it passes the second point is 15.0 m/s. (a) What is its speed at the first point? (b) What is its acceleration? night of 10 m what is its initial speed as it
Answers
a. 25 b. accelerated by 7
Answer:
a. 25 b. accelerated by 7
phosphorus and nitrogen are included in which category of water pollutants?
Answers
Answer: Hello :)
They are in the nutrient pollution category.
Explanation:
determine the application of star connected network
Answers
Answer:
fijixuc uckyc7fmtjjr hcumffjmfumfnng
Answer:
a method of connecting polyphrase circuits in which one end of each phase line is connected to a common neutral point that may be connected to the earth as protection against lightning or to a wire to which all the other neutral points of the system are connected
Explanation:
A 40kg steel casting (Cp=0.5kJkg-1K-1) at a temperature of 4500C is quenched in 150kg of oil (Cp=2.5kJkg-1K-1) at 250C. If there are no heat losses, what is the change in entropy of?
(i) The casing.
(ii) The oil.
(iii) Both considered.
Answers
What is An ampere is
Answers
Answer:
the SI base unit of electrical current.
Answer:
An ampere is the SI base unit of electrical current
How many grams is one molecule of calcium oxide?
Answers
Answer:
Molar mass -56.0774 g/mol
There is a way to calculate this
atomic number for calcium is 20
atomic number for oxygen is 8
The molar mass for calcium is 40
The molar mass for oxygen is 16
CALCIUM OXIDE
40. +. 16
=56g/mol
1 molecule = 1×56=56g/mol
2 molecules=2×56 =112g/mol
me that both a triaxial shear test and a direct shear test were performed on a sample of dry sand. When the triaxial test is performed, the specimen was observed to fail when the major and minor principal stresses were 100 lb/in2 and 20 lb/in2, respectively. When the direct shear test is performed, what shear strength can be expected if the normal stress is 3000 lb/ft2
Answers
Answer:
shear strength = 2682.31 Ib/ft^2
Explanation:
major principal stress = 100 Ib / in2
minor principal stress = 20 Ib/in2
Normal stress = 3000 Ib/ft2
Determine the shear strength when direct shear test is performed
To resolve this we will apply the coulomb failure criteria relationship between major and minor principal stress a
for direct shear test
use Mohr Coulomb criteria relation between normal stress and shear stress
Shear strength when normal strength is 3000 Ib/ft = 2682.31 Ib/ft^2
attached below is the detailed solution
What relationship is there between the hydraulic system and power, force, energy, resources, and types of energy?
Answers
Answer:
Well to me there all energy resources.
Explanation:
Answer:
Hydropower is fueled by water, so it's a clean fuel source, meaning it won't pollute the air like power plants that burn fossil fuels, such as coal or natural gas. ... In addition to a sustainable fuel source, hydropower efforts produce a number of benefits, such as flood control, irrigation, and water supply.
Explanation:
A proposed piping and pumping system has 20-psig static pressure, and the piping discharges to atmosphere 160 ft above the pump. If the piping friction loss is 20 ft head, the minimum pressure rating (psi) of the piping system is most nearly:
(A) 50
(B) 100
(C) 150
(D) 250
Answers
Answer: (B) 100
Explanation:
Given that;
Pstatic = 20 psig , hz = 160ft, hf = 20ft
Now total head will be;
T.h = hz + hf
T.h= 160 + 20
T.h = 180ft
Minimum pressure = Psatic + egh
we know that specific weight of water is 62.4 (lb/ft3)
so
P.min = (20 bf/in² ) + (62.4 b/ft³ × 180 fr
P.min = (20 bf/in² ) + ( 62.4 × 180 × 1 ft²/144 in²)
P.min = 20 + 78
P.min = 98 lbf/in²
Therefore the minimum pressure rating (psi) of the piping system is most nearly B) 100
A container can be made from steel [β = 36 × 10-6 (C°)-1] or lead [β = 87 × 10-6 (C°)-1]. A liquid is poured into the container, filling it to the brim. The liquid is either water [β = 207 × 10-6 (C°)-1] or ethyl alcohol [β = 1120 × 10-6 (C°)-1]. When the full container is heated, some liquid spills out. To keep the overflow to a minimum, from what should the container be made and what should the liquid be
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Answer:
The container should be made of lead and the liquid should be water.
Explanation:
Since the volume of the container of liquid after expansion is V = V₀(1 + βΔθ) where V = initial volume, β = coefficient of volume expansion, Δθ = temperature change.
So, the volume change V₂ - V₁ where V₁ = volume of liquid and V₂ = volume of container
For steel, V₂ = V₀(1 + β₂Δθ) and V₁ = V₀(1 + β₁Δθ)
So, ΔV = V₀(1 + β₂Δθ) - V₀(1 + β₁Δθ) = V₀[1 + β₂Δθ - 1 - β₁Δθ] = V₀[β₂Δθ - β₁Δθ]
Since we want a minimum value for ΔV and V₀ and Δθ are the same, we need ΔV/V₀Δθ = β₂ - β₁ to be a minimum
where β₂ = coefficient of volume expansion of liquid and β₁ = coefficient of volume expansion of container.
So, trying each combination, with β₂ = 207 × 10⁻⁶ (C°)⁻¹] and β₁ = 36 × 10⁻⁶ (C°)⁻¹
β₂ - β₁ = 207 × 10⁻⁶ (C°)⁻¹ - 36 × 10⁻⁶ (C°)⁻¹ = 171 × 10⁻⁶ (C°)⁻¹
With β₂ = 207 × 10⁻⁶ (C°)⁻¹] and β₁ = 87 × 10⁻⁶ (C°)⁻¹
β₂ - β₁ = 207 × 10⁻⁶ (C°)⁻¹ - 87 × 10⁻⁶ (C°)⁻¹ = 120 × 10⁻⁶ (C°)⁻¹
With β₂ = 1120 × 10⁻⁶ (C°)⁻¹] and β₁ = 36 × 10⁻⁶ (C°)⁻¹
β₂ - β₁ = 1120 × 10⁻⁶ (C°)⁻¹ - 36 × 10⁻⁶ (C°)⁻¹ = 1084 × 10⁻⁶ (C°)⁻¹
With β₂ = 1120 × 10⁻⁶ (C°)⁻¹] and β₁ = 87 × 10⁻⁶ (C°)⁻¹
β₂ - β₁ = 207 × 10⁻⁶ (C°)⁻¹ - 87 × 10⁻⁶ (C°)⁻¹ = 1033 × 10⁻⁶ (C°)⁻¹
The combination that gives the lowest value for β₂ - β₁ is β₂ = 207 × 10⁻⁶ (C°)⁻¹] and β₁ = 87 × 10⁻⁶ (C°)⁻¹
Since β₁ = 87 × 10⁻⁶ (C°)⁻¹ = coefficient of expansion for lead β₂ = 207 × 10⁻⁶ (C°)⁻¹] = coefficient of expansion for water, the container should be made of lead and the liquid should be water.
The steel-frame structural support was a main feature in the development of __________. Group of answer choices
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The steel-frame structural support was a main feature in the development of t the floors, roof, walls and skyscraper.
What structure is aided by a metal frame?Steel frame is known to be a form of a building method that is used along with a skeleton frame that is made up of steel columns and I-beams.
Conclusively, This is often used in the construction of grid to aid the floors, roof and walls of any kind of building. It is also used in the construction of skyscraper.
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A closed vessel of volume 80 litres contains 0.5 N of gas at a pressure of 150 kN/m2. If the gas is compressed isothermally to half its volume, determine the resulting pressure.
Answers
Answer:
The resulting pressure of the gas when its volume decreases is 300 kN/m².
Explanation:
Given;
initial volume of the gas, V₁ = 80 L
number of moles of the gas, n = 0.5 moles
initial pressure of the gas, P₁ = 150 kN/m² = 150 kPa
Determine the constant temperature of the gas using ideal gas equation;
PV = nRT
where;
R is ideal gas constant = 8.315 L.kPa/K.mol
T is the constant temperature
\(T = \frac{P_1V_1}{nR} \\\\T = \frac{150.kPa \ \times \ 80 .L}{0.5 .mol \ \times \ 8.315(L.kPa/mol.K)} \\\\T = 2,886.35 \ K\)
When the gas is compressed to half of its volume;
new volume of the gas, V₂ = ¹/₂ V₁
= ¹/₂ x 80L = 40 L
The new pressure, P₂ is calculated as;
\(P_2V_2 = nRT\\\\P_2 = \frac{nRT}{V_2} \\\\P_2 = \frac{0.5 \times 8.315\times 2886.35}{40} \\\\P_2 = 300 \ kPa = 300 \ kN/m^2\)
Therefore, the resulting pressure of the gas when its volume decreases is 300 kN/m².
Crude oil at 20 c fills the space between two concentric cylinders 250 mm high and with diameters of 150 mm and 156 mm. Find the torque is required to rotate the inner cylinder at 12 r min, the outer cylinder rernaining stationary
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the torque is required to rotate the inner cylinder at 12 r min, the outer cylinder remaining stationary is 11.0807 N-m.
we have left out some other important details, such as the time required to reach that rpm, whether the beginning state is at rest, and the axis around which the cylinder is revolving. However, we'll suppose that it will be 60 seconds (time is necessary to convert rpm to angular acceleration)
rotation around the center axis
Angular acceleration = torque + MOI
Currently, angular acceleration equals 2 rpm/(t 60).
In order to avoid getting an extremely high figure, we estimated that the diameter of the cylinder was 600 mm rather than 600 meters: angular acceleration= 1.047 rad/s² MOI for cylinder across center dia= 1/4MR²+ 1/12ML²
MOI= 10.5833 kg-m
Now, the product of these two is torque.
11.0807 N-m of torque
Various MOI equations can be used to compute for different axes of rotation.
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The complete question is:
Crude oil at 20 c fills the space between two concentric cylinders 250 mm high and with diameters of 150 mm and 156 mm. Find the torque is required to rotate the inner cylinder at 12 r min, the outer cylinder remaining stationary.