The vessel now holds 4.05 liters of milk, after one-third of this diluted milk is given to three kittens
A stainless steel vessel holds 5.4 liters of milk. One-third of the milk is given to a cat. After some water is added to the milk that remains, its volume becomes 1.25 as much as it was before the water was added.
Before the water was added, the vessel held 5.4 liters of milk. After one-third (1.8 liters) was given to the cat, there was 3.6 liters of milk remaining in the vessel.
After adding water, the volume of the milk increased by a factor of 1.25, so the vessel now holds 4.5 liters (3.6 x 1.25) of diluted milk. Finally, one-third (1.5 liters) of this diluted milk is given to the three kittens, leaving 4.05 liters of milk in the vessel.
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Classify the variable as nominal-level, ordinal-level, interval-level, or ratio-level measurement. Number of gallons of water in a swimming pool
The number of gallons in a swimming pool in the given question can be classified as a ratio level measurement.
What is ratio level measurement?The highest of the four hierarchical levels of measurement is the ratio level measurement. Data recording accuracy is determined by the levels or scales of measurement. The measurement becomes more difficult as the level increases.
The features of the other 3 levels are all present in the ratio level. At the ratio level, values can take on a true zero, be categorised, ordered, have equal intervals, and more.
While interval and ratio variables are quantitative variables, nominal and ordinal variables fall under the category of categorical variables. Quantitative data allows for a much wider range of statistical tests than categorical data.
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An inverter or ac module is required to automatically ________ its output when utility power is lost.
An inverter or ac module is required to automatically switchover its output when utility power is lost.
What is an inverter?
An inverter is an electrical device that converts direct current (DC) to alternating current (AC). It is a type of power electronic converter that is used to convert low-voltage DC electricity from sources such as batteries or solar panels into a higher voltage AC output. Inverters allow for the use of DC power sources such as batteries to power AC appliances, and are commonly used in recreational vehicles and off-grid energy systems. They are also used in adjustable speed drives, uninterruptible power supplies, and in many consumer electronics applications. Inverters come in a variety of sizes ranging from small microcontrollers that control a single appliance, to large industrial models that are used to power entire buildings.
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The system ________ can communicate with each other and adjust system operation to match the heat load and operating conditions.
The system automatically can communicate with each other and adjust system operation to match the heat load and operating conditions.
What is system operation?
System operation is the process of managing, controlling, and monitoring the operations of a computer system or network. It encompasses the planning and implementation of system operations, including the coordination of hardware, software, and communication components. System operation includes activities such as system configuration, system monitoring, performance tuning, system backup, system recovery, and system maintenance. System operation ensures that the system or network is secure, reliable, and available to users. It also involves troubleshooting and responding to incidents, analyzing system performance, and identifying areas for improvement. System operation is critical to the success of any organization, as it ensures the availability, reliability, and security of the system or network.
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A(n) _________ is a set of permissions that is attached to an object.
a. access control list (ACL)
b. Subject Access Entity (SAE)
c. object modifier
d. security entry designator
A property's roof is twenty years old and has not been replaced. This condition would most likely be considered to be an example of
A property's roof is twenty years old and has not been replaced. This condition would most likely be considered to be an example of curable physical deterioration.
What is Curable physical deterioration?
Curable deterioration is a type of deterioration that can be cured economically. The economic feasibility of a property is indicated if the increase in value exceeds or is equal to the anticipated cost of repairing the property. The cost of replacing or restoring the item is used as a reasonable measure of curable deterioration.
Estimating the value of items that need to be repaired, such as window replacements, repainting, weatherstripping, roof repair, loose tile fixing, faulty wiring, and heating or cooling system repairs, is part of measuring curable deterioration.
Only include the items listed above if the increase in property value will cover the cost of repairs. For example, if roof repair and loose tile repair are estimated to cost $8,000, a prospective buyer can reduce their offer price by the same amount to cover the cost of doing such repairs.
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Find the time function corresponding to each of the following Laplace transforms using partial fraction expansions: (a) = F(s) = 1/s(s+1) (b) F(s) = 5/s(s+1)(s+5) (c) F(s) = 3s+2/s^2 + 2s + 10
The time function corresponding to each of the following Laplace transforms using partial fraction expansions will be:
(a) f(t) = e^(-t) + te^(-t)
(b) f(t) = 5e^(-t) + 5te^(-t) - 10e^(-5t)
(c) f(t) = 3e^(-t) + (2t+1)e^(-t) - 2e^(-2t) - 5te^(-2t)
What is fraction?
A fraction is a type of mathematical expression that represents a part of a whole. It is written as a ratio of two numbers, with a line separating them. For example, the fraction 1/2 represents one part of a whole that has been divided into two equal parts. Fractions are used to express amounts that are less than one, such as a half, a quarter, or a third. They can also be used to express amounts greater than one, such as two thirds, three quarters, or four fifths. Fractions are used in many different areas of mathematics, such as addition, subtraction, multiplication and division.
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Determine the required diameter of a steel transmission shaft 10 meters in length and material yield strength 350 MPa in order to resist a torque of up to 500 N.m. The shaft is supported by frictionless bearings at its ends. Design the shaft using the maximum shear stress theory, and selecting a factor of safety of 1.5. Neglect shaft weight.
Answer:
0.02795 m
Explanation:
Neglecting shaft weight Design the shaft using maximum shear stress theory and determine the required diameter
factor of safety = 1.5
length of shaft = 10 meters
material yield strength = 350 MPa
Torque = 500 N.m
The required shaft diameter = 0.02795 m
attached below is a detailed solution of the problem
The statements below refer to the design and operation of the power sub-system on a spacecraft. Select all those statements that are correct.
the battery and ODC input voltages, as well as the main parameters for the power source, fireworks, relays, anti-static resistances, etc. The statements below refer to the design and operation of the power sub-system on a spacecraft.
How do spaceship electric power systems work?Solar panels on these spacecraft convert solar energy into the electricity they require for propulsion. The electricity generated by the solar panels is used to recharge a battery within the spacecraft. These batteries can power the spaceship even as it is traveling away from the sun.
What make up a spacecraft's subsystems?The engine, temperature management, power and power distribution, attitude control, telemetry command and control, transmitters/antenna, computers/on-board processing/software, and structural components are only a few of the many subsystems that make up a spaceship bus.
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Gear B supplies 15 kW of power, while gears A, C and D withdraw 6 kW, 4 kW and 5 kW, respectively. If the shaft is made of steel with the allowable shear stress of tau_allow = 75 MPa, and the relative angle of twist between any two gears cannot exceed 0.05 rad. determine the required minimum diameter d of the shaft to the nearest millimeter. The shaft is rotating at 600 rpm.
Using the formula of shear stress, the minimum required diameter is 0.81mm
What is Shear StressShear stress is a force that causes two objects to slide past each other in opposite directions. It is the force per unit area of the surface on which the force is applied. Shear stress is often caused by two objects rubbing against each other, such as a car tire sliding on the road. It can also be caused by wind, gravity, or other forces.
The shear stress on the shaft can be calculated using the formula:
τ(allow) = P/(2*π*d*J)
where P is the total power transferred by the shaft, d is the diameter of the shaft, and J is the polar moment of inertia.
J = π*d⁴/32
Substituting the given values,
τ(allow) = (15 + 6 + 4 + 5)/(2*π*d*π*d⁴/32)
d = √[32*(15 + 6 + 4 + 5)/(τ(allow)*2*π²)]
d = √[32*(30)/(75*2*π²)]
d = 0.81mm
The minimum required diameter of the shaft is 0.81 mm to the nearest millimeter.
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Where is the airhorn of a 2014 kenworth t700?
the branch circuit conductors for a 5 hp, 230V, single-phase motor with a nameplate rating of 25 A must have an ampacity of ___________ or greater.
The branch circuit conductors for a 5 hp, 230V, single-phase motor with a nameplate rating of 25 A must have an ampacity of 30 A or greater.
What is circuit?
A circuit is an interconnection of electronic components that allows electricity, signals or data to flow from one component to another. It can be as simple as a single resistor or as complex as a microprocessor. Circuits are used to provide power to devices, control signals, process data or any combination of these. Circuits can be made from components such as resistors, capacitors, transistors, integrated circuits and microprocessors.
According to the National Electrical Code (NEC), the minimum branch circuit conductor size for a 5 hp, 230V, single-phase motor with a nameplate rating of 25 A must be sized at 30 A or greater. This is because the NEC requires a branch circuit conductor to have an ampacity at least 125% of the full-load current rating of the motor.
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Why is it critical for the upper and lower end sections of an engine to work perfectly together
Answer:
It is critical for the upper and lower end sections of an engine to work perfectly together because they are responsible for converting fuel into motion, which is necessary for the engine to operate effectively.
The upper end section of an engine includes the cylinder head and valves, which are responsible for controlling the flow of fuel and air into the engine. The lower end section of an engine includes the crankshaft, connecting rod, and pistons, which are responsible for converting the fuel's energy into rotational motion.
If the upper and lower end sections of an engine are not working perfectly together, it can lead to a variety of problems, including reduced engine performance, reduced fuel efficiency, and increased emissions. It is therefore critical for the upper and lower end sections to be carefully designed and calibrated to work together seamlessly in order to ensure the optimal performance of the engine.
What is the difference between contact relay and communication relay
Answer: The main difference between contact relays and communication relays is the type of signals that they are designed to handle, with contact relays being used to control the flow of electricity in a circuit and communication relays being used to transmit data or signals from one location to another.
Explanation: The main difference between contact relays and communication relays is the type of signals that they are designed to handle. Contact relays are used to control the flow of electricity in a circuit by opening and closing electrical contacts, while communication relays are used to transmit data or signals from one location to another.Contact relays are typically used in applications where it is necessary to switch electrical circuits on and off, such as in control panels and automated systems. They are usually designed to handle relatively low-frequency electrical signals and are typically not suitable for transmitting data or high-frequency signals.On the other hand, communication relays are used to transmit data or signals from one location to another, and are typically designed to handle a wide range of frequencies and data types. They can be used to transmit voice, data, and video signals over a variety of mediums, including wire, fiber optic cables, and wireless transmission.
A flow i decribed by velocity field V=ayibxj where a = 2 (m/) and b = 1 (1/) , coordinate are meaured in meter. A) Obtain the equation for the treamline paing through the point (2,5). B) At t=2 , what are the coordinate of the particle that paed through point (0,4) at t=0. C) At t=3 , what are the coordinate of the particle that paed through point (1,4. 25) 2 econd earlier
The equation for the streamline passing through point (2,5) is y-5=b/a(x-2).
What is streamline?Streamlining is a process of simplifying or improving a process or system to increase efficiency, reduce complexity, and reduce costs. It can involve reorganizing, restructuring, rearranging, or redefining a system, procedure, or process to make it more efficient and productive.
B) At t=2, the coordinate of the particle that passed through point (0,4) at t=0 is (6,7). This is because since the velocity field is V = ayibxj, the particle will experience a displacement of 2a in the x-direction and 2b in the y-direction in the span of 2 seconds. Thus, the displacement of the particle is (2a,2b) = (4,2). Adding this to the initial position (0,4), the new position of the particle is (4,6).
C) At t=3, the coordinate of the particle that passed through point (1,4.25) 2 seconds earlier is (7.25,6.25). This is because since the velocity field is V = ayibxj, the particle will experience a displacement of 3a in the x-direction and 3b in the y-direction in the span of 3 seconds. Thus, the displacement of the particle is (3a, 3b) = (6,3). Adding this to the initial position (1,4.25), the new position of the particle is (7,7.25).
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So i have a Question so if you have somebody in your family and you dont share nothing with that person what do that person feel like so if they dont do nothing how would you feel.
Answer:
Who care
Explanation:
Lol
What is the difference between cinema and theatre ?? I want the difference
Answer:
The main difference between theatre and cinema is that theatre involves live performances like plays, opera, ballet, and musical theatre, while cinema involves films.
Theatre is a building or outdoor area that houses dramatic presentations, and stage entertainments. In British English, cinema refers to a building that contains an auditorium for viewing films – this is equivalent for movie theatre in American English.
Explanation:
Similarities between theatre and movies
Both movies and theatre focus on social evils and problems and represent them to society through play and cinema. In both, the purpose of the cases is to bring positive changes in society. ...
Both theater plays and movies are forms of entertainment that allow an audience to enter different worlds. ...
Both theater plays and movies are forms of entertainment
Answer:
Theatre typically involves live performances, while cinema usually contains a moving picture that is prerecorded or premade and being projected.
Examples of theatre include:
BalletsPlaysMusicalsExamples of cinema include:
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increasing capacity just before a bottleneck operation will improve the output of the process.
a. true
b. false
Answer: true
Explanation: I haves
Exactly 5. 00 mL aliquots of a solution containing Phenobarbital were measured into 50. 00ml volumetric flasks and made basic with KOH.
The following volumes of a standard solution of Phenobarbital containing 2. 00 µg/ml of Phenobarbital were then introduced into each flask and the mixture was diluted to volume: 0. 00, 0. 500,1. 000, 1. 50, and 2. 00ml.
The fluorescence of each of these solutions was measured with a fluorometer, which gave volumes of 3. 26, 4. 80, 6. 41, 8. 02, and 9. 56 respectively.
(a) Pot the data.
(b) Using the plot from (a) calculate the concentration of Phenobarbital in the unknown.
(c) Derive a least-squares equation for the data.
(d) Find the concentration of Phenobarbital from the equation in (c)
(e) Calculate a standard deviation for the concentration obtained in (d)
The data can be plotted as a standard curve. The concentration of Phenobarbital in the unknown can be determined by finding the point on the curve where the fluorescence of the solution intersects the x-axis.
Pot the dataa) The data is plotted in form of a standard curve, which is a graph of the fluorescence of the solutions versus the volume of the standard solution added.
Using the plot from (a) calculate the concentration of Phenobarbital in the unknown.b) By drawing a line of best fit through the data points, we can find the point where the line intersects the x-axis, the x-intercept, which will give us the concentration of phenobarbital in the unknown.
Derive a least-squares equation for the data.c) The least-squares equation is a mathematical representation of the line of best fit. It is used to find the relationship between two variables by minimizing the sum of the squared residuals between the data points and the line.
Find the concentration of Phenobarbital from the equation in (c)d) Using the equation obtained in c), we can calculate the concentration of phenobarbital in the unknown.
Calculate a standard deviation for the concentration obtained in (d)e) By using the residuals of the line of best fit, we can calculate the standard deviation of the concentration obtained in d). This will give us an idea of how much the concentration of phenobarbital in the unknown deviates from the actual value.
The least-squares equation can be found by fitting a line to the data points. The concentration of Phenobarbital can then be determined using this equation. The standard deviation for the concentration can be calculated using the residuals from the line of best fit.
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A rigid pavement on a new interstate with 3 lanes in each direction has been conservatively designed with a 12-inch slab, an Ec of 5.5 million psi, a concrete modulus of rupture of 700 psi, a load transfer coefficient of 3.0, an initial PSI of 4.5, and a TSI of 2.5. The overall standard deviation is 0.35, the modulus of subgrade reaction is 290 lb/in3, and the drainage coefficient is 0.9. The pavement was designed for 600 30-kip tandem axles per day and 1400 20-kip single axle loads per day total for all 3 lanes. If the desired reliability is 90%, how long will the pavement last in years
The pavement will last between 41 and 50 years with a reliability of 90%.
A road surface, also known as pavement, is a durable surface material that is laid down on an area intended to support vehicular or pedestrian traffic, such as a road or walkway.
First, calculate the number of equivalent single axle loads (ESALS):
ESALS = 600*30 + 1400*20 = 55600.
Next, calculate the design life (L) using the formula: L =
(ESALS/18000)^(1/TSI) * (Ec/PSI)^(-1/2*SD).
Plugging in the values,
L = (55600/18000)^(1/2.5) * (5.5 x 10^6/4.5)^(-1/0.7) = 41.8.
Lastly, calculate the reliability (R) using the formula:
R = (1-LT^(-1/2))*100.
Calculating for a pavement life of 41 years and 50 years gives a reliability of 90% for both values.
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Can space debris take out a whole state
12. Which of the following letter doesn't still the same when its viewed
in a mirror?
Α. Ε
B. W
C.S.
D. B
Answer:
the correct answer is option B. W
Answer:
it is b and w
Explanation:
pls mark as brainlist
Consider the velocity field v={−4yti+2xtj}m/s for the following parts
The velocity field isn't conservative, though.
What exactly is Velocity ?
Velocity is the direction at which an item is moving and serves as a measure of the rate at which its location is changing as seen from a particular point of view and as measured by a specific unit of time (for example, 60 km/h northbound). In kinematics, the area of classical physics that deals with the motion of bodies, speed is a basic idea.
A physical scalar quantity called velocity must have both a magnitude and a direction in order to be characterized. Speed is the scalar absolute value (intensity) of velocity; it is a coherent basic determinant whose quantity is measured in metres per second (m/s or m/s1) in the SI (measurement units).
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What is the 8-digit binary value of the last octet of the IPv4 address 172.17.10.7? O 00000111 O 01100110 O 00001111 O 00000110 Question 10 1 pts A site administrator has been told that a particular network at the site must accommodate 126 hosts. Which subnet mask would be used that contains the required number of host bits? 255.255.255.128 255.255.255.0 O 255.255.255.224 O 255.255.255.240 Question 11 1 pts In which alternative to DHCPv6 does a router dynamically provide IPv6 configuration information to hosts? O SLAAC O ARP O ICMPv6 O EU1-64
The router will be informed of the appropriate host ID by the last octet, which is the octet of the sub-net mask 255.255.255.0.
In the IPv4 component of the address, one octet is referred to as x and is a decimal value between 0 and 255. Periods are used to separate the octets. Three periods and four octets are required in the IPv4 component of the address. People may have also heard the term "octets" used to describe the four numbers that make up an IP address. The right name for the four distinct digits that make up an IP address is an octet. The third octet of sub-netting is used to specify specific sub nets of network 150.150.0.0. In the example in the image, each sub-net number has a different value in the third byte, signifying that it is a separate sub-net number.
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A portable x-ray unit has a transformer, the 120V input of which is transformed to the 100kV output needed by the x-ray tube. The primary has 50 loops and draws a current of 10A when in use. What is ratio of the number of loops in the secondary to the number of loops in the primary
2500 : 3
Explanation:
To solve this, let's build some relationships among the power, voltage, current and number of loops in an ideal transformer.
For an ideal transformer, the powers generated by the primary and secondary coils are the same. In other words, the input power and output power remain the same.
Input power = Output power
Where;
Input power = [tex]V_{p}[/tex] x [tex]I_p[/tex]
Output power = [tex]V_{s}[/tex] x [tex]I_s[/tex]
=> [tex]V_{p}[/tex] x [tex]I_p[/tex] = [tex]V_{s}[/tex] x [tex]I_s[/tex]
This can be re-written as:
[tex]\frac{V_p}{V_s}[/tex] = [tex]\frac{I_s}{I_p}[/tex] ------------------(i)
Also, the transformer turns ratio (r) is the quotient of the number of turns/loops in the primary coil and the number of turns/loops in the secondary coil. i.e
r = [tex]\frac{N_p}{N_s}[/tex]
This ratio is equal to the ratio given in equation (i) i.e
r = [tex]\frac{N_p}{N_s}[/tex] = [tex]\frac{V_p}{V_s}[/tex] = [tex]\frac{I_s}{I_p}[/tex]
=> r = [tex]\frac{N_p}{N_s}[/tex] = [tex]\frac{V_p}{V_s}[/tex]
=> [tex]\frac{N_p}{N_s}[/tex] = [tex]\frac{V_p}{V_s}[/tex]
This can be re-written as
=> [tex]\frac{N_s}{N_p}[/tex] = [tex]\frac{V_s}{V_p}[/tex] -----------(ii)
From the question,
[tex]V_{p}[/tex] = 120V
[tex]V_{s}[/tex] = 100kV = 100000V
Substitute these values into equation (ii) as follows;
[tex]\frac{N_s}{N_p}[/tex] = [tex]\frac{100000}{120}[/tex]
[tex]\frac{N_s}{N_p}[/tex] = [tex]\frac{10000}{12}[/tex]
[tex]\frac{N_s}{N_p}[/tex] = [tex]\frac{2500}{3}[/tex]
Therefore, the ratio of the number of loops in the secondary to the number of loops in the primary is 2500 : 3
Tactical ventilation should only be performed when the fire attack hoselines and teams are in place and ready to advance toward the fire. T/F
It is TRUE that the Tactical ventilation should be performed only when the fire attack hoselines and teams are ready to advance toward the fire.
What is Tactical ventilation?
Through purposeful flow path management, the overarching goal of all forms of tactical ventilation is to improve interior tenability for occupants and firefighters.
Flow path management for control and extinguishment is best accomplished by placing ventilation openings as close to the source fire as possible (e.g., not in a remote location) and working in collaboration with the fire attack team (e.g., vent ahead of rather than behind the attack team).
Firefighters must constantly control their environment with hose stream techniques when using ventilation tactics and interior attack to cool and dilute the highly combustible smoke.
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Question 4: Princeton has a longstanding commitment to service and civic engagement. Tell us how your story intersects (or will intersect) with these ideals.
Princeton has a long tradition of service and civic engagement, and I am proud to be part of this legacy.
I have always been passionate about giving back to my community and helping those in need. I have participated in volunteer programs to help feed the homeless, tutor disadvantaged children, and provide other forms of community service.
I am also committed to making a positive impact on the environment by taking part in various initiatives to reduce my carbon footprint. I am currently a member of the Princeton Environmental Action Group and will be taking part in their upcoming campaigns to reduce waste and promote sustainable practices on campus.
I am also part of the Princeton Student Climate Initiative, which is dedicated to raising awareness about climate change and advocating for policy changes that will help protect the environment. I look forward to continuing my commitment to service and civic engagement during my time at Princeton, and I know that by working together, we can make a positive difference in our community.
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How are laws and regulations different from one another? A, Laws are long-standing, while regulations can be modified quickly Laws are long-standing, while regulations can be modified quickly B, Laws can be modified quickly, while regulations are long-standing Laws can be modified quickly, while regulations are long-standing C, Laws are governed by the federal government while regulations are governed by the state government Laws are governed by the federal government while regulations are governed by the state government D, Violators of laws are taken to criminal court while violators of regulations are taken to civil court. Violators of laws are taken to criminal court while violators of regulations are taken to civil court.
Answer:
Terms in this set (18)
Original
Which agency is responsible for managing Florida's hunting laws and regulations?
*The Fish & Wildlife Conservation Commission
*The US Fish & Wildlife Service
*The International Hunter Education Association
*The National Rifle Association
The Fish & Wildlife Conservation Commission
How are laws and regulations different from one another?
*Laws are long-standing, while regulations can be modified quickly
*Laws can be modified quickly, while regulations are long-standing
*Laws are governed by the federal government while regulations are governed by the state government
*Violators of laws are taken to criminal court while violators of regulations are taken to civil court.
Laws are long-standing, while regulations can be modified quickly
Why were hunting laws and regulations initially enacted?
*To help market hunters get enough game to survive
*To protect wildlife from over hunting and market hunting
*To help hunters get a fair price for food from wild game
*To protect wildlife from fair chase and conservation efforts
To protect wildlife from over hunting and market huntingExplanation:
What is a transition? A. An animation that happens on a single slide B. An outline format that uses roman numerals C. An image file imported to a title slide D. An effect that happens between slides Please select the best answer from the choices provided A B C D
Answer:
its c
Explanation:
The motor feeder conductor size for a quantity of (three) 15 hp, 208V, three-phase motors and a quantity of (three) 3 hp, 208V, single-phase and a quantity of (three) 1 hp, 120v, single phase motors will be __________________. Assume all terminations are rated at 75 degrees C and aluminum THHN conductors will be used.
The motor feeder conductor size for the described system would be 4 AWG aluminum THHN rated for a 75-degree C temperature.
The total horsepower for the three-phase motors is 45 hp and the total horsepower for the single-phase motors is 4 hp. The total horsepower is then 49 hp.
The next step is to calculate the load in amps as follows:
(49 hp x 746 watts)/(208 volts x 1.25 efficiency factor)
= 177 amps.
With 177 amps as the total load, the next step is to select the conductor size using the NEC Table 310.16. A 4 AWG aluminum THHN conductor is rated for a maximum of 195 amps.
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A force F having a magnitude of F = 165 N acts along the diagonal of the parallelepiped. Determine the moment of F about point A, using MA =rB x F and MA =rC x F.
Therefore, (-26.46i-52.92k) Nm is the answer to the presented problem of force.
What is a force, exactly?The definition of force in physics is: The push or pull on a massed object changes its velocity. An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.
Which four primary forces are there?Any of the four fundamental forces in physics—gravitational, electromagnetic, strong, and weak—that control how things or particles interact as well as how some particles decay—is referred to as a fundamental force, also known as a fundamental interaction. These fundamental forces are the source of all known natural forces.
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