In a proposed design for an electric automobile, the shaft of a four-pole three-phase induction motor is connected directly to the drive axle; in other words, there is no gear train. The outside diameter of the tires is 20 inches. Instead of a transmission, an electronic converter produces variable-frequency three-phase ac from a 48-V battery. Assuming negligible slip, find the range of frequencies needed for speeds ranging from 5 to
70mph
. The vehicle, including batteries and occupants, has a mass of
1000 kg
. The power efficiency of the dc-to-ac converter is 85 percent, and the power efficiency of the motor is 89 percent. a. Find the current taken from the battery as a function of time while accelerating from 0 to 40 mph uniformly (i.e., acceleration is constant) in 10 seconds. Neglect wind load and road friction. b. Repeat assuming that the vehicle is accelerated with constant power.
Answers
The current taken from the battery as a function of time while accelerating from 0 to 40 mph uniformly (i.e., acceleration is constant) in 10 seconds is; 88t A
How to find the current in the car battery?From the problem description, we are given;
Outside diameter of tire; d_t =20 inches,
Thus; radius; r_t = 10 inches,
DC Voltage; V_DC−in = 48 V
Initial velocity; v₁ = 5 mph
Final velocity; v₂ = 70 mph
Power efficiency of converter; η_dc = 85%
Power efficiency of motor; η_m = 89%
mass; m = 1000 kg
Now, we want to find the current taken from the battery as a function of time while accelerating from 0 to 40 mph uniformly (i.e., acceleration is constant) in 10 seconds.
The considered speeds will be;
Initial speed; v₁ = 0 mph = 0 m/s
Final speed; v₂ = 40 mph = 17.88 m/s
Thus;
Acceleration is gotten from the formula;
a = (v₂ - v₁)/t
a = (17.88 - 0)/10
a = 1.788 m/s²
The force that the motor has to develop for the given acceleration is;
F = ma
F = 1000 * 1.788
F = 1788 N
The output power would be generated from the formula;
P_out = F * a * t
P_out = 1788 * 1.788
P_out = 3196.944t W
The formula for the power input is;
P_in = P_out/(η_dc * η_m)
P_in = 3196.944t/(0.85 * 0.89)
P_in = 4226t W
Formula for the current taken from the battery is;
I_dc_in = P_in/(V_dc_in)
Thus;
I_dc_in = 4226t/48
I_dc_in = 88t A
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Related Questions
how to fill osprey hydraulics lt
Answers
To refill the reservoir:
Disengage the Slide-Seal™ mechanism and unfurl the PourShield™, allowing it to fulfill its purpose.Gently compress the PourShield™ with one hand, generating a broad aperture, while maintaining stability by grasping the carry handle with your other hand.Reinstate the Slide-Seal™ to its rightful position and invert the reservoir, diligently inspecting for any insidious leaks. Moreover, expel surplus air to curtail superfluous agitation within the reservoir.What are hydraulics?Hydraulics, a mechanical function that operates through liquid pressure. Within the realm of hydraulics-driven systems, the captivating dance of mechanical motion unfolds, intricately woven by the sheer might of encapsulated, propelled fluid.
It is this symphony of forces that breathes vitality into machinery, propelling the very essence of motion through the graceful interplay of hydraulic cylinders, orchestrating the eloquent journey of pistons.
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Argue why electrode therapy is NOT the most effective treatment for brain disorders, and recommend an alternative treatment.
Answers
Answer:
Due to risk of damaging of brain.
Explanation:
The electrode therapy is not the most effective treatment for brain disorders because there are various other treatments which can treat the brain disorder without causing damage to the brain. electrode therapy greatly damaged the brain instead of treatment of brain disorder. Medication is the best way to treat brain disorder so that's why electrode therapy is not considered as the most effective treatment for brain disorders, and the doctors recommend an alternative treatment.
A ball bearing has been selected with the bore size specified in the catalog as 35.000 mm to 35.020 mm. Specify appropriate minimum and maximum shaft diameters to provide a locational interference fit.
Answers
Answer:
A ball bearing has been selected with the bore size specified in the catalog as 35.000 mm to 35.020 mm. Specify.... ... has been selected with the bore size specified in the catalog as 35.000 mm to 35.020 mm. Specify appropriate minimum and maximum shaft diameters to provide a locational interference fit.
Explanation:
A single direct acting controller used to control space temperature and set up for 72°F setpoint with an 8°F throttling range assigned. The system pressure range is from 3 to 13 psig. Predict the following: (a) Controller PB setting when remote sensors with spans of 50°F, 150°F, and 200°F are used. (b) Controller pressure range. (c) Controller setpoint. (d) Controller output pressure at T = 72°F using the same sensors as in (a). (e) Controller output pressure at T = 76°F. (f) Predict the output pressure of the controller at T = 80°F when th
Answers
The controller PB is 0.22, the range of the controller pressure is between 3 to 13 psig, the controller setpoint is at 72°F, and the output pressure at that temperature is 3 psig while the controller output pressure at 76°F is 6 psig
What is Controller SystemsA controller system is a type of feedback system used to regulate the performance of an output device by comparing the output to a desired set point. It uses the difference between the two values (error) to continuously adjust a control input to reduce the error. In simple terms, the controller system monitors, adjusts, and regulates the operations of the output device to achieve a desired result. Common examples of controllers include thermostats, cruise control systems, and PID controllers.
(a) Controller PB setting when remote sensors with spans of 50°F, 150°F, and 200°F are used:
This can be calculated as;
PB = (72°F - 50°F) / (200°F - 50°F) = 0.22
(b) Controller pressure range:
The range of the controller pressure is 3 - 13 psig
(c) Controller setpoint:
The controller set point is 72°F
(d)
The controller output pressure when T = 72°F while using the same sensors as in (a) is 3 psig
(e)
The controller output pressure at T = 76°F is 6.6 psig
(f) To predict the output pressure of the controller when T = 80°F with three remote sensors having spans of 50°F, 150°F, and 200°F are used will be 11.2 psig
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A frequenter of a pub had observed that the new barman poured in average 0.47 liters of beer into the glass with a standard deviation equal to 0.09 liters instead of a half a liter with the same standard deviation. The frequenter had used a random sample of 47 glasses of beer in his experiment. Consider the one-sided hypothesis test for volume of beer in a glass: H0: u=0.5 against H1: u<0.5. Determine the P-value of this test.
Round your answer to four decimal places (e.g. 98.7654).
Answers
Answer:
P-value = 0.0011
Explanation:
Formula for the test statistic is;
z = (x¯ - μ)/(σ/√n)
We have;
Sample mean;x¯ = 0.47
Population mean; μ = 0.5
Standard deviation; σ = 0.09
Sample size; n = 47
Thus;
z = (0.46 - 0.5)/(0.09/√47)
z = -3.05
From z-distribution table attached, the p-value corresponding to z = -3.05 is;
P = 0.00114
To four decimal places gives;
P-value = 0.0011
what is the radial load in bearing b when the motor is stopped with zero tension in the chain? ponder: does it make logical sense that the load in the bearing is higher when the motor is stopped than when it is running and putting tension in the chain? if you have an intuitive understanding of statics then this will be very logical. (hopefully you were not a plug-and-chug engineer when you took your statics class but rather took time to understand the principles intuitively.) incorrect answer: 200
Answers
The radial load in bearing b when the motor is stopped with zero tension in the chain is 300 lb. It is logical that the load in the bearing is higher when the motor is stopped than when it is running and putting tension in the chain due to the principle of statics.
Here's why:When the motor is running, the chain is stretched due to the tension force applied to it. This tension force counteracts the radial load on the bearings, which is why the load is lower in this scenario.On the other hand, when the motor is stopped with zero tension in the chain, the weight of the load is entirely supported by the bearings.
The radial load on the bearing is given by the formula:Radial load on bearing = (Weight of load / Number of bearings) + Axial load due to belt tensionTherefore, when the motor is stopped with zero tension in the chain, the radial load on bearing b can be calculated as follows:Radial load on bearing b = (300 lb / 2) + 0Radial load on bearing b = 150 lbHence, the radial load in bearing b when the motor is stopped with zero tension in the chain is 150 lb.
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true or false? in requirement-based security, we identify and prioritize our security needs in a risk assessment process.
Answers
True. Requirement-based security is a process where we identify and prioritize our security needs based on a thorough risk assessment. This process helps us determine the security requirements for our systems, applications, and data by assessing potential threats and vulnerabilities.
The risk assessment process involves identifying the assets that need protection, assessing the risks to these assets, and determining the likelihood of those risks occurring. Once we have identified the risks, we can then prioritize the security requirements and allocate resources accordingly.
Requirement-based security is a proactive approach to security that ensures that security measures are aligned with the specific needs of the organization. This approach ensures that security measures are not only effective but also cost-efficient, and that they can adapt to changing circumstances.
In conclusion, requirement-based security is an essential process for any organization that aims to protect its assets from potential threats. By identifying and prioritizing security needs through a risk assessment process, organizations can ensure that their security measures are effective, efficient, and adaptable.
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what are material engineers trying to discover when they study different materials
Answers
Answer:
The Material engineers trying to discover when they study different materials is described below in complete detail.
Explanation:
Material engineers analyze various elements to discover the purpose and explanation of its existence, the chemical characteristics, how long it has stood there, and how it influences human life. The material engineer is an engineering exercise that concentrates to enhance human activity by investigating the environment and the diverse elements or elements it holds.
Is the MI-24 Hind the most widely exported combat helicopter in the world?
Answers
What term describes a catalytic converter as it reaches its effective temperature?
Answers
In this activity, you will conduct research on a famous work of architecture from the 1800s and write a report about the work and the architect who created it. You will then create an architectural drawing.
__________________________________________________________________________
Directions and Analysis
Task 1: Researching an Architectural Work of the 1800s
Use the Internet and other available resources to conduct basic research on architecture from the 1800s. Select a building designed by a significant (influential) architect from that period, and then write a paper about the building and architect. Make sure you include the following:
About the architect
basic biographical information
education
how the architect influenced society and design
About the building/work
main materials used
structural considerations
technology and tools used during construction
Answers
Answer:
can you explain how to do this
Explanation:
Which is currently the most supported theory about the future of the universe?
a.The universe could remain exactly as it is today.
b.The universe may continue to expand.
c.Stars could burn out, causing the universe to become dark and cold.
d.Gravity could pull galaxies back together, causing a reverse of the big bang.
Answers
Answer:
b. The universe may continue to expand.
Explanation:
The most supported theory about the future of the universe is that, it may continue to expand up to such point that it will become too cold to allow any forms of life to pull through. This is popularly known as the "Big Freeze."
Such acceleration of expansion is caused by the so-called, "dark energy." This also explains why the acceleration of expansion is not constant. This thereby causes the distance between galaxies to grow farther apart.
Answer:
b
Explanation:
edge 2021
pick the statement that is false group of answer choices phpmyadmin is the command line interface (cli) to mysql phpmyadmin generates sql statements for you, based on clicking on various menus phpmyadmin requires authentication to allow access to mysql phpmyadmin can be run on a different machine than the database server
Answers
Depending on selecting different choices For phpmyadmin to grant access to mysql, authentication is necessary. False: The statement that phpmyadmin can execute on a system other than the database server
phpMyAdmin is a MySQL and MariaDB administration tool that is free and open source. As a portable web application primarily built in PHP, it has grown to become one of the most well-liked MySQL administration tools, especially for web hosting providers. Tobias Ratschiller, at the time an IT consultant and later the founder of the software company Maguma, started working on a PHP-based online front-end for MySQL in 1998 after getting intrigued by MySQL-Webadmin. He abandoned the project (together with phpAdsNew, which he was also the original author of) in 2000 due to a lack of time. By that time, phpMyAdmin had already made a name for itself as one of the most popular PHP applications and MySQL administration tools, with a substantial user and contributor base.
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A horizontal force P is applied to a 130 kN box resting on a 33 incline. The line of action of P passes through the center of gravity of the box. The box is 5m wide x 5m tall, and the coefficient of static friction between the box and the surface is u=0.15. Determine the smallest magnitude of the force P that will cause the box to slip or tip first. Specify what will happen first, slipping or tipping.
Answers
Answer:
SECTION LEARNING OBJECTIVES
By the end of this section, you will be able to do the following:
Distinguish between static friction and kinetic friction
Solve problems involving inclined planes
Section Key Terms
kinetic friction static friction
Static Friction and Kinetic Friction
Recall from the previous chapter that friction is a force that opposes motion, and is around us all the time. Friction allows us to move, which you have discovered if you have ever tried to walk on ice.
There are different types of friction—kinetic and static. Kinetic friction acts on an object in motion, while static friction acts on an object or system at rest. The maximum static friction is usually greater than the kinetic friction between the objects.
Imagine, for example, trying to slide a heavy crate across a concrete floor. You may push harder and harder on the crate and not move it at all. This means that the static friction responds to what you do—it increases to be equal to and in the opposite direction of your push. But if you finally push hard enough, the crate seems to slip suddenly and starts to move. Once in motion, it is easier to keep it in motion than it was to get it started because the kinetic friction force is less than the static friction force. If you were to add mass to the crate, (for example, by placing a box on top of it) you would need to push even harder to get it started and also to keep it moving. If, on the other hand, you oiled the concrete you would find it easier to get the crate started and keep it going.
Figure 5.33 shows how friction occurs at the interface between two objects. Magnifying these surfaces shows that they are rough on the microscopic level. So when you push to get an object moving (in this case, a crate), you must raise the object until it can skip along with just the tips of the surface hitting, break off the points, or do both. The harder the surfaces are pushed together (such as if another box is placed on the crate), the more force is needed to move them.
As the rotor moves through its various positions, _______
Answers
As the rotor of a machine or device moves through its various positions, different physical or electrical phenomena may occur depending on the specific design and function of the machine.
Some possible phenomena that may occur include:
Changes in magnetic flux: If the rotor has magnets or magnetic fields, the movement of the rotor can cause changes in the magnetic field strength or orientation. This can induce electrical currents in nearby conductors, or cause mechanical forces to act on other components in the machine.Variation in torque: Depending on the design of the machine, the movement of the rotor can cause changes in the torque or rotational speed of the machine. For example, in an electric motor, the position of the rotor relative to the stator can affect the amount of electromagnetic force produced, which can in turn affect the motor's torque output.Alteration of fluid flow: In some machines, such as turbines or pumps, the rotation of the rotor can cause changes in fluid flow patterns or pressures. This can affect the efficiency or performance of the machine, or cause mechanical stresses on the components.Overall, the specific effects of the rotor's movement will depend on the design and function of the machine and may be carefully controlled or optimized to achieve specific performance goals.
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According to Ref. 213/91, fire extinguishing equipment can be frozen True or False
Answers
False. Fire extinguishing equipment cannot be frozen according to Ref. 213/91.
According to Ref. 213/91, fire extinguishing equipment cannot be frozen. Fire extinguishers are essential safety devices designed to combat fires effectively. They contain pressurized agents that are specifically formulated to extinguish different types of fires. Freezing temperatures can significantly impair the functionality of fire extinguishers and render them ineffective in emergency situations.
When fire extinguishing equipment freezes, several issues can arise. First, the contents of the extinguisher may expand as they freeze, potentially leading to ruptures or leaks in the container. This can cause the extinguisher to malfunction or become hazardous when used. Second, freezing temperatures can affect the performance of the extinguishing agent itself. Certain agents, such as water-based solutions, can solidify or lose their effectiveness when exposed to extreme cold.
It is crucial to store fire extinguishers in suitable environments that are above freezing temperatures. This ensures that the equipment remains in optimal condition and is ready for immediate use during emergencies. Regular inspections and maintenance are also essential to identify any signs of damage or deterioration that may compromise the functionality of fire extinguishers.
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a landowner’s promise to pay a contractor a bonus to complete construction of a building according to the terms of a pre-existing contract between the landowner and the contractor is:
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A landowner's promise to pay a contractor a bonus to complete construction of a building according to the terms of a pre-existing contract between them is a legally enforceable agreement that can be considered an addendum or modification to the original contract.
In this scenario, the landowner and the contractor have already established a pre-existing contract for the construction of a building. The landowner's promise to pay a bonus to the contractor acts as an additional agreement or modification to the original contract. While the original contract sets out the terms and conditions of the construction project, the bonus serves as an extra incentive for the contractor to complete the work according to specific requirements or within certain deadlines.
The promise of a bonus can be legally enforceable if it meets the requirements for a valid contract, such as offer, acceptance, consideration, and intention to create legal relations. To ensure enforceability, it is advisable to have the promise in writing, clearly outlining the conditions under which the bonus will be paid. This may include milestones, quality standards, or timely completion of the project. If the contractor fulfills the specified requirements, the landowner is obligated to pay the promised bonus as part of their agreement, reinforcing the contractor's motivation to meet or exceed expectations.
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1. When jump starting a car, make sure it is in __________.
Answers
Answer:
Make sure both cars are in park or neutral with the parking brake engaged. This makes sure that all electrical functions (headlights, radios, etc.) are turned off.
When jump starting a car, make sure it is in the right distance of the cables to reach battery.
What is jump starting a car?Jump starting a car is commonly done from another car, and also it can be done from a jump battery. If we have to jump start a car in a safe way, the following steps are more necessary,Take out your jumper cables.Before the cable was taking, Make sure cars are in the right distance to have the jumper cables reach each battery.Place both vehicles in Park or Neutral and shut off the ignition in both cars.When jump-starting a car, it was must to remember jumper cables typically have two clamps, one with the label “positive” in red and “negative” in black.Attach one of the red clips to the positive terminal of your battery. Attach the other red clip to the positive terminal of the other car. The similar way do for the negative terminals.Thus, when jump-starting a car, always remember the cables are in the right position.
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True/False, If you run Wireshark at work to capture traffic on your network without your boss's permission, you could be prosecuted under Section 2511 of the 18 U.S.C. 1030 (ECPA)
Answers
True. According to the Electronic Communications Privacy Act (ECPA), it is illegal to intercept electronic communications, including network traffic, without proper authorization.
Using Wireshark to collect network traffic at work without your boss's permission may be a violation of this statute, and you may be prosecuted under Section 2511 of 18 U.S.C. 1030. This legislation, which applies to both persons and businesses, is intended to preserve the privacy of electronic conversations and data. When monitoring network traffic or engaging in any other activity that may entail intercepting electronic communications, it is critical to gain necessary authorization and adhere to business rules and regulatory restrictions.
Failure to do so may result in significant legal implications such as fines, jail, and professional reputation harm.
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Sally did 300 j of work in 60 seconds. Calculate her power.
Answers
Answer:
5 Watts
Explanation:
Power = Work / Time
Power = 300 J / 60 s
Power = 5 J/s or 5 Watts
Therefore, Sally's power is 5 Watts.
Answer:
5w or 0.005kw
Explanation:
P=w/t
P=300/60
suggest in what ways burton could improve the process of producing snowboards, as well as their operations and their logistics systems, to strengthen and sustain their competitiveness, moving forward.
Answers
The ways that burton could improve the process of producing snowboards, as well as their operations and their logistics systems are; Explained below
Business Efficiency and ProductivityFor burton to improve their competitive advantage, they can adopt various business methods to improve their performance as follows;
Logistics and supply chain management are very important factors that can be used to improve upon the competitiveness of business. Thus, snowboards flow should be well managed to gain improvement in efficiency and effectiveness of delivery which will ensure patronage of prospective customers.
Logistics systems perform various operations that leads to the competitive advantage I spoke about earlier. Finally, the production department should ensure that they produce quality products such that customers are motivated to repurchase.
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World Without Engines: Explain what todays world without engines would be like? How would it change your life? The world? The way we do things? Please write in paragraph format and include introduction, body, and conclusion. DON'T ANSWER UNLESS YOU HAVE THE ANSWER!!!!!!!!! I WILL MARK BRAINLYEST
Answers
Answer:
the world will not be the same it will change dramticily and
things will not be the same
Explanation:
For a manufacturing process that produces copper tubing, a(n) would track the variability of the tubing's diameter. A. R-chart B. x-bar chart C. p-chart D.m-chart E. v-chart
Answers
A. R-chart An R-chart, also known as a range chart, is used to track the variability or dispersion of a manufacturing process.
It is commonly used in statistical process control (SPC) to monitor the consistency of a process over time.
In the case of copper tubing production, an R-chart would be suitable for tracking the variability of the tubing's diameter. The chart displays the range (the difference between the largest and smallest values) of a set of samples taken from the manufacturing process. By analyzing the range values, one can assess whether the process is producing tubing with consistent diameter or if there is excessive variability.
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When should engineers not participate in any matter involving a conflict of interest according to the code?
Answers
According to the code of ethics for engineers, engineers should not participate in any matter involving a conflict of interest when it can compromise their professional judgment and integrity. A conflict of interest can arise in situations where engineers have personal, financial, or other interests that could influence their decision-making or actions, potentially to the detriment of their clients or employers.
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You plan to take your hair blower to Europe, where the electrical outlets put out 240V instead of the 120 V seen in the United States. The blower puts out 1,660 W at 120 V. a. What current will your blower draw from a European outlet? b. What resistance will your blower appear to have when operated at 240 V?
Answers
The hair blower will draw approximately 6.92 Amperes of current drawn from the European outlet, and it will appear to have a resistance of approximately 34.68 Ohms when operated at 240 V.
What is the current drawn by the hair blower from a European outlet, and what resistance does it appear to have when operated at 240 V?The current drawn by the hair blower can be calculated using Ohm's Law, which states that current (I) is equal to the voltage (V) divided by the resistance (R).
In this case, the voltage is 240 V (European outlet) and the power output is 1,660 W. Using the formula P = IV, we can solve for the current:
a. Current (I) = Power (P) / Voltage (V) = 1,660 W / 240 V = 6.92 A
Therefore, the hair blower will draw approximately 6.92 Amperes of current from the European outlet.
b. To find the resistance (R) of the blower at 240 V, we can rearrange Ohm's Law to solve for resistance:
Resistance (R) = Voltage (V) / Current (I) = 240 V / 6.92 A = 34.68 Ω
So, when operated at 240 V, the hair blower will appear to have a resistance of approximately 34.68 Ohms.
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The no-load current of a transformer is 4.0 A at 0.25 p.f. when supplied at 250-V, 50 Hz. The number of turns on the primary winding is 200. Calculate the core loss component
Answers
The core loss component is 250W.
What is core loss?The term core loss refers to the total energy lost in the production of heat. Core loss is the loss due to the changing magnetization of the magnetic core, which is the sum of hysteresis loss and eddy current loss.
Core losses have two main causes ohmic or Joule heating caused by eddy currents induced by a changing magnetic field in a conducting medium, and losses due to cyclic reversals of magnetization in ferromagnetic materials, which are proportional to the area of the magnet. field hysteresis loop. Core loss is often measured using the Epstein frame method, which includes a primary and secondary coil.
therefore , by using this formula core loss can be calculated as
W =\(V_{1} I_{0}\)cosФ₀
= 250x 4x 0.25
= 250W.
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Which sentence with an introductory phrase is punctuated correctly?
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Examine this statement:
SELECT 3 * 2 + 2 / 4 FROM DUAL; What is the result?
Answers
Answer:
it is 2
Explanation:
this is sql command that return one line (from dual ) with taht math solved
The result of this SQL statement would be 6.5
Here is the breakdown of the calculation:
3 * 2 = 6
2 / 4 = 0.5
6 + 0.5 = 6.5
Define the term SQL.
SQL stands for Structured Query Language. It is a programming language used to manage and manipulate relational databases. SQL is used to communicate with a database, allowing users to create, read, update, and delete data from a database. SQL is widely used by software developers, database administrators, data analysts, and other professionals who work with data.
SQL consists of a set of commands that are used to interact with a database. These commands include SELECT, INSERT, UPDATE, DELETE, and others. SQL commands are used to retrieve data from a database, add new data, modify existing data, and delete data. SQL is used to create and manage database schemas, which define the structure of a database and the relationships between different tables.
The SQL statement SELECT 3 * 2 + 2 / 4 FROM DUAL; will produce a result of 6.5.
The statement is performing a simple arithmetic calculation, which involves multiplication, division, and addition. Here is the calculation part:
3 * 2 is calculated first, which gives us 6.
2 / 4 is calculated next, which gives us 0.5.
Finally, the results of step 1 and step 2 are added together, giving us the final result of 6.5.
Therefore, The keyword "FROM DUAL" is often used in Oracle databases to select a constant value. In this case, it doesn't have any impact on the calculation itself, as we're only performing a simple arithmetic operation.
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What would be the most likely scale factor to use for an n-gauge model train setup? (An n-gauge layout uses locomotives that are typically about five centimeters long, on a train platform that may be one meter by one meter.)
A. 1:100
B. 1:500
C. 100:1
D. 500:1
Answers
when inoculating a sterile deep, what tool should be used? a. needle b. pipette c. sterile swab d. loop