Or we can copy only the columns we want into the new table: O SELECT *INTO newtable [IN externaldb]FROM table1;O SELECT *INTO CustomersBackup2013 IN 'Backup.mdb'FROM Customers;O SELECT column_name(s)INTO newtable [IN externaldb]FROM table1;O The new table will be created with the column-names and types as defined in the SELECT statement. You can apply new names using the AS clause.
Answers
To copy all columns from table1 into a new table called newtable, you can use the following syntax:
SELECT * INTO newtable FROM table1;
This will create a new table with the same column names and data types as table1.
If you want to copy all columns from a table called Customers into a new table called CustomersBackup2013, and store it in an external database called Backup.mdb, you can use the following syntax:
SELECT * INTO CustomersBackup2013 IN 'Backup.mdb' FROM Customers;
This will create a new table called CustomersBackup2013 in the external database Backup.mdb, with the same columns and data types as Customers.
- If you only want to copy certain columns from table1 into a new table, you can specify the column names in the SELECT statement. For example:
SELECT column1, column2 INTO newtable FROM table1;
This will create a new table called newtable with only column1 and column2 from table1, with the same data types as in table1.
- Finally, if you want to apply new names to the columns in the new table, you can use the AS clause. For example:
SELECT column1 AS new_column1, column2 AS new_column2 INTO newtable FROM table1;
This will create a new table called newtable with two columns, new_column1 and new_column2, which contain the data from column1 and column2 in table1, respectively.
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Related Questions
A drive-through system at a fast food restaurant where the first facility takes the order, the second takes the money, and the third provides the food is an example of: multiple-channel, multiple-phase arrangement. single-channel, multiple-phase arrangement. single-channel, single-phase arrangement. single-channel, multiple-phase arrangement.
Answers
Answer:
single-channel, multiple-phase arrangement.
Explanation:
A single channel and a multiple phase arrangement system in a queue is the technique where a customer in a queue goes through the point where there is more than one point of activity.
In the context, in a food restaurant where there are many point of activity for a single channel of ordering food. Here in the first facility, it receives the order and second facility takes money while the other provides the food to the customer. This is an example of single channel and a multiple phase arrangement.
Name and define k, kc, and kic. explain the differences and the conditions under which each parameter applies. state the units for each parameter.
Answers
The differences and the conditions between k , kc & k1c under which each parameter applies is :
K - stress intensity factor. serves as a scale factor to define the magnitude of the crack-tip stress field. It is measured in MPa m1/2. Kc - critical stress intensity factory.KIc is the fracture toughness under plane strain.What is the difference between K - stress intensity factor & Kc - critical stress intensity factory ?K - stress intensity factor - The fracture strength of a material with a crack is determined using the critical stress intensity factor. The critical stress intensity factor of a ductile material is not a constant value like certain other material properties like elastic modulus; rather, it varies with the thickness of the material.The local stress conditions at the tip of an infinitely acute fracture in an elastic material are measured by the linear elastic stress intensity factor, or KI. Kc - critical stress intensity factory - The important stress intensity component K1C describes a material's resistance to fracture extension. The term "fracture strength" also applies to the stress intensity component. The determination of the material characteristic value of fracture mechanics under cyclic loading with constant amplitude is covered in ASTM E399, which is a standard.The essential stress intensity factor for the rapid development of cracks under specific conditions is known as the fracture toughness KC of a material. Such fracture propagation will be instantaneously catastrophic under prescribed-load boundary circumstances.Learn more about k, kc, and kic refer to :
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realizing the universal property of nands and/or nors, which single 2 input gate is represented with the schematic diagram shown?
Answers
The schematic diagram represents a NOR gate. The universal property of NANDs and NORs state that any logic gate can be implemented using only NANDs or NORs. Therefore, the diagram can be implemented using a single 2 input NOR gate.
What is NOR Gate?NOR gate is a digital logic gate which is the combination of both NOT and OR gate. It produces output as 1 only when all its inputs are 0. If any of its input is 1, it produces output as 0. It is also known as “Negated OR Gate”. It is symbolized by an OR Gate with a bubble on the output.
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when you define objects and the actions that can be performed on them, you are using ________ programming.
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When you define objects and the actions that can be performed on them, you are using object-oriented programming.
Object-oriented programming is a programming paradigm that is concerned with encapsulating data in the form of objects that may then be interacted with by sending messages. It is a technique for developing software using real-world objects, where objects can interact with one another in order to achieve a specific objective.
Object-oriented programming involves defining the behavior of objects in terms of what they can do, as well as the data that they contain. It is a technique for developing software that is structured around the concept of objects that are instantiated from classes.
Classes are user-defined data types that define the structure and behavior of objects.Object-oriented programming is a style of programming that is often used in modern software development. It is intended to make programming more intuitive, as it allows developers to model real-world scenarios more closely.
It also provides developers with a way to reuse code, as classes may be inherited from one another to create new objects with similar functionality.
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an unloading valve group of answer choices is used to maintain a high pump outlet pressure. is a two port device. is the same as a pressure relief valve. is used to provide a low-pressure flow path for pump output.
Answers
An unloading valve: A. is used to maintain a high pump outlet pressure.
What is an unloading valve?In Engineering, an unloading valve can be defined as a type of pressure relief valve that is typically designed and developed for the maintenance of a high pump outlet pressure in all hydraulic systems.
This ultimately implies that, an unloading valve avails a hydraulic system an opportunity or ability to maintain a constant high pump outlet pressure without causing any form of damage to the hydraulic pump and other components that are associated with it.
In conclusion, we can reasonably infer and logically deduce that the correct answer option is A ("is used to maintain a high pump outlet pressure").
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The two-second rule applies to vehicles traveling under?
Answers
Answer:The two-second rule is a rule of thumb by which a driver may maintain a safe trailing distance at any speed. The rule is that a driver should ideally stay at least two seconds behind any vehicle that is directly in front of his or her vehicle.
Explanation:
Mild neurotoxins can cause which of these physical effects?
Answers
Sarah fenced in her backyard. The perimeter of the yard is 18 feet, and the width of the yard is 4 feet. Use the perimeter formula to find the length of the rectangular yard in inches: p = 2l + 2w. (1 foot = 12 inches).
Answers
Answer: 72 inches!
Explanation:
The length of the rectangular yard in inches is 72 inches. This is calculated by using the perimeter formula, p = 2l + 2w, and substituting the known values: p = 2(18 feet) + 2(4 feet). This simplifies to p = 36 feet + 8 feet, which is equal to 44 feet. To convert this to inches, we multiply 44 feet by 12 inches per foot, which gives us a total of 528 inches. Therefore, the length of the rectangular yard in inches is 72 inches.
Dante uses ______ DSCP tags for QoS.
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Dante employs layer 3 QoS tagging called DSCP (Diffserv).
What does DSCP mean?In contemporary Layer 3 IP networks, Differentiated Services Code Point (DSCP) is a technique for categorizing and controlling network traffic as well as for delivering quality of service (QoS). Differentiated services, also known as DiffServ, is an IP-based computer networking architecture that defines a method for categorizing, controlling, and delivering quality of service to network traffic on contemporary IP networks. DSCP Score. Using the 6 bits, DiffServ Code Point (DSCP) produces 26 = 64 distinct values (0 to 63). describes the values of the DSCP standards. The remaining DSCP values can be altered to meet the QoS specifications.
How does DSCP QoS work?Network data traffic classification is determined by Quality of Service (QoS) DSCP Marking. This can be used to identify the network traffic that uses more bandwidth, is more important, and has a higher chance of dropping packets.
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This section contains I mini-cases. Each case describes a situation, explains your role, and requires you to apply what you learned in the chapter. Colonial Movers You are the IT manager at a regional moving company that recently merged with a major competitor. The company president asked you to prepare requirements for a new information system to support the combined company Tasks 1. Should employees be involved in developing the new system? If so, what should be their role? 2. What types of system requirements will you focus on? Explain each one in detail. 3. You decide to conduct a series of JAD sessions. Prepare a memo to participants, and include a detailed plan 4. What fact-finding methods could you use to collect information from employees at Colonial Movers? Suggest at least three methods, and explain the pros and cons of each.
Answers
In the case of Colonial Movers, involving employees in the development of the new information system is crucial. Their role should be to provide valuable insights, feedback, and requirements based on their knowledge and experience.
The focus of system requirements should include functional, performance, usability, and security aspects. Conducting Joint Application Design (JAD) sessions with a detailed plan can facilitate effective collaboration. Fact-finding methods such as interviews, surveys, and observation can be used to collect information from employees, each with its own pros and cons. In the development of the new information system for Colonial Movers, it is important to involve employees to ensure their perspectives and requirements are considered. Employees can play a valuable role in providing insights into the day-to-day operations, identifying pain points, and suggesting improvements. Their involvement can lead to a system that meets their needs and enhances their productivity. Their role may involve participating in requirements-gathering sessions, providing feedback on prototypes or system demonstrations, and participating in user acceptance testing.
The system requirements for the new information system should focus on different aspects. Functional requirements define what the system should do, such as managing customer data, scheduling moves, and generating invoices. Performance requirements address system speed and response times. Usability requirements ensure the system is user-friendly and intuitive. Security requirements focus on protecting sensitive data and preventing unauthorized access.
To conduct JAD sessions, a memo can be prepared for the participants outlining the objectives, agenda, and expected outcomes. The plan should include setting clear goals, identifying key participants, providing pre-session materials, facilitating group discussions, and documenting the results. This collaborative approach can help gather diverse perspectives and ensure that the new system meets the needs of both companies.
For fact-finding, various methods can be used. Interviews allow direct interaction with employees to gather detailed information, but they can be time-consuming and may not capture the full range of perspectives. Surveys can reach a larger audience and provide quantitative data, but they may lack depth and personal insights. Observation involves observing employees' tasks and processes in their work environment, providing valuable context but may be influenced by observer bias. Choosing a combination of these methods can provide a more comprehensive understanding of the employees' requirements and challenges.
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determine the largest intensity w of the uniform loading that can be applied to the frame without causing either the average normal stress or the average shear stress at section b–b to exceed s
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The largest intensity of uniform loading (w) that can be applied to the frame without exceeding the average normal stress or average shear stress at section b-b is [insert numerical value here].
To determine the largest intensity of uniform loading that can be applied to the frame without causing excessive stress at section b-b, we need to consider the average normal stress and average shear stress at that section.
The average normal stress is the ratio of the applied load to the cross-sectional area of the frame at section b-b. It represents the amount of force distributed over the area. If this stress exceeds the specified limit (s), it can lead to deformation or failure of the frame.
The average shear stress, on the other hand, is the force acting parallel to the cross-sectional area divided by the area itself. It indicates the resistance to the shearing forces within the frame. Exceeding the specified limit (s) for shear stress can also lead to structural instability.
To find the largest intensity of uniform loading (w) that satisfies both conditions, we need to analyze the frame's geometry, material properties, and any other relevant design considerations. This analysis typically involves mathematical calculations, structural analysis software, and referencing applicable design codes and standards.
By considering the frame's dimensions, material strength, and the allowable stress limit (s), engineers can perform calculations to determine the maximum load that the frame can sustain without surpassing the average normal stress or average shear stress limits at section b-b.
It's important to note that this process requires a comprehensive understanding of structural mechanics and engineering principles. Moreover, it is crucial to consider other factors such as safety factors, dynamic loads, and any specific requirements or constraints of the project.
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Determine the length of welds required to transmit a load 54.5 KN between 12.7mm. thick plates, when the plates are to be joined by 1) Two parallel fillet welds. 2) Two transverse fillet welds.
Answers
For the parallel fillet weld, the length required is 24.52mm and for transverse fillet welds, the longer fillet weld required is 24.39 mm and the length of the shorter fillet weld required is 6.13 mm.
What is the length to transmit the loadThe length of weld required to transmit a load between two plates depends on the type of weld used and the strength of the material being welded. For the given scenario:
Two parallel fillet welds:
The length of each fillet weld required can be calculated using the following formula:
L = (2 x F x P) / (0.7 x T)
where L is the length of each fillet weld, F is the applied force (54.5 KN), P is the perimeter of the weld (2 x length of the joint), T is the thickness of the plate (12.7 mm), and 0.7 is a constant. Substituting the values, we get:
L = (2 x 54.5 x 2) / (0.7 x 12.7) = 24.52 mm
Therefore, the length of each fillet weld required is 24.52 mm.
Two transverse fillet welds:
The length of each fillet weld required in this case can be calculated using the same formula as above, but with the perimeter of the weld being the sum of the lengths of the two sides being welded. Since the two fillet welds are transverse, their lengths will be different. Assuming one fillet weld is longer than the other, we can calculate their lengths as follows:
L1 = (F x P1) / (0.7 x T)
L2 = (F x P2) / (0.7 x T)
where L1 and L2 are the lengths of the two fillet welds, P1 and P2 are the perimeters of the two sides being welded, and all other variables are the same as before. We can assume that the longer fillet weld is on the side with the higher applied force, so we have:
P1 = 2 x length of joint
P2 = length of joint
Substituting the values, we get:
L1 = (54.5 x 2 x 2) / (0.7 x 12.7) = 24.39 mm
L2 = (54.5 x 1) / (0.7 x 12.7) = 6.13 mm
Therefore, the length of the longer fillet weld required is 24.39 mm and the length of the shorter fillet weld required is 6.13 mm.
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Consider a lie detector called the Computerized Voice Stress Analyzer (CVSA). The manufacturer claims that the CVSA is 98% accurate and, unlike a polygraph machine, will not be thrown off by drugs and medical factors. However, laboratory studies by the U.S. Defense Department found that the CVSA had an accuracy rate of 49.8%, slightly less than pure chance. Suppose the CVSA is used to test the veracity of four suspects. Assume that the suspects’ responses are independent. a. If the manufacturer’s claim is true, what is the probability that the CVSA will correctly determine the veracity of all four suspects? b. If the manufacturer’s claim is true, what is the probability that the CVSA will yield an incorrect result for at least one of the four suspects? c. Suppose that in a laboratory experiment conducted by the U.S. Defense Department on four suspects, the CVSA yielded incorrect results for two of the suspects. Make an inference about the true accuracy rate of the new lie detector.
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The probability of observing two incorrect results out of four, given that the CVSA is 49.8% accurate, is 0.375, or 37.5%.This result suggests that the true accuracy rate of the CVSA is not as high as the manufacturer’s claim of 98% but is instead closer to the accuracy rate found in the laboratory experiment (49.8%).
a) Suppose the manufacturer’s claim is true, and the CVSA is 98% accurate. The probability of the CVSA will correctly determine the veracity of all four suspects is obtained as follows:The probability that the CVSA will correctly determine the veracity of one suspect is P(Correct) = 0.98, and the probability that the CVSA will incorrectly determine the veracity of one suspect is P(Incorrect) = 1 - P(Correct) = 0.02.The CVSA has to correctly determine the veracity of all four suspects. The probability of this occurring is:P(Correctly determine the veracity of 4 suspects) = P(Correct) * P(Correct) * P(Correct) * P(Correct) = (0.98)^4 = 0.922 = 92.2%.Therefore, the probability that the CVSA will correctly determine the veracity of all four suspects is 0.922, or 92.2%.b) If the manufacturer’s claim is true, the probability that the CVSA will yield an incorrect result for at least one of the four suspects is obtained by using the complementary probability of correctly determining the veracity of all four suspects as shown in (a). The probability that the CVSA will yield an incorrect result for at least one of the four suspects is:P(At least one incorrect) = 1 - P(Correctly determine the veracity of 4 suspects) = 1 - 0.922 = 0.078 = 7.8%.Therefore, the probability that the CVSA will yield an incorrect result for at least one of the four suspects is 0.078, or 7.8%.c) Suppose that in a laboratory experiment conducted by the U.S. Defense Department on four suspects, the CVSA yielded incorrect results for two of the suspects. The probability of observing this outcome is obtained by assuming that the CVSA is 49.8% accurate (slightly less than pure chance) and is calculated using the binomial probability distribution as follows:The probability of two incorrect results out of four is:P(X = 2) = (4C2) * (0.498)^2 * (1 - 0.498)^(4 - 2) = 6 * 0.248 * 0.252 = 0.375.
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effects of salinity water on alfalfa
Answers
6.
A mobile welding machine of mass 80 kg was rolling freely on a horizontal surface
at speed of 5 m/s when locks to its castor wheels are applied, causing all four wheels
to stop rotating. The machine skidded a distance s-4 m before coming to rest.
Determine
the magnitude of normal reaction of each wheel
(b) the coefficient of kinetic friction between the wheels and the ground.
Answers
The magnitude of reaction for the wheel is 250 N. The coefficient of kinetic energy between the wheel and ground is 0.32.
What is friction?
The friction is given as the stop force acted by the surface to the moving object.
For the calculation of magnitude of normal reaction:\(v^2=u^2+2as\)
Substituting the values of the initial velocity (u), final velocity (v) and the distance (s) at the contactless surface, the acceleration is given as:
\(0=(5)^2+2a\;\times\;4\\a=3.125\;\rm m/s^2\)
The force can be given as:
\(F=ma\\F=80\;\text{kg}\;\times\;3.125\; \rm {m/s^2}\\\textit F=250\;N\)
The magnitude of reaction for the wheel is 250 N.
The coefficient of friction (\(\mu_k\)) is given as:\(\mu_kmgs=\dfrac{1}{2}mv^2\\\)
Substituting the values:
\(\mu_k\;\times\;80\;\times\;9.8\;\times\;4=\dfrac{1}{2}\;\times\;80\;\times\;5^2\\\mu_k=\dfrac{5^2}{2\;\times\;9.8\;\times\;4}\\\mu_k=0.32\)
The coefficient of kinetic energy between the wheel and ground is 0.32.
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1. The term lefty loosey, righty tighty is used to prevent what?
Answers
Answer:
Used to recall the direction a standard screw
A ________ defines the boundaries of a system in a work breakdown structure (WBS).
A) trade-off
B) code
C) scope
D) scale
Answers
scope. In project management, a work breakdown structure (WBS) is a hierarchical decomposition of a project into smaller and more manageable components. So correct answer is C
It helps to organize and structure the project's tasks and deliverables, and to define the project's scope. The scope of a project refers to the boundaries and limitations of the project, including the specific goals, objectives, requirements, and deliverables that are within the project's purview.In the context of a WBS, the scope defines the boundaries of the system that is being broken down into smaller components. It outlines the overall objectives and goals of the project and identifies the specific tasks and deliverables that are required to achieve those objectives. The scope helps to ensure that the project team is focused on the right tasks and that they understand the overall purpose and goals of the project.In addition to defining the boundaries of the system, the scope also helps to identify any constraints or limitations that may impact the project. This may include factors such as budget, schedule, resources, or external factors such as regulations or legal requirements. By clearly defining the scope of the project, the project team can better manage these constraints and ensure that the project stays on track.In summary, the scope is a critical component of a work breakdown structure (WBS) as it defines the boundaries of the system being broken down into smaller components. It outlines the objectives and goals of the project and identifies the specific tasks and deliverables required to achieve those objectives. By clearly defining the scope, the project team can better manage constraints and ensure the project stays on track.
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A catapult has two rubber bands, each with a square cross-section with a width 4 mm and length 300 mm. In use its arms are stretched to three times their original length before release. Assume the the modulus of rubber is 10-3 GPa and that it does not change when the rubber is stretched. How much energy is stored in the catapult just before release?
Answers
The energy stored in the two rubber bands of the catapult just before release can be calculated as follows: Area of Rubber Bands = (4 mm) x (300 mm) = 1200 mm2, Modulus of Rubber = 10-3 GPa = 10,000 N/mm2 Strain = (3 x Original Length) / (Original Length) = Energy = (1200 mm2) x (10,000 N/mm2) x (3) = 36,000,000 Nmm or 36,000 J
What is energy?Energy is the capacity of a physical system to do work or produce heat. It is the fundamental source of virtually all movement and change on Earth. In physics, energy is a property of objects which can be transferred to other objects or converted into different forms. Examples of energy include light, electricity, heat, sound, and kinetic energy. Energy can be generated from a variety of sources including fossil fuels, nuclear power, and renewable sources such as wind, solar, and hydropower. Energy plays a crucial role in the economic and social development of societies, enabling the production of goods and services and the delivery of basic services such as heating, cooling, and lighting. The efficient and responsible use of energy is essential to sustainable development.
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write the answers in your own words. name four important welding processes. (obj. 1-4)
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The fusion welding process can be broken down into the following main categories:
The fundamental difference between fusion welding and solid-state welding is that in fusion welding, the base materials being joined are melted and fused together at their interface, whereas in solid-state welding, the materials are joined without melting by applying heat and pressure to cause diffusion and bonding between the atoms at the interface.
Gas tungsten arc welding (GTAW or TIG), gas metal arc welding (GMAW or MIG), shielded metal arc welding (SMAW or stick welding), and submerged.
In other words, whereas in solid-state welding, the joint is formed by atomic diffusion between the two materials, fusion welding produces a molten pool that solidifies into a joint.
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A farmer wants to buy a 10 kg bag of fertilizer (organic soil). They have the choice between two merchants. Merchant A sells the 10 kg bag for $10 and the bag indicates that the fertilizer is completely dry. Merchant B sells the 10 kg bag for 8$, and the bag indicates that the fertilizer has a water content of 20%. If the farmer can only use the solid constituents of the bag, which merchant has the better deal?
Answers
Answer:
Since the farmer wants to buy a 10 kg bag of fertilizer, he should buy it from merchant A. However, Merchant A and B are selling at the same price for a unit value. In other words, Both Merchant A and B are selling 1kg of dry fertilizer for $1.
Explanation:
Which merchant has the better deal means which merchant offers the farmer a better deal.
For Merchant A, 10 kg bag = $10
meaning it contains a real 10 kg bag of dry fertilizer which the farmer can use without losing any Kg to drying.
While for Merchant B, 10 kg bag = $8
where the 10kg = 80% dry fertilizer + 20% water content
But the farmer can only use the solid constituents of the bag which means,
Merchant B is giving 80/100 x 10Kg of dry fertilizer for $8
That is, 8kg for $8
Since the farmer wants to buy a 10 kg bag of fertilizer, he should buy it from merchant A. However, Merchant A and B are selling at the same price for a unit value. In other words, Both Merchant A and B are selling 1kg of dry fertilizer for $1.
Air enters the turbine of an ideal Brayton cycle at a temperature of 1200 °C. If the cycle pressure ratio is 8:1, find the net work output (kJ/kg) of the turbine. Assume the cold air standardO 580O 831O 474O 538O.660
Answers
The net work output of the turbine is approximately 474 kJ/kg.
The Brayton cycle is a thermodynamic cycle used in gas turbine engines. The cycle consists of four processes: isentropic compression, constant pressure heat addition, isentropic expansion, and constant pressure heat rejection.
Given that the cycle pressure ratio is 8:1, the pressure ratio across the turbine is also 8:1. Assuming an ideal Brayton cycle, the net work output of the turbine can be calculated using the following equation:
W_turbine = cp(T3 - T4)
where cp is the specific heat at constant pressure, T3 is the temperature at the turbine inlet, and T4 is the temperature at the turbine outlet.
To calculate T3, we can use the following equation:
T3 = T2 (PR)^((γ-1)/γ)
where T2 is the temperature at the compressor outlet, PR is the pressure ratio, and γ is the ratio of specific heats.
Assuming a cold air standard and using the given values, we obtain:
γ = 1.4 (for air)
T2 = T1 (PR)^(γ-1) = 1200°C (8)^(1.4-1) = 2645.5 K
T3 = 2645.5 K (8)^(0.4/1.4) = 1571 K
To calculate T4, we can use the fact that the turbine is isentropic, which means that the entropy remains constant. Therefore, we can use the following equation:
s3 = s4
where s is the specific entropy. Assuming a cold air standard, the specific entropy can be calculated using the following equation:
s = cp ln(T/T0) - R ln(p/p0)
where T0 and p0 are reference values (usually taken to be 298 K and 1 atm), and R is the gas constant. Substituting the given values, we obtain:
s3 = 1.005 ln(1571/298) - 0.287 ln(8/1) = 5.84 J/kg.K
Using the fact that s4 = s3 and assuming a cold air standard, we can calculate T4 using the following equation:
T4 = T0 exp((s3 - cp ln(T0/T4))/cp) = 563 K
Finally, substituting the calculated values into the equation for the network output, we obtain:
W_turbine = 1.005 (1571 - 563) = 474 kJ/kg
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In _____________ compression design the signal is split at the input, and one signal is used to compress the other slightly delayed split signal.
Answers
Answer:
Feed Forward
Explanation:
In FEED FORWARD compression design the signal is split at the input, and one signal is used to compress the other slightly delayed split signal.
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What energy transformation takes place when you turn on a light
Answers
Answer:
From electrical energy to radiation
Explanation:
A light bulb converts electrical energy to light, which is nothing more than radiation. Don't regard radiation as a bad thing, this light is non-iodizing radiation, which does not have the possibility to alter our DNA, and thus it's safe.
The simplest example can be found in old lights (obsolete now because they are vastly inefficient). This lights were just resistors which turned electrical energy into heat. A very hot material reflects light in the form of radiation, as described above.
Technologies like LEDs are more complicated to explain.
A long conducting rod of rectangular cross section (20 mm 30 mm) and thermal conductivity k 20 W/m K experiences uniform heat generation at a rate q . 5 107 W/m3, while its surfaces are maintained at 300 K. Using a finite-difference method with a grid spacing of 5 mm, determine the temperature distribution in the rod.
Answers
Answer:
Explanation:
We are assuming that there is
a steady state two dimensional conduction
constant properties
uniform volumetric heat generation
From symmetry, we will be determining 6 unknown temperatures.
See attachment for calculation and and tabulation
With T(s) = 300 K, the set of equations were written directly into the IHT work space and solved for nodal temperatures.
The result is seen in the second attachment
1. A thin-walled cylindrical pressure vessel is capped at the end and is subjected to an internal pressure (p). The inside diameter of the vessel is 6 ft and the wall thickness is 1.5 inch. The vessel is made of steel with tensile yield strength and compressive yield strength of 36 ksi. Determine the internal pressure required to initiate yielding according to (a) The maximum-shear-stress theory of failure, and (b) The maximum-distortion-energy theory of failure, if a factor of safety (FS) of 1.5 is desired.
Answers
Question 17 of 20:
Select the best answer for the question.
17. Which of the following accurately describes circuits?
A. In a series circuit, the amount of current passing through each part of the circuit may vary.
O B. In a series circuit, the current can flow through only one path from start to finish.
C. In a parallel circuit, the same amount of current flows through each part of the circuit.
OD. In a parallel circuit, there's only one path for the current to travel.
O Mark for review (Will be highlighted on the review page)
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Answers
The option that accurately describes circuits is this: B. In a series circuit, the current can flow through only one path from start to finish.
What describes circuits?The option that best describes circuits is that in a series circuit the flow of current moves from one point to another. The current simply flows on a single line and there are no diversions.
Also, the addition of the resistors in a series circuit will yield the total resistance present in the circuit. So, of all the options listed about circuits, option B is the most accurate.
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The Role of Fuel Cells in Renewable Energy Solutions
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Answer:
chemical energy directly
Why is it important to understand email netiquette?
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Answer:
Email etiquette is important
Explanation:
It is important to understand how to use correct email etiquette because it helps you communicate more clearly. It also makes you seem a bit more professional too. For example depending in who you're emailing like say you're emailing your teacher for help then here's how it'd go:
Dear(teacher name, capitalize, never use first name unless they allow it)
Hello (teacher name), my name is (first and last name) from your (number class) and I was wondering if you could please help me out with (situation, be clear on what you need help with otherwise it won't get through to them)? If you could that would be greatly appreciated!
Sincerely,
(your name first and last)
A coral reef is in danger of being destroyed by a seaside construction project. Which of the following best relates to how an engineer would approach this problem?
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Answer:Bio team
Explanation:
upon first connection to a pse, what level of resistance does a pd indicate that it has?
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When a Power Sourcing Equipment (PSE) is connected to a Powered Device (PD) for the first time, the PD indicates the level of resistance it has by presenting a certain value of resistance to the PSE. This value is called the initial or startup resistance.
The initial resistance of a PD depends on the type of PD and the standard it complies with. Generally, there are two types of PDs: the Class 0 PDs and the Class 1-4 PDs.
Class 0 PDs are devices that do not have the capability to communicate with the PSE and do not require any power from the PSE for operation. They present a very high initial resistance (typically more than 100kΩ) to the PSE, indicating that they are non-compliant devices.
On the other hand, Class 1-4 PDs are devices that have the ability to communicate with the PSE and negotiate for power delivery. They present a lower initial resistance to the PSE (typically between 1kΩ to 25kΩ), indicating that they are compliant devices.
The specific value of initial resistance for a PD depends on the power class it belongs to. The IEEE 802.3af standard defines four power classes for PDs based on the maximum power they can consume: Class 0 (less than 4 watts), Class 1 (4 watts), Class 2 (7 watts), and Class 3 (15.4 watts). The higher the power class, the lower the initial resistance of the PD.
In summary, the initial resistance of a PD upon first connection to a PSE depends on the type of PD and the power class it belongs to. Class 0 PDs present a high initial resistance (typically more than 100kΩ), while Class 1-4 PDs present a lower initial resistance (typically between 1kΩ to 25kΩ), with the specific value depending on the power class.
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