Select the best answer for the question. 4. What's the average value of an AC voltage that has a maximum peak voltage of 80 VAC? O A. 50.96 VAC O B. 160 VAC O C. 56.56 VAC O D. 38.31 VAC O Mark for review (Will be highlighted on the review page) << Previous Question Next Question >> M​

In Iowa courts, the testimony of a licensed engineer or land surveyor, when presented as an expert witness, can be challenged by the opposing attorney.

The opposing attorney has the right to cross-examine the expert witness and challenge their testimony through questioning and presenting counterarguments or conflicting evidence. This is a fundamental aspect of the legal process that allows for the exploration of different perspectives and the evaluation of the credibility and accuracy of expert testimony. By challenging the testimony, the opposing attorney aims to test the expert's qualifications, methods, reasoning, and conclusions to present a comprehensive and well-rounded view to the court. It is through the adversarial process that the court can weigh the evidence and make an informed decision. Therefore, in Iowa courts, the testimony of a licensed engineer or land surveyor, like any other expert witness, can be subject to challenge by the opposing attorney.

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Answer:

the magnitude of F_A is 752 N

the direction theta of F_A is 57.9°

Explanations:

Given that,

Resultant force = 1330 N in x direction

∑Fx = R

from the diagram of the question which i uploaded along with this answer

FB = 800 N

FAsin∅ + FBcos30 = 1330 N

FAsin∅ = 1330 - (800 × cos30)

FA = 637.18 / sin∅

Now ∑Fx = 0

FAcos∅ - FBsin30 = 0

we substitute for FA

(637.18 / sin∅)cos∅ = 800 × sin30

637.18 / 800 × sin30 = sin∅/cos∅

and we know that { sin∅/cos∅ = tan∅)

so tan∅ = 1.59295

∅ = 57.88° ≈ 57.9°

THEREFORE FROM THE EQUATION

FA = 637.18 / sin∅

we substitute ∅

so FA = 637.18 / sin57.88

FA = 752 N

Answer:

car a is moving faster than the car b

Answer:

B: Car A and car B are moving in opposite directions.

C: Car A is moving faster than car B.

E: Car A and car B are moving toward each other until they cross over.

Explanation:

I just did the assignment on EDGE2020 and it's 200% correct!  

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Answer:

Carpenter's square

Explanation:

The most common hand tool used to measure or set angles with its application extending to setting angles of roofs and rafters. Another name of a Carpenter's square is a framing square.

Other hand tools that are used to measure angles are;

Hotter materials typically have lower densities when compared with colder materials.

This difference in density occurs because heat causes materials to expand, leading to a decrease in their density.

As hot material expands and becomes less dense, it rises above the colder, denser material. Conversely, cold material, being denser, tends to sink below the hot material.

This movement of hot and cold materials is known as convection, which is an essential process in various natural phenomena, such as weather patterns and the circulation of fluids in the Earth's mantle.

Overall, the relationship between temperature, density, and convection is crucial in understanding the behavior of materials in different temperature conditions.

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I completely agree that a proactive stance is crucial when it comes to sunbathing on the beach. Sun exposure can cause a variety of DNA damage, which can ultimately lead to skin cancer. The types of DNA damage that sunbathers should be aware of include:

1. UV-induced DNA damage: UV radiation from the sun can cause damage to the DNA in skin cells, leading to mutations that can increase the risk of skin cancer.

2. Oxidative DNA damage: The sun can also generate reactive oxygen species (ROS) that can damage DNA by causing breaks and other changes.

3. Thymine dimers: UV radiation can cause thymine dimers, which are abnormal bonds between adjacent thymine bases in DNA. These dimers can interfere with DNA replication and transcription and may lead to mutations.

4. Photoaging: The sun can also cause premature aging of the skin, which is characterized by wrinkles, dryness, and other signs of damage.

Therefore, it's essential to take proactive steps to protect your skin before and during sun exposure. This can include wearing protective clothing, applying sunscreen with a high SPF, seeking shade during peak sun hours, and staying hydrated. By being proactive, you can reduce your risk of DNA damage and protect your skin from the harmful effects of the sun.

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The annual electricity generation per year, E = 8755.88 MWh/year.

Hours per year that the turbine will be shutdown due to excessive winds,          T = 4.0883 hours/year

Electricity is a set of physical phenomena related to the presence and movement of matter with an electric charge. Magnetism and electricity are both components of the phenomenon known as electromagnetism, according to Maxwell's equations.

Lightning, static electricity, electric heating, electric discharges, and a variety of other everyday occurrences all involve electricity.

When there is a charge present, whether positive or negative, an electric field is formed. When electric charges move, they generate an electric current, which also produces a magnetic field. When a charge is placed in an electric field that is not zero, it will experience a force.

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People in swimming pools are particularly vulnerable to electric shock due to mixing electricity, water, and people with different levels of swimming ability in the same environment.

Swimmers may feel a tingling sensation or not be able to move. Muscle cramps are another early sign of electric shock. You may observe swimmers moving frantically away from an area or lying motionless in the pool. If you notice this behavior, immediately turn off the power to the pool.You can get electrocuted in a swimming pool as a result of: (1) faulty electrical wiring to pool equipment such as underwater lights, pumps, filters and vacuums; (2) no GFCI (Ground-Fault Circuit-Interrupters) protections for outlets and circuits; and (3) electrical appliances and extension cords entering the water.Going in too soon after a pool's been shocked can potentially cause skin, eye, and even lung problems. It's tough to wait to take a dip, but it's not worth messing with your health.

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To determine the allowable load P, we need to calculate the shear and normal stresses at each connection. The shear stress at each connection can be calculated using the equation τ = P/A, where P is the load and A is the area of the pin.

The normal stress at each connection can be calculated using the equation σ = P/A, where P is the load and A is the cross-sectional area of the link. Once the shear and normal stresses have been calculated, we can compare them to the ultimate shear and normal stresses to determine the allowable load. The allowable load will be the load that produces a shear and normal stress that is equal to or less than the ultimate shear and normal stresses, multiplied by the factor of safety.

To calculate the allowable load, we need to first calculate the shear and normal stresses at each connection. The shear stress at each connection can be calculated using the equation τ = P/A, where P is the load and A is the area of the pin. The area of the pin can be calculated using the equation A = πr2, where r is the radius of the pin. The normal stress at each connection can be calculated using the equation σ = P/A, where P is the load and A is the cross-sectional area of the link. The cross-sectional area of the link can be calculated using the equation A = bh, where b is the width of the link and h is the height of the link. Once the shear and normal stresses have been calculated, we can compare them to the ultimate shear and normal stresses to determine the allowable load. The allowable load will be the load that produces a shear and normal stress that is equal to or less than the ultimate shear and normal stresses, multiplied by the factor of safety.

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As the temperature of the material increases, the potential energy of the molecules increases. Thermal expansion occurs due to changes in temperature, and interatomic distances increase as potential energy increases.

Thermal expansion is used in a variety of applications such as rail buckling, engine coolant, mercury thermometers, joint expansion, and others.

It is to be noted that an application of the concept of liquid expansion in everyday life concerns liquid thermometers. As the heat rises, the mercury or alcohol in the thermometer tube moves in only one direction. As the heat decreases, the liquid moves back smoothly.

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The basic requirement of measurements is to have a standard or reference point against which to compare the quantity being measured. This standard or reference point should be well-defined and stable, and the measurement process should be repeatable and consistent. Additionally, it is important to ensure that the measurement equipment is calibrated and in good working condition.

Answer:

The most basic requirement for measurements is the presence of a standard or reference point against which the quantity being measured can be compared. The measurement process should be repeatable and consistent, and the standard or reference point should be well-defined and stable. Furthermore, ensure that the measurement equipment is calibrated and in good working order.

Explanation:

Answer:

As the asteroid falls closer to the Earth's surface its Gravitational Potential energy decreases and its Kinetic energy increases.

spanish

Explanation:

the above question is written in spanish

Lens shades 4 to 6 are ideal for gas welding or oxyfuel torch welding/ oxyfuel gas cutting because In AWS Z49.1, the numbers for welding lens shades range from 4 to 14. Lens shades 4 to 8 are useful for low light intensity welding and cutting tasks such as gas cutting, brazing, or soldering, among others.

Selecting the right lens shade for welding:

The first and most important point to remember is to never look at welding without wearing black safety glasses or a suitable helmet. Next, what is the appropriate glass shade for various welding processes?

Looking directly at the welding arc without eye protection, or failing to follow this rule, can result in varying degrees of eye burn.

These burns do not usually result in permanent damage, but they can be excruciatingly painful for several days after exposure.

A helmet-style head shield, as shown in the figure below, is standard equipment for shielding the welder's face and eyes from the arc's direct rays.

To reduce reflection, these shields are typically made of a non-flammable insulating material and are black or gray in color. They are designed to shield the face, neck, and ears from the arc's direct radiant energy.

Glass lens shade for Gas welding and Gas cutting:

Lens shades 4 to 6 are ideal for gas welding or oxyfuel torch welding. The gas lens for oxyfuel gas cutting is determined by the material thickness to be cut, and the same is true for OFW welding, where the thickness to be welded determines the lens shade.

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Following is the PLC program for the given situation:

EXAMINE ON instruction is used to detect a momentary switch. It means that the switch is detected only when it changes from OFF to ON condition. For instance, Pushbutton X1 in the PLC program given above turns ON only when it is pressed and remains depressed for five seconds. Similarly, Pushbutton X2 turns ON only when it is pressed five times in a row.

The instruction TON (Timer On Delay) is used to delay the program execution for a specific period. In the PLC program given above, TON instruction is used to delay the turning ON of Lamp Q3 for 5 seconds. Therefore, when the Pushbutton X1 is depressed for 5 seconds, Lamp Q3 turns ON.

EXAMINE OFF instruction is used to detect the release of a momentary switch. It means that the switch is detected only when it changes from ON to OFF condition. For instance, Pushbutton X1 in the PLC program given above turns OFF only when it is released after it is depressed for five seconds. Similarly, Pushbutton X2 turns OFF only when it is pressed five times in a row. 

After Pushbutton X1 is kept depressed for 5 secs, Lamp Q3 turns ON. Lamp Q3 can only be turned OFF if when Pushbutton X2 is pressed 5 times. The sequence is designed in such a way that it can be repeated, and all pushbuttons used are normally-open type.

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Answer:

Car Payments. Making payments on your car is the biggest, most obvious expense of your vehicle. ...

Insurance. Insurance is another primary expense to consider when budgeting for a new car. ...

Gas. ...

Maintenance. ...

Fees & Taxes.

Explanation:

Answer:

Owning a car is expensive. Between the price of the vehicle, financing costs, insurance, taxes, and maintenance, owning one —let alone two — cars can drain your bank account quickly.

Explanation:

Answer:

77 lb

Explanation:

Equation: F₁d₁ = F₂d₂

Knowns:

d₁ = 30 ft

F₂ = 105 lb

d₂ = 22 ft

Solving for F₁:

1). F₁•30 = 105•22

2). F₁•30=2,310

3).\(\frac{F_1\cdot 30}{30}=\frac{2310}{30}\)

4). F₁ = 77 lb

Answer:

10 ohms Ω

Explanation:

V = IR

120 = I(12)

120/12 = 10Ω

Primary functions: Maintaining the internal temperature within a specified range.Failure mode of the primary function: The internal temperature of the fridge falls outside the specified range of 2°C-8°C. 3.2

The corresponding functional failures of the function mentioned in Q3.1 are:1. Compressor failure.2. Electrical failure.3. Sensor failure.4. Fan failure.3.3 Identify two failure modes of the failures mentioned in Q3.2.Failure modes of compressor failure: Overheating and physical damage.Failure modes of electrical failure: Overheating and complete failure of electrical systems.Failure modes of sensor failure: Loss of calibration and reading accuracy.Failure modes of fan failure: Bearing failure and motor failure.3.4 Identify the corresponding failure effects of the failure modes mentioned in Q3.3.Corresponding failure effects are:

1. Overheating could lead to melting of internal plastic components.

2. Physical damage could lead to the compressor seizing, which could prevent the fridge from cooling.

3. Overheating could lead to melting of internal components, which could short-circuit and damage the electrical system.

4. Complete failure of electrical systems could result in the fridge not functioning at all

.5. Loss of calibration could lead to the temperature sensor displaying incorrect temperature readings, resulting in incorrect internal temperature ranges.

6. Reading accuracy could lead to the temperature sensor displaying incorrect temperature readings, resulting in incorrect internal temperature ranges.

7. Bearing failure could lead to the fan not rotating, which could prevent air from circulating, resulting in an increase in the internal temperature.

8. Motor failure could lead to the fan not rotating, which could prevent air from circulating, resulting in an increase in the internal temperature.

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IntroductionMicrosoft Project is a project management software product, developed and sold by Microsoft. Microsoft Project is designed to assist project managers in planning, monitoring, and reporting on projects.

After reviewing Microsoft Learning Resources for this week, this project was created using MS Project.Fifteen tasks for the project:

Task 1: Introduction of the projectTask 2: Planning of the project

Task 3:  Execution of the projectTask 4: Testing of the projectTask 5: Acceptance of the projectTask 6: User documentation of the projectTask 7: Training of the projectTask 8: Development of project requirementsTask 9: Development of project architectureTask 10: Designing of the projectTask 11: Development of the projectTask 12: Quality assurance and testing of the projectTask 13: Delivery of the projectTask 14: Closure of the projectTask 15: Project reviewAdd a milestone:Milestone 1: Planning of the projectEstablish durations for each task:Task 1: 1 DayTask 2: 2 DaysTask 3: 5 DaysTask 4: 3 DaysTask 5: 2 DaysTask 6: 2 DaysTask 7: 1 DayTask 8: 2 DaysTask 9: 1 DayTask 10: 4 DaysTask 11: 10 DaysTask 12: 7 DaysTask 13: 1 DayTask 14: 2 DaysTask 15: 1 DayEstablish precedence relationships for each task:Task 1: Successor is Task 2Task 2: Successor is Task 3Task 3: Successor is Task 4Task 4: Successor is Task 5Task 5: Successor is Task 6Task 6: Successor is Task 7Task 7: Successor is Task 8Task 8: Successor is Task 9Task 9: Successor is Task 10Task 10: Successor is Task 11Task 11: Successor is Task 12Task 12: Successor is Task 13Task 13: Successor is Task 14Task 14: Successor is Task 15Include at least one SS relationship:There are no SS relationships in this project.Include at least one FF relationship:Task 1 FF relationship to Task 3Group these tasks into at least three phases:Phase 1: Tasks 1-5Phase 2: Tasks 6-10Phase 3: Tasks 11-15Save the file; include your last name in the file name (for example: yourlastname_project.mpp):Kumar_Project.mppChallenges faced:I did not face any challenges while creating this project using MS Project. MS Project is user-friendly and easy to navigate. It took me about an hour to complete this project.

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True. Spray ponds on rooftops have indeed made a comeback in recent years due to their ability to cool the roof and reduce the solar load. These innovative systems, also known as rooftop cooling ponds or green roofs, have gained popularity as sustainable solutions for mitigating the urban heat island effect and improving energy efficiency in buildings.

Spray ponds work by utilizing water evaporation to dissipate heat from the roof surface. The water is sprayed onto the roof and then evaporates, absorbing the excess heat in the process.

This evaporation-driven cooling effect helps to lower the temperature of the roof, reducing the need for air conditioning and minimizing the solar heat gain inside the building.

The resurgence of spray ponds can be attributed to the increasing awareness of the environmental and economic benefits they offer. By reducing the solar load, they help to lower energy consumption, decrease cooling costs, and improve the overall thermal performance of buildings.

Additionally, they contribute to the reduction of greenhouse gas emissions and enhance urban aesthetics.

Furthermore, advancements in technology and materials have made spray pond systems more efficient, cost-effective, and easier to install and maintain.

These factors, combined with the growing emphasis on sustainable building practices, have contributed to the renewed interest in rooftop spray ponds as a viable and eco-friendly solution for cooling roofs.

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Place a metal paper clip on a table and slowly bring each electromagnet closer to the paper clip to see which can attract the paper clip from a greater distance.(option A)

What is an electromagnet?

A coil surrounding a magnetic core through which an electric current is delivered to magnetize the core is what makes up an electromagnet. Wherever controlled magnets are needed, such as in devices where the magnetic flux needs to be adjusted, reversed, or turned on and off, an electromagnet is utilized.

The magnetic field has also been thought to be completely contained inside the coil. In actuality, the magnetic lines of force that surround the exterior of the coil, which represent the leakage flux, are constantly present and do not add to the core's magnetization.

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The question was incomplete. Check below the full question.

Jaeda designs two electromagnets of different strengths. the first electromagnet has an insulated copper wire wrapped around an iron nail many times before it is connected to a battery. the second electromagnet has its insulated copper wire wrapped around a similar nail a fewer number of times before it is connected to two smaller batteries jaeda tries to determine which electromagnet is stronger by bringing each near a bowl containing eight metal paper clips. she observes that both electromagnets attract all eight of the paper clips how can jaeda demonstrate that each electromagnet has a different strength?

A. Place a metal paper clip on a table and slowly bring each electromagnet closer to the paper clip to see which can attract the paper clip from a greater distance.

B. Determine which electromagnet has its copper wire wrapped around its iron nail a greater number of times.

C. Add plastic paper clips to the bowl and check which electromagnet can attract both kinds of paper clips.

D. Reduce the number of paper clips in the bowl and find which electromagnet attracts more paper clips.

Answer: Breakdown Lanes

Reason: With breakdown lanes when a car needs to stop it can go to the backdown lane and fix its issue.

(a) The rate of entropy generation for throttling valveThe rate of entropy generation for throttling valve can be expressed as:ΔS = H1/T1 - H2/T2 = Hf1/T1 - Hf2/T2whereHf1 = enthalpy of saturated liquid propane at 18 barHf2 = enthalpy of saturated liquid-vapor mixture of propane at 4 ∘C and18 bar (at State 2)T1 = temperature at state 1T2 = temperature at state 2At state 1, saturated liquid propane is given.

Using the steam table, we can find the enthalpy at 18 bar to be 327.32 kJ/kg.At state 2, the vapor quality is not given. But, the data of the saturated liquid-vapor mixture can be used. Therefore, at state 2, enthalpy is 225.68 kJ/kg. (From the saturated liquid-vapor mixture data for propane at 4 ∘C and18 bar, hf = 225.68 kJ/kg and hg = 435.34 kJ/kg)T1 = 35+273 = 308 K and T2 = 4+273 = 277 KΔS = 327.32/308 - 225.68/277 = 0.415 kW/K(b) The rate of entropy generation for the heat exchangerThe rate of entropy generation for the heat exchanger can be expressed as:ΔS = Q/TlWhereQ = Rate of heat transfer= 10 kW= Rate of heat transfer/Tl=10/(277 − 293)ΔS = -0.540 kW/K(c) The rate of entropy generation for the compressor

The rate of entropy generation for the compressor can be expressed as:ΔS = H4/T4 - H3/T3= Hg4/T4 - Hf3/T3whereHg4 = enthalpy of propane leaving the insulated compressor at 18 bar and 60 ∘C (State 4)Hf3 = enthalpy of saturated liquid-vapor mixture of propane at 4 ∘C and 18 bar (State 3)T3 = T2 = 277 K and T4 = 60+273 = 333 KUsing steam tableHg4 = 481.43 kJ/kg and Hf3 = 225.68 kJ/kgΔS = 481.43/333 - 225.68/277= 2.247 kW/K(d) Propane on T−s diagram relative to the vapor dome and the appropriate lines of constant pressure for the four statesThe T-s diagram of propane is shown below:img

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Answer:

by hìuuf5ëcz

Explanation:

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The Safety Data Sheets are designed to make it easier for employees to get health and safety information about chemicals (Option A). They are fundamental for handling hazardous chemicals.

Safety Data Sheets are pieces of useful information developed by a manufacturer of a hazardous chemical.

These sheets (safety data sheets) include different types of data including, among others, chemical properties; physical hazards, environmental hazards, etc.

Safety data sheets also include different measures for the safety and protection of overall health, which is often related to issues such as, for example, how to store and/or transport the target chemical.

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Answer:

False

Explanation:

Answer:

The main reason for bridges collapses is: earthquakes (natural disasters) and construction incidents. Whenever a natural disaster occur, it makes the bridge collapse. An example is hurricanes. Hurricanes come with a great wind and that might lead to the bridge collapsing. Construction incidents means the bridge falls during construction. Those who are employed in health, safety and environmental management need to make sure that during the construction, they have examined the material and made sure it is strong. Working with economists, they should seek better understanding of the methods for minimizing the costs during the life of the bridge. In case for natural disasters, like flooding, they should make the bridge in a lever where the water won't reach the bridge. And they should have a limit for weight in the bridges because that is another reason it collapses, because the bridge does not support extra weight.

Explanation:

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