in alternating current, how often does the current alternate between negative and positive?

Answers

Answer 1

Answer:

AC voltages alternate/cycle, at a rate of 60 times each second.

Answer 2
In an alternating current (AC) circuit the two poles alternate between negative and positive and the direction of the current (electron flow) reverses periodically.

Related Questions

In which cases should you wear gloves?

Answers

Los guantes son un tipo de equipo de protección personal (EPP). Otros tipos de EPP son las batas, mascarillas y cubiertas para los zapatos y la cabeza.

Usar guantes puede generar una sensación de aparente seguridad, sin embargo, la Organización Mundial de la Salud (OMS) no recomienda su uso

2. A used car needs a wheel alignment. Which --
technician would usually complete this operation?
(A) Engine technician.
B) Steering and suspension technician.
(C) Wheel technician.
(D) Brake technician.

Answers

Answer:

B

Explanation:

This is because that steering and suspension technician has a prior knowledge of stunting when driving and know s the surface to volume ratio of the car

What is the area on a machine where work is actually being performed and material is being processed?

Answers

Answer:

Point of operation

OSHA’s Code of Federal Regulations 1910.212 General Requirements For All Machines states that “Point of operation is the area of a machine where work is actually performed upon the material being processed. The point of operation of machines whose operation exposes an employee to injury, shall be guarded.”

Explanation:

The area on a machine where work is actually being performed and material is being processed is known as the Point of Operation.

What is the importance of machines?

The importance of machines is understood by the fact that they help to make the work of individuals better, and faster, reduce workload, and make their life easier and more comfortable.

According to the context of this question, the point of operation of machines may be determined by the fact whose operation exposes an employee to injury shall be shielded. This point of operation is considerably be opted in order to make the work of employees more functional with respect to ideas.

Therefore, the Point of operation is the area on a machine where work is actually performed upon the material being processed.

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9. Technician A says pneumatic tools can be permanently or temporarily attached to the air compressor. Technician B says the three main parts of an air compressor are the motor, drain valve, and drain tube. Who is correct?

Answers

Answer:

Technician B

Explanation:

This is because the motor is used to generate energy for the compression process and the drain valve controls the inflow of air in and out of the compressor and the tube is the passage for the air

Physical properties of minerals

Answers

Most minerals can be characterized and classified by their unique physical properties: hardness, luster, color, streak, specific gravity, cleavage, fracture, and tenacity.

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All minerals can be characterized and classified by their unique physical properties: hardness, luster, color, streak, specific gravity, cleavage, fracture, and tenacity.

which is the best tool to use to mark a straight line 20 feet long on a floor?

Answers

Answer:

quadrant

Explanation:

since it is on the floor

what is the difference between agitator and impeller

Answers

Ans: Washing machines with agitators use a central post that twists back and forth, rubbing against clothes to help break apart stains. In contrast, washing machines with impellers use a low-profile cone or disc that spins/rotates to rub clothes against each other to get them clean.

What is the general equation for calculating sensible heat change of fluids?​

Answers

Answer:

The phase shift between the solid, liquid and gas is relevant to the latent heat. The sensible heat formula is used to calculate the flow of air in the electric furnace. The sensible heat formula with a change in temperature is expressed as Q sensible= 1.10 x cfm x (to – ti)

Explanation:

What’s the most important benefit of maintaining a neutral posture

Answers

Neutral posture is essential for optimal wellbeing and functioning of the body. Holding the weight of the body The most important function of a neutral posture is to maintain the body in an upright position, supporting the body against gravity

Select the correct answer.
Which projection shows a three-dimensional representation of an object?
OA.
orthographic projection
B.
section projection
OC.
perspective projection
O D.
exploded projection
Reset
Next

Answers

Orthographic projection, common method of representing three-dimensional objects, usually by three two-dimensional drawings in each of which the object is viewed along parallel lines that are perpendicular to the plane of the drawling.

Answer:

The correct answer is C. Perspective Projection

Explanation:

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Technician a says that if the exhaust has a bluish tint, it indicates that engine is burning coolant. Tech b says that blackish exhaust indicates a rich fuel mixture

Answers

im sorry but the first half is incorrect bro if your exhaust is a bluish tint it means your burning oil and its coming in the form of blowby in worn piston rings or oil seaping through the heads from the valves due to a blown head gasket or cracked cylinder head or block

The
-- procedure involves surveying, measuring, and counting all
materials indicated on a set of drawings. Fill in the blank.
?
Submit answer
Next

Answers

Answer:

Quantity Takeoff

Explanation:

Which is an example of potential energy?

A moving car

a parked car

fan on high setting

a person running

Answers

Answer:

A moving car

Explanation:

It uses energy GAS to power it and it is energy

1. Define “continuous probability distribution” and cite at least 5 types.

2. Define expected value and variance of a continuous random variable.

3. Describe normal distribution and the process of solving probability problems involving normal distribution.

4. Explain normal approximation to binomial distribution and how it is used in solving probability problems.​

Answers

Continuous variables are variables such as time, pressure, height, length, temperature and weight

The responses are;

1. Continuous probability distribution is a distribution in which the values of

the random variable X is not limited to certain values, and therefore the

values are not countable

Five types of continuous random variable are;

Normal distributionStudent t-distributionChi-square distributionF-distributionChi-square distribution

Others include

Gamma distributionBeta distributionCauchy distribution

2. The expected value of a continuous random variable, X, is defined as follows;

[tex]\displaystyle The \ expected \ value, \ E[X] = \int\limits^{\infty}_{-\infty} {x \cdot f(x)} \, dx[/tex]

3. The normal distribution the usual distribution used for variables that are

randomly generated and independent. It is a continuous probability

distribution also referred to as Gaussian distribution

The shape of the graph the normal distribution is bell shaped with the

maximum point being the average or mean value, while the standard

deviation gives the dispersion from the mean

The process of solving probability problems involving normal distributions

includes;

Define the value of the probability required in the following form;      p(x < a), p(x > b), p(a < x < b)

The z-score of a, (and b) is then determined as follows;

[tex]Z=\dfrac{a-\mu }{\sigma }[/tex], and/or [tex]Z=\dfrac{b-\mu }{\sigma }[/tex]From the z-score obtained above, the value of the probability p(x < a), can be obtained from the Z-tableThe value of p(x > a) = 1 - p(x < a)The value of p(a < x < b) is the difference between p(x < a) and p(x > b), the larger first, to get a positive value

4. The normal approximation to the binomial distribution is the use of the

normal (continuous) distribution to approximate the binomial (discrete)

distribution

Using the approximation, we have;

The mean = n·p

The standard deviation, [tex]\sigma = \sqrt{(n \cdot p \cdot (1 - p))}[/tex]

Where;

n = The sample size;

p = The probability value given

With the calculated mean and standard deviation, the z-score and

probability p(x < a), can be found for a particular value, a, using the steps

for solving probability problems involving normal distribution

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What is placed as the first step in the scientific method?

Answers

Make objective observations.

Whenever scientists do any study they first observe the thing.We can have the example of coronavirus, The scientists first observed the virus then they might of done some changes in the virus.

The material that is used to make the helmets and hand shields must be an:

Answers

Ans: Helmets and hand shields shall be made of a material which is an insulator for heat and electricity. Helmets, shields and goggles shall be not readily flammable and shall be capable of withstanding sterilization.

The material that is used to make the helmets and hand shields must be an insulator. The correct option is b.

What is an insulator?

An insulator is any substance that prevents energy—such as electricity, heat, or cold—from moving through it easily. Good insulators include glass, plastic, rubber, and wood.

Insulators are substances that prevent electricity from passing through them. Insulators are employed as a defence against the potentially harmful effects of electricity because they oppose electric current. Glass, air, wood, plastic, and rubber are a few examples of insulators.

A material that is an insulator for heat and electricity must be used to make helmets and hand shields. Helmets, shields, and eye protection must not easily catch fire and be sterile-resistant.

Thus, the correct option is b.

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Your question seems incomplete, the missing options are:

- Conductor

- Insulator

- Both a and b

engineering controls are devices such as self sheathing needles and sharps containers to block or eliminate the sharp risk. true or false?

Answers

Answer:

yes

Explanation:

The 1991 standard states, "engineering and work practice controls shall be used to eliminate or minimize employee exposure." The revision defines Engineering Controls as "controls (e.g., sharps disposal containers, self-sheathing needles, safer medical devices, such as sharps with engineered sharps injury protections ...

Engineering controls are the devices such as self sheathing needles and sharps containers that are used to block or eliminate the sharp risk. Therefore, the statement is true.

It should be noted that the aim of engineering and work practice controls is to minimize employee exposure to blood pathogens.

Some of the physical means that can be used to isolate the hazards such as self-sheating needles and sharps disposal are referred to as engineering controls.

In conclusion, the correct option is true.

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What is being measured in this experiment?

Answers

Answer:

A dependent variable is what you measure in the experiment and what is affected during the experiment. The dependent variable responds to the independent variable. It is called dependent because it "depends" on the independent variable.

in which year did the industrial revolution begin in england with the invention of the steam engine?

Answers

Answer:

1698

Explanation:

The year the industrial revolution begin in England with the invention of the steam engine was 1760.

The Invention of steam engine in England.

James Watt, another Scottish engineer, played a crucial role in improving the efficiency of the steam engine. In the late 18th century, Watt made significant modifications to the design, including the addition of a separate condenser and a governor to regulate steam flow. These improvements made the steam engine much more efficient and practical for a wide range of applications beyond mining, such as powering factories and locomotives.

Watt's improvements, combined with subsequent innovations by other engineers, helped usher in the Industrial Revolution, which transformed England and eventually the world. The steam engine became a fundamental technology for powering machinery, revolutionizing transportation, and driving economic growth.

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Tech A says that when turning a corner,both wheels being steered remain parallel to each other as the wheels are steered.Tech B says that on some vehicles, the rear wheels also can be steered. Who is correct?

Answers

both technicians are correct. There are some older cars that have rear steering available. As for the front wheels, which all cars have front steering. The front wheels will always be parallel.

¿Qué impactos genera el proceso de la transformación de la caña de azúcar en diversos productos tales como azúcar, alcohol, alimentación animal entre otros?

Answers

Answer: The environmental impacts of agricultural activities are, in general, slight, quite dependent on little controllable factors (rains, temperatures, ...

Explanation:

Which image represents a disadvantage of living near the sea?

Three men carrying nets into the sea.

An outrigger sitting on the sand.

A house that has collapsed into the sea.

Answers

Answer:

Hey mate....

Explanation:

This is ur answer....

• A house that has collapsed into the sea.

(Because this is the only sentence that sounds DANGEROUS!)

Hope it helps!

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Follow me! ◇

Answer: C) A house that has collapsed into the sea.

Explanation:

qué pasaría si todas las personas en este país tuvieran derechos pero no obligaciones?

Answers

No podríamos ser ordenados

Answer:

el país se volvería corrupto

Explanation:

A device that transforms electrical energy to mechanical:

Answers

Answer:

electric motor

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Explanation:

Which of the following describes the maximum peak of a wave?

Answers

Answer:

Explanation: Peak – the highest point above the rest position. Trough – the lowest point below the rest position. Amplitude – the maximum displacement of a point of a wave from its rest position. Wavelength – distance covered by a full cycle of the wave. Usually measured from peak to peak, or trough to trough.

 

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Technician A states that the SRS systems help to provide a level of accident avoidance. Technician B states that the SRS system helps to cushion the passengers in case of an accident. Who is correct?

Answers

The supplemental restraint system is automatically deployed in cases of collison on other increase passenger safety. Hence, Technician B is right.

The supplement restraint system is a presssure filled airbag which automatically inflates and slowly deflates whenever there is a collision worthy of deployment.

These cushions the effect of the collison on the passenger as it acts as barrier between the passenger and the object which the passenger's body could hit during collison.

Therefore, the SRS acts to cushion the effect of injuries during accident and does not prevent accident.

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which of the following companies is the easiest type to set up​

Answers

Answer:

gogle    hi

Explanation:

Hellooooo my bradyn c pitre on detressssssss

Answers

Answer:

hello what you want

Explanation:

which symbol would alert you that the air pressure in a tire is outside the manufacturer recommend psi?

Answers

Answer:

Explanation:

J is between H and K. If HJ=6x-5, JK=4x-6 and KH= 129, find the value of HJ

The sign that shows that the air pressure is outside the manufacturer recommend psi is a cup with an exclamation mark.

What is a tire?

A tire is a device that serves the purpose of moving an automobile. It serves as the legs of a vehicle. A tire is always filled with air and the air pressure must always be within the manufacturer recommend psi.

The sign that shows that the air pressure is outside the manufacturer recommend psi is a cup with an exclamation mark.

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Individual/organizations who are responsible for monitoring, verifying, and sometimes certifying various aspects of the construction process including verifying that the regulations are being followed. These individuals are usually independent of the General Contractor.

Answers

The project or the site manager is responsible for monitoring or verifying the aspects of the construction process.

The site or the project manager is the individual that is responsible for the adherence to quality and guidance on the construction site.

The site or project manager has the following tasks

ensuring safety on the siteMonitoring the progress or the work that is being doneSourcing materialsSolving problems

In conclusion, the project manager monitors and verifies aspects of the construction process.

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Unlike Plato, Aristotle believed in: How did the French and Indian War lead to tensions between England and itscolonies?A. The colonists began charging England higher prices for warmaterials.B. England refused to protect the colonists in future wars.C. England began taxing the colonists to pay for the cost of the war.D. The colonists refused to buy manufactured goods from England,SUBMIT Please solve the math problem... I will mark you brainliest A 15 year mortgage at 8.5 percent for $275,000 HELLLLLLLLLLLLLLP MEEEEEEEEEEEE Which statement best defines an interest group? an organization that conducts research on a common topic a group that is organized to perform community service a group within the government that works on a common topic of interest an organization that tries to influence policies because of a common concern Solve.2(y + 7) = 28Answer: Read the sentence from the section "InteractingWith Light."There are three different types of conesin the eye which each detect awavelength of light: red, green or blue.Which word, if it replaced the word "detect" in thesentence above, would CHANGE the meaning ofthe sentence?AhideBseerecognizeDsense if a person wanted to learn more about the genetic material of plant and animal cells, where would they look? Answer questions 5 to 8 using the present tense. How many children died in the first few months of the exile of south Dakota ZWhat is m 2?y+What is m 1?1413 162/3>14 155759126710 11w What is the answer to 0.2 10 Which Resources are found in Brazil's Rain Forest?Choose all answers that apply! :)A. WheatB. NutsC. RubberD. Medical Plants the temperature changed from 5 degrees Celsius 6pm to -2 degrees Celsius at midnight. How much did the temperature decrease? Data for length of the tail (in millimeters) and age (in days) of tadpoles is entered into a statistics software package and results in a regression equation of = 15 - 1.5x.What is the correct interpretation of the slope if the length of the tail is the response variable and the age is the explanatory variable? Evaluate the expression when m=6m-5m-4 Un perro de rescate parte del campamento en bsqueda de una persona extraviada. Se desplaza 3 km al Este, 2.5 km al Norte, 3.5 km al Suroeste y 2 km al Sur, siguiendo la ruta del caminante. A qu distancia y en cul direccin a partir del campamento se encontraba la persona perdida? the difference between hornfels and soapstone is that 1. I am seven letters long.2. My 1, 2, and 3 will keep you warm.3. Without 1, 2, and 4, it really hurts.4. My 1, 5, and 7 are a positive verb.5. Put all my letters together and I givethe orders.What am I?