why does polishing the surface of a metal extend fatigue life

Answer:

I’m so sorry I tried solving it but I don’t understand it can you explain the question a little bit more ty

Explanation:

Answer:

its A

Explanation:

I just did it :)

She will hear 442.57 beats per second, if she plays the note with the same tuning fork and the speed of sound is 344 m/s.

Initial speed of sound in the flute, v₁ = 342 m/s

Speed after increasing the temperature inside the flute, v₂ = 344 m/s

Frequency of the note of the tuning fork, f₁ = 440 hz or 440 per secs

Let the wavelength of the sound wave, = λ

Let the frequency after increasing the temperature, = f₂

We know the relationship, speed = wavelength(λ) × frequency

342 = λ × 440

λ = 342/440

λ = 0.777 m

When the speed is increased to 344 m/s,

344 = 0.777 × f₂

f₂ = 344/0.777

f₂ = 442.57

So, she will hear 442.57 beats per second.

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Among the reasons for the frequent use of composite measures is that they give a more comprehensive and accurate indication of a given variable. Besides, the researcher is seldom able to develop in advance single indicators of complex concepts. A single data item might not have enough categories to provide a range of variation. And lastly, they are efficient data reduction devices.

So, the correct answer is option (e) all of these choices.

Composite measures are used to combine several variables or scores into a single measurement or index. In other words, they are multidimensional measurement tools. It is useful to make this kind of index because it is possible to calculate the reliability and validity of composite measures, which are statistical measures that indicate whether or not the measurements were conducted accurately or are otherwise legitimate.

For example, if a researcher wants to assess the economic development of a country, he/she could create a composite measure by combining data on GDP per capita, literacy rates, and poverty rates. In this case, each of the three variables reflects a different aspect of economic development.

So, the correct answer is E.

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The electric potential energy of a system of two point charges is inversely proportional of the distance between the two charges.

Electric potential energy is a implicit energy( measured in joules) that results from conservative Coulomb forces and is associated with the configuration of a particular set of point charges within a defined system. An object may be said to have electric implicit energy by virtue of either its own electric charge or its relative position to other electrically charged objects.

The term" electric implicit energy" is used to describe the implicit energy in systems with time- variant electric fields, while the term" electrostatic implicit energy" is used to describe the implicit energy in systems with time- steady electric fields.

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The odd number of 0.24 calories corresponds to the mechanical energy of 1 kg·meter^2/sec^2, and it is a result of the relationship established by James Prescott Joule's experiments on the mechanical equivalent of heat.

The reason that 1 kg·meter^2/sec^2 is equal to approximately 0.24 calories is due to the relationship between energy and work. This equivalence arises from the conversion factor between the units of energy used in the International System of Units (SI) and the units of energy commonly used in the field of thermodynamics.

James Prescott Joule, a British physicist, made significant contributions to the understanding of energy conversion and the relationship between mechanical work and heat. In the mid-19th century, Joule conducted experiments to establish the mechanical equivalent of heat, which showed that mechanical work could be converted into heat energy and vice versa.

Joule's most famous experiment involved the measurement of the mechanical work done by stirring paddles in water, which caused an increase in temperature. By carefully measuring the work done and the corresponding increase in temperature, Joule was able to determine the relationship between mechanical work and heat.

Through his experiments, Joule established that a certain amount of mechanical work is equivalent to a specific amount of heat energy. He determined that 1 calorie of heat energy is equivalent to approximately 4.184 joules of mechanical work. This relationship is known as the mechanical equivalent of heat and is fundamental to the understanding of energy conversion.

To connect this to the conversion factor mentioned earlier, 1 calorie is defined as the amount of heat energy required to raise the temperature of 1 gram of water by 1 degree Celsius. Since 1 calorie is equivalent to approximately 4.184 joules, we can make the conversion:

1 kg·meter^2/sec^2 = 1 joule = (1/4.184) calories ≈ 0.24 calories

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The quantity of matter in a fluid or an object is measured by its mass. The kilogram (kg) is the SI unit of mass, while lower masses can also be defined in grams (g). A balance is what you would use to gauge mass.

The Internacional Numbering Systems, often known as the Units of Measurement (si) and sometimes SI in all language families, has become the most widely used system of measurement in the world. It is the most recent metric measurement system.

We require the Transnational System of Units in order to keep numbers in use on a global scale comparable and consistent. Standardizing such measurements supports society's confidence in data by preserving uniformity and precision.

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The work done in pumping all the liquid out of the tank is 2500π lb-ft.

The potential energy of an object is given by the formula:

PE = mgh

Given:

Density of oil = 50 lb/ft^3

Diameter of the tank = 10 ft ( r = 5 ft)

To calculate the work done, we need to find the mass of the oil and the height it is lifted. Let's start by finding the mass:

Volume of oil in the tank:

The volume of a hemisphere = (2/3) * π * (r^3)

Volume = (2/3) * π * (5^3) = (2/3) * π * 125 = 250π/3 ft^3

Mass of the oil:

Mass = Volume * Density = (250π/3) * 50 lb

Now, we need to find the height of the tank. For a hemisphere, the height is equal to the radius (5 ft).

Finally, we can calculate the work done:

Work = PE = mgh = (250π/3) * 50 lb * 5 ft

Work = (250π/3) * 50 * 5 lb-ft

       = 2500π lb-ft

So, the work done in pumping all the liquid out of the tank is approximately 2500π lb-ft.

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The ratio of maximum intensity to minimum intensity is 6561:1.

The intensity of the two coherent sources is in the ratio 81:1.

Hence, let the intensities of the two sources be I1 and I2, respectively.

Since the intensity is proportional to the square of the amplitude, we have

                                      \($I_1 :I_2 = 9^2 : 1^2$\)

                                                   \($= 81 : 1$\)

Therefore, the amplitude ratio is 9:1

Let the amplitude of the weaker source be A, then the amplitude of the stronger source will be 9A.

The interference fringes will occur when the path difference between the two waves is an integral multiple of their wavelengths.

Let the path difference be λ, 2λ, 3λ, . . . etc.

The intensity at a point on the screen due to the two waves is given by

                               \(I $= I_1 + I_2 + 2\sqrt {I_1 I_2} \cos \frac{{2\pi }}{\lambda }x$\)

On substituting the values, we have

                              \($I = A^2 [1 + 81 + 2 \times 9\cos (2πx/λ)]$\)

                                \($= 82A^2[1 + 1/9\cos (2πx/λ)]$\)

The maximum value of I occurs when cos(2πx/λ) = 1 and is therefore, 82A2.

The minimum value of I occurs when cos(2πx/λ) = −1/9 and is therefore, 82/81A2.

The ratio of maximum intensity to minimum intensity is:

         \($$\frac{{{\text{Maximum}}\,{\text{intensity}}}}{{{\text{Minimum}}\,{\text{intensity}}}} = \frac{{82{A^2}}}{{82/81{A^2}}}\)

                                                                                                                                               \(= {81^2}:1$$\)

Thus, the ratio of maximum intensity to minimum intensity is 6561:1.

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Without any additional information about Mystery A, it is difficult to determine the exact properties of the wave it emits. However, based on the properties of air, we can make an educated guess about the wavelength of Mystery A's wave.

In general, the speed of light is slower in air than it is in a vacuum. This means that the wavelength of a wave passing through air will be slightly shorter than the wavelength of the same wave in a vacuum. This phenomenon is known as refraction.

However, the exact amount by which the wavelength is affected depends on the properties of both the material through which the wave is passing and the wave itself. Some waves may be more affected by refraction than others, so it is impossible to say for certain whether the wavelength of Mystery A's wave will be longer, shorter, or the same as in air without more information about the wave itself.

In addition to refraction, there are other factors that could affect the wavelength of a wave in air, such as interference or diffraction. Interference occurs when two waves interact with each other, either amplifying or cancelling each other out. Diffraction occurs when waves bend around objects in their path, causing the wavefronts to spread out. Both of these phenomena can affect the wavelength of a wave passing through air.

In conclusion, while it is difficult to determine the exact wavelength of Mystery A's wave without additional information, we can make an educated guess based on the properties of air. Refraction, interference, and diffraction are all factors that could affect the wavelength of the wave in air, so the answer could be longer, shorter, or the same depending on the specific properties of the wave and the medium through which it is passing.

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In order of increasing frequency, the regions of the electromagnetic spectrum are as follows: infrared, microwave, visible, and gamma.

Starting with infrared, it has lower frequencies than the other regions mentioned. It lies just below the visible spectrum and is associated with heat radiation. Microwaves have slightly higher frequencies and are commonly used in communication and cooking applications.

Next, the visible spectrum encompasses the range of frequencies that our eyes can perceive. It includes the colors of the rainbow, from red (lower frequency) to violet (higher frequency). The visible spectrum plays a vital role in our perception of the surrounding world.

Finally, gamma rays have the highest frequencies in the list. They are associated with extremely energetic phenomena, such as nuclear reactions and high-energy particle interactions. Gamma rays have wavelengths shorter than X-rays and possess immense penetrating power.

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When rising from a chair or getting up from the floor, the human body moves primarily in the sagittal plane around the mediolateral axis. The plane of motion are different types like Transverse Plane, Frontal Plane and Sagittal Plane.The movement primarily occurs along the mediolateral axis, which runs from side to side.

The human body moves in three planes of motion: sagittal, frontal, and transverse. The sagittal plane divides the body into left and right halves, the frontal plane divides it into front and back halves, and the transverse plane divides it into upper and lower halves.

When rising from a chair or getting up from the floor, the predominant movement occurs in the sagittal plane. This is because the main action involves flexing the hip and knee joints to lift the body upward. The movement primarily occurs along the mediolateral axis, which runs from side to side.


To summarize, when rising from a chair or getting up from the floor, the human body moves in the sagittal plane around the mediolateral axis. This movement involves flexing the hip and knee joints to lift the body upward.
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The current passing through a circuit if it takes 1 minute for 45C of charge to pass a point is 0.75A.

HOW TO CALCULATE CHARGE:

Where;

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The heat anticipator in a thermostat prevents the temperature in the conditioned space from rising above the thermostat setting. This statement is false.

A thermostat is a temperature-regulating device that maintains a constant temperature in a heating and cooling system. When the temperature reaches a certain level, the thermostat causes the system to turn on or off. It is an important part of an HVAC system since it helps maintain the temperature within a room or building.

The thermostat's heat anticipator is an electrical device that determines when to shut off the heating or cooling system before the set temperature is reached. It accomplishes this by adding a small amount of resistance to the thermostat's circuit, which results in a little current flowing through the heating element of the thermostat.

It reduces overshooting by turning off the heating or cooling system before it reaches the set temperature, ensuring that the space temperature does not go beyond the thermostat setting. So, in conclusion, the correct explanation is false because the heat anticipator helps to maintain the temperature from overshooting the thermostat setting.

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The name of the substance is silver based on the specific heat capacity value.

The specific heat capacity of the substance is calculated by applying the following formula for heat capacity.

Q = mcΔθ

where;

c = Q / mΔθ

The specific heat capacity of the substance is calculated as;

c = (5875 J ) / ( 500 g x 50 )

c = 0.235 J/kgK

The substance that has the same specific heat capacity calculated above is silver.

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Given

Mass of one of the object is doubled and the distance between the object is doubled.

To find

What happens to the gravitational force

Explanation

The gravitational force is directly proportional to the masses and inversely proportional to the distance between them

Keeping all other parameters constant,

So when the mass doubles and the distance doubles we have,

Conclusion

A. The gravitational force becomes half as great.

The term that describes speed is a scalar quantity. The correct answer is option OB.

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The correct question would be as

Which phrase describes speed?

OA. A quantity with direction only

OB. A scalar quantity

OC. A quantity with no units

OD. A vector quantity

Answer:

EK = 440 Joule

Explanation:

Known:

m = 55 kg

v = 4 m/s

Ek = ?

Equation to solve this is:

Ek = 1/2 m \(v^{2}\)

Ek = 1/2 . (55) . \((4)^{2}\)

Ek = 440 J

We will have that kinetic energy is different from potential energy as follows:

Kinetic energy is energy of a moving object, whereas potential energy is energy possessed by matter as a result of its location or structure. [Option C]

Electromagnetic waves consists of alternate electrical and magnetic fields.

Light is a electromagnetic wave. Hence in light wave, electrical and magnetic fields vibrate.

(a) A = B × r is a vector potential for B, where r = {x, y, 0}.

(b) The flux through a surface S can be calculated as Φ = ∫B·dA, where B is the magnetic field and dA is an infinitesimal area vector perpendicular to the surface.

(a) To verify that A = B × r is a vector potential for B, we need to show that ∇ × A = B.

Using the cross product property, we have ∇ × A = ∇ × (B × r). Applying the vector identity (A × B) × C = B(A · C) - C(A · B), we get ∇ × (B × r) = B(∇ · r) - r(∇ · B).

Since ∇ · r = 0 (as r = {x, y, 0}), and ∇ · B = 0 (as B has a constant magnitude in the z-direction), we find that ∇ × A = B, verifying A = B × r as the vector potential for B.

(b) The flux through a surface S can be calculated as Φ = ∫B·dA, where B is the magnetic field and dA is an infinitesimal area vector perpendicular to the surface.

Given that B has a constant strength b teslas in the z-direction, the flux through surface S will be Φ = ∫B·dA = ∫(0, 0, b) · (dxdy) = b∫dxdy = bA, where A is the area of the surface S.

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Answer:

6.37 x 10⁷Hz

Explanation:

Given parameters:

Wavelength = 4.71m

Unknown:

Frequency  = ?

Solution:

To solve this problem, we use the expression below:

           V = F∧  

V is the velocity  = 3 x 10⁸m/s

F is the frequency

∧ is the wavelength

  3 x 10⁸  = F x 4.71

      F  = 63694267.52Hz = 6.37 x 10⁷Hz

The force being applied to the rope is 43.78 Newtons.

To find the force being applied to the rope, you can use the formula:

F = ma

where,

F is the force, m is the mass of the sled, and a is the acceleration of the sled. Since the sled is moving at a constant velocity, the acceleration is 0.

The force being applied to the sled by the rope can be broken down into two components:

The horizontal component is the force being applied to the sled in the direction it is moving, and the vertical component is the force being applied to the sled in the direction perpendicular to the direction it is moving.

Apply trigonometry to find the horizontal and vertical components of the force being applied to the sled. The horizontal component is the force being applied to the sled in the direction it is moving, and the vertical component is the force being applied to the sled in the direction perpendicular to the direction it is moving.

So, the horizontal component of the force being applied to the sled is 85 * cos(25) = 72.67 Newtons. The vertical component of the force being applied to the sled is 85 * sin(25) = 42.78 Newtons.

Since the friction of the snow on the sled provides a force of 85 Newtons in the opposite direction of the direction the sled is moving, the total horizontal force being applied to the sled is 72.67 - 85 = -12.33 Newtons. This means that the force being applied to the rope in the direction it is being pulled is 12.33 Newtons.

The total vertical force being applied to the sled is 42.78 - 0 = 42.78 Newtons. This means that the force being applied to the rope in the direction perpendicular to the direction it is being pulled is 42.78 Newtons.

So, the total force being applied to the rope is the square root of the sum of the squares of the horizontal and vertical components of the force. This is equal to the square root of (12.33^2 + 42.78^2) = 43.78 Newtons.

Therefore, the correct answer is as given above

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Answer:

the correct answer is jupiter

Answer:

planet Jupiter

Explanation:

Most of the extrasolar planets that have been discovered are most like the planet Jupiter in our solar system

The average distance of the planet from the sun is approximately 116 million kilometers in terms of Earth distance.

To calculate the average distance of a planet from the sun in terms of Earth distance, we can use Kepler's third law of planetary motion:

(T/TE)^2 = (r/rE)^3

Here, T is the orbital period of the planet, TE is the orbital period of Earth, r is the average distance of the planet from the sun, and rE is the average distance of Earth from the sun.

Given that the orbital period of the planet is T = 0.421 years and the orbital period of Earth is TE = 1 year, we can solve for r:

(r/rE) = (T/TE)^(2/3) = (0.421/1)^^(2/3) ≈ 0.773

Therefore, the average distance of the planet from the sun is about 0.773 times that of Earth's distance from the sun.

The average distance of Earth from the sun is about 150 million kilometers (km), or 93 million miles. Therefore, we can calculate the average distance of the planet from the sun as:

r = 0.773 x 150 million km ≈ 116 million km

Therefore, the average distance of the planet from the sun is approximately 116 million kilometers in terms of Earth distance.

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Answer:

c

Explanation:

Answer:

Areas where earth crust experiences a high amount of stress

Explanation:

FCAT review question

Answer:

The pulling force that acts along a stretched flexible connector, such as a rope or cable, is called tension, T. When a rope supports the weight of an object that is at rest, the tension in the rope is equal to the weight of the object: T = mg.

Explanation:

Hund's rule allows us to find that the number of combined mismatched electrons is 12

Hund's rule is which configuration has the lowest energy in a system, so this must be met

In this case the number of sublevel of the  d orbital where they fit

           # sublevels = 2 d + 1

           # sublevels = 2 2 +1

           # sublevels = 5

Each sublevel fits two electrons according to the Pauli principle, which establishes that all quantum numbers in a novel cannot be the same.

Let's distribute the electrons at each level

level        electrons

3d             ½ ½ ½

4d          ½ ½ ½ ½

5d      ½ ½ ½ ½ ½

Where there is a single electron in each sublevel according to Hund's principle

In conclusion using Hund's rule we can find that the number of combined unpacked electrons is 12

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Answer:15

Explanation: I have the same college class is based on hunds rule