why are spectral lines useful in classifying stars?(1 point) they indicate a star's age. they indicate a star's age. they show the composition of a star. they show the composition of a star. they show a star's location. they show a star's location. they show the layers that make up a star.

Answer:

90,000 meters

Explanation:

75*1200 = 90,000

Answer:

Antibody molecules that are secreted by plasma cells mediate the humoral immune response. The antigen that binds to the receptor of the B-cell antigen signals B cells and is internalized and transformed into peptides that activate the armed helper at the same time.

Explanation:

Answer:

B cells

Explanation:

Humoral immunity or humoural immunity is the aspect of immunity that is mediated by macromolecules found in extracellular fluids such as secreted antibodies, complement proteins, and certain antimicrobial peptides. Humoral immunity is named so because it involves substances found in the humors, or body fluids. It contrasts with cell-mediated immunity. Humoral immunity is also referred to as antibody-mediated immunity.

Answer:

D: D= m/v

Explanation:

That is the right formula. I like to remember that finding density takes a lot of HEART because it is shaped like a heart

They can travel through matter and through space.

Electromagnetic radiation is one of the many ways that energy travels through space. The heat from a burning fire, the light from the sun, the X-rays used by your doctor, as well as the energy used to cook food in a microwave are all forms of electromagnetic radiation.

While these forms of energy might seem quite different from one another, they are related in that they all exhibit wavelike properties.

The electromagnetic spectrum is a taxonomy of electromagnetic waves that groups them according to their varied wavelengths and frequencies. 

Therefore, They can travel through matter and through space.

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well, you get some DNA from both of your parents, so when you hear the phrase, "You have your mother's eyes!" That means you have some of your mother's DNA that gave you her eye color. The DNA you get from your parents help determine how you look today

The spring constant for a spring that can store 25J of elastic potential energy when compressed by 7.5 cm is 8.9*10³ N/m.

given,

 energy stored in the  spring = E = 25J

compressed  distance = x = 7.5cm = 0.075m

  E = 1/2 * kx²

  K = 2E/x²

     = 8.9*10³ N/m

The energy that an item retains due to its position in relation to other objects, internal tensions, electric charge, or other reasons is known as potential energy in physics.

Potential energy can take many different forms. Some examples are an object's gravitational potential energy, the elastic potential energy of a stretched spring, and the electric potential energy of an electric charge in an electric field. The joule, denoted by the letter J in the International System of Units (SI), is the unit of energy.

Although it has connections to the Greek philosopher Aristotle's concept of potentiality, the word "potential energy" was first used in the 19th century by the Scottish engineer and scientist William Rankine.

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Answer:

A) The ball will roll forever in a straight path.

First, for this problem, we will need to know the formula for time dilation

Where t is the time in the reference frame on earth

t0 is the time on the ship

v is the velocity relative to lightspeed

and c is light speed in a vacuum

For this problem, we will need to convert .93x10^8 to a fraction of light speed.

.93x10^8 = .31c

Now, we can plug in the numbers we get from the given

t0 = 6 hours since the ship has been in the air for 6 hours

t = 6.31089

For the answer to be valid, we will convert .31089 to minutes by multiplying it by 60 (60 minutes in a hour)

18.654 minutes

Given that the car speeds up at a steady 1.3 m/s2, and the magnitude of the centripetal acceleration is equal to the tangential acceleration. We can use the following equations in order to determine the time required to attain the magnitude of centripetal acceleration equal to tangential acceleration.  

The centripetal acceleration of an object moving in a circle is given by the formula;\(a_c = v^2/r\) Where v is the speed of the object and r is the radius of the circle.

Therefore, t = 5.7/1.3

= 4.385 seconds. So, the time after which the magnitude of the centripetal acceleration is equal to the tangential acceleration is 4.385 seconds (rounded to 2 decimal places).

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The average density of matter in galaxies is approximately \(10^-^3^0\)\(g/cm^3\). This is a fraction of the critical density calculated in the chapter.

To calculate the average density of matter in galaxies, we need to determine the mass per unit volume. Given that the average galaxy contains\(10^1^1\)times the mass of the Sun (msun) and the average distance between galaxies is 10 million light-years, we can make use of these values.

First, we need to convert the distance between galaxies into a more suitable unit. Since the speed of light is a known constant, we can convert 10 million light-years into meters by multiplying it by the number of seconds in a year (approximately 3.15 x \(10^7\) seconds) and the speed of light (approximately 3 x\(10^8\) meters per second). This gives us a distance of approximately 9.46 x \(10^2^4\) meters.

Next, we calculate the volume of the average distance between galaxies by considering it as a sphere with a radius equal to the converted distance. The volume of a sphere can be calculated using the formula (4/3)πr³. Substituting the value for the radius, we find the volume to be approximately 3.51 x \(10^7^4\) cubic meters.

To determine the average density of matter, we divide the mass of a galaxy (\(10^1^1\) msun) by the volume between galaxies. Since the mass of the Sun is approximately 2 x \(10^3^0\) kilograms, the mass of an average galaxy is approximately 2 x \(10^4^1\)kilograms. Dividing this value by the volume, we obtain a density of approximately 5.69 x \(10^-^3^1\) \(kg/m^3\), or approximately \(10^-^3^0 g/cm^3\).

Comparing this density to the critical density calculated in the chapter, we find that it is significantly lower. The critical density is the threshold required for the universe to be geometrically flat, and it is estimated to be approximately\(9 x 10^-^2^7 kg/m^3\). Therefore, the average density of matter in galaxies represents only a fraction of the critical density.

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A trait shared by dolphins and bats  will be the need to move quickly through dark environments.

Our understanding of the evolution of echolocation in bats has shifted as a result of recent molecular phylogenies. These phylogenies imply that bats with advanced echolocation

According to one interpretation of these trees, laryngeal echolocation originated in the ancestor of all living bats. Echolocation may have been lost in Old World fruit bats

The vast adaptive radiation in echolocation call design is substantially controlled by ecology, demonstrating how environmental perceptual problems influence call design.

A trait shared by dolphins and bats that possibly led to the evolution of echolocation in these two animal groups will be the need to move quickly through dark environments.

Hence option A is correct.

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Answer:

D

Explanation:

Answer:

The quadratic function models the path of the rocket. When we substitute an x value, we can determine the height in feet of the rocket.

To determine the height it was launched from, we would look at the y-intercept. This represents the starting value, as time = 0 in this point (cannot have negative time).

To determine how far the rocket traveled, we would look at the positive x-intercept of the expression. At this point, height = 0, so we can see the distance from start to finish of the rocket.

To determine the greatest height achieve, we would look at the vertex of the parabola generated from the given function. Using (-b/a, f(-b/a)), we can determine the greatest height achieved.

Answer: this answer is definitely c for k12

Explanation:

Answer:

Explanation:

Three screens are placed one behind the other and light falls on all of them from a torch . In this case a mirror can be only the last screen . In case of first or second screen being a mirror , light would not have reached the last screen because the nature of mirror is to reflect the light back.

Hence , the only possibility is that , the last screen is mirror.

Sound waves carry energy parallel to the motion of the wave, while light waves carry energy perpendicular to it.

We know that light is electromagnetic wave and also we have to know that light is a transverse wave. The implication of that is that the direction of the wave motion is parallel to that of the disturbance that is causing the wave.

Light waves have higher intensity than sound waves and can cause more damage. The human eye is much more sensitive to light than the human ear is to sound.

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Answer:

D is  the answer
Sound waves carry energy parallel to the motion of the wave, while light waves carry energy perpendicular to it.

Explanation:

To select the proper diametral pitch for the gear set, we can use the static ductile Lewis equation, which relates the gear-tooth bending stress to the diametral pitch. The formula is given by:

S = (Pd * Y * K * √(W * F)) / (C * J)

Where:

S is the allowable bending stress (18 ksi)

Pd is the diametral pitch (teeth/inch)

Y is the Lewis form factor (dependent on the number of teeth)

K is the load distribution factor

W is the transmitted power (in horsepower)

F is the facewidth of the gears (in inches)

C is the Lewis empirical constant

J is the Lewis geometry factor

Given:

Transmitted power W = 10 horsepower

Pinion teeth N₁ = 26

Gear teeth N₂ = 40

Facewidth F = 1 inch

Allowable bending stress S = 18 ksi

First, let's calculate the Lewis form factor Y for both the pinion and the gear. The Lewis form factor can be found using empirical tables based on the number of teeth.

For the pinion:

Y₁ = 0.154 - (0.912 / N₁) = 0.154 - (0.912 / 26) ≈ 0.121

For the gear:

Y₂ = 0.154 - (0.912 / N₂) = 0.154 - (0.912 / 40) ≈ 0.133

Next, we need to calculate the load distribution factor K. This factor depends on the gear's geometry and can also be found in empirical tables. For a standard spur gear with 20-degree pressure angle and a 1-inch facewidth, the value of K is typically 1.25.

K = 1.25

Now, let's substitute the known values into the static ductile Lewis equation:

S = (Pd * Y * K * √(W * F)) / (C * J)

We can rearrange the equation to solve for the diametral pitch Pd:

Pd = (S * C * J) / (Y * K * √(W * F))

Substituting the known values:

Pd = (18 ksi * C * J) / (0.121 * 1.25 * √(10 hp * 1 inch))

Now, we need to determine the Lewis empirical constant C and the Lewis geometry factor J based on the gear parameters.

For a standard spur gear with 20-degree pressure angle, the Lewis empirical constant C is typically 12.

C = 12

The Lewis geometry factor J can be calculated using the formula:

J = (1 - (B / D)) * (B / D) * ((1 - (B / D)) / (1 - (B / D)^(2/3)))

Where B is the facewidth and D is the pitch diameter of the gear.

Let's calculate the pitch diameter of the gear:

Pitch diameter = Number of teeth / Diametral pitch

For the pinion:

Pitch diameter of pinion = 26 teeth / Pd

For the gear:

Pitch diameter of gear = 40 teeth / Pd

Finally, let's calculate the Lewis geometry factor J for the gear set:

J = (1 - (B / D)) * (B / D) * ((1 - (B / D)) / (1 - (B / D)^(2/3)))

Substituting the known values:

J = (1 - (1 inch / Pitch diameter of gear)) * (1 inch / Pitch diameter of gear) * ((1 - (1 inch / Pitch diameter

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Answer:13,3 m/s

Explanation:We can use the Torricelli equation:

v^2=v0^2+2ah

the initial velocity is 0

v0^2=0

so:

v^2=0+2*9,8*9

v^2=176,4

v=13,3 (approx)

Answer:

For me i think the answer will be 13.72m/s

Explanation:

Voltage:

Voltage is equal across all components in a parallel circuit.

Current:

The total circuit current is equal to the sum of the individual branch currents.

Resistance:

Individual resistances diminish to equal a smaller total resistance rather than add to make the total

Answer:

just to make the other person who answered brainlist!

Explanation:

Radio waves, microwaves, infrared rays, visible rays, ultraviolet rays, X-rays, gamma rays. Radio waves have long wavelengths and low frequencies, while gamma rays have short wavelengths and high frequencies.

In physics, electromagnetic radiation consists of space-propagating electromagnetic field waves carrying momentum and electromagnetic radiation energy. These include radio waves, microwaves, infrared rays, light, ultraviolet rays, X-rays, and gamma rays. The seven Electromagnetic Waves in ascending order of frequency and descending order of wavelength are:

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Answer:

try 2.4136 as an answer/ good luck

The electric field vector at a point P located directly below a single negative point source charge Q is directed upward.

The direction of the electric field around a point charge depends on the charge of the source. In this case, since the source charge Q is negative, the electric field lines radiate outward from the charge in all directions.

At a point directly below the negative source charge, the electric field vectors will point directly away from the charge, which is upward. This is because the negative charge repels negative charges and attracts positive charges.

The electric field vector indicates the direction in which a positive test charge would move if placed at that point. Since the source charge is negative, a positive test charge placed at point P would experience a repulsive force and be pushed away from the source charge, resulting in an upward direction for the electric field vector.

Therefore, the electric field vector at a point directly below a negative point source charge Q point upward.

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Answer:

The answer should be south

Explanation:

Because it has more force to the south then to the north, west and east are the same so (40N South)

The correct answer is option A. Water is not a state/ phase of matter

States are those phases that describe its physical attributes as well as how its constituent particles are arranged. Solid, liquid, gas, and plasma are the four main states of matter that can exist.

When something melts, it transitions from a solid to a liquid condition.

Water has a freezing point of 0°C.The melting point of flour is around 220 degrees Celsius, which is greater than that of salt and sugar. Sublimation is the process by which a solid transforms into a gaseous state, as in the case of camphor. Examples of changes in the states of matter include the melting of ice, the freezing of water, the burning of camphor, the melting of wax, and the production of precipitates.

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In the given figure, four long straight wires perpendicular to the page form a square with an edge length of "a."

The arrangement described can be visualized as four long straight wires positioned perpendicular to the page, intersecting at their centers to form a square. Each wire can be thought of as an infinitely long line, with their cross-sections creating the square shape. The wires are oriented such that they are perpendicular to the page, meaning they extend in a direction perpendicular to the two-dimensional plane of the page.

The square formed by the wires has an edge length of "a," which implies that each side of the square has a length of "a." The wires intersect at the center of the square, dividing it into four equal sections. The configuration of the wires allows for a symmetrical arrangement, with each wire positioned at a 90-degree angle to its adjacent wires.

This setup involving perpendicular wires forming a square can have various applications in physics, engineering, and circuit design, as it provides a simple and symmetrical arrangement for the interaction of electric currents, magnetic fields, and other related phenomena.

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Answer:

Do you have a picture of your work?, Maybe i could help with it if you did.

Answer:

Hi, can you send the list of topics? I'd be happy to help you review. Also, did you meet with your instructor to complete the discussion-based assessment?

Explanation:

The momentum of the 5kg object before the collision is; 50kgm/s.

The momentum of a body is mathematically evaluated as the product of its mass and velocity of motion.

According to the question;

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To calculate the mass of water that needs to be removed from the cellar, we need to consider the change in humidity.

First, we need to determine the initial and final absolute humidity (AH) values. Absolute humidity is the mass of water vapor per unit volume of air.

Given:

Floor space = 88.3 m²

Ceiling height = 2.79 m

Initial humidity = 97.0%

Final humidity = 31.2%

AH = (absolute humidity * saturation vapor pressure) / (temperature + 273.15)

The saturation vapor pressure at 20°C is approximately 2.34 kPa.

Initial AH = (0.97 * 2.34) / (20 + 273.15) = 0.2693 kPa

Final AH = (0.312 * 2.34) / (20 + 273.15) = 0.0861 kPa

Volume = floor space * ceiling height = 88.3 m² * 2.79 m = 246.057 m³

Initial mass of water vapor = Initial AH * Volume = 0.2693 kPa * 246.057 m³ = 66.357 kg

Final mass of water vapor = Final AH * Volume = 0.0861 kPa * 246.057 m³ = 21.194 kg

Mass of water to be removed = Initial mass - Final mass = 66.357 kg - 21.194 kg = 45.163 kg.

In order to drop the humidity from 97.0% to 31.2%, approximately 45.163 kg of water needs to be removed from the cellar.

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Electromagnetic radiation is a type of radiation in which the energy is carried through oscillating electromagnetic fields. It contains different types of radiation with different frequencies.

The following are the different types of electromagnetic radiation, ranked by frequency (from lowest to highest frequency:

Radio waves: Radio waves have the longest wavelength and the lowest frequency in the electromagnetic spectrum. They are used in television and radio transmissions, as well as in mobile phones and other communication devices. They have a frequency range of 3 kHz to 300 GHz.

Microwaves: Microwaves have a higher frequency than radio waves but lower than infrared radiation. They are used in microwave ovens, as well as in communication devices such as mobile phones, Wi-Fi routers, and satellite communications. They have a frequency range of 300 MHz to 300 GHz.

Infrared radiation: Infrared radiation has a higher frequency than microwaves but lower than visible light. It is used in infrared heaters, remote controls, and some medical applications. It has a frequency range of 300 GHz to 400 THz.

Visible light: Visible light is the part of the electromagnetic spectrum that we can see with our eyes. It has a higher frequency than infrared radiation but lower than ultraviolet radiation. It is used in lighting and optical communication devices. It has a frequency range of 400 THz to 800 THz.

Ultraviolet radiation: Ultraviolet radiation has a higher frequency than visible light but lower than X-rays. It is responsible for sunburns and tans. It is also used in some medical applications. It has a frequency range of 800 THz to 30 PHz.X-rays:X-rays have a higher frequency than ultraviolet radiation but lower than gamma rays. They are used in medical imaging and airport security scanners. They have a frequency range of 30 PHz to 30 EHz.

Gamma rays: Gamma rays have the highest frequency and the shortest wavelength in the electromagnetic spectrum. They are produced by the decay of radioactive materials and in nuclear reactions. They have a frequency range of 30 EHz to 3000 EHz.

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Answer:

a) a = 6.72 10⁻⁵ m,  b)  the slit (a) is smaller, which represents a wider pattern

Explanation:

In is a diffraction experiment since we have a single slit, it is explained by the equation

          a sin θ = m λ

where a is the width of the slit

The diffraction pattern is characterized by a very intense central maximum, with a value of 5.0 cm, therefore the distance from the center to the first zero is y = 5.0 / 2 cm = 2.5 10⁻² m

let's use trigonometry to enter the angle

         tan θ = y / L

         tan θ = sin θ / cos θ = sin θ

         sin θ = y / L

substituting into the equation

          a y / L = m λ

the first maximum occurs for m = 1

          a = λ L / y

let's calculate

          a = 560 10⁻⁹ 3.0 / 2.5 10⁻²

          a = 6.72 10⁻⁵ m

b) if the width a of the slit (a) is smaller

        sin θ = m λ / a

therefore the sinus increases, which implies a greater angle, which represents a wider pattern

c) if the distance to the screen (L) goes away

           y = m λL / a

If L increases the width of the pattern they also increase of course the intensity must be less

d) If the wavelength increases

    In this case the width of the pattern also increases

e) What happens if the light passes through two slits in this case we have two diffraction patterns one centered in each slit and the resulting pattern is the sum of these patterns, this sum gives the double slit interference that characterizes a series of slits of equal height

If solid iron is dropped in liquid iron, it will sink to the bottom of the liquid iron due to its higher density. The liquid iron will flow around the solid iron as it sinks and will eventually surround it completely.

The solid iron will start to melt due to the high temperature of the liquid iron, and the molten iron will mix with the liquid iron. The solid iron will continue to sink until it reaches the bottom of the container, where it will settle. The resulting mixture of molten and solid iron will reach thermal equilibrium, where the temperature and density of the mixture will become uniform throughout.

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