What is the ocean floor made of?

Answer:

330 Hz

Explanation:

edg2020

The best estimate of the frequency Suzy hears after the car passes her is govern by doppler effect and it is 330 Hz.

Frequency is the number of occurrences of a repeating event per unit of time.

The Doppler effect is the change in frequency of a wave in relation to an observer who is moving relative to the wave source.

According to the Doppler Effect, the frequency observed by an observer decreases for source going away.

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Th beste description for static electricity is that It is caused by separated positive and negative charges.

Static electricity referes to electricity that is static or that do not flow.

It is caused by separated positive and negative charges.

Therefore, the best description for static electricity is that It is caused by separated positive and negative charges.

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Answer:

B

Explanation:

Answer:

All the above

Explanation:

Explanation:

2/3  * 5/7 * 6/5 =   60 / 105 =   12:21   = 4:7

Hi There!!

In physics, the concept of a frame of reference is used to specify the perspective from which an object or event is observed.

1). A frame of reference is where the measurements or observations will be made. Because of this, observing an event may be different when changing from one frame of reference to another, because the measurements will be different.

2). Defining frames of reference is necessary because the movement is relative, it may be that from our perspective or from a frame of reference on earth we are at rest, but seen from a frame of reference in space, we are in motion due that the earth is always moving.

3). Another example of frames of reference is a moving plane. Seen from the ground an object in the plane moves at the speed at which the plane travels, but if the frame of reference is fixed on the plane, the object is at rest.

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The new focal length of the glass lens submerged in water is more than 10 cm. The correct option is C. To determine the new focal length of a glass lens submerged in water, we need to consider the lens maker's formula and the refractive indices of the materials involved.

The lens maker's formula is:
1/f = (n_lens/n_medium - 1) * (1/R1 - 1/R2)

Where:
- f is the focal length
- n_lens is the refractive index of the lens (glass)

- n_medium is the refractive index of the surrounding medium (air or water)
- R1 and R2 are the radii of curvature of the lens surfaces

We are given that the focal length of the lens in air is 10 cm. The refractive index of water (n_water) is greater than air (n_air) but less than glass (n_glass). When the lens is submerged in water, n_medium changes from n_air to n_water.

Since n_water > n_air, the value of (n_lens/n_medium - 1) will be smaller when the lens is in water compared to when it's in air. This will result in a larger focal length (f) for the lens when submerged in water.

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Answer:

permanent set

.............

Johann squeezes a bagel too hard that it is not able to return to its original shape. The bagel has Plastic deformation.

Plasticity, also referred to as plastic deformation, is the property of a solid material to undergo permanent deformation, a non-reversible change in shape in response to applied forces.

It is a concept used in physics and materials science. For instance, plasticity is demonstrated when a solid piece of metal is bent or pounded into a new shape because the material itself undergoes lasting modifications. Engineering professionals use the term yield to describe the change from elastic to plastic behavior.

Most materials, especially metals, soils, rocks, concrete, and foams, show signs of plastic deformation.

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The heat added is 348.165 kj

The enthalpy of vaporization, commonly known as the heat of vaporization or heat of evaporation, is the amount of energy required to turn a liquid material into a gas. The enthalpy of vaporization depends on the pressure at which the transition occurs.

The heat of vaporization varies with temperature, yet for small temperature ranges and decreased temperature ranges, a constant heat of vaporization can be assumed. The heat of vaporization decreases with rising temperature until it totally disappears at a point known as the crucial temperature. The liquid and vapor phases are indistinguishable beyond the critical temperature, and the material is referred to as a supercritical fluid.

Given that;

M = 150g = 0.15kg

T = 75oC

Heat capacity, h =2321.1 kj/kg

Q = m h

Q = 0.15* 2321.1

Q = 348.165 kJ

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Answer:

If lone pairs of electrons, electrons not bonded to other atoms, are located in the molecule, this will change the molecular geometry, not the electron geometry. If all the electron groups are bonded, with no lone pairs, then the electron geometry and molecular geometry are the same.

The best way to summarise the key results in a lab guide is by representing them through diagrams.

The important findings in a lab report are those that confirm or refute the working theories. Furthermore, other findings that are crucial to understanding the processes and/or mechanisms explored in the experiment may also be among the significant findings. The best way to summarise these results is by presenting them through diagrams o graphical presentation.

Key outcomes in an experiment can be findings that serve as stepping stones toward the trial's conclusion or findings that may not directly relate to the experiment itself but are nonetheless crucial to its success. A significant finding in an experiment is one that determines whether a hypothesis is accepted or rejected.

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The magnitude of the resultant force is approximately \(33.3 lb.\)

To find the magnitude of the resultant force and the angle it makes with the positive x-axis when given the magnitudes of two forces,\(|a| = 28 lb\)and \(|b| = 18 lb\), we can use vector addition.

Let's assume that force a is represented by vector A, and force b is represented by vector B. We can find the resultant force R by summing the vectors A and B.

The magnitude of the resultant force can be calculated using the Pythagorean theorem:

\(|R| = sqrt(|A|^2 + |B|^2)\)

Substituting the given magnitudes:

\(|R| = sqrt((28 lb)^2 + (18 lb)^2)\)

\(|R| ≈ sqrt(784 lb^2 + 324 lb^2)\)

\(|R| = sqrt(1108 lb^2)\)

\(|R|= 33.3 lb\) (rounded to one decimal place)

To find the angle the resultant force makes with the positive x-axis, we can use trigonometry. The angle can be calculated as:

\($\theta = {tan}\left(\frac{{\lvert B \rvert}}{{\lvert A \rvert}}\right)$\)

Substituting the given magnitudes:

θ = atan(18 lb / 28 lb)\($\theta = {tan}\left(\frac{{18lb}}{{28lb}}\right)$\)

\($\theta= 33.2\)degrees (rounded to one decimal place)

Therefore, the magnitude of the resultant force is approximately \(33.3 lb,\)and the angle it makes with the positive x-axis is approximately 33.2 degrees.

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A detail from the text which best corrects Sachi's prediction is that 8 in 10 Americans said it evoked national pride and it would be achieved again someday.

Apollo 11 can be defined as an American spaceflight that was officially launched on the 16th of July, 1969 at exactly 2:32 pm (GMT+1), so as to land humans on the Moon for the first time.

Historically, Neil Armstrong was the commander of Apollo 11, which is often considered to be a national pride to the United States of America.

In conclusion, a detail from the text which best corrects Sachi's prediction is that eight (8) in ten (10) Americans said Apollo 11 evoked national pride and it's a kind of achievement that the U.S.A is likely to achieve again someday.

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Answer:

objective 4

Explanation:

i took the unit test review and the regular unit test

Object 4 with a density of 2.3 g/cm³  would sink in honey, which has a density of 1.4 g/cm³, therefore the correct option is option D.

It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.

The mathematical formula for density is given below

ρ =m /v

where ρ is the density of the substance

m is the mass of the substance

v is the volume of the substance

As per the law of floatation, the objects those have less density than the honey do not sink in the honey which has a density of 1.4 g/cm³.

As per the given options, object 1 has a density of 0.9 g/cm³ which is less than the density of honey 1.4 g/cm³, therefore it would not sink in the honey. similarly, objects 2 and object, 3 have a density that is less than the density of the honey, therefore they would float instead of sinking in the honey.

The only object 4  has a density of 2.3 g/cm³ which is more than the density of honey, therefore it would sink on the honey.

Hence, the correct answer is object 4.

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speed required for the predetermined elliptical trajectory of the planet is 7908m/s

The speed necessary for the given circular orbit around Earth is given as follows;v = V GM/r.Here is the solution; Given formula:v = V GM/r.We know that the mass of the earth is 5.77 x \(10^(24)\) kg and the radius of the orbit is 6.38 x\(10^6\)m.

The gravitational constant is 6.67 x \(10^-11 m^3/(kg s^2).\)We can now substitute the values into the equation to get the speed:v = V GM/r = V (6.67 ×\(10^( 11)\) Nm²/kg²) (5.97 × \(10^{24}\)kg)/ (6.38  m) = 7908 m/s. Therefore, the speed necessary for the given circular orbit around Earth is 7908 m/s.

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The piece of evidence that suggests that the inner planets were formed from the same rotating cloud of gas and dust is that the planets orbit the sun in the same direction and in the same plane

Smaller planets like Mercury, Venus, Earth, and Mars are considered inner planets. Mercury is thought to be the smallest inner planet, with Earth being the largest. The vastly larger outer planets, such as Jupiter, Saturn, Uranus, and Neptune, are the opposite.

A route that an object or planet in space follows around another body is referred to as an orbit. Moons are satellites that orbit many planets. A man-made satellite is also possible, such as the International Space Station.

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\(\boxed{\sf W=Fscos\Theta}\)

\(\\ \sf\longmapsto W=150(50)cos 60\)

\(\\ \sf\longmapsto W=7500\times \dfrac{1}{2}\)

\(\\ \sf\longmapsto W=3750J\)

Answer:

\(y = \frac{ - 1}{3}x + \frac{7}{3} \)

Explanation:

\( \frac{y - 3}{2 - 3} = \frac{x + 2}{1 + 2} \\ \ - y + 3 = \frac{x + 2}{3} \\ y = \frac{ - 1}{3}x + \frac{7}{3} \)

Scott Kelly will likely make history as the first American astronaut to spend a full year in space.

He is a retired astronaut who spent 340 consecutive days on the International Space Station from March 2015 to March 2016, and his mission was part of a study to gather detailed information about the effects of long-duration spaceflight on the human body.

Scott Joseph Kelly (born February 21, 1964) is a retired astronaut and naval aviator from the United States. Kelly, a four-time spaceflight veteran, commanded the International Space Station (ISS) on Expeditions 26, 45, and 46.

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The pH of the solution is approximately 4.195, which corresponds to answer choice E.

The benzoic acid and sodium benzoate will react to form a buffer solution. We can use the Henderson-Hasselbalch equation to determine the pH of the buffer:

pH = pKa + log([A-]/[HA])

where pKa is the dissociation constant of benzoic acid (6.30 × \(10^{-5\)), [A-] is the concentration of benzoate ions, and [HA] is the concentration of benzoic acid.

To calculate the concentrations of [A-] and [HA], we need to use the stoichiometry of the reaction. The reaction is:

\(C_6H_5COOH + NaC_6H_5COO\) →\(C_6H_5COO^- + Na^+ + H_2O\)

From this equation, we can see that one mole of benzoic acid reacts with one mole of sodium benzoate to form one mole of benzoate ions and one mole of water. Therefore, the concentration of benzoate ions is:

[A-] = 0.300 mol / 1.00 L = 0.300 M

The concentration of benzoic acid is:

[HA] = 0.150 mol / 1.00 L = 0.150 M

Now we can substitute these values into the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

pH = -log(6.30 × \(10^{-5\)) + log(0.300/0.150)

pH = 4.195

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"This was the idea that non-living objects can give rise to living organisms."

Answer:

 V₁ = 6 V ,  V₂ = V₃ = 3 V

Explanation:

To solve this circuit we must remember that there are two fundamental types of construction in series and parallel.

* a serial circuit there is only one path for current

in this circuit the constant current in the entire circuit and the voltage is the sum of the voltage of each term

* Parallel circuit in this there are two or more paths for the current

in this circuit the voltage is constant and the east is divided between each branch

with these principles let's analyze the proposed circuit

The DC battery is in parallel with resistor R1 and the equivalent of the other branch,

as in a parallel circuit the voltage is constant

               V₁ = 6 V

in the other branch (23) it forms a series construction, where the current is constant

               6 = iR₂ + iR₃

as they indicate that each resistance has the same value

              6 = 2 iR

              V = V₂ = V₃ = 3 V

Answer:

\(approx.= 25\frac{m}{s}\)

Explanation:

Centripetal acceleration (a) is defined as the square of an object's velocity (V^2) divided by the distance of the object from it's point/axis of revolution (r). So:

\(a=\frac{V^{2} }{r}\)

which allows us to solve for the velocity:

\(V=\sqrt{ar}\\ Since: a=3.04g=(3.04)(9.81),r=21;\\V=\sqrt{(3.04)(9.81)(21)} =25.02...\)

Answer:

25 m/s

Explanation:

A = v^2r

The square root of Ar = v

V = square root of 3.04 x 21 x 9.8 = 25m/s

Make sure to add 9.8 as acceleration is 3.04g or 3.04 x 9.8

During the first year of life, babies go through a series of developmental milestones in terms of sounds and gestures. Here is the order of the sequence, beginning with the earliest form at the top:1. Crying: Crying is one of the first forms of communication that babies use to express their needs or discomfort.

It is a natural instinct and serves as a way to get attention and assistance from caregivers.2. Cooing: Around 2 to 3 months, babies begin to produce cooing sounds. These are soft, vowel-like sounds that babies make when they are content and happy. It is an early attempt at vocalization.

3. Babbling: Between 6 to 8 months, babies start babbling. This is when they produce repetitive syllables such as "ba-ba" or "da-da." It is an important step in language development and helps babies practice using their vocal cords.
4. Gesturing: By around 9 to 12 months, babies start to use gestures to communicate. This includes waving goodbye, pointing at objects, or reaching out to be picked up. These gestures are their way of expressing their desires and interacting with their environment.

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Answer:

The answer is True

Explanation:

I hope it helps

Answer:

it's true

Explanation:

High–pitched sounds have short wavelengths, which means that the peaks are close together. Low–pitched sounds have longer wavelengths, so the peaks are more spread out.

In considering the advantages and disadvantages of a space probe compared to a piloted spacecraft, several factors come into play.

Advantages of space probes include:

1. Cost-effectiveness: Space probes are generally less expensive than piloted spacecraft because they don't require life-support systems or accommodations for humans.

2. Safety: Since space probes are unmanned, there is no risk to human life during missions. This allows for the exploration of potentially hazardous environments without putting astronauts in danger.

3. Longevity: Space probes can operate for extended periods, often years, without the need for human intervention. This enables them to travel vast distances and conduct extensive research.

4. Payload capacity: Space probes can carry more scientific instruments and experiments than piloted spacecraft, as they do not require space and resources for human crew members.

Disadvantages of space probes include:

1. Limited flexibility: Space probes follow predetermined mission plans, limiting their ability to adapt to unexpected discoveries or situations.

Piloted spacecraft have the advantage of human decision-making and problem-solving capabilities on the fly.

2. Communication delays: Due to the vast distances involved in space exploration, communication between space probes and mission control can be significantly delayed.

This can hinder real-time decision-making and problem-solving.

3. Maintenance and repair: If a space probe experiences a technical issue, it is often impossible to repair it remotely. In contrast, astronauts on piloted spacecraft can perform maintenance and repairs on site.

4. Public interest and inspiration: Human space exploration has historically captured the public's imagination more than robotic missions. This can influence funding and public support for space exploration programs.

In summary, space probes offer cost-effectiveness, safety, longevity, and payload capacity advantages over piloted spacecraft.

However, they face limitations in flexibility, communication, maintenance, and public engagement compared to human-led missions.

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Despite the units frequently seen on laboratory scales, the most appropriate unit below for quantifying weight is the Newton.

A Newton is the international unit of weight which is equal to the force required to accelerate a mass of one kilogram at a rate of one meter per second squared, in the absence of other force fields. Units of measurement can be categorized into two, which are fundamental units and derived units. A fundamental unit is a unit that cannot be broken down further, while a derived unit is a unit that can be obtained by multiplying two or more fundamental units.

Mass is a fundamental unit of measurement, but weight is a derived unit of measurement. It is derived from the force exerted by an object as a result of gravity. The force exerted by an object as a result of gravity is given by the mass of the object multiplied by the acceleration due to gravity, which is 9.8 m/s² on the earth's surface. So therefore, the most appropriate unit for quantifying weight is the Newton.

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The combination of frequencies that produce the lowest beat frequency is 10 Hz and 15 Hz. The correct option is C.

To determine the beat frequency, we subtract one frequency from the other and take the absolute value. The beat frequency is the difference between the frequencies involved in the interference pattern created by two sound waves.

Let's analyze each option:

A. 500 Hz and 501 Hz: The beat frequency would be 501 Hz - 500 Hz = 1 Hz.

B. 10 Hz and 20 Hz: The beat frequency would be 20 Hz - 10 Hz = 10 Hz.

C. 10 Hz and 15 Hz: The beat frequency would be 15 Hz - 10 Hz = 5 Hz.

D. 500 Hz and 600 Hz: The beat frequency would be 600 Hz - 500 Hz = 100 Hz.

Therefore, option C (10 Hz and 15 Hz) produces the lowest beat frequency of 5 Hz compared to the other options.

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Answer:

B. A dish of water is placed in the freezer and turns solid

Explanation:

it is a physical change because it can return to its original state by physical means. the other options are chemical changes because things like color change, bubbles or fizzing, and odor change all indicate a chemical change and cannot return to the original state it was in before.