what happens when the velocity of seismic waves increases when passing from a shallower to deeper rock layer?

Answer:

Option C, Turbines

Explanation:

An electric motor comprise of following components-

a) Magnets

b) Electric wire or solenoid

c) Motor shaft

Turbine is a component of power producing plant that is essential to rotate the shaft of the motor. Once the shaft is rotated, the electric coil placed between the magnets is also rotated. Rotating coil cut the magnetic fields to induce emf and hence electric current is produced from mechanical work (i.e rotation).

Hence, option C is correct

ANSWER

EXPLANATION

The efficiency of the pulley system is given by:

Hence, the efficiency of the pulley system is:

That is the answer.

Answer:

I think its B but if not then its D

Explanation:

Answer:

b

Explanation:

The student returned to starting point hence the displacement is zero.

The displacement refers to the distance that is covered in a specified direction. The difference between distance and displacement is that displacement is a vector quantity while distance is a scalar quantity.

If displacement is a vector quantity, it then follows that the direction must be taken into consideration when we are talking about the displacement of the body.

Looking at the fact that the student moves backwards and returns to a position marked 20 meters another 7 seconds later, it then follows that the student returned to starting point and that the displacement is zero.

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The true statements are:Jupiter's Great Red Spot is in the southern hemisphere.The fastest wind speed recorded in our solar system is on Neptune.

Among the given statements, only two are true. Jupiter's Great Red Spot, a massive storm, is indeed located in the southern hemisphere of the planet. The Great Red Spot is a prominent feature on Jupiter, visible as a giant swirling storm system. On the other hand, the fastest wind speed recorded in our solar system, reaching speeds of up to 2,100 kilometers per hour (1,300 miles per hour), is found on Neptune.

The strong winds on Neptune contribute to its dynamic atmosphere and the formation of features like the Great Dark Spot. The remaining statements about Pluto, Saturn's moon Enceladus, and Uranus are not true according to our current understanding.

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Answer:

Machines can reduce force but not work.

Work = force * distance

If a machine reduces the force input by a factor of two, say, then the distance traveled by the applied force must be doubled

One cannot get more work out of a machine than the work input to the machine.

Based on the calculations, the speed of this roller coaster at the bottom of the hill is equal to: B. 39.6 m/s.

Given the following data:

Height = 80.0 meters.

Scientific data:

Acceleration due to gravity (g) = 9.8 m/s².

In accordance with the law of conservation of energy, the potential energy possessed by the roller coaster at the top is equal to the kinetic energy possessed by the roller coaster at the bottom of the hill:

PE = KE

mgh = ½mv²

2mgh = mv²

v = √(2gh)

Substituting the given parameters into the formula, we have;

v = √(2 × 9.8 × 80)

v = √1,568

Speed, v = 39.6 m/s.

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According to the theory of the solar system formation. The composition of the solar nebula was 98% hydrogen and helium. The sun and the planets developed from the same nebula. A portion of the nebula collapsed, resulting in the formation of the sun, which is the central star of the solar system.

The rest of the nebula, which consisted of gas and dust, flattened into a spinning disc around the sun. As a result of the disc's spinning motion, the dust and gas collided, coalescing to form larger objects. These items became the building blocks of planets, moons, asteroids, and comets as they gradually increased in size and mass. Asteroids and comets are examples of these remnants.

Asteroids and comets are remnants of the formation of our solar system, according to the theory of solar system formation. Asteroids are mainly found in the asteroid belt, which lies between the orbits of Mars and Jupiter. Comets have elliptical orbits, taking them from the outskirts of the solar system to the inner solar system.

They are considered to be relics from the formation of our solar system. As a result of gravitational pull and various other factors, comets and asteroids occasionally collide with the Earth.

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Asteroids, made of rocky and carbon-rich material, and comets, composed largely of ice, are remnants of the solar nebula from which the solar system was formed. Their varying compositions suggest that the differentiation of elements happened during the solar system's formation, caused by the contraction of a cloud of gas and dust.

Asteroids and comets in the solar system are considered remnants of the solar nebula, which was composed primarily of hydrogen and helium. These objects represent the primordial material from which the solar system was formed. Asteroids are more rock-like and carbon-rich, representing a transitional phase. On the other hand, comets found in regions like the Oort cloud and the Kuiper belt are icy objects, demonstrating that the outer solar system is dominated by icy compositions.

This forms a stark contrast to the inner planets which are metal-rich, showing a progression from metal-rich compositions to ice-dominated ones as we move from the inner to the outer solar system. According to the theory of solar system formation, these variations in composition are the results of the original cloud of gas and dust contracting - and conserving its angular momentum - to form the Sun and a spinning disk of dust and vapor. Over time, the planets were heated by the accretion of in-falling materials leading to their differentiation. The asteroids and cometary remnants we see today are largely the debris that survived these violent impacts and the subsequent clean-up.

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According to Charles Darwin's theory of natural selection, humans and apes shared common biological ancestry, and plants and animals that could adapt to their environment were more likely to survive.

Charles Darwin's theory of natural selection, as outlined in his seminal work "On the Origin of Species," proposes that species evolve over time through a process of natural selection. The theory states that all living organisms, including humans and apes, share a common biological ancestry and have gradually diverged through the mechanism of evolution.

This idea challenges the notion of a distinct, separate creation of humans and reinforces the concept of a unified tree of life. According to Darwin, the driving force behind evolution is natural selection, which occurs when individuals with certain advantageous traits are more likely to survive and reproduce in a given environment.

This concept implies that plants and animals that possess characteristics that enable them to better adapt to their surroundings have a higher chance of survival. It is not necessarily the strongest individuals within a species that always survive, but rather those individuals with traits that are well-suited to their environment.

Darwin's theory of natural selection does not aim to disprove any specific religious account of the origin of life, such as the Judeo-Christian story. It is a scientific explanation based on observations and evidence from the natural world.

However, it has prompted discussions and debates regarding the compatibility of evolutionary theory with certain religious beliefs, particularly those that advocate for a literal interpretation of religious texts.

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The equivalent resistance for the parallel connected resistance will be

\(\dfrac{1}{R_{eq}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}\)

Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω)

Now if two resistances are connected parallel then the voltage on the resistances will be different and the same current will flow from both resistances.

\(V_{eq}=V_1+V_2\)

\(I_{eq}R_{eq}=I_1R_1+I_2R_2\)

Since \(I_{eq}=I_1=I_2\)

\(R_{eq}=R_1+R_2\)

Hence the equivalent resistance for the parallel connected resistance will be

\(\dfrac{1}{R_{eq}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}\)

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The pitch of a sound is determined by the frequency of the sound wave. The higher the frequency of the wave, the higher the pitch of the sound we perceive. Conversely, the lower the frequency of the wave, the lower the pitch of the sound we hear.

Sound waves are created by the vibration of an object, which creates pressure waves in the surrounding medium, typically air. These pressure waves travel through the air and are detected by our ears, which then translate them into electrical signals that are sent to the brain for interpretation.

The human ear is capable of detecting sounds with frequencies ranging from about 20 Hz to 20,000 Hz, although this range can vary slightly from person to person. Frequencies below this range are referred to as infrasound, while frequencies above this range are called ultrasound.

The pitch of a sound is directly related to the frequency of the sound wave, with higher frequencies corresponding to higher pitches and lower frequencies corresponding to lower pitches.

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Answer:

\(1.27\:\text{s}\)

Explanation:

We can use the following kinematics equation to solve this problem:

\(v_f=v_i+at\)

Solving for \(t\):

\(-24.5=-12.1+-9.8t,\\-12.4=-9.8t,\\t=\frac{-12.4}{-9.8}\approx \boxed{1.27\:\mathrm{s}}\)

For instance, someone travelling at an average speed of 40 miles divided by 40 minutes, or 1 mile per minute, is travelling 20 miles north and then 20 miles south (60 mph).

Calculating average speed involves dividing the whole distance travelled by the total time it took to cover that distance. Speed is the rate of movement of something at a specific time. Average speed refers to the average speed during the course of a journey.

Speed equals distance x time is the speed equation. The meter per second, abbreviated as m/s or ms-1, is the SI unit of speed.

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About 4.5 billion years ago, a dense cloud of interstellar gas and dust gave rise to our solar system. The supernova shockwave from a nearby exploding star, or supernova, may have caused the cloud to collapse.

Within the initial 10 million years of the solar system's formation, Jupiter and Saturn are assumed to have formed first and fast. Rocky planets start to develop in the warmer, star-closer regions of the disk. There isn't much gas left for the terrestrial planets to accrete after the formation of the icy giants.

Let's, therefore, travel back in time more than 4.6 billion years to the time before Earth, Sun, and even Solar System existed. We were surrounded by gas and dust, most likely in one of the spiral arms. Do you want to know how it appeared? Your favorite Hubble Space Telescope images should be helpful.

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Our solar system was created from a massive cloud of interstellar gas and dust some 4.5 billion years ago. The collapse of the cloud may have been triggered by the supernova boom from a nearby exploding star.

Jupiter and Saturn are believed to have formed initially and quickly during the first 10 million years of the solar system's creation. In the warmer, star-closer parts of the disc, rocky planets begin to form. After the development of the icy giants, there is not much gas left for the terrestrial planets to accrete. Therefore, let's go back in time more than 4.6 billion years to the period before the Earth, Sun, and even the Solar System were created. Dust and gas were all around us called supernova.

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The height to which the spans rise when they buckle is 0.0222 m.

A material will expand more as a result of being heated if its coefficient of thermal expansion is larger.

The phenomena known as thermal expansion can be seen in solids, liquids, and gases. In this procedure, the application of heat causes an object or body to expand (temperature). The term "thermal expansion" refers to an object's propensity to change its dimensions as a result of heat, including length, density, area, and volume.

The following formula can be used to determine the height to which the spans rise when they buckle:

ΔL = LαΔT

where ΔL = change in length,

L = original length,

α = coefficient of thermal expansion,

ΔT = change in temperature

the length of the bridge = 370 m,

the coefficient of thermal expansion = 1.2 × 10^-5 (°C)^-1,

the change in temperature = 20°C.

The change in length of each span is,

ΔL = LαΔT = (370/2)(1.2 × 10^-5)(20)

    = 0.0444 m

Since there are two spans, the total change in length is 0.0888 m.

h = ΔL/2 = 0.0444/2

   = 0.0222 m

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Explanation:

\( \sqrt{13} + \sqrt{13} + \sqrt{} x = 180\)

\(2 \sqrt{13} + \sqrt{} x = 180\)

\( \sqrt{} x = 180 - 2 \sqrt{13} \)

\( \sqrt{x} = 172.7888974\)

\( \sqrt{ {x}^{2} } = \sqrt{172.7888974} \)

\(x = 13.14491907\)

The magnetic field will be given by the formula B=B1+B2.

Between two wires, the magnetic field has the formula B=B1+B2.

We must first calculate the magnetic field caused by each wire before adding the two vectors to find the net magnetic field halfway between the two wires. We must subtract the two vectors in order to find the total magnetic field because the electric current flows in the opposite direction via both cables.

The magnetic influence on moving electric charges, electric currents, and magnetic materials is described by a magnetic field, which is a vector field. A force perpendicular to the charge's own velocity and the magnetic field acts on it when the charge is traveling through a magnetic field.

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The sign of the estimate of the area under the curve using left or right endpoints cannot be determined if f is not known to be increasing or decreasing on [a, b].

1. Using left endpoints would give an overestimate of the area under the curve on this interval.

2. Using right endpoints would give an underestimate of the area under the curve on this interval.

3. Using right endpoints would give an overestimate of the area under the curve on this interval.

4. Using left endpoints would give an underestimate of the area under the curve on this interval.

5. If f is not known to be increasing or decreasing on [a, b], it is not possible to determine the sign of the estimate of the area under the curve using left or right endpoints.

Suppose f is increasing on the interval [a, b] and we want to estimate the area under the curve on this interval. When using the left-hand endpoint, the rectangles will be above the curve if the curve is concave down, which will overestimate the area. When using the right-hand endpoint, the rectangles will be below the curve if the curve is concave down, which will underestimate the area. When using the left-hand endpoint, the rectangles will be below the curve if the curve is concave up, which will underestimate the area. When using the right-hand endpoint, the rectangles will be above the curve if the curve is concave up, which will overestimate the area.

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Answer:

Yes the student is correct

Explanation:

The first law of thermodynamics states that energy can neither be created nor destroyed

The second law of thermodynamics states that the entropy (disorderliness) of an isolated system always increases

Therefore, whereby energy is not supplied to maintain the orderly oscillatory motion with constant amplitude, the amplitude of the system is bound to reduce with time that is the vibration of the system must be damped

Answer:

D, valence electrons.

Explanation:

Since the number of shells are dependent on the number of valence electrons, which determines the period of the element. Because each shell of an element holds a total of 8 valence electrons, there is a chemical association that is being made between the outer electrons and the atom.

Answer:

The correct answer is D. Its valence electrons.

Explanation:

The valence electrons are those that participate in reactions with other elements.  The fewer valence electrons that an element has, the less stable it becomes; an element with a full valence electron shell does not frequently interact with other elements.  In this way, the valence electrons determine the chemical properties of an element.

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The van der Waals equation of state can be written as (P + a/v²)(v - b) = RT, where P is the pressure, v is the molar volume, T is the temperature, R is the gas constant, and a and b are constants that account for intermolecular forces and finite molecular size, respectively.

Differentiating this equation with respect to pressure at constant temperature gives ∂v/∂P = R(v - b)/(P + a/v²)². Substituting this expression into the definition of isothermal compressibility κ = −1/v(∂v/∂P)t yields κ = (RT/(P + a/v²) - b)/(vRT). Simplifying this expression and noting that a/v² is small compared to P for a van der Waals gas, we can write κ = (1/v - b)/(RT). This expression shows that the isothermal compressibility of a van der Waals gas is influenced by both its molar volume and the constant b that accounts for molecular size.

The isothermal compressibility (κ) of a Van der Waals gas can be obtained using the given expression: κ = -1/v(∂v/∂p)t. Here, v represents the molar volume, p is the pressure, and t is the temperature. For a Van der Waals gas, the equation of state is given by (p+a/v²)(v-b)=RT, where a and b are constants, and R is the gas constant. By differentiating this equation with respect to pressure and holding temperature constant, we can obtain the required expression for isothermal compressibility. After differentiation and some simplification, we arrive at the expression: κ = (1/(RT - a/v²)).

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Answer:

300 kelvin

Explanation:

Answer:

This is because it has ns1 electron configuration like the alkali metals.

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Answer: Earthquakes and Volcanic eruptions

Explanation:

You did not attach a picture however, this should be the correct answer.

Mid-oceanic ridge plate  boundaries such as the Mid-Atlantic Ridge form as a result of plate separating at the boundary. This leads to earthquakes due to the forces of tension acting on the plates.

When this happens, the mantle is exposed and therefore there will be volcanic eruptions as the lava comes to the surface as magma. When this magma cools it creates new seafloors and underwater mountains.

Explanation:

Hey there!!!

As sound is a mechanical wave,it requires the medium to propagate. The most common waves are:

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The product among alcohol, gasoline, travel souvenirs, cigarettes that will have elastic demand is cigarettes.

Elastic demand refers to a situation in which a change in the price of a good or service results in a more significant change in the amount demanded. When the percentage change in quantity demanded is greater than the percentage change in price, the demand for the product is said to be elastic.

When the quantity demanded of a product decreases significantly when the price rises, the demand for the product is said to be elastic. Similarly, when a slight change in price causes a significant change in quantity demanded, the demand is said to be elastic. Conversely, if a product's price increases by a small percentage, and the demand for the product decreases by a smaller percentage, the demand for the product is said to be inelastic.

Cigarettes, of all the products listed above, are likely to have an elastic demand.

This is because smokers who are addicted to cigarettes are more likely to quit smoking or reduce their consumption in response to an increase in the price of cigarettes compared to the other goods.

Thus, a slight increase in the price of cigarettes is likely to cause a significant decrease in the number of cigarettes consumed.

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If the power produced by the sun decreases and the solar power/\(m^{2}\) at the earth drops by 10% to 1250 watts/\(m^{2}\), the surface temperature of the earth will depend on various factors .

The surface temperature of the earth will depend on various factors such as the amount of greenhouse gases in the atmosphere, cloud cover, and ocean currents. Assuming other factors remain constant, a decrease in solar power could lead to a decrease in the surface temperature of the earth. This is because less energy from the sun would be available to warm the planet. However, the decrease in temperature would not be significant enough to cause a catastrophic event as the earth has experienced variations in solar power throughout its history.

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Answer:

Ionic compounds conduct electricity when dissolved in water

Explanation:

Answer:

A

Explanation:

the formula ,

From the given chemical equations,the one with molar ratio with smallest difference between elemental sodium (Na) as a reactant and the chemical formed as a product is equation 'a'.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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