Mauna loa, a volcano in hawaii, is an excellent example of a ________.

The phenomenon created by two tuning forks, side by side, emitting frequencies which differ by only a small amount is called (d) beats. This phenomenon is a result of the interference of sound waves produced by the two tuning forks.

When two sound waves with slightly different frequencies meet, they interfere with each other, causing a periodic variation in sound intensity. This variation in sound intensity is perceived as a beat frequency. The beat frequency is equal to the difference between the frequencies of the two tuning forks.

The closer the frequencies of the two tuning forks are to each other, the slower the beat frequency will be. As the frequency difference between the two tuning forks increases, the beat frequency will become faster.

The phenomenon of beats has many practical applications. One of the most common applications is in music. Musicians use beats to tune their instruments. By listening to the beats produced by two tuning forks, they can adjust the pitch of their instrument to match the desired frequency.

Beats are different from other sound phenomena, such as resonance and the Doppler effect. Resonance occurs when an object vibrates at its natural frequency in response to an external stimulus. The Doppler effect is the change in frequency of a wave in relation to the observer's motion.

In conclusion, the phenomenon created by two tuning forks, side by side, emitting frequencies which differ by only a small amount is called beats. This phenomenon is caused by the interference of sound waves produced by the two tuning forks and has practical applications in music and acoustics. Beats are different from other sound phenomena such as resonance and the Doppler effect.

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The wavelength released in transition energy is 683.68 nm.

We need to know about transition energy to solve this problem. Electrons in a hydrogen atom can move to another level of energy. It is also called a transition. In this process, electrons will absorb or release their energy to move. The transition energy can be determined as

ΔE = E2 - E1

where ΔE is transition energy, E2 is the final state of energy and E1 is the initial state of energy.

The state energy of a hydrogen atom can be calculated by

E = -(13.6) / n² eV

E = h.c / λ

where n is the number of energy states, h is Planck constant (4.136 x 10¯¹⁵ eV/Hz), c is speed of light (3 x 10⁸ m/s) and λ is wavelength.

Rydberg has been simplified how much wavelength released or absorbed by this equation

1/λ = R (1/n1 - 1/n2)

where R is Rydberg constant (1.097 × 10⁷ /m)

From the question above, we know that

n1 = 3

n2 = 5

By substituting the following parameter, we get

1/λ = R (1/n1 - 1/n2)

1/λ = 1.097 x 10⁷(1/3 - 1/5)

1/λ = 146266.67

λ = 6.8368 x 10¯⁷ m

λ = 683.68 nm

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Answer:20Hz to 20000Hz

Explanation:

Humans can detect sounds in a frequency range from about 20 Hz to 20 kHz.

Answer:

So Nessa went so fast it made her pass the tile in a second. Lets take a look at this problem, It says "the" tile so we should assume that it means 1 tile. Then draw a diagram representing that tile then you should have your problem finished. Hope that helped and I'm willing to help if you have anymore questions!

Explanation:

Answer:The maximum height you could jump on the moon with a velocity of 3 m/s is 4.5 meters.

Explanation:

To calculate the maximum height that you could jump on the moon, you can use the following formula:h = (v^2) / (2 * g)where h is the maximum height, v is the initial velocity, and g is the acceleration due to gravity. On the moon, g is approximately 1.6 m/s^2. Substituting the values, we get:h = (3^2) / (2 * 1.6) = 4.5 m

So the maximum height you could jump on the moon with a velocity of 3 m/s is 4.5 meters.

Power generation technologies such as coal-fired power plants nuclear reactors and wind turbines offer various strengths and weaknesses to power generation companies and their customers.

Renewable Energy Technologies is an umbrella term for energy production from renewable sources such as solar wind, hydro hydroelectric tidal biomass biofuels, and waste and geothermal. In my opinion, the most important technical need related to energy is to make energy sources cheaper safer, and more socially acceptable.

This is reflected in an inexhaustible resource that is environmentally friendly and cheap to process to generate energy. Renewable energy sources play an important role in ensuring sustainable energy with low emissions. It is already recognized that renewable energy technologies can significantly meet power demand and reduce emissions. The country has developed sustainable methods for its energy supply in recent years.

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The forces in members ab and cb are 4 kN (compression) and 2.3094 kN (tension), respectively.

Given, θ = 30°; Load P = 4 kN
Let's find out the force in member AB:
As the load P is applied at joint B, the horizontal force in member AB will be equal to the force P. Thus,
HAB = P = 4 kN
Now, to find out the force in member CB, let's resolve forces horizontally and vertically at joint B.
Horizontal equilibrium: HCB - P = 0
HCB = P = 4 kN
Vertical equilibrium: VCB - HAB * tanθ = 0
VCB = HAB * tanθ = 4kN * tan30°
VCB = 2.3094 kN
Now, let's resolve forces at joint C.
Vertical equilibrium: VCA - VCB - 2 kN = 0
VCA = VCB + 2 kN
VCA = 2.3094 kN + 2 kN
VCA = 4.3094 kN
The forces in members AB and CB are 4 kN and 2.3094 kN, respectively.
Members AB and CB are in compression and tension, respectively.
Thus, the forces in members ab and cb are 4 kN (compression) and 2.3094 kN (tension), respectively.

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Answer:

5 m

Explanation:

We'll begin by calculating the original potential energy. This can be obtained as follow:

Mass (m) = 0.2 Kg

Height (h) = 20 m

Acceleration due to gravity (g) = 10 m/s²

Energy (E₀) =?

E₀ = mgh

E₀ = 0.2 × 10 × 20

E₀ = 40 J

Next, we shall determine the new energy of the ball.

Energy (E₀) = 40 J

Energy lost (Eₗ) = 30 J

New energy (E) =?

E = E₀ – Eₗ

E = 40 – 30

E = 10 J

Finally, we shall determine height of the ball on rebound. This can be obtained as follow:

New energy (E) = 10 J

Mass (m) = 0.2 Kg

Acceleration due to gravity (g) = 10 m/s²

Height (h) =?

E = mgh

10 = 0.2 × 10 × h

10 = 2 × h

Divide both side by 2

h= 10 / 2

h = 5 m

Thus, the height of the ball on rebound is 5 m

"Endurance" is the capacity to perform tasks for longer than a few minutes. Endurance, which typically refers to aerobic capacity, is the capacity to maintain an activity for prolonged periods of time.

Endurance, which typically refers to aerobic capacity, is the capacity to maintain an activity for prolonged periods of time.

The more repetitions you could perform, the stronger your muscle endurance was.

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The required apparent frequency is F₀ = 1389.47 Hz

When a wave source and its observer move in close proximity to one another, the phenomenon known as the Doppler Effect occurs. Doppler, Christian Johann's discovery, is the process by which starlight increases or decreases depending on the relative motion of the star.

The Doppler effect occurs because each wave's crest emerges from a location that is closer to the observer than the crest of the previous wave when the wave source is moving in the direction of the observer.

According to the Doppler's Effect of sound waves :

F₀ = \(\frac{FV}{V-V_{0} }\)

where : F₀ = the apparent frequency

V = is the sound of a sound wave

F = is the actual frequency of sound

V₀ = is the source velocity

Substituting the values in the formula :

F₀ = \(\frac{580 X 55.1}{55.1 - 32.1}\)

F₀ = \(\frac{31,958}{23}\)

F₀ = 1389.47 Hz

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Answer:

Is the "1 cm deep?" correct?  1 km??  I'll assume cm is correct.

Explanation:

(Velocity)*(Time) = Distance.

We want the time, t.

(1540m/sec)(t) = 1cm

By definition, 1 m = 100cm

Conversion factor:  (1m/100cm)

Therefore 1 cm = 0.010 m

(1540m/sec)(t) = 0.010 m

t = (0.010 m)/(1540m/sec))

t = 1.0x10^-2m/(1.54x10^3m/sec)

t = 6.5x10-6 seconds, or 6.5 microseconds

It will take 0.000012987 seconds or 12.987 microseconds for sound to travel to and from the target.

Given:

Average speed of sound = 1540 m/s

Depth of the target = 1 cm = 0.01 m

The total distance sound travels is twice the depth of the target.

Total distance = 2 × Depth of the target

= 2 × 0.01

= 0.02 m

The time it takes for sound to travel to and from the target using the formula:

Time = Distance ÷ Speed

Time = 0.02 ÷ 1540

Time =  0.000012987 s

So, it will take 12.987 microseconds for sound to travel to and from the target.

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Saussure is to structuralism as James is to functionalism. Ferdinand de Saussure is considered the founder of structuralism, which focuses on the structure of language and its underlying systems.

His work emphasized the analysis of language elements and their relationships within a system. William James, on the other hand, is associated with functionalism, a psychological approach that emphasizes the functions and purposes of mental processes. James believed that the mind should be studied in terms of its adaptive functions and how it helps individuals interact with their environment.Saussure is to structuralism as James is to functionalism. Ferdinand de Saussure is considered the founder of structuralism, which focuses on the structure of language and its underlying systems.

In summary, Saussure's work laid the foundation for structuralism by analyzing language structure, while James contributed to functionalism by emphasizing the adaptive functions of the mind.

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Answer:

I would say the smaller object.

Explanation:

In any case, thermal energy can be spread throughout the object easier, and quicker, rather than the bigger object.

For example: You are boiling two pots of water, let's suppose Pot A has twice as much as Pot B:

|--------------------- |              |                            |

|                          |              |----------------------- |

|_____________|              |______________|

Pot A                                 Pot B

If you boil them at both the same time, temperature, and continue that for sometime, your results will be that Pot B will have risen in temperature alot faster than Pot A

The comparison:

Pot A and Pot B's Amount of water - Supposed to be the different size of the objects

Stove/Boiling: Would be if thermal heat were to enter the objects at the same temperatures.

Answer:

The velocity with which the 5.0 kg dog has to run to have the same momentum as the 30 kg pig walking at 3.0 m/s is 18 m/s

Explanation:

Given that the mass of the dog = 5.0 kg

The mass of the pig = 30 kg

The speed with which the pig is walking = 3.0 m/s

We have that linear momentum = Mass × Velocity

Therefore, the momentum of the pig, m₁ = 30 kg × 3.0 m/s = 90 kg·m/s

m₁ = 90 kg·m/s

The momentum of the dog m₂ = Mass of the dog × Velocity of the dog

Given that m₁ is to be equal to m₂, we have;

m₁ = 90 kg·m/s = m₂ = Mass of the dog × Velocity of the dog

90 kg·m/s = m₂ = 5.0 kg × Velocity of the dog

m₂ = 5.0 kg × Velocity of the dog = 90 kg·m/s

5.0 kg × Velocity of the dog = 90 kg·m/s

Velocity of the dog = 90 kg·m/s/(5.0 kg) = 18 m/s

The velocity with which the 5.0 kg dog has to run to have the same momentum as the 30 kg pig walking at 3.0 m/s = 18 m/s.

The horizontal force applied to the box to cause it to start sliding along the surface  is 111.72 N.

Force can be defined as the product of mass and acceleration.

To calculate the horizontal force that must be applied. we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the horizontal force applied to the box is 111.72 N.

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The anion radius is approximately 0.092 nm

To find the anion radius, we can use Coulomb's law, which states that the force of attraction between two charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. In this case, the force of attraction between the divalent cation and divalent anion is given as 1.50 x 10^-8 N.

The charge of a divalent cation is 2+, and the charge of a divalent anion is 2-. Therefore, the product of their charges is (2)(2) = 4.

Now, we can use Coulomb's law to calculate the anion radius:

Force of attraction = (k * (charge of cation) * (charge of anion)) / (distance^2)

1.50 x 10^-8 N = (k * 4) / (distance^2)

Now, we need to find the value of the constant k. It is equal to 8.99 x 10^9 Nm^2/C^2.

1.50 x 10^-8 N = (8.99 x 10^9 Nm^2/C^2 * 4) / (distance^2)

To find the anion radius, we need to rearrange the equation to solve for distance:

distance^2 = (8.99 x 10^9 Nm^2/C^2 * 4) / (1.50 x 10^-8 N)

distance^2 = (35.96 x 10^9 Nm^2/C^2) / (1.50 x 10^-8 N)

distance^2 = 2397.33 x 10^17 m^2/C^2/N

Now, we can solve for the anion radius by taking the square root of both sides:

distance = √(2397.33 x 10^17 m^2/C^2/N)

Plugging in the given values, we get:

distance = √(2397.33 x 10^17 m^2/C^2/N)

distance ≈ √(23.97 x 10^18 m^2/C^2/N)

distance ≈ √(2.397 x 10^19 m^2/C^2/N)

distance ≈ √(2.397) x √(10^19) m/C√N

distance ≈ √2.397 x 10^9 m/C√N

Finally, we convert the distance from meters to nanometers:

distance ≈ √2.397 x 10^9 m/C√N

distance ≈ √2.397 x 10^9 m/C√N x (10^9 nm/1 m)

distance ≈ (√2.397 x 10^9 x 10^9) nm/C√N

distance ≈ √(2.397 x 10^18) nm/C√N

distance ≈ √2.397 x 10^9 nm/C√N

Therefore, the anion radius is approximately 0.092 nm.

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Taking the square root of both sides, we find that the anion radius, r, is equal to the square root of (599.33 × \((q^2)\)).

The force of attraction between a divalent cation and a divalent anion is given as 1.50 x\(10^{-8\) N. We can use Coulomb's Law to solve for the anion radius. Coulomb's Law states that the force of attraction between two charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

The equation for Coulomb's Law is F = k × (q1 × q2) /\(r^2\), where F is the force of attraction, k is the electrostatic constant, q1 and q2 are the charges of the two particles, and r is the distance between them.

In this case, since the charges of the cation and anion are equal in magnitude, their product can be written as \(q^2\). Also, we can substitute the given force value of 1.50 x \(10^{-8\) N.

Therefore, the equation becomes 1.50 x \(10^{-8\) N = k × \((q^2) / r^2\).

To find the anion radius, we need to rearrange the equation to solve for r. Rearranging, we get \(r^2\) = k × (q^2) / (1.50 x\(10^{-8\) N).

Now, we can substitute the known values into the equation. The electrostatic constant, k, is approximately 8.99 x\(10^9 Nm^2/C^2.\)
Let's assume the radius of the cation is 0.092 nm, which is equal to 0.092 x \(10^{-9\) m.

Substituting the values, we have \(r^2\) = (8.99 x \(10^9 Nm^2/C^2\)) * (\(q^2\)) / (1.50 x\(10^{-8\)N).

Simplifying the equation further, we get \(r^2\) = 599.33 × (\(q^2\)).

Finally, taking the square root of both sides, we find that the anion radius, r, is equal to the square root of (599.33 × (\(q^2\))).

Therefore, the anion radius is dependent on the charge of the ion, q. To calculate the specific value, we need additional information about the charge of the ion.

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Answer: Conductor, semiconductor, insulator

Explanation:

Just did the quiz

The correct option is option A.

The descending order in which electrons flow easily is:

Conductor, semiconductor, insulator

The correct order for materials by their ability to allow the flow of electrons, from most easily to least easily is Conductor, semiconductor, insulator.

Conductors are generally metals, they have plenty of free electrons due to which the electron flow is easy. Also, the conduction band and valance band in a conductor overlap, so they can conduct at room temperature.

In the case of semiconductors, the band gap between the conduction band and valance band is almost 1eV, so a little energy is enough to make the flow of electrons possible

Whereas, in insulators, the band gap is quite high and electrons can not jump from the conduction band to the valence band due to which the flow of electrons is not possible.

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Answer:

74 km

Explanation:

Ler the position of markers be A,B, and C for notation 246 km, 172 km, and 147 km respectively. John's whole journey has been shown in the figure.

As given,his initial position was the point A. At first, he travelled from the point A to C, then he traveled back from the point C to B on the straight path. His final position is at the point B.

The resultant displacement equals to the shortest distance between the final and the initial positions.

So, the magnitude of the resultant displacement is |172-246| km=74 km and the direction is towards point B from point A.

At equilibrium, the forces exerted by the front and back hooves must be equal, but the force exerted by the front hooves will be slightly greater than that of the back hooves.

What is equilibrium?
Chemical equilibrium refers to the situation inside a chemical reaction where both the reactants are present at levels that have no further habit of changing over time, preventing any discernible change in the system's properties. Whenever the forward reaction and the reverse reaction move forward at the same speed, this condition results. The forward as well as backward reactions typically have equal, if not zero, reaction rates. The concentrations of a products and reactants do not change on a net basis as a result. Dynamic equilibrium is the name given to such a situation.

This is due to the fact that the horse's center of gravity is closer to the front hooves, and thus the front hooves must exert a greater force in order to keep the horse balanced.

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The resulting changes will be:

1. Pressure head: 88 ft (or 26.82 m)

2. Effective stress: No change, assuming no other factors affect it

3. Fluid pressure: No change

4. Total stress: Decreased by the same amount as the effective stress

To calculate the effective stress in the aquifer, we need to subtract the fluid pressure from the total stress.

Given:

Pressure head in the aquifer = 100 ft (or 30.48 m)

The pressure head in the aquifer is directly proportional to the fluid pressure, which can be calculated using the formula:

Fluid pressure (P) = ρ * g * h

Where:

ρ = density of the fluid (water) = approximately 1000 kg/m³

g = acceleration due to gravity = 9.8 m/s²

h = pressure head

Fluid pressure = 1000 kg/m³ * 9.8 m/s² * 30.48 m ≈ 298,440 N/m² (or Pa)

The total stress in the aquifer is the sum of the fluid pressure and the effective stress. Therefore, the effective stress can be calculated by subtracting the fluid pressure from the total stress.

Now, let's consider the changes in the hydraulic head due to pumping:

Change in hydraulic head = -12 ft (or -3.66 m)

The resulting changes in each parameter will be as follows:

1. Pressure head:

The pressure head will be reduced by 12 ft, so the new pressure head will be 100 ft - 12 ft = 88 ft (or 26.82 m).

2. Fluid pressure:

The fluid pressure does not change, as it depends on the density of the fluid and the acceleration due to gravity, which remain constant.

3. Effective stress:

The effective stress can be calculated as the total stress minus the fluid pressure. Since the fluid pressure remains constant, the effective stress will also remain constant unless there are other factors affecting it.

4. Total stress:

The total stress is the sum of the fluid pressure and the effective stress. As mentioned earlier, the fluid pressure remains constant, so the total stress will decrease by the same amount as the effective stress, assuming no other factors affect the total stress.

Therefore, the resulting changes will be:

1. Pressure head: 88 ft (or 26.82 m)

2. Effective stress: No change, assuming no other factors affect it

3. Fluid pressure: No change

4. Total stress: Decreased by the same amount as the effective stress

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Hydroelectric energy is generated by capturing the energy of flowing water. As water flows through a turbine, the blades of the turbine spin and generate electricity.

Wind energy is generated by capturing the kinetic energy of the wind. As wind passes through the turbine, the blades spin and generate electricity.

Geothermal energy is generated by harnessing the natural heat of the Earth’s core. Heat from the Earth’s core is used to generate steam, which is then used to spin a turbine and generate electricity.

Parabolic solar collection is a method of collecting the sun’s energy using large reflective mirrors. The mirrors focus the sunlight onto a central point, which is then used to spin a turbine and generate electricity.

Thus, all of these power sources rely on spinning turbines connected to a generator to produce electricity.

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The terminal velocity of the 64 kg and the 93 kg skydiver are 102.85 m/s and 123.983 m/s respectively.

The formula for the terminal velocity of a falling object or person is

V = √(2mg/ρCA), where m is the mass of the object, g is the acceleration due to gravity, ρ is the density of the fluid (air in this case), A is the frontal area, and C is the drag coefficient.

Given: masses of the skydiver, m₁ =64 kg, m₂ = 93 kg.

the altitude of airplane h = 5950 m,

the density of air, ρ = 1.21 kg/m³

Drag coefficient, C = 0.7

Frontal area, A = 0.14 m²

putting all the values in the formula for terminal velocity, we get

V1 =  √(2×64×9.8/(1.21 × 0.7 × 0.14)) = 102.85 m/s

V2= √(2×93×9.8/(1.21 × 0.7 × 0.14)) = 123.983 m/s

Therefore, the terminal velocities of the 64 kg and the 93 kg skydiver are 102.85 m/s and 123.983 m/s respectively.

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Answer:

Valence electrons are outer shell electrons with an atom and can participate in the formation of chemical bonds. In single covalent bonds, typically both atoms in the bond contribute one valence electron in order to form a shared pair. The ground state of an atom is the lowest energy state of the atom.

Answer:

Explanation:

Gneiss is a high grade metamorphic rock, meaning that it has been subjected to higher temperatures and pressures than schist. However, unlike slate and schist, gneiss does not preferentially break along planes of foliation because less than 50% of the minerals formed during the metamorphism are aligned in thin layers.

The block and table have a sliding friction coefficient of 0.083.

Although friction is assumed to be created by the interaction between the microscopic bumps on surfaces when they brush against each other, scientists are not entirely sure what causes it. It is challenging for the surface to slide over one another because the spikes on each surface flex and exert stress on one another.

The friction between both the edges can be decreased by using lubricants like oil or grease. Friction can be decreased by cleaning the surface, which makes it smooth.

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1. Five major external forces that affect organizations are economic, social, cultural, demographic, and technological. Economic factors such as inflation and interest rates can impact a company's profitability and purchasing power. Social factors like changing consumer preferences and lifestyles can influence demand for products and services.

Cultural factors like values and beliefs can shape consumer behavior and market trends. Demographic factors such as population size and age distribution can affect target markets.

Technological factors like advancements in automation or digitalization can disrupt industries and create new opportunities. These external forces shape the business environment and organizations must monitor and adapt to them to stay competitive.

2. Gathering competitive intelligence is crucial for businesses because it provides valuable insights about their competitors' strategies, strengths, weaknesses, and market position.

By understanding the competitive landscape, businesses can identify opportunities and threats, make informed decisions, and develop effective strategies.

Competitive intelligence helps businesses stay ahead of their competitors, anticipate market trends, identify emerging technologies, and improve their own products or services. It allows businesses to benchmark their performance, evaluate their competitive advantage, and identify areas for improvement.

Ultimately, gathering competitive intelligence empowers businesses to make proactive and strategic decisions that can lead to sustainable growth and competitive advantage.

3. In business, various economic variables need to be monitored as they have significant impacts on strategy applications. Some important economic variables include GDP (Gross Domestic Product), inflation rate, exchange rates, interest rates, consumer spending, unemployment rate, and industry-specific factors like raw material prices or energy costs.

Monitoring these variables helps businesses understand the overall economic conditions, identify market opportunities, and assess potential risks. For example, a high inflation rate may impact pricing strategies, while a favorable exchange rate can benefit export-oriented businesses.

By monitoring economic variables, businesses can adapt their strategies accordingly and make informed decisions to navigate the dynamic business environment.

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The speeds of the vertically launched sphere and horizontally launched sphere will not necessarily be the same when they hit the floor, even if they are launched from the same height and at the same initial speed.

When a sphere is launched vertically upwards, it will slow down due to the force of gravity acting against it, until it reaches the highest point of its trajectory and momentarily stops. Then, it will accelerate back downwards towards the ground, increasing in speed until it hits the floor. The speed at which it hits the floor will depend on its initial speed, the height it was launched from, and the acceleration due to gravity.

On the other hand, when a sphere is launched horizontally, it will continue to move at a constant speed in the horizontal direction, while also being accelerated downwards due to the force of gravity. The resulting motion is a projectile motion with a parabolic trajectory. The speed at which it hits the floor will depend on its initial horizontal speed, the height it was launched from, and the acceleration due to gravity.

Therefore, the speeds of the vertically and horizontally launched spheres when they hit the floor will depend on a variety of factors and cannot be determined without more information about the specific conditions of the launches.

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Answer:

Yes

Explanation:

Thus, as a plate moves over the location of a plume eruption, it carries successively older volcanoes with it. As hotspot volcanoes are transported by plate motion away from the mantle plume, hotspot volcanism ceases. Eventually the hotspot volcanoes become extinct, gradually subside, and are eroded by wave action.

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Answer:

yes

Explanation:

Thus, as a plate moves over the location of a plume eruption, it carries successively older volcanoes with it. As hotspot volcanoes are transported by plate motion away from the mantle plume, hotspot volcanism ceases. Eventually the hotspot volcanoes become extinct, gradually subside, and are eroded by wave action.

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The energy the earth receives from the sun in one hour is enough energy to meet worldwide demand for a year

It is possible to change the form of energy. For instance, the body of a person can store chemical energy from food until that person uses it as kinetic energy during labor or play. The kinetic energy of moving water in rivers and the chemical energy held in coal and natural gas can be turned to electrical energy, which can then be transferred to light and heat.

In terms of working energy, these can be classified into two categories:

potential or reserve power

working force or kinetic energy

Energy is the potential for doing labour. Modern civilisation is made possible by the capacity to convert energy between different forms and use it to complete activities. People use energy to move around on foot and by bicycle, operate cars on land and in the sea, cook food on stoves, make ice in freezers, light up our homes and offices, make things, and send people into space.

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