Prior to the industrial era, pre 1780 ___ affected earth climate because they emitter both aerosols and carbon dioxide into the atmosphere

A) sunspots
B) volcanoes
C) fossil fuels
D) meteorite impacts

It is also known as iteration. It is used mostly in computer programming with for and for each loops in which iteration is present. In mathematics there are some "interational operations" like product and sum for eg:

[tex]

J=\sum_{i=1}^{n}J_i\Longrightarrow J_1+J_2+\dots+J_{\infty}

[/tex]

The above equation describes the summation of J alike variables n times.

Answer:

The technique in which people use machines to learn how to control their bodies is known as D, Biofeedback.

Explanation:

Biofeedback is a variety of different machines that help people learn how to control their bodies depending on their specific needs, varying from things like scalp sensors, electrocardiographs, electromyographs and more.

Answer:

biofeedback

Explanation:

Answer:

It influences blood flow

Answer:

A prolapse is when the valve flaps bulges into the left atrium causing a leak. A prolapse can cause regurgitation. This is when the blood flow is backwards. Stenosis is when the aortic valve is narrowed. This blocks the oxygenated blood flow to the body.  

All of these problems effects a proper blood flow and if the flow isn't correct then body tissues that need oxygenated blood won't receive it properly.

1) Impulse: -32,000 kg m/s

The impulse acting on the car is equal to the change in momentum of the car:

[tex]I= \Delta p = m (v-u)[/tex]

where in this problem we have

m = 1000 kg is the mass of the car

v = 0 m/s is the final velocity of the car

u = 32 m/s is the initial velocity of the car

Substituting values into the equation, we find

[tex]I=(1000 kg)(0-32 m/s)=-32,000 kg m/s[/tex]

2) -4751 N

The impulse exerted on the car is also equal to the product between the average force, F, and the duration of the collision, t:

[tex]I=Ft[/tex]

where in this situation we know

[tex]I=-32,000 kg m/s[/tex] is the impulse

t = 7 s is the duration of the collision

Solving the formula for F, we find the average force:

[tex]F=\frac{I}{t}=\frac{-32,000 kg m/s}{7 s}=-4,571 N[/tex]

and the negative sign means that the force is in the opposite direction to the motion of the car.

Answer:

The speed of the light ray is halved

Explanation:

The index of refraction of a medium is the ratio between the speed of light in a vacuum (c) and the speed of light in the medium (v):

[tex]n=\frac{c}{v}[/tex]

For medium X, we have

[tex]n_x=\frac{c}{v_x}[/tex] (1)

For medium Y, we have

[tex]n_y=\frac{c}{v_y}[/tex] (2)

Dividing (1) by (2), we find

[tex]\frac{n_x}{n_y}=\frac{v_y}{v_x}[/tex] (3)

In this problem, the index of refraction of medium Y is twice as great as the index of refraction of medium X:

[tex]n_y = 2 n_x[/tex]

Substituting this into eq.(3), we get

[tex]\frac{n_x}{2n_x}=\frac{v_y}{v_x}\\v_y = \frac{v_x}{2}[/tex]

So, as a light ray travels from medium X into medium Y, the speed of the light ray is halved.

From the calculation, the speed of the light ray is halved.

The term refractive index refers to the ratio of the speed of light in one medium to the speed of light in another medium. We are told that the speed of light in medium Y is twice as great as the absolute index of refraction of medium X.

Let;

refractive index of X be nx

refractive index of y be ny

speed of light in x by vx

speed of light in y be vy

nx/ny = vx/vy

But ny = 2nx

nx/2nx =  vx/vy

1/2 =  vx/vy

vy = vx/2

Hence, we can see that the speed of the light ray is halved.

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Answer:

It increases and is perpendicular to the motion of the wave.

Explanation:

- A transverse wave is a wave in which the oscillation occurs in a direction perpendicular to the motion of the wave (example of transverse waves are electromagnetic waves)

- A longitudinal wave is a wave in which the oscillation occurs in a direction parallel to the motion of the wave (example of longitudinal waves are sound waves)

- The amplitude of a wave is defined as the maximum displacement of the wave relative to the equilibrium position, and the energy carried by the wave is proportional to the square of the amplitude:

[tex]E\propto A^2[/tex]

Therefore, as the amplitude of the wave increases, the energy increases as well.

Answer:

B. The drafts at each window may be different because the windows aren’t near each other.

Explanation:

The measurement is imprecise since the temperature will be lower in the window that receives the draft directly. that is, if the draft comes from the north, the north window will perceive lower temperatures than the south window.

Answer: B

Explanation: PLATO

Answer:Density-independent factors, such as weather and climate, exert their influences on population size regardless of the population's density. In contrast, the effects of density-dependent factors intensify as the population increases in size.

Explanation:

Answer:

Density independent.

Explanation:

Many factors which are physical or chemical in nature can influence the mortality of a population. They are occur by the inclusion of weather, natural disaster and pollution. A deer may be died in a forest due to fire and its chances of survival depends on the quantity of population density whether its high or low.

Density independent regulation can be affected by the various factors that affects the death rate or birth rates such as environmental factor and abiotic factors.

Answer: Because of presence of friction in most cases as friction exists in ever machine/body, so whenever it works, friction causes heat and sound energy as well, hence, proving that a system cannot be 100% efficient due to friction.

Answer:

1. Electric current

2. In fact it is electrons that flow through a metallic conductor, and they flow from the negative terminal to the positive terminal

3. Series and parallel

4. Series

5. Parallel

6.

7.

8.A fuse is a small, thin conductor designed to melt and separate into two pieces for the purpose of breaking a circuit in the event of excessive current. A circuit breaker is a specially designed switch that automatically opens to interrupt circuit current in the event of an overcurrent condition.

9.

10. The power of batteries in a circuit. The key functions of a battery and bulb in a circuit are explained. A battery is a source of energy which provides a push - a voltage - of energy to get the current flowing in a circuit. A bulb uses the electrical energy provided by the battery, but does not use current.

The flow of electrons through wires and components is known as electric current.

Electricity is defined as a form of energy occurring naturally due to motion and interactions of electrons.

Here,

1. The flow of electrons through wires and components is known as electric current. Or simply, electric current is the rate of flow of charge.

2. Since, the electrons are attracted to the positive terminal of the battery, they move from the negative to the positive terminal of the battery.

The direction of conventional flow of current is taken opposite to the flow of electrons. Thus electric current flows from positive terminal to the negative terminal of the battery. So, it is true.

3. The two main types of circuits are series and parallel.

4. The  type of circuit in which there is only one path for an electric current to flow is known as a series circuit.

5. The type of circuit would allow an electric current to continue to flow even if a single path is broken is a parallel circuit.

6. The diagram of a series circuit is attached.

7.  R' = 3 Ω  

 The equivalent resistance of the 4 resistors,

   R(eff) = 4R' = 4 x 3

   R(eff) = 12 Ω  

8. The purpose of fuses and circuit breakers is to protect equipment by stopping the flow of electric current.

9. The symbol represents the cell in a circuit diagram.

10. The purpose of a cell (battery) is to store chemical energy and transfer it to electrical energy when a circuit is connected.

Hence,

The flow of electrons through wires and components is known as electric current.

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Your question was incomplete. Attaching the image here.

Answer:

medium. A medium is the intervening substance through which impressions are conveyed to the senses or a force acts on objects at a distance.

They tend to be lustrous, ductile, malleable, and good conductors of electricity, while nonmetals are generally brittle (for solid nonmetals), lack lustre, and are insulators.

Answer:

The frequency, f, is 250 Hz. Hz is cycles per second. Hence a number divided by seconds.  

The wavelength, λ, is 1.5 m.  

The speed is v. Which is frequency times wavelength.  

v = f xλ  

Hence 250Hz*1.5m= 375 meters per second or 375 m/s

Explanation:

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Explanation:

The expression for the speed of the sound in terms of frequency and the wavelength is as follows;

[tex]v=\nu \lambda[/tex]

Here, v is the speed, [tex]\nu[/tex]  is the frequency of the wave and [tex]\lambda[/tex]  is the wavelength of the wave.

It is given in the problem that a sound wave has a frequency of 250 Hz and a wavelength of 0.35 m.

Calculate the speed of the sound wave.

[tex]v=\nu \lambda[/tex]

Put [tex]\nu= 250 Hz[/tex]  and [tex]\lambda= 0.35 m[/tex].

[tex]v=(250)(0.35)[/tex]

v= 87.5 m/s

Therefore, the speed of the sound wave is 87.5 m/s.

Answer:

Period of the wave: [tex]T = 0.4 \text{ seconds}[/tex]

Frequency of the wave: [tex]f = 2.5 \text{ Hz}[/tex]

Explanation:

Period of the wave:To calculate the period of a wave from a displacement vs time graph we identify the amount of time it takes for one cycle to be completed. According to the graph, 1 cycle is completed in 0.4 seconds, so:

[tex]T = 0.4 \text{ seconds}[/tex]

Frequency of the wave: To find frequency we simply calculate the inverse of the period because we know the relationship [tex]T= \frac{1}{f}[/tex] or [tex]f = \frac{1}{T}[/tex]

[tex]f= \frac{1}{T}= \frac{1}{0.4 s}= 2.5 \text{ Hz}[/tex]

Answer:

When we heat a solid, the energy supplied is used to increase the kinetic energy of its molecules, and thereby its temperature increases. ... From solid to liquid at melting point or from liquid to gas at boiling point) is termed as its latent heat.

Process:

A cooling curve is a line graph that represents the change of phase of matter, typically from a gas to a solid or a liquid to a solid. This is because the matter has more internal energy as a liquid or gas than in the state that it is cooling to.  

The initial point of the graph is the starting temperature of the matter, here noted as the "pouring temperature". When the phase change occurs there is a "thermal arrest", that is the temperature stays constant. This is because the matter has more internal energy as a liquid or gas than in the state that it is cooling to. The amount of energy required for a phase change is known as latent heat. The "cooling rate" is the slope of the cooling curve at any point.

Your answer should be “1.”

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Recycling aluminum cans conserves Earth's resources by requiring up to 95% less energy than producing new aluminum from bauxite ore. This energy-saving equates to significant conservation of gasoline and reduces harmful greenhouse gas emissions, thus benefiting the environment. Option 1 is correct .

One positive effect of recycling aluminum cans is conserving Earth's resources [ option 1 ] . Recycling is highly beneficial to the environment and is an important aspect of sustainability. When it comes to the recycling of aluminum, it is significantly more energy and resource-efficient compared to extracting and processing new aluminum from ore.

Producing new aluminum from bauxite ore requires temperatures above 900°C and a large amount of electricity. In sharp contrast, recycling aluminum requires up to 95% less energy than producing primary aluminum. This huge energy savings can be equated to the amount of energy in gasoline. For example, recycling just 40 aluminum cans can save the same amount of energy found in one gallon of gasoline. With this simple act, if all the aluminum cans used were to be recycled, it would result in an enormous energy conservation, potentially saving billions of gallons of gasoline each year.

Overall, the process of recycling aluminum not only conserves energy but also reduces the need for raw material extraction, which in turn protects ecosystems from potentially damaging mining operations. As such, recycling aluminum also aids in reducing greenhouse gas emissions, which contributes to mitigating global warming and climate change.

Answer:

What is the difference between Transverse and Longitudinal waves? Transverse Waves: Displacement of the medium is perpendicular to the direction of propagation of the wave. ... Longitudinal Waves: Displacement of the medium is parallel to the direction of propagation of the wave.:

In transverse waves, displacement of the medium is perpendicular to the direction of propagation of the wave while in longitudinal waves, displacement of the medium is parallel to the direction of propagation of the wave.

A sound wave is a result of compression and rarefaction, by which sound is propagated in a material medium such as air.

A sound wave can't be propagated without medium. Sound doesn't travel in vacuum.

When displacement of the medium is perpendicular to the direction of propagation of the wave is called transverse waves.

When displacement of the medium is parallel to the direction of propagation of the wave is called longitudinal waves.

Thus, the difference is only due to the direction of propagation.

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Answer:

Resistance increases with length because the electrons have further to go, so suffer greater collisions with atoms in the material. Look at these wires: Electrons moving through the short wire only feel resistance for a short time compared to the longer one. This means its resistance is less.

Explanation:

Answer:

A longer length leads to a higher resistance

Explanation:

You just said "constant speed", and "straight line" which means constant direction.

"Acceleration" means any change of speed or direction of motion.  Since neither of those is changing, no acceleration is happening.

Acceleration is the rate of change of velocity. Constant velocity, means there is no change in velocity and hence the plane is not accelerating.

Velocity is a physical quantity used to measure the distance traveled per unit time. Thus, velocity is the ratio of distance to the time of travel. Velocity is a vector quantity and it is expressed in the units m/s, km/h, miles/hr, ft./s etc.

The rate of change of velocity is called acceleration. Acceleration is also a vector quantity thus having both magnitude and direction. As change in velocity per time difference is the acceleration and it is expressed in the unit m/s².

Here, the plane is moving through  a straight line at a constant speed of 500 mph. Thus no change in velocity indicates the plane is not accelerating in any direction.

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There are two conditions necessary for total internal reflection, which is when light hits the boundary between two mediums and reflects back into its original medium:

Light is about to pass from a more optically dense medium (slower) to a less optically dense medium (faster).

The angle of incidence is greater than the defined critical angle for the two mediums, which is given by:

θ = sin⁻¹([tex]n_{fast}[/tex]/[tex]n_{slow}[/tex])

Where θ = critical angle, [tex]n_{fast}[/tex] = refractive index of faster medium, [tex]n_{slow}[/tex] = refractive index of slower medium.

Choice C gives one of the above necessary conditions.

Answer:

C. Light in a medium is incident on a boundary with a faster medium.

Explanation:

Answer:

CaCo3 contains carbon, oxygen and calcium.

Explanation:

Calcium carbonate (CaCO3) is a compound made up of calcium, carbon, and oxygen in a 1:1:3 ratio. It consists of a metal (calcium) and nonmetals (carbon and oxygen), and is an example of an inorganic compound commonly found in materials like cement.

The compound calcium carbonate is represented by the formula CaCO3. It is a compound, not an element, because it is made up of more than one type of atom chemically bonded together. The elements found in this compound are calcium, carbon, and oxygen.

In the chemical formula of calcium carbonate, the ratio of calcium (Ca) to carbon (C) to oxygen (O) atoms is 1:1:3, indicating that there is one calcium atom, one carbon atom, and three oxygen atoms.

The names of these substances are as follows:

The names of the compounds listed are:

Inorganic compounds often consist of a metal and nonmetals. For instance, calcium carbonate involves the metal calcium and the nonmetals carbon and oxygen.

The compound names for the given chemical formulas are:

Hey there!

Biotic factors are living organisms. This includes plants, animals, and bacteria. Climate, water, and natural disasters are abiotic factors, which means they are nonliving factors that affect the environment. Disease is caused by bacteria, which is a biotic factor.

Therefore, your answer is B) Disease.

Hope this helps!

Answer:

the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.

Explanation:

Answer :

curcuit and Source of current .

Answer: you have to have a source of electricity because if not you are not gonna get a "eletrical" current

The Ptolemaic model of the universe describes the Earth as  being at the center, stationary, with the Sun, the Moon, other planets, stars, and EVERYTHING rotating around it. (B)

Answer:

B. At the center, stationary, with planets that rotate around it

Explanation:

The Ptolemaic model is also known as geocentric model. Ptolemy and Aristotle proposed the Earth to be center of the universe and every other body (planets, moons, stars and sun) to be revolving about in concentric orbits. They considered Earth to be stationary. The observation that the sun seemed to revolve about earth every 24 hours and that the observer on the earth cannot sense motion of Earth supported this model.

Answer:

a.

Explanation:

Alkali metals, including elements like sodium and potassium, are extremely reactive due to each having a single valence electron in their outermost shells. This electron is easily removed to form a relatively stable, singularly positive ion, thus making them highly reactive.

Alkali metals, being part of Group 1 of the periodic table, are known for their high reactivity due to their atomic structure. This family includes elements like sodium and potassium. They all share an atomic feature which is having a single valence electron in the outermost shell (s electron in ans configuration). This specific feature is what makes alkali metals highly reactive.

The single valence electron is loosely held by the atom and can be easily removed. When this happens, the alkali metal atom forms a relative stable and singularly positive ion (cation). The ease of losing this valence electron, paired with the large atomic radii and the lowest first ionization energy in their periods, gives alkali metals their characteristic high reactivity.

A common trait within the group is that the reactivity increases with higher atomic numbers due to the decreasing ionization energy. In contrast to alkali metals, alkaline earth metals of Group 2 have a completed s subshell in outermost shell, making them less reactive, but still amongst the most reactive elements.

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Answer:

EFFECTS: ( doughts)

EFFECTS:( FLOODS)

How to prevent from flooding is :

How to prevent from droughts :

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Answer:

im not smart enough, all i figured out is the track is going 1.2 miles every minute

Explanation:

Answer:

43.4 s

Explanation:

First of all, we can find the acceleration of the train by using the equation:

[tex]v^2 -u^2 = 2ad[/tex]

where

v = 39.9 m/s is the final speed

u = 18.2 m/s is the initial speed

a is the acceleration

d = 1250 m is the distance covered

Solving for a,

[tex]a=\frac{v^2-u^2}{2d}=\frac{(39.9 m/s)^2-(18.2 m/s)^2}{2(1250 m)}=0.50 m/s^2[/tex]

And now we can fidn the time taken, by using the formula:

[tex]a=\frac{v-u}{t}\\t=\frac{v-u}{a}=\frac{39.9 m/s-18.2 m/s}{0.50 m/s^2}=43.4 s[/tex]

1. The vertical columns on the periodic table are called groups or families because of their similar chemical behavior.

2. All the members of a family of elements have the same number of valence electrons and similar chemical properties.

3. The horizontal rows on the periodic table are called periods.