Ken’s community is completely dependent on agriculture for their income. They cultivate and breed domestic species for their food. Ken lives in which society?
A.
hunter-gatherer
B.
modern
C.
primitive
D.
agrarian

Answer:

x=10, y=5

Explanation:

-4x + 11y = 15

x = 2y

Use substitution:

-4(2y) + 11y = 15

-8y + 11y = 15

3y = 15

y = 5

Now find x:

x = 2y

x = 2(5)

x = 10

Answer:

C 35 km , is the answer

Explanation:

d=55 - 20 = 35

Answer:64l.biggs on ig

Explanation:

Answer:

the correct answer is a)

Explanation:

The changes from wave A to wave B can be explained by the difference in their characteristics. Line A is a decreasing line, and line B is an increasing line, with line A being much steeper than line B.

The changes from wave A to wave B can be explained by the difference in their characteristics. Line A is a decreasing line, indicating a decrease in amplitude or intensity, while line B is an increasing line, indicating an increase in amplitude or intensity. The steepness of line A is greater than that of line B. This change in amplitude and steepness represents the change from wave A to wave B.

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Answer:

Explanation:

Stars are massive objects that have a large gravitational field, which drives the star to contract on itself, which is why fusion occurs: in the center of the star the nuclei of atoms are already so close due to gravity and high temperatures that bind. This is what is called nuclear fusion and is the energy source of a star.

On the other hand yes, the main elements of a star are hydrogen and helium (two hydrogen nuclei fuse to make helium), this makes the star mainly a huge ball of gas so there is no solid surface where you can stand on.

And about water on a star, that is not possible. Temperatures on stars are very vey high that watter could not exist in a liquid form on them.

Stars produce energy through nuclear fusion.

Stars are massive objects composed of gas.

Stars are made primarily of hydrogen as well as helium.

Therefore,  statements that  describe properties of stars here Stars produce energy through nuclear fusion is that Stars are been regarded as  massive objects  which is encompassed  gas.

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Answer:

yes, I would believe so.

Explanation:

Acelerating means moving, picking up speed...etc and well he is being pushed so he's moving.

Hope my answer has helped you!

Answer:

A. sonography and fluoroscopy (I just took the edg quiz)

The imaging techniques capture real-time images will be sonography and fluoroscopy.

Sonography is a diagnostic medical procedure that uses high-frequency sound waves (ultrasound) to produce dynamic visual images of organs, tissues or blood flow inside the body. This type of procedure is often referred to as a sonogram or ultrasound exam.

fluoroscopy simply serves as an image-guidance tool, and as such, alternative imaging modalities that do not rely on ionizing radiation can and should be considered. For example, as a real-time, high-resolution imaging modality, ultrasound shares many characteristics with fluoroscopy.

However, due to its lack of reliance on ionizing radiation, ultrasound is often the imaging tool of choice for a number of image-guided interventions for which fluoroscopy may also be considered, particularly in the pediatric population.

Hence the imaging techniques capture real-time images will be sonography and fluoroscopy.

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Answer:

B) 2.2 Ω

Explanation:

First of all, we should notice that the resistor placed between A and B is short-circuited. In fact, the current from point A will follow the wire above between A and C (which has zero resistance), so we can basically ignore the presence of the resistor between A and B, since it has no effect on the circuit.

Then, we can notice that the two resistors between CB and CD are in parallel to each other; therefore, their equivalent resistance is given by:

[tex]\frac{1}{R}=\frac{1}{R_{BC}}+\frac{1}{R_{CD}}=\frac{1}{4.0 \Omega}+\frac{1}{5.0 \Omega}=\frac{9}{20 \Omega}\\R= \frac{20 \Omega}{9}=2.2 \Omega[/tex]

Mechanical advantage:  It is ratio of output force and input force.  

Efficiency: It is ratio of output work and input work expressed as a percentage.

Answer: Option A and D

Explanation:

A mechanical advantage is defined as the ratio of output force to the input force. No units are there for the mechanical advantage. Based on the Law of conversation of energy, the energy cannot be multiplied. Efficiency is being defined as the effect of the device on the output work. It is represented as a percent.

In physics, mechanical advantage is the ratio of output force to input force (option A) and efficiency is the ratio of output work to input work, expressed as a percentage (option D). Options B and C are incorrect.

The correct definitions for the terms discussed are as follows:

Statements B and C are incorrect. For mechanical advantage, greater output force than the input is desired, so the ratio is output/input, not input/output. Similarly for efficiency, we're interested in how much of the input work is usefully converted, so it's output/input, not vice versa.

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Answer:

When we talk about closed economy, it means that the economy is self-sufficient. At a closed economy, no imports from the outside are brought inside a nation and no exports are sent out as well

Explanation:

Answer:

An example of a close economy is Brazil.

Explanation:

A closed economy is an economy that does not interact with other economies. One example is Brazil.

Answer:

Darwin's theory of natural selection lacked an adequate account of ... Darwinian principles now play a greater role in biology than ever before, .... Sadly, even if Mendel had lived to see the rediscovery of his work, he probably .... evolutionary forces are acting, a genetic equivalent to Galileo's law of inertia.

Explanation:

Answer:

A. Mendel’s genetics states laws that are now part of the theory of biological evolution.

Explanation:

edge 2021 :)

Answer:

1. protons in the atom

Explanation:

Elements in the periodic table are classified according to their number of protons: this means that each element has a different number of protons with respect to another element. There cannot be two elements having the same proton number.

The number of electrons in a neutral atom is equal to the number of protons, however an atom can loose or gain electrons (becoming an ion), therefore two elements can have the same number of electrons if one of them is an ion.

Moreover, an atom of an element can have different isotopes, which means atoms with same proton number but different number of neutrons: therefore, two elements can have the same number of neutrons in the nucleus.

Therefore, the only correct choice is

1. protons in the atom

Answer:

1. protons in the atom

Explanation:

Elements in the periodic table are classified according to their number of protons: this means that each element has a different number of protons with respect to another element. There cannot be two elements having the same proton number.

The number of electrons in a neutral atom is equal to the number of protons, however an atom can loose or gain electrons (becoming an ion), therefore two elements can have the same number of electrons if one of them is an ion.

Moreover, an atom of an element can have different isotopes, which means atoms with same proton number but different number of neutrons: therefore, two elements can have the same number of neutrons in the nucleus.

Therefore, the only correct choice is

1. protons in the atom

Answer:

C) Venus is closer to the Sun than Saturn is.

Explanation:

This is the right answer.

In a right triangle, the "Sin" of an angle is the ratio of (the leg opposite the angle) to (the hypotenuse of the triangle).

If (sin of the angle) is 5/6, then the angle is in a right triangle where the leg opposite the angle is 5 and the hypotenuse is 6.

The other leg ... the one adjacent to that angle ... is √(6² - 5²).  

That's √11 .

-- The (cosine of the angle) is

(leg adjacent to the angle) divided by (hypotenuse of the triangle).

That's  √11/6 .

-- The (tangent of the angle) is

(leg opposite the angle) divided by (leg adjacent to the angle) .

That's  5/√11 .

Final answer:

To find cos θ and tan θ, use the Pythagorean identity. For cos θ, calculate √(11/36) and take the positive or negative root based on the quadrant. Compute tan θ by dividing sin θ by cos θ to get 5√11/11.

Explanation:

Given that sin θ equals 5/6, to find the values of cos θ and tan θ, one must remember the Pythagorean identity, which states that sin²(θ) + cos²(θ) = 1. Since we are given sin θ, we can rearrange the identity to solve for cos θ:

cos^2(θ) = 1 - sin²(θ)

cos^2(θ) = 1 - (5/6)²

cos^2(θ) = 1 - 25/36

cos^2(θ) = 11/36

cos θ = ±√(11/36)

cos θ = ±√11/6

To determine the sign of cos θ, we need to know the quadrant in which the angle θ lies. Since sin θ is positive in the question, and assuming the angle is in the first or second quadrant where sin is positive, we choose the positive root if θ is in the first quadrant and the negative root if θ is in the second quadrant. Lastly, tan θ = sin θ / cos θ.

tan θ can then be calculated using the ratio:

tan θ = (5/6) / (√11/6)

tan θ = 5/√11

We can rationalize the denominator to avoid a radical in the denominator:

tan θ = (5/√11) * (√11/√11)

tan θ = 5√11/11

Answer:

With regard to memory, the process of retaining information over time is known as storage.

It's known as "long-term memory".

Answer:

D) 10^42​

Explanation:

The electrostatic force between two electrons is given by

[tex]F_E = \frac{k q^2}{r^2}[/tex]

where

k is the Coulomb's constant

q is the electron charge

r is the separation between the electrons

The gravitational force between two electrons is

[tex]F_G = \frac{G m^2}{r^2}[/tex]

where

G is the gravitational constant

m is the electron mass

r is the separation between the electrons

So the ratio between the two forces is

[tex]\frac{F_E}{F_G}=\frac{k q^2}{G m^2}=\frac{(9\cdot 10^9 Nm^2 C^{-2} )(1.6 \cdot 10^{-19}C)^2}{(6.67\cdot 10^{-11}m^3 kg^{-1}s^{-2})(9.11\cdot 10^{-31} kg)^2}=4.2\cdot 10^{42}[/tex]

The buoyancy force acting on the cube will be  3.65 N and the buoyancy force would be greater if the gold cube were suspended in water.

A fluid exerts an upward force against the weight of a partly or completely submerged item.

The weight is acting downward if the weight of a cube of gold in the air is considered then the equation ios found as;

F = W+w

Where,

F is the buoyancy force

W is the weight of a cube in water

w is the weight of the cube in the air

The buoyancy force is found as;

F = W+w

F= 1.89 +1.76

F= 3.65 N

The formula for the buoyancy force is;

F=ρgV

If the density is greater the buoyancy force is greater the density of the water is greater than the air for the same condition the buoyancy force would be greater if the gold cube were suspended in water.

Hence, the buoyancy force acting on the cube will be 3.65 N and the buoyancy force would be greater if the gold cube were suspended in water.

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The buoyancy force acting on the gold cube is 0.13 N, calculated by subtracting its weight in molasses from its weight in air. According to Archimedes' principle, the buoyancy force is due to the weight of the fluid displaced, which means it would be smaller in water than in molasses due to water's lower density.

Buoyancy force acting on a gold cube and understanding how the buoyancy force would change if the cube were suspended in water instead of molasses. When the gold cube is suspended in air, it weighs 1.89 N, and when suspended in molasses, it appears to weigh 1.76 N.

To find the buoyancy force, we subtract the apparent weight in molasses from the weight in air: 1.89 N - 1.76 N = 0.13 N. Therefore, the buoyancy force acting on the cube is 0.13 N.

Archimedes' principle states that the buoyant force on an object is equal to the weight of the fluid it displaces. Since gold is denser than most fluids, it displaces a small amount of fluid, leading to a relatively small buoyancy force.

However, if the cube were suspended in water, the buoyancy force would likely be smaller than in molasses because molasses is denser than water, and thus, the cube would displace more water by volume, but water's lower density means the displaced water would weigh less, resulting in a smaller buoyancy force.

Answer: Electrostatics is a branch of physics that studies electric charges at rest.

Answer:

the study of stationary electric charges or fields as opposed to electric currents.

Explanation:

Answer: First, question 1 is radiant energy.

Question 2 is nuclear energy

Question 3 is thermal energy

Question 4 is potential energy

Explanation Radiation ( or radiant energy) is high-energy electromagnetic waves. Nuclear energy such as nuclear fusion or fission can change the structure of a nucleus therefore lowering the atomic mass. When molecules vibrate, they produce a lot of energy through friction. That energy is converted into heat. An object that is not in motion but it's position can be altered to be in motion contains potential energy. Once the object gets moving, potential energy is converted into kinetic energy.

Radiant energy matches energy from electromagnetic waves, nuclear energy matches energy caused by changes in the structure of a nucleus, thermal energy matches energy resulting from movement and vibration of molecules, and potential energy matches energy an object has because of its position.

The forms of energy include thermal energy, radiant energy, electrical energy, nuclear energy, and chemical energy.

Energy from electromagnetic waves is referred to as radiant energy. For example, light, microwaves, and radio waves carry radiant energy.

Energy caused by changes in the structure of a nucleus is known as nuclear energy.

Energy resulting from movement and vibration of molecules is called thermal energy. When objects absorb radiant energy like sunlight or microwaves, it is converted into thermal energy.

The energy an object has because of its position is called potential energy. This includes energy stored in the chemical bonds of compounds, which is called chemical energy.

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Explanation:

So this will not exactly be an answer but an explanation.

So you're studying waves I assume? If so great.

For starters we need to figure out where light is fastest; considering what you should know being that if the medium crosses an atom it slows down.  This happens when they atom is absorbed. It isn't just one that slows it down it has to be multiple as it takes time to push the emission back out in the same direction.

Higher density = Slower WL

Lower density = Faster WL

Now where light and waves would travel fastest is in a pure vacuum where there is nothing to interrupt the path.

in summary any density slows it down, in a vacuum it can hit it's highest speeds.

If you still need help comment below

Answer:

6.8 s

Explanation:

Let's say the west end of the field is position 0 m and the east end of the field is position 250 m.

The position of kitten A is:

x = 0 + 25 t

And the position of kitten B is:

x = 250 - 12 t

The kittens collide when they have the same position:

25 t = 250 - 12 t

37 t = 250

t ≈ 6.8 s

348.34 m/s. When Superman reaches the train, his final velocity will be 348.34 m/s.

To solve this problem, we are going to use the kinematics equations for constant aceleration. The key for this problem are the equations [tex]d=v_{0} t+\frac{at^{2} }{2}[/tex] and [tex]v_{f} =v_{0} +at[/tex] where [tex]d[/tex] is distance, [tex]v_{0}[/tex] is the initial velocity, [tex]v_{f}[/tex] is the final velocity, [tex]t[/tex] is time, and [tex]a[/tex] is aceleration.

Superman's initial velocity is [tex]v_{0}=54.5\frac{m}{s}[/tex], and he will have to cover a distance d = 850m in a time t = 4.22s. Since we know [tex]d[/tex], [tex]v_{0}[/tex] and [tex]t[/tex], we have to find the aceleration [tex]a[/tex] in order to find [tex]v_{f}[/tex].

From the equation [tex]d=v_{0} t+\frac{at^{2} }{2}[/tex] we have to clear [tex]a[/tex], getting the equation as follows: [tex]a=\frac{2(d-v_{0}t) }{t^{2} }[/tex].

Substituting the values:

[tex]a=\frac{2(850m-54.5\frac{m}{s}.4.22s) }{(4.22s)^{2}}=69.63\frac{m}{s^{2}}[/tex]

To find [tex]v_{f}[/tex] we use the equation [tex]v_{f} =v_{0} +at[/tex].

Substituting the values:

[tex]v_{f} =54.5\frac{m}{s} +(69.63\frac{m}{s^{2}}.4.22s)=348.34\frac{m}{s}[/tex]

The final velocity is found to be approximately 349.07 m/s.

To determine Superman's final velocity when he reaches the train, we need to use the kinematic equations for uniformly accelerated motion. Given:

First, we can use the kinematic equation:

where s is the distance, u is the initial velocity, t is time, and a is the acceleration. Plugging in the known values:

Simplifying this:

Now, we use another kinematic equation to find the final velocity (v):

Therefore, Superman's final velocity when he reaches the train is approximately 349.07 m/s.

Answer:

D) Touch the electroscope with any charged object.

Explanation:

D) Touch the electroscope with any charged object.

The electroscope functions on the presence of charge therefore to repel the two leaves away any charged object will be helpful.

Answer: Option D

Explanation:

The electroscope is a device which functions to detect the charge on the given object. When the two leaves in the electroscope are normally placed, shows no charge is present.

To repel away the leaves, presence of charge is important and therefore when a charged body touches the electroscope, by the induction of opposite charge develops in the electroscope by which the leaves gets similar charges and hence repels away.

First you must calculate the speed of Amy and speed of Bill.

[tex]

d=14.4km=14400m \\

t_a=40min=2400sec \\

t_b=20min=1200sec \\

s_a=\frac{d}{t_a}=\frac{14400m}{2400sec}=\boxed{6\frac{m}{sec}} \\

s_b=\frac{d}{t_b}=\frac{14400m}{1200sec}=\boxed{12\frac{m}{sec}} \\

[/tex]

Now calculate the difference between Bill's speed and Amy's speed.

[tex]

\Delta{s}=s_b-s_a=12\frac{m}{sec}-6\frac{m}{sec}=\boxed{6\frac{m}{sec}}

[/tex]

Amy's average speed is not faster. Bill's average speed is faster than Amy's by 6 m/sec.

Hope this helps.

r3t40

Answer:

diatomic is the answer

Each element has 2 subscripts because they are a diatomic molecule.

Explanation:

Given Equation: [tex]2 H_{2}+O_{2} \rightarrow 2 H_{2} O[/tex]  

The meaning of ‘di’ in Greek is two. The diatomic molecules consist of only two atoms. The atmosphere of Earth mostly consists of diatomic molecules. The representation of subscript 2 of hydrogen and oxygen in the equation states that there are 2 hydrogen atoms and 2 oxygen atoms are present in the equation.

Answer:

The correct answer option is C. buzzer.

Explanation:

We know that Jeff's father needs to get a device from his workshop that converts electrical energy to sound energy.

So from the given options, buzzer is the best option Jeff's father can install in his house's security system.

An electric buzzer converts an electrical oscillating voltage into a sound output. In other words, the electrical pulses are converted into sound vibrations.

Answer:

The correct answer option is C. buzzer.

Explanation:

Answer:

[tex]4.74\cdot 10^{14}Hz[/tex]

Explanation:

The frequency of an electromagnetic wave is given by

[tex]f=\frac{c}{\lambda}[/tex]

where

[tex]c=3.0\cdot 10^8 m/s[/tex] is the speed of light

[tex]\lambda[/tex] is the wavelength

For the light wave in this problem, the wavelength is

[tex]\lambda=6.33\cdot 10^{-7}m[/tex]

So by using the equation above, we find its frequency:

[tex]f=\frac{3\cdot 10^8 m/s}{6.33\cdot 10^{-7} m}=4.74\cdot 10^{14}Hz[/tex]

The frequency of light can be found by using the formula f = c ÷ λ, where c is the speed of light and λ is the wavelength. By substituting these values into the formula, you can calculate the frequency of light with a given wavelength.

When you are given the wavelength of light and asked to find its frequency, you would use the formula c = fλ, where c is the speed of light (3.00 x 10⁸ m/s in vacuum), f is the frequency, and λ is the wavelength. To find the frequency, we rearrange this formula to get f = c ÷ λ. Given the wavelength λ = 6.33 x 10^-7 m, we can substitute these values into the rearranged formula to find the frequency:

f = (3.00 x 10⁸ m/s)  ÷  (6.33 x 10^-7 m)

By calculating the above equation, you will find the frequency of the light with the given wavelength.

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Answer:

I think that the answer is B convection. Heat is transferred by the movement of the water from hotter regions to colder regions.

Answer:

b

Explanation:

Answer:

Marble with higher speed.

Explanation:

When a marble is thrown with low speed, then it covers less horizontal distance but the marble with higher speed covers more horizontal distance though they both travells through same height from table( i.e. vertical distance).

Since both horizontal and vertical distances are responsible for projectile motion, marble with higher speed describes the motion of projectile more effectively.

Total distance traveled = 74 + 83 = 157 km.

Total time traveled = 1 + 5 = 6 hours.

Average speed = total distance / total time

Average speed = 157 km / 6 hours = 26.1666 km per hour.

Round the answer as needed.

Answer:

Inside the strong metal box, there is a microwave generator called a magnetron. When you start cooking, the magnetron takes electricity from the power outlet and converts it into high-powered, 12cm (4.7 inch) radio waves. Thus the microwaves pass their energy onto the molecules in the food, rapidly heating it up.May 3, 2018

A microwave oven heats food by producing microwaves that exert force on polar molecules such as water, causing them to rotate rapidly. This rapid rotation increases their thermal motion, producing heat. The heat then spreads to other components of the food, successfully heating the food overall.

The electrical field inside a microwave oven plays a fundamental role in heating food. This process works by producing microwaves which are electromagnetic radiation in the radio portion of the spectrum. Microwaves in a microwave oven usually operate at a frequency of 2.45 GHz.

Water molecules and some other constituents in food are known as polar molecules because they have a slight negative charge at one end and a slight positive charge at the other. These microwaves primarily interact with water molecules in the food. The oscillating electrical field of the microwaves exerts a force or torque that aligns these molecules first in one direction and then in the other, making them rotate rapidly.

This rapid rotation pumps energy into the thermal motion of the water molecules, which results in increased temperature or heat. This process is known as dielectric heating. The heat then spreads to other components of the food, heating the food overall. Therefore, the food becomes hot quickly.

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