The block slides 2.30 meters before coming to rest.
What is frictional force?Force generated by two surfaces that contact and slide against each other is called frictional force.
As we know, W = F d
W is the work done, F is force of friction, and d is distance over which the force acts.
v² = u² + 2as
v is final velocity (zero in this case), u is initial velocity (10 m/s), a is acceleration (which we can find using Newton's second law), and s is distance traveled.
s = (v² - u²) / 2a
Given, u = 10 m/s; v = 0 m/s
As a = F / m = 87 N / 4 kg = 21.75 m/s^2
s = (0 - 10²) / (2 x 21.75) = -100 / 43.5 = -2.30 m
|s| = 2.30 m
Therefore, the block slides 2.30 meters before coming to rest.
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A freight train traveling at a speed of 18.0 m/s begins braking. The train's acceleration while breaking is -0.33 m/s^2. What is the train's speed after 23.0 seconds?
Answer:
The train's speed after 23.0 seconds of braking is approximately 9.41 m/s.
Explanation:
Using the kinematic equation:
v_f = v_i + a*t
where:
v_f = final velocity (what we are trying to find)
v_i = initial velocity (18.0 m/s)
a = acceleration (-0.33 m/s^2)
t = time (23.0 s)
Plugging in the values:
v_f = 18.0 m/s + (-0.33 m/s^2)*(23.0 s)
v_f = 9.41 m/s
our friend of mass 110 kg can just barely float in fresh water. part a calculate her approximate volume
Our friend's approximate volume is approximately 0.110 m^3.
To calculate the approximate volume of our friend, we can use the fact that she can just barely float in fresh water. This means that her weight is equal to the buoyant force acting on her. The buoyant force is given by the equation:Buoyant force = density of water x volume of displaced water x gravity
Since our friend is just barely floating, the buoyant force is equal to her weight, which is 110 kg x 9.81 m/s^2 = 1079.1 N. The density of fresh water is approximately 1000 kg/m^3.Using these values, we can rearrange the equation to solve for the volume of displaced water:
Volume of displaced water = Buoyant force / (density of water x gravity)
Volume of displaced water = 1079.1 N / (1000 kg/m^3 x 9.81 m/s^2) ≈ 0.110 m^3
Therefore, our friend's approximate volume is approximately 0.110 m^3.
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What volume, in liters, does 128 grams of O2 occupy at STP? A) 89.6 LB) 22.4 LC) 67.2 LD) 44.8 L
At STP, 128 grams of oxygen occupy an area of 89.6 liters.
option A
Simply put, the space occupied by a three-dimensional solid is its volume. Solids include a cube, a cuboid, a cone, a cylinder, or a sphere. Many shapes have different volumes.
Each three-dimensional item needs a certain amount of room. This area's volume has been calculated. The area filled by an item within the confines of three-dimensional space is referred to as its volume. The capacity of the thing is another name for it.
32 grams of oxygen make up 1 mole.
128 g / 32 g/mol = 128 g / mol of oxygen
= 4.0 mol O2
This has volume at standard temperature and pressure.
4.0 mol divided by 22.4 L/mol
= 89.6 L
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What is the equation to find the equivalent resistance, Req, of two resistors in series, R1 and R2?Group of answer choicesA) Req = R1 + R2B) Req = 1/R1 + 1/R2C) R1 = R2D)Req = 2R
Option A, Req = R1 + R2, is the correct equation for calculating the equivalent resistance of two resistors in series.
The equation to find the equivalent resistance, Req, of two resistors in series, R1 and R2, is:
Req = R1 + R2
In a series circuit, resistors are connected end-to-end so that the current flows through one resistor and then the other. The total resistance in the circuit is equal to the sum of the individual resistances. Therefore, the equivalent resistance of two resistors in series is simply the sum of their individual resistances.
Option A, Req = R1 + R2, is the correct equation for calculating the equivalent resistance of two resistors in series. Option B, Req = 1/R1 + 1/R2, is the equation for calculating the equivalent resistance of two resistors in parallel. Option C, R1 = R2, is not an equation for finding equivalent resistance. Option D, Req = 2R, is not the correct equation for finding the equivalent resistance of two resistors in series.
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As the sound propagates from one place to the other in air ,the air itself is not required to move from one place to the other
True, As the sound propagates from one place to the other in air ,the air itself is not required to move from one place to the other.
How does sound move from one location to another?
Parts of the medium that a sound is traveling through alternately compress and expand as it does so. According to science, sound is a vibration that moves through a transmission medium like a gas, liquid, or solid as an acoustic wave.
Therefore, only the energy of the moving particles is transferred during the creation of sound, not the actual particles themselves. Therefore, it is true that the air does not necessarily need to shift from one location to another in order for the sound wave to travel from one to the other.
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Two point charges of 30 μc each are 4 cm apart. What is the electric field at the midpoint between the two charges? group of answer choices A. 5. 0 x 106 n/c B. 2. 30 x 107 n/c C. 4. 50 x 107 n/c 0 n/c
The electric field is 135 N/C at the center of the two charges, which equals [tex]4.50 * 10^7 N/C[/tex], Hence the correct option is (C).
To find the electric field at the midpoint between two point charges, we can use the formula:
[tex]E = k * (q1 + q2) / r^2[/tex]
here,
E is electric field,
k is Coulomb constant [tex](9 * 10^9 Nm^2/C^2)[/tex],
q1 and q2 are charges, and
r is distance between the charges.
In this problem, we have two charges of 30 μC each, which means q1 = q2 = 30 [tex]\mu C = 30 * 10^-^6 C[/tex]. The distance between the charges is 4 cm, or 0.04 m, so r = 0.02 m.
To find the electric field at the midpoint between the two charges, we need to find the electric field due to one of the charges at the midpoint, and then double that value to account for the contribution of the other charge.
The midpoint between the two charges is 2 cm, or 0.02 m, from each charge. Therefore, we can use the formula to find the electric field due to one of the charges at the midpoint:
[tex]E1 = k * q1 / r^2 = (9 * 10^9 Nm^2/C^2) * (30 * 10^-^6 C) / (0.02 m)^2 = 67.5 N/C[/tex]
To find the total electric field at the midpoint, we need to double this value:
[tex]E = 2 * E1 = 2 * 67.5 N/C = 135 N/C[/tex]
Therefore, the electric field at the midpoint between the two charges is 135 N/C.
Answer: C. [tex]4.50 * 10^7 N/C[/tex]
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why would a baseball player see a baseball flying through the air before he hears the crack of the ball on the bat?
A baseball player see a baseball flying through the air before he hears the crack of the ball on the bat because the sound is made as the ball flies through the air. The eyes react faster than ears. Light moves faster than sound.
What are light waves ?The term light wave defined as the motion of light conceptualized as a wave, defined by such properties as reflection, refraction, and dispersion.
The light waves heavily traveled back from the sky, obtaining energy, and the sound waves traveled in a straight line, losing energy, making the sound to be delayed.
Thus, The eyes react faster than ears. Light moves faster than sound.
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Eve solves a linear equation. The final two steps of her work are shown.
7x+3.5 = 7x-3.5
3.5 = -3.5
Answer:
the 3rd option
Explanation:
3.5 = -3.5
is false in every case, for any value of x we can think of.
there is no value of x that makes this equation true.
so, there is no solution.
Find the quantity of heat required to melt completely 200g of lead initially at 27°c given that for lead :melting point=0•14j/gk , specific latent heat of fusion=270j/g. If the heat is supplied to the lead at the rate of 30j/s, find the time taken to bring the lead to it's melting point. Find the additional time required to melt melt it.
It takes an additional 1,800 seconds (or 30 minutes) to melt the lead completely.
What is Time?
Time refers to the duration it takes to heat up the lead to its melting point and the duration it takes to melt the lead completely. It is a measure of the sequence of events or the period during which something occurs or exists. In this case, the time taken is measured in seconds and is used to calculate the amount of heat required to melt the lead and the time it takes to reach the melting point and complete the process of melting.
To find the quantity of heat required to melt completely 200g of lead initially at 27°C, we use the formula:
Q = m × L_f
Where Q is the quantity of heat, m is the mass of the substance, and L_f is the specific latent heat of fusion.
Given that the mass of lead is 200g, and the specific latent heat of fusion of lead is 270J/g, we can calculate the quantity of heat required to melt the lead as:
Q = 200g × 270J/g = 54,000J
To find the time taken to bring the lead to its melting point, we use the formula:
Q = m × c × ΔT
Where Q is the quantity of heat, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature.
Since we want to bring the lead to its melting point, we need to calculate the temperature change required to do this. The melting point of lead is 327°C, so the temperature change required is:
ΔT = 327°C - 27°C = 300°C
The specific heat capacity of lead is 0.13J/gK, so we can calculate the quantity of heat required to bring the lead to its melting point as:
Q = 200g × 0.13J/gK × 300K = 7,800J
Since the heat is supplied to the lead at the rate of 30J/s, we can calculate the time taken to bring the lead to its melting point as:
t = Q / P
Where t is the time, Q is the quantity of heat required, and P is the power (rate of heat supply).
t = 7,800J / 30J/s = 260s
Therefore, it takes 260 seconds (or 4 minutes and 20 seconds) to bring the lead to its melting point.
To find the additional time required to melt the lead, we use the formula:
t = Q / P
Where Q is the quantity of heat required to melt the lead, and P is the power (rate of heat supply).
The quantity of heat required to melt the lead is 54,000J, so we can calculate the additional time required as:
t = 54,000J / 30J/s = 1,800s
Therefore, it takes an additional 1,800 seconds (or 30 minutes) to melt the lead completely.
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which hypothesis states that the moon formed eleswhere and was later caught by earth gravity
The capture theory contends that the Moon was once an errant body (similar to an asteroid) that formed somewhere else in the solar system and was drawn in by the gravity of Earth as it passed close by.
The Moon, on the other hand, was generated alongside Earth during its formation, according to the accretion theory.The theory behind fusion: According to this idea, the Moon was once a component of the Earth and somehow became apart from it early in the development of the solar system. The current Pacific Ocean basin is the most well-liked location for the region of Earth from which the Moon originated. The huge impact hypothesis, which is the most widely accepted idea and is backed by the scientific community, contends that the moon formed when something slammed into the early Earth. comparable to other worlds.The Fission Theory: According to this idea, the Moon was originally a part of the Earth and was somehow split apart from the planet early in the solar system's history. The current Pacific Ocean basin is the most well-liked location for the region of Earth from which the Moon originated.
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If the temperature is constant, what change in volume would cause the pressure of an enclosed gas to be reduced to one quarter of its original value?
Answer:
Explanation:
From ideal gas equation PV=nRT
n is the number of moles, R is the gas constant = 0.0821 atm•L/mol•K
Since temperature is constant, P1V1=P2V2
P1V1=P1/4*V2
V2=4V1
Volume of the gas must be increased 4 times
of the following, which color represents the lowest surface temperature for a star? yellow, orange, red, white, and blue
The color represents the lowest surface temperature for a star is option (3) red
The surface temperature of a star is one of the key factors that determine its color. The color of a star also depends on its composition, size, and distance from us, but temperature is the most important factor.
Stars emit light across a wide range of wavelengths, from radio waves to gamma rays. The peak of this emission is determined by the star's surface temperature, following a pattern called Planck's law. Hotter stars emit more blue and violet light, while cooler stars emit more red and infrared light.
The sequence of colors that represent the different surface temperatures of stars is commonly referred to as the "spectral sequence" or "color sequence". This sequence starts with blue stars (the hottest), followed by white, yellow, orange, and red stars (the coolest).
Therefore, the correct option is (3) red
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Ideas for uniform circular motion?This is for a physics lab if u can help please do
The time of motion of the satellite is 1.65 hours. The speed of the satellite from the centre of the Earth is 26,945.35 km/h.
What is the time of motion of the satellite?This is the motion of an object in which the object travels in a straight line and its velocity remains constant along that line as it covers equal distances in equal intervals of time, regardless of time duration.
The time of motion of the satellite in hours is calculated as follows;
t = ( 99 min / 1 ) x ( 1 hour / 60 min )
t = 1.65 hours
The speed of the satellite from the centre of the Earth in km/h is calculated as follows;
v = ( 2πr ) / ( t )
where;
r is the distance of the satellite from the centre of the Earth
The position of the satellite above the surface of the Earth = 705 km
The radius of Earth = 6,371 km
The total distance of the satellite from the centre of the Earth = 705 km + 6,371 km = 7,076 km
v = ( 2π x 7076 ) / ( 1.65 )
v = 26,945.35 km/h
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The complete question is attached with the answer below.
A metal conducting sphere of radius R holds a total charge Q. What is the surface charge density, sigma, on the outer surface of the conducting sphere?
[tex]O = Q/4PiR^{2}[/tex] is the surface charge density, sigma, on the outer surface of the conducting sphere.
The load per group of a double surface area is defined as surface charge density. It is a measurement of how much electric charge accumulates on a surface. It is represented by the symbol, and the SI unit is Coulombs for each square meter, abbreviated [tex]Cm^{2}[/tex].
A surface charge is a non-zero electric charge on a two-dimensional surface. These electric fields are constrained here on the 2-D surface, and the bias voltage on the surface is described by surface charge density, which is measured even in coulombs per square meter.
Surface charge density is defined in electromagnetism also as the quantity of electric charge per unit length, volume, or surface area. surface charge is inverse to the conductor radius of curvature.
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Explain key steps in correlative/causal relationships found within the passage.
When discussing a magnetic world, the author apparently wants readers to imagine that they are:
A.able to control the critical temperature.
B.possessors of magnets.
C.neutral observers.
D.magnets.
When discussing a magnetic world, the author apparently wants readers to imagine that they are D. Magnets.
The author in his book is trying to make the readers understand more about the magnet. This is how the author makes a correlative/causal relationships within the passage.
The author wants his readers to imagine if they are magnets, this is how they will be able to understand about the nature of the magnetic when the magnets are above the critical temperature. So, the option D is the correct answer to our question.
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2 IS MOT A heater in an electrical circuit has a current of 5 A passing through it and a potentia difference of 240 V across it. What is the power of the heater in cents
Answer:
To calculate the power of the heater, we can use the formula:
Power = Current x Voltage
In this case, the current is 5 A and the voltage is 240 V, so we have:
Power = 5 A x 240 V
Power = 1200 watts
Explanation:
To convert watts to cents, we need to know the cost of electricity in cents per unit of energy (usually measured in kilowatt-hours, or kWh). For example, if the cost of electricity is 15 cents per kWh, then the cost of running a 1200 watt appliance for one hour would be:
1200 watts = 1.2 kilowatts
1.2 kilowatts x 1 hour = 1.2 kilowatt-hours
1.2 kilowatt-hours x 15 cents/kWh = 18 cents
So the cost of running this heater for one hour would be 18 cents, assuming a cost of 15 cents per kWh.
What was the black hole in Interstellar?
The black hole in Interstellar was a fictional depiction of a supermassive black hole called Gargantua.
Explanation: In the movie Interstellar, Gargantua is a supermassive black hole located near the fictional wormhole that connects our galaxy to another. The black hole was created using scientific simulations based on the theories of physicist Kip Thorne, who served as a consultant for the film. The depiction of the black hole in the movie was intended to be as scientifically accurate as possible, taking into account the effects of gravitational lensing and time dilation.
The stunning visuals of the black hole in the movie were achieved using a combination of computer-generated graphics and practical effects, making it one of the most realistic depictions of a black hole in film history.
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What is the conversion of 17 degrees c to f ?
The conversion of 17 degrees Celsius to Fahrenheit is 62.6 degrees Fahrenheit.
The equation F = 9/5C + 32 relates temperature measured in degrees Celsius (C) to degrees Fahrenheit (F). The formula is used to convert temperatures from Celsius to Fahrenheit , and vice versa. To use the formula, you simply plug in the known temperature in Celsius (or Fahrenheit), and then solve for the unknown temperature in Fahrenheit (or Celsius).
To convert Celsius to Fahrenheit, you would use the formula F = 9/5C + 32, where C is the temperature in Celsius and F is the temperature in Fahrenheit. Thus, for 17 degrees Celsius, the formula would be F = 9/5(17) + 32 = 62.6 F.
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what is the required number of known physical variables that are needed to solve for the unknown quantities using the kinematic equations?
When analyzing the motion of a single object, four known physical variables are needed to solve for the unknown quantities using the kinematic equations.
These variables are displacement (s), velocity (v), acceleration (a), and time (t). When solving for the unknown quantities, you can use any combination of the four variables to solve for the desired unknown. For example, if you know the acceleration, displacement, and time, you can use the equation at^2/2 + vt + s = 0 to solve for the velocity. Similarly, if you know the velocity, displacement, and time, you can use the equation v^2 = 2as + v0^2 to solve for the acceleration.
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under which circumstance is there a force exerted on the apple by your hand?
When you pick up an apple with your hand, a force is exerted on the apple. This force is a result of the interaction between the apple and your hand.
The force is generated by the friction between the apple and your hand, as your hand exerts a pushing or gripping pressure on the apple. Additionally, the force is exerted on the apple by the gravity of the Earth, as the apple is pulled down towards the ground as a result of its weight. These two forces combine to create the force exerted on the apple by your hand.
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how to find spring constant with time
To find the spring constant (k) using time, you need to perform an experiment that involves measuring the motion of an object attached to a spring.
Perform the experiment of spring attached to mass m. You will displace the object and measure the time it takes to complete one full oscillation or period (T). Using the equation k = (4π^2m)/T^2, where m is the mass of the object, you can calculate the spring constant.
Repeat the experiment for different masses to verify that the spring constant remains constant. This method assumes that the motion of the object is simple harmonic motion, which is valid for small oscillations around the equilibrium position. The calculated spring constant may not be accurate if the displacement is too large.
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What is the gravitational force between two objects attract?
The gravitational force between two objects attract is the force of attraction that exists between any two objects in the universe.
The gravitational force between two objects is the force of attraction that exists between any two objects in the universe. This force is dependent on the mass of the two objects and the distance between them.
According to the law of universal gravitation, the force of attraction between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. Mathematically, this can be expressed as:
[tex]F = G(m-1m-2)/r^2[/tex]
here F is gravitational force, G is the gravitational constant (a universal constant with a value of [tex]6.67 * 10^-^1^1 Nm^2/kg^2[/tex], m1 and m2 are the masses of the two objects, and r is the distance between the centers of their masses.
As the distance between the two objects increases, the gravitational force between them decreases. This means that the force is weaker when the objects are further apart, and stronger when they are closer together. This is because the force is spread out over a larger area as the distance increases, resulting in a weaker force per unit area.
The gravitational force between two objects is always attractive, which means that the force pulls the two objects toward each other. This is why planets are attracted to the sun, and why objects on Earth are attracted to the center of the planet. The magnitude of the gravitational force between two objects is proportional to their masses, which is why larger objects have a stronger gravitational force than smaller ones.
Overall, the gravitational force between two objects is a fundamental force of nature that plays a crucial role in the behavior of the universe, from the motion of planets to the formation of galaxies.
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During a hot shower, water vapor fogs up the cooler mirror when it turns to water. this is an example of _____.
Answer:
condensation
Explanation:
During a hot shower, the water vapor condenses on the cooler mirror, causing it to fog up. This is an example of condensation, which is the process by which a gas or vapor turns into a liquid when it comes into contact with a cooler surface. The water vapor in the air is at a high temperature, but when it comes into contact with the cooler surface of the mirror, it loses heat energy and transitions back into its liquid state. This phenomenon can also be observed when dew forms on the grass in the early morning or when water droplets form on the outside of a cold drink on a hot day.
In one sentence describe how modeling is used in science
Answer:
Modeling is used in science to simplify complex systems and phenomena, allowing scientists to make predictions and test hypotheses.
Explanation:
which kind of spectrum is produced by a white household incandescent lightbulb?
Kayla is going on a trip. The mass of
everything she is packing is 9.8 kg.
She packs everything into a bag that has a
mass when empty of 620 g.
What is the total mass of the bag and its
contents?
Give your answer in kg
Answer:
the total mass of the bag and its contents is 10.42 kg.
Explanation:
First, we need to convert the mass of the bag when empty from grams to kilograms:
620 g = 0.62 kg
Next, we can add the mass of the bag when empty to the mass of everything Kayla is packing:
total mass = 9.8 kg + 0.62 kg = 10.42 kg
Therefore, the total mass of the bag and its contents is 10.42 kg.
what is baking soda ph
you research the star sirius and find that its spectral lines are blue-shifted. what does this tell you about sirius?
The correct option is C. This tells you that Sirius has a radial velocity that is toward us.
The star Sirius is part of the Canis Major constellation.. It is the brightest star in the night sky and is often referred to as the "Dog Star" due to its position in the constellation. It is a binary star system composed of a white main sequence star designated Alpha Canis Majoris and a faint white dwarf companion known as Sirius B. Sirius is a main sequence star and is estimated to be around twice as massive as the Sun and has a surface temperature of 9,940 K.This means that the star is moving closer to us, and its spectral lines are shifted to shorter wavelengths (the blue end of the spectrum). This implies that Sirius is moving faster than the stars around it and the light from the star is Doppler shifted toward the blue end of the spectrum.
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complete question:
You research the star Sirius and find that its spectral lines are blue shifted. What does this tell you about Sirius?
A. It has a transverse velocity that is toward us.
B. Its surface temperature is higher than that of the Sun.
C. It has a radial velocity that is toward us.
D. It has a radial velocity that is away from us.
E. It has a transverse velocity that is away from us.
The measurement of body temperature is an example of a variable that uses what scale?A. Interval scaleB. Ordinal scaleC. Nominal ScaleD. Ratio scale
The measurement of body temperature is an example of a variable that uses option A, interval scale.
A scale with an interval has order and a meaningful difference between two values. Temperature (Fahrenheit), temperature (Celsius), pH, SAT score (200-800), and credit score are a few examples of interval variables (300-850).
One variable that uses interval scale is the measurement of body temperature.
Only ratio scales have a genuine zero, even though interval and ratio data can both be categorized, sorted, and spaced equally apart between consecutive values. As 0 is not the lowest attainable temperature, temperature in Celsius or Fahrenheit, for instance, is measured on an interval scale.
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Which species does not exhibit paramagnetism? (a) N2
(b) O2
(c) CO
(d) NO
The correct Answer is Option (b) O2 does not exhibit Para-magnetism. Because, Para-magnetism is a property exhibited by substances that have unpaired electrons, which are attracted to an external magnetic field.
N2, CO, and NO all have unpaired electrons and exhibit Para-magnetism. However, O2 has only paired electrons, which makes it diamagnetic and not attracted to an external magnetic field. In paramagnetic substances, the individual atoms or molecules have unpaired electrons, which create a magnetic moment that aligns with the applied magnetic field. Hence (b) is the correct Option.
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