States of matter question

The electric field expression is E(x, t) = 270 × sin(61.5x - 18.45×10⁹ t) V/m and the magnetic field expression is B(x, t) = 9×10⁻⁷ × sin(61.5x - 18.45×10⁹t) T.

To write the expressions for the electric and magnetic fields of a sinusoidal plane electromagnetic wave, we'll use the following terms: electric field, magnetic field, and sinusoidal plane.

The electric field (E) and magnetic field (B) of a sinusoidal plane electromagnetic wave can be expressed as:

E(x, t) = E0 × sin(kx - ωt)

B(x, t) = B0 × sin(kx - ωt)

where,

E0 is the electric field amplitude,

B0 is the magnetic field amplitude,

k is the wave number,

ω is the angular frequency,

x is the position along the positive x direction,

t is the time in seconds.

The electric field amplitude (E0) is 270 V/m and the frequency (f) is 2.94 GHz. We can find the angular frequency (ω) and wave number (k) as follows:

ω = 2πf = 2π(2.94×10⁹ Hz) = 18.45×10⁹ rad/s

The speed of light (c) in a vacuum is approximately 3 * 10⁸ m/s. The wave number (k) can be calculated as:

k = ω / c = (18.45×10⁹ rad/s) / (3×10⁸ m/s) = 61.5 rad/m

We can write the expressions for the electric and magnetic fields:

E(x, t) = 270 × sin(61.5x - 18.45×10⁹ t) V/m

To find B0, we use the relation:

B0 = E0 / c = 270 V/m / (3×10⁸ m/s) = 9×10⁻⁷ T

So the magnetic field expression is:

B(x, t) = 9×10⁻⁷ × sin(61.5x - 18.45×10⁹t) T

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Answer:

i would say a bus because it has to speed up after the turn

Answer:

The bus

Explanation:

when the bus turns it has a change in direction and since velocity is a vector based on speed and direction the velocity is considered changed and since acceleration is a change in velocity the bus is an example of acceleration

When your empty hand bangs lightly against a wall, the impact forces involved are relatively small, and the duration of the impact is short. As a result, the force exerted on your hand and the acceleration experienced by it are also small, causing minimal discomfort or pain.

However, when you are carrying a heavy load and your hand bangs against the wall, the impact forces can be much greater. The heavier load increases the mass of your hand-object system, leading to a larger force of impact and greater acceleration. This can result in greater discomfort or pain as the force is distributed over a larger area, increasing the pressure on your hand.

The situation described can be understood through Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. When your hand hits the wall, there is a reactionary force exerted by the wall on your hand. With a heavy load, the impact force and the reactionary force are both larger, leading to a more pronounced sensation of pain.

Therefore, Newton's third law of motion is most applicable here to explain why it hurts more when you are carrying a heavy load compared to when your empty hand bangs lightly against a wall.

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Answer:

d = 4[m]

Explanation:

Torque in physics is defined as the product of force by distance. This way you can use the following equation to calculate the torque.

\(T=F*d\)

where:

T = torque [N*m]

F = force [N]

d = distance [m]

Now replacing in the equation above.

\(84=21*d\\\\d= 4[m]\)

C hopes this helps

A soccer ball sits on the playing field

Answer:

calculate the free fall distance and velocity without air resistance from, the free fall. i hope that helps

Explanation:

Answer:

is it from positive to negative am I right tell me if I am wrong

Answer:

positive to negative

The flow of electric current is similar to the flow of water which is from higher level to lower level.

The electric current flow from higher potential region(positive* low concentration of electron) to lower potential region(negative*high concentration of electron)

to find the modulus of elasticity MoE at 23% of moisture content based on the already given modulus of elasticity of 12% moisture content we need to consider a shrinkage behavior of material. the expected MoE comes out to be approximately \(6,836 N/mm².\)

given information:

Modulus of elasticity at 12% moisture content =7,920 N/mm²

resultant shrinkage or final shrinkage percentage FSP = 30%

To calculate the expected MoE at 23% moisture content we have the following equation:

MoE-23% =   \(MoE-12%\) \((1 - FSP (23 - 12) / (100 - 12))\)

MoE-23% = \(7,920 N/mm² × (1 - 0.30 × (23 - 12) / (100 - 12))\)

MoE-23% =\(7,920 N/mm² × (1 - 0.30 × 11 / 88)\)

MoE-23% = \(7,920 N/mm² × (1 - 0.1364)\)

MoE-23% = \(7,920 N/mm² × 0.8636\)

MoE-23% =  \(6,836 N/mm²\)

therefore the expected modulus of elasticity at 23% moisture content comes out to be approx \(6,836 N/mm²\).

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Answer:

It is gymnastics.

Answer:

because if someone close to u gets sick you would know how to cure it

Answer:

spiral

Explanation:

A galaxy may be defined as the huge collection of celestial bodies like the stars, planets, dark matters, dust and gases and the solar systems. It is derived from the Greek work, 'Galaxias' , which means "milky". There are many types of galaxies. They are : Spiral galaxy, Elliptical galaxy, Irregular galaxy and Barred spiral galaxy.

A spiral galaxy is one which contains a sphere shaped bulge which consists of old stars and it is devoid of dust and gas. Its circular shape composes a disk. It is of circular shape having most of the objects concentrated in its center.

Answer:

The correct answer would be a barred spiral as it mentions an elongated spiral, so it is not a regular spiral galaxy. So the correct answer would be D

Explanation:

4.04 notes

Answer:

because liquid and solid states of water possesses intermolecular force of attraction which held the molecules of water in fixed

Answer:

1st: Radiation

2nd: Conduction

3rd: Convection

Explanation:

I actually learned this before in school. Yay

Answer:

4 Because Hypothesis sentence always have to be "If" and Then a "then"

Answer:

Explanation:

Thus, total 4+4=8 C atoms are present per unit cell of diamond. Carbon has an electronic arrangement of 2,4. In diamond, each carbon shares electrons with four other carbon atoms - forming four single bonds.

This is due to the fact that occluded fronts combine two cold air masses, which causes one of the cold air masses to go downward.

When a warm air mass is sandwiched between two cold air masses, an occluded front occurs. In an occlusion, the warm front passes over the cold front, which dives beneath it.

In a front is obscured, the warm front is fully supplanted by the cold front, in which the warm air masses have completely disappeared. Furthermore, there are frequent shifts in the various weather producing circumstances because of the cold front's relatively low temperature.

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Answer:

Explanation:

window!

The light most likely strikes on a window.

Refraction of light is defined as the bending of light when it travels from one medium to another.

Here,

When light falls on a smooth, reflecting surfaces like glass, mirror, water, it gets bounced back. This is known as the reflection of light.

But when a light ray strikes on the surface like, a window, the light will get refracted and as a result, when it passes through the glass, the path of the light is changed.

The light undergoes refraction twice, as the light enters and gets escaped from the window.

Hence,

The light most likely strikes on a window.

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Carbohydrates are broken down into glucose, which is then used by cells to produce energy through a process called cellular respiration.

What is Cellular Respiration?

It is a complex biochemical process that occurs in the mitochondria of cells and involves multiple steps and intermediate molecules. The energy released during cellular respiration is used to power the activities of the cell, including muscle contractions, cell division, and protein synthesis. Cellular respiration can be aerobic or anaerobic, depending on the availability of oxygen, and involves the use of enzymes and electron transport chains to generate ATP, the energy currency of the cell.

Fats are broken down into fatty acids and glycerol, which can also be used for energy production. Proteins can also be broken down into amino acids, which can be used for energy production in certain circumstances. The energy produced by these processes is stored in the form of ATP molecules, which can be used by cells to perform various functions and activities.

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Answer:

α=atr

the relationship between linear accelaration and linear accelaration is proportional. The greater the angular acceleration is, the larger the linear (tangential) acceleration.

Answer:

option (c). neither increases nor decreases, it is constant .

Explanation:

The total momentum of an isolated system where the net force of the system is zero neither increases nor decreases, it is constant.

What is momentum?

Momentum is the property of an object that is determined by its mass and velocity. It is a vector quantity that describes the amount of motion an object has in a specific direction.

What is an isolated system?

An isolated system is a system that does not interact with its environment in any way, shape, or form.

The total momentum of an isolated system is constant because there are no external forces acting on the system.

What is net force?

A net force is the vector sum of all the forces acting on an object or system. If the net force on a system is zero, it means that the forces acting on it are balanced, and there is no acceleration.

What is the total momentum of an isolated system where the net force of the system is zero?

The total momentum of an isolated system where the net force of the system is zero is constant. This is because the total momentum of a system is conserved, which means that it cannot be created or destroyed, only transferred from one object to another within the system.

Therefore, the total momentum of an isolated system is constant unless an external force acts on it.

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Answer:

The distance from station B to station C as seen in the velocity time graph is calculated as; 6000 m

Velocity-time graph is simply defined as a plot that shows the relationship between Velocity and Time.

Now, the velocity time graph attached shows the motion of the movement of the train from station B to station C.

Now, when it comes to velocity time graph, we have to know that the area of a velocity time graph, gives us the overall distance covered by the motion it represents.

Since the velocity time graph is a trapezium shape, then we will use the are of a trapezium formula to get the distance from station B to station C.

Area of trapezium = ¹/₂(sum of parallel sides) * height

Plugging in the relevant values from the graph gives;

Distance = ¹/₂(300 + 100) * 30

Distance = ¹/₂ * 400 * 30

Distance = 6000 m

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Answer:

1.

d . A stream of particles

2. D. Radiowave

3. Microwaves

Answer:

1.

d . A stream of particles

2. D. Radiowave

3. Microwaves

Explanation:

Answer: Often lightning occurs between clouds or inside a cloud. But the lightning we usually care about most is the lightning that goes from clouds to ground.

Explanation:  As the storm moves over the ground, the strong negative charge in the cloud attracts positive charges in the ground.

\(w = fdcos( \alpha )\)

\(w = fdcos(0)\)

\(100 = 10d \times 1\)

\( \frac{10d}{10} = \frac{100}{10} \)

\(displacement = 10 \: meters\)

When electromagnetic waves are transmitted across the interface of two isotropic dielectrics with refractive indices, the following are the boundary conditions governing the propagation of an electromagnetic wave:

Boundary conditions governing the propagation of an electromagnetic wave across the interface between two isotropic dielectrics with refractive indices n and nz are:

1. The tangential components of the electric field E are continuous across the interface.

2. The tangential components of the magnetic field H are continuous across the interface.

3. The normal components of the displacement D are continuous across the interface.

4. The normal components of the magnetic field B are continuous across the interface.

5. The tangential component of the electric field E at the interface is proportional to the tangential component of the magnetic field H at the interface, with a proportionality constant equal to the characteristic impedance Z of the medium containing the electric and magnetic fields.

Characteristic impedance Z of a medium containing electric and magnetic fields is given as Z = (u/ε)1/2, where ε is the permittivity and u is the permeability of the medium.

The values of permittivity and permeability may differ for different materials and media.

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Answer:

135N will cause a 45 kg object to accelerate at a rate of 3.0 m/s2

Explanation:

Force = mass * acceleration

Force = 45 kg * 3 m/s2

Force = 135N

Force=F

Apply Newton's second law

\(\\ \tt\longmapsto F=ma\)

\(\\ \tt\longmapsto F=45(3)\)

\(\\ \tt\longmapsto F=135N\)

Answer:

57.885.8 kg   weight of the container

Explanation:

The volume of the balloon * density of water = buoyant force of balloon

 volume of a sphere = 4/3 pi r^3

                                   = 4/3 pi * (1.5)^3 = 14.14 m^3   <===balloon volume

Now,   find the buoyant force on the container ALONE ....

             5.8 * 2.6 * 2.8  * 1027  = 43 364  kg   <=====  buoyant force

Now add the buoyant force of the balloon to find the weight

             43 364  +   14.14 * 1027 = 57885.8   kg

The observations of the red shift of most galaxies led to the idea of an expanding universe, also known as the Big Bang theory.

The red shift phenomenon, discovered by Edwin Hubble in the 1920s, refers to the observation that the light from distant galaxies is shifted towards longer wavelengths, or "red," indicating that the galaxies are moving away from us. This observation suggests that the universe is expanding. Building upon this observation, scientists developed the Big Bang theory, which proposes that the universe originated from an incredibly hot and dense state about 13.8 billion years ago and has been expanding ever since. The red shift observations provide strong evidence for the expanding universe and support the concept of the Big Bang theory.

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Answer:

The height of the roof is 4 meters high. Is this the measurement that I was supposed to answer with?

Explanation: