An alarm emits sound of power 0.51 w uniformly in all directions. how much energy passes through a rectangle 20 m from the alarm in one minute? the dimensions of the rectangle are 3.0 m by 4.0 m.

The light emitted by neon signs is not a continuous spectrum, but a discrete one, consisting of only a few colors. This is due to the specific energy transitions that occur within the gas atoms when they are excited by an electrical current.

Neon signs emit a specific type of light called a discrete spectrum, which consists of only a few colors rather than a continuous spectrum. This is because neon signs are gas-discharge lamps that contain neon gas, along with other gases like argon or helium.

When electrical current passes through the gas, the electrons in the gas atoms become excited and jump to higher energy levels. As these excited electrons return to their original, lower energy levels, they emit photons of specific wavelengths corresponding to the energy difference between the levels.

This process results in the production of distinct colors rather than a continuous range of colors. The characteristic red-orange glow of neon signs, for instance, is due to the emission of light at specific wavelengths related to neon gas. Other gases can be added to create different colors, but the spectrum will still be discrete, not continuous.

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The light emitted by a neon sign constitutes only a few colors rather than a continuous spectrum. This is because neon signs work by passing electricity through a gas, usually neon, which causes the gas to emit light.

The colors of light emitted by a neon sign are determined by the type of gas used, as well as the composition of the coating on the inside of the glass tubing. Each gas emits light at a specific wavelength, which results in the characteristic colors of the neon sign. For example, neon gas emits a red-orange color, while argon gas emits blue-violet. When these gases are combined in a neon sign, they produce a limited number of colors, such as pink, purple, and yellow. The colors emitted by a neon sign are also not continuous because the energy required to produce each color is different. As the electricity passes through the gas in the sign, it excites the gas atoms and causes them to emit light at specific wavelengths. This results in distinct lines in the emission spectrum of the gas, which correspond to specific colors. In summary, the light emitted by a neon sign consists of only a few colors because it is determined by the type of gas used and the composition of the coating on the glass tubing, and the energy required to produce each color is different.

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Answer:

B. 2K + Br2 + 2KBr

D. C + 02 → CO2

Explanation:

In balancing a chemical reaction, the number of atoms on both sides of the expression must be the same in order to obey the law of conservation of mass.

According to the law of conservation of mass, in a chemical reaction, matter is neither created nor destroyed.

 So, let us investigate:

                                                 Number of atoms

                            Reactants                                        Products

K                                  2                                                      2

Br                                 2                                                      2

C + 0₂ → CO₂

C                                1                                                        1

O₂                              2                                                      2

We see that for both equations, the number of atoms on both sides of the expression is the same.

Answer: 11 m/s

vinitial=2 m/s

time=3 s

acceleration = 3 m/s^2

vfinal = ?

The key here is that it is a constant acceleration, so we can use the constant acceleration equations. The easiest one to use would be:

vfinal=vinitial + a*t

We need vfinal, so algebraically we are ready to put in numbers into the equation:

vfinal=vinitial + a*t = 2 m/s + (3 m/s^2)*(3 s ) = 11 m/s is the final velocity

The ball's final velocity is 11 m/s

From one of equations of kinematics for linear motion

We have that

v = u + at

Where v is the final velocity

u is the initial velocity

a is the acceleration

and t is the time

From the given information in the question

u = 2 m/s

t = 3 secs

a = 3 m/s²

Putting these parameters into the above formula

v = u + at

We get

v = 2 + (3×3)

v = 2 + 9

v = 11 m/s

Hence, the ball's final velocity is 11 m/s

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Based on the given information of a lattice parameter and powder X-ray wavelength, the crystal structure can be determined by considering only the FCC and BCC structures as possibilities.

The lattice parameter, denoted as 'a,' represents the distance between the lattice points in a crystal structure. In this case, the given value of 'a' is 0.4997 nm. To determine the crystal structure, we need to compare this lattice parameter with the characteristic values of the FCC (face-centered cubic) and BCC (body-centered cubic) structures.

For the FCC structure, the relationship between the lattice parameter 'a' and the radius of the atoms or ions in the structure is given by a = 4√2r, where 'r' represents the atomic or ionic radius. Similarly, for the BCC structure, the relationship is a = 4√3r.

By rearranging the equations, we can solve for the radius 'r.' For the FCC structure, r = a/(4√2), and for the BCC structure, r = a/(4√3). Substituting the given lattice parameter 'a' into these equations, we can calculate the corresponding radii for each structure.

Next, we compare the calculated radii with the typical atomic or ionic radii for different elements. If the calculated radius matches closely with the known radius of an element, then that element is likely to form the crystal structure.

Lastly, to confirm the crystal structure, we can consider the powder X-ray wavelength (λ) provided. The X-ray diffraction pattern obtained from the powder X-ray experiment can help identify the characteristic peaks for different crystal structures. By comparing the observed diffraction pattern with the known patterns for FCC and BCC structures, we can determine the crystal structure based on the closest match.

In conclusion, by calculating the radii for FCC and BCC structures using the given lattice parameter, and by analyzing the X-ray diffraction pattern obtained from the powder X-ray experiment, the crystal structure can be determined as either FCC or BCC.

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The diameter of the sphere can be solved using the relationship between the tension in the string, the linear density of the string, and the frequency of the standing waves.

This relationship is given by the equation:
f = (n/2L) * sqrt(T/u)

where f is the frequency of the standing wave, n is the number of the harmonic, L is the length of the string, T is the tension in the string, and u is the linear density of the string.

Before the sphere was submerged, the tension in the string was equal to the weight of the sphere, or T = (2.1 kg) (9.8 m/s^{2}) = 20.58 N.

After the sphere was submerged, the tension in the string was reduced by the buoyant force of the water, which is equal to the weight of the water displaced by the sphere. The volume of the sphere is given by:

V = (4/3) * pi * (d/2)^{3}

where d is the diameter of the sphere. The weight of the water displaced is equal to the volume of the sphere times the density of water, or:

Fb = (4/3) * pi * (d/2)^{3} * (1000 kg/m^{3}) * (9.8 m/s^{2})

The tension in the string after the sphere was submerged is equal to the weight of the sphere minus the buoyant force, or:

T' = 20.58 N - (4/3) * pi * (d/2)^{3} * (1000 kg/m^{3}) * (9.8 m/s^{2})

Since the frequency of the fifth harmonic with the sphere submerged is equal to the frequency of the third harmonic before the sphere was submerged, we can set the two equations equal to each other and solve for d:

(5/2L) * sqrt(T'/u) = (3/2L) * sqrt(T/u)

Squaring both sides and rearranging terms gives:

(25/9) * (T'/T) = (u/u)

Substituting the expressions for T and T' and simplifying gives:

(25/9) * [(20.58 N - (4/3) * pi * (d/2)^{3} * (1000 kg/m^{3}) * (9.8 m/s^{2}))/(20.58 N)] = 1

Solving for d gives:

d = 2 * [(9/25) * (20.58 N)/(4 * pi * (1000 kg/m^{3}) * (9.8 m/s^{2})) - (1/3)]^{(1/3)}

d = 0.117 m

Therefore, the diameter of the sphere is 0.117 m, or 11.7 cm.

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The electromagnetic radiation in order of increasing wavelength is ultraviolet light < microwaves < radio waves.

The wavelength range of the given waves are as follows:

Wavelength is the distance between identical points in the adjacent cycles of a waveform signal propagated in space. The identical points means either two crests or two troughs. It is measured in the direction of the wave.

Therefore, in terms of wavelength ultraviolet light < microwaves < radio waves.

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The force on a positive charge is arbitrarily chosen as the direction of the electric field since an electric field has both magnitude and direction.

The direction of the force acting on a negative charge is the exact opposite of the direction acting on a positive charge. The electric field surrounding a single positive charge is directed radially outward because positive charges resist one another.

Electric fields are typically shown as lines of force or field lines, which begin on positive charges and end on negative charges. A field line's tangent line shows the direction of the electric field there.

The electric field is stronger where the field lines are near together than it is farther apart. Depending on how the charge is distributed in an electric field, which is believed to be the source of the electric field, the size of the electric field around the source.

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The incorrect statement is: "Increased impulse results in increased velocity." Impulse, defined as the change in momentum, is directly proportional to the change in velocity, not the velocity itself.

The incorrect statement is: "Increased impulse results in increased velocity." Impulse, defined as the change in momentum, is equal to the force applied over a specific time interval. By Newton's second law, impulse can be represented as force multiplied by time. It is not directly linked to velocity.

While an impulse can cause a change in velocity, it does not necessarily imply that an increase in impulse will lead to an increase in velocity. Velocity depends on various factors such as mass, force, and time. Increasing the impulse alone does not guarantee an increase in velocity, as other factors like mass and the opposing forces acting on an object can influence the resulting velocity. Therefore, the statement mentioned is incorrect.

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(a) The velocity of the apple with respect to the road is 100 km/h.

(b) The velocity of the apple with respect to you is 0 km/h.

(c) If you drop the apple the horizontal velocity will not change due to law of conservation of linear momentum.

What is the relative velocity of the apple?

The relative velocity of the apple placed over your with respect to the road is calculated as follows;

Velocity of the apple = 100 km/h

Velocity of the road = 0 km/h

Va/r = 100 km/h - 0 km/h

Va/r = 100 km/h

The velocity of the apple relative to you is calculated as follows;

your velocity = 100 km/h

velocity of the apple = 100 km/h

Va/y = 100 km/h - 100 km/h

va/y = 0 km/h

If you drop the apple, the horizontal velocity will remain the same, because gravity does not affect horizontal motion.

a) Apple is moving at 100 km/hr relative to road. b) Apple is not moving relative to you. c) Apple will have the same horizontal motion as bus (100 km/hr) when it is dropped.

Newton's first law states that object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the  external force.

a) The apple is moving at 100 km/hr relative to the road. b) The apple is not moving relative to you.

c)Apple will have the same horizontal motion as the bus (100 km/hr) when it is dropped. This is because of the law of inertia, which states that an object at rest tends to stay at rest, and an object in motion tends to stay in motion with same speed and in same direction, unless acted upon by  external force.

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The principle of electromagnetic induction states that if there is a change in magnetic flux linking a coil, an electromotive force (emf) is induced in that coil. The magnitude of the induced emf is determined by the rate of change of the magnetic flux.

This forms the basis of electrical transformers. In an ideal transformer, all the flux in the primary winding links the secondary winding. In a practical transformer, however, the coupling between the windings may not be perfect. This is due to several factors such as leakage flux and poor core material.

Two coils are said to be mutually coupled if the magnetic flux Ø emanating from one passes through the other. For a perfect mutual coupling, all the flux in the primary coil passes through the secondary coil. In other words, if the coupling coefficient (k) is 1, then there is a perfect mutual coupling between the two coils.

When k is less than 1, there is a partial coupling between the two coils. The coupling coefficient k is defined as the ratio of the mutual inductance to the square root of the product of the individual inductances. Therefore, the greater the mutual inductance between two coils, the greater the coupling coefficient.

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(a) The speed at 0 second is 0 m/s

(b) The speed at 20 seconds is 5 m/s

(c) The speed at 40 seconds  is 0 m/s

The speed of an object is defined as the ratio of distance travelled to the total time of motion of the object.

v = d / t

where;

The date from the graph is given as;

distance (m )  --------------------------------- time ( s )

300                                                         0

250                                                         5

200                                                        10

150                                                        15

100                                                        20

50                                                         25

0                                                           30

The speed at 0 second = ( 300 m ) / ( 0 ) = 0 m/s

The speed at 20 seconds = ( 100 m ) / ( 20 s ) = 5 m/s

The speed at 40 seconds = ( 0 m ) / ( 40 s ) = 0 m/s

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The roller coaster's highest point is 6.12 metres above the ground.

Kinetic energy is the power a thing possesses as a result of motion. It is equal to the object's mass divided by the square of its velocity, or one-half of the object's mass. At its maximum speed of 50 m/s, the roller coaster car contains 3000j of kinetic energy.

The roller coaster's potential energy is equal to the height above the ground when it is at its highest point. Potential energy is equal to an object's mass times its gravitational acceleration times its height.

As a result, the roller coaster's highest point's separation from the ground is determined by 3000j divided by (50 m/s multiplied by 9.8 m/s2), or 6.12 metres.

Therefore, the roller coaster's highest point is 6.12 metres above the ground.

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Answer:

12.5

Explanation:

500 divided by 40 = 12.5

When you sit in your desk chair, the reaction force to your weight is the normal force from the chair, which is a true statement. Suppose that a book is sliding against a rough table, then a constant force is needed to maintain its velocity, which is also a true statement.

The normal force is an example of the contact force, which is the force that arises when two objects are in physical contact with each other. It acts perpendicular to the surface of contact and opposes the force of gravity.The force of friction acts against the relative motion of the surfaces in contact, and the net force is the difference between the two opposing forces.

When a book is sliding on a rough table, a force is needed to balance the force of friction acting on it so that its velocity can be maintained at a constant level. The book's velocity decreases over time if the force applied is less than the force of friction on the book. If the force applied is greater than the force of friction on the book, its velocity increases over time. Therefore, a constant force is needed to maintain its velocity

.According to Newton's laws of motion, a body remains at rest or in uniform motion in a straight line unless acted upon by an external force. A constant force is required to maintain uniform motion in the absence of any external force acting on the body.

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Answer:

The characteristic of light behavior that best helps explain the photoelectric effect is that light carries particles called photons. When the photons of light strike the metal surface, they transfer their energy to the electrons in the metal, and if the energy of the photons is high enough, they can cause electrons to be emitted from the metal surface. This phenomenon is known as the photoelectric effect, and it was first explained by Albert Einstein in 1905.

Answer:

304.9m

Explanation:

Given

Velocity = 300m/s

Tim = 1sec

Required

Horizontal distance S

Using the formula

S= ut+1/2gt²

S = 300(1)+1/2(9.8)(1)²

S = 300+4.9

S = 304.9m

Hence the distance travelled is 304.9m

Interference is not restricted to only some types of waves; it occurs for all types of waves.

Interference is a phenomenon that occurs when two or more waves meet in space and time. It results in the superposition of the waves, creating a new wave with a different amplitude, phase, and direction. Interference can occur for any type of wave, including electromagnetic waves (such as light and radio waves), sound waves, and water waves. In fact, interference is a fundamental property of wave behavior and is used in many applications, such as noise-canceling headphones, holography, and radio broadcasting. The interference of waves can be either constructive, where the amplitude of the resulting wave is increased, or destructive, where the amplitude of the resulting wave is decreased. The study of wave interference is an important part of physics and has practical applications in many fields.

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Answer:

Alternating

Explanation:

Edge 2020

Answer:

I would say near the end of the slide.

Earth would be an icy wasteland if greenhouse gases were not present. Greenhouse gases keep our planet livable by retaining some of the Earth's heat energy, preventing it from escaping into space. The greenhouse effect refers to the trapping of heat.

According to given data, the average speed of train is 25 km/h.

Given data,

distance = 5 km

time = 12 minutes

average speed = ?

changing time from minute to hour

So,

hour = 12 / 60

hour = 0.2

Then to calculate speed use the formula,

s = d / t

s = 5km / 0.2hr

s = 25 km/h

Velocity is the rate and direction of an object's movement, whereas speed is the time rate at which an object is moving along a path. In other words, velocity is a vector value, whereas speed is a scalar value. It has a dimension of time-distance. As a result, the basic unit of time and the basic unit of distance are combined to form the SI unit of speed. Thus, the metre per second (m/s) is the SI unit of speed.

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If you see a displayed diver-down flag while boating, it is necessary to maintain a certain distance from the flag for safety reasons. The specific distance may vary depending on local regulations and circumstances, but it is generally recommended to stay at least 100 feet away from the flag.

A diver-down flag is used to indicate the presence of divers in the water. Its purpose is to alert boaters to the potential hazards and to ensure the safety of the divers. The exact distance you must stay away from the flag may be specified by local laws or regulations, so it is important to familiarize yourself with the rules of the area you are boating in.

In many places, a common guideline is to stay at least 100 feet away from the diver-down flag. This distance allows for a safe buffer zone to prevent any accidental collisions or disturbances to the divers. However, it's crucial to check and adhere to the specific regulations in your boating location, as they may vary and could require a different distance to be maintained. Prioritizing safety and respecting the presence of divers is essential to avoid any accidents or harm to both boaters and divers.

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Answer:

9.8 meters per second squared

Explanation:

Answer:

9.8 meters per second squared

Explanation:

edge

Answer:

A.

Explanation:

The generation and transmission of electrical power are more efficient in three-phase systems due to the following reasons:

In three-phase systems, the power is distributed across three separate conductors, each carrying an alternating current that is out of phase with the others by 120 degrees. This arrangement offers several advantages that contribute to higher efficiency.

Firstly, three-phase systems provide a constant and smooth power output. The overlapping nature of the three phases ensures that the total power delivered remains relatively constant, reducing voltage fluctuations and improving the overall stability of the electrical grid. This consistent power supply is crucial for various industrial applications, where a disruption in power can lead to significant production losses.

Secondly, three-phase systems allow for efficient transmission of power over long distances. Compared to single-phase systems, three-phase power transmission requires fewer conductors to transmit the same amount of power. This reduction in the amount of material required for transmission lines results in cost savings and reduces energy losses that occur due to resistance in the conductors.

Thirdly, three-phase motors are more efficient and compact than their single-phase counterparts. Three-phase motors can provide a higher power output per unit of weight and size, making them ideal for industrial machinery and large-scale applications. The balanced and rotating magnetic fields generated by three-phase power enable smoother operation, reduced vibration, and improved torque characteristics.

In conclusion, the generation and transmission of electrical power are more efficient in three-phase systems due to their ability to provide a constant power supply, efficient transmission over long distances, and superior performance of three-phase motors.

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The generation and transmission of electrical power are more efficient in three-phase systems because three-phase power systems require less conductor material compared to single-phase systems for the transmission of the same amount of power, leading to reduced line losses. Three-phase sources are typically Y-connected because in this configuration  the phase voltages and currents are related, which makes it easier to analyze the system and to calculate power in three-phase circuits.

a) The generation and transmission of electrical power are more efficient in three-phase systems due to the following reasons:

Three-phase power systems require less conductor material compared to single-phase systems for the transmission of the same amount of power, leading to reduced line losses.

Three-phase systems have better voltage regulation, making them suitable for the transmission of power over long distances.

Three-phase power systems generate smoother power, which means that the power produced is more uniform, leading to less wear and tear on motors and other equipment.

Three-phase systems allow for the generation of a higher amount of power using less space and equipment compared to single-phase systems.

As a result, the generation of electrical power is more cost-effective in three-phase systems.

b) Three-phase sources are typically Y-connected because this configuration has the following advantages:

In a Y-connected system, the phase voltages and currents are related, which makes it easier to analyze the system and to calculate power in three-phase circuits. A Y-connected system is easier to ground compared to a delta-connected system. The neutral point in the Y-connected system is typically grounded, which reduces the risk of electric shock and damage to equipment due to ground faults.The Y-connected system can operate with a higher degree of unbalance compared to the delta-connected system. This makes it more reliable in situations where the load is not perfectly balanced across all three phases.

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Answer: B) 100N

Explanation:usatestprep

An electric circuit containing a dry cell and a torch bulb is completed by including a metal screw driver having a wooden handle. The bulb does not glow as wood does not pass electricity through it.

An electric circuit conducting current is a closed path of wires and electrical components which allows current through them on the application of potential difference between two points in the path.

Materials are usually of two types, they are conductors and insulators. Insulators do not allow current to pass through them due to the arrangement of atoms in them.

Some of the examples of insulators are wood, plastic, stone, etc.

As wood is included in the circuit, the current is not continuous and breaks its flow at the point where wood id connected.

Thus, the bulb does not glow.

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I assume you want to find the magnitudes of the horizontal and vertical components of the velocity and the maximum height reached by the cannonball.

Using the given initial velocity of 30 m/s and angle of 60 degrees above the horizontal, we can find the horizontal and vertical components of the velocity as:

vx = v0 cosθ = 30 cos(60) = 15 m/s

vy = v0 sinθ = 30 sin(60) = 25.98 m/s

The magnitude of the horizontal component of the velocity is 15 m/s, and the magnitude of the vertical component of the velocity is 25.98 m/s.

To find the maximum height reached by the cannonball, we can use the equation:

y = y0 + vy0t - (1/2)gt^2

where y0 is the initial height (assume it is zero), vy0 is the initial vertical velocity (25.98 m/s), g is the acceleration due to gravity (-9.8 m/s^2), and t is the time it takes for the cannonball to reach its maximum height.

At the maximum height, the vertical velocity is zero, so we can set vy = 0 and solve for t:

0 = 25.98 - 9.8t

t = 2.65 s

Now we can use this time to find the maximum height:

y = 0 + 25.98(2.65) - (1/2)(9.8)(2.65)^2

y ≈ 34.3 m

Therefore, the magnitudes of the horizontal and vertical components of the velocity are 15 m/s and 25.98 m/s, respectively, and the maximum height reached by the cannonball is approximately 34.3 meters.

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Explanation:

Hi, there!!

Energy is defined as the capacity or ability to do work. It's SI unit is Joule.

here,

Joule = (kg×m×m)/(s×s)

= kg×m^2/s^2.

Therefore, the derived unit is kg.m^2 by s^2.

Hope it helps...