The law prohibits a person from _________ an electric vehicle/"ev"-designated parking space.

Only 12 lb and 1600 kN .

Amplitude.

The amplitude A is the maximum elongation of each point of the wave with respect to the  central or equilibrium position.

In a sinusoid wave is the maximum distance in the absolute value of the curve measured from the x axis, can be represented as y(t) = A sen (ωx + φ).

Example:

y(t) = 10 sin (2πx), Where the amplitud of the sine wave is A = 10

Answer:

A represents the amplitude of the wave. This measures the sound wave's intensity, or volume.  Pls mark brainliest. Have a nice day!

A meteor is the flash of light that we see in the night sky when a small chunk of interplanetary debris burns up as it passes through our atmosphere. "Meteor" refers to the flash of light caused by the debris, not the debris itself.

If any part of a meteoroid survives the fall through the atmosphere and lands on Earth, it is called a meteorite.

When meteoroids enter Earth's atmosphere at high speed and burn up, or “shooting stars” are known as meteors. When a meteoroid survives a through the atmosphere and hits the ground, it's known as a meteorite.

Two asteroids collide with each other, and their pieces from asteroids after the collision is called a meteorite.

When a meteorite hits the earth’s atmosphere at a high velocity, which makes a fireball. Therefore, shooting stars are meteors and are different types of meteors, according to their sizes and brightness.

Earth grazer's meteors streak close to the horizon. Fireballs are bright and more long-lasting than earth grazers. Meteors do not land while meteorites land on the surface of the earth.

Meteoroids break down in the atmosphere as a flash of light known as meteors. Meteorites can be described as broken meteoroids that land on the earth.

Learn more about meteors and meteorites, here:

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Answer:

6.81 × 10^-4

Explanation:

A number is said to be in standard form when it is written in the form of A × 10^n.

6.81 × 10^-4

6.81× 0.0001

= 0.000681

The correct scientific notation of the number 0.000681 is 6.81 × 10⁻⁴.

The scientific notation provides the way of expressing  a complex number in the easiest way.

A number is said to be in scientific form when it is written in the form of A × 10^n.

0.000681 = 6.81× 0.0001

0.000681 = 6.81 × 10⁻⁴

Thus,  correct scientific notation of the number 0.000681 is 6.81 × 10⁻⁴.

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Answer:

Will double

Explanation:

The total resistance of a circuit with n resistors in series is equal to the sum of the individual resistances:

[tex]R_T = R_1 + R_2 + ... + R_n[/tex]

In this problem, we have a circuit with initially one light bulb of resistance R, so the total resistance of the circuit is:

[tex]R_T = R[/tex]

Later, a second identical bulb (so, same resistance R) is added in series to the circuit; so applying the previous formula, we see that the new total resistance is

[tex]R_T = R + R = 2 R[/tex]

So, the resistance has doubled.

Blood pressure is the force that blood exerts when circulating through our body (if it is considered as a fluid) on the internal walls of veins, blood vessels and especially the arteries.

In this sense, arteries are the "conduits" that carry blood from the heart to various parts of the body, analogous to the water flow in the pipes of a house. So, each time a person's heart beats, it pumps blood to the arteries and from there it is distributed throughout the body.

Now, this blood pressure is divided into two terms:

Systolic pressure: When the heart is pumping blood and the force exerted on the arteries is high.

Diastolic pressure: When the heart is at rest (between heartbeats) and the pressure in the arterial walls is low.

Another important factor in blood pressure is the extent to which the arteries exert resistance to the circulation of the blood flow, depending on how narrow or wide they are and the amount of blood that passes through them.  

In other words, this pressure is determined by two main aspects:

-The amount of blood pumped and the force it exerts on the arteries.

-The size and flexibility of these arteries.

Finally, it is important to note this process is a basic part of life and is one of the main vital signs when testing the health status of a person.

Answer:

Gay Lussac law

Explanation:

Gay Lussac law states that for a gas kept at constant volume (so, in a rigid container), the pressure of the gas is directly proportional to the absolute temperature.

In mathematical formula:

[tex]\frac{p}{T}=k[/tex]

where

p is the gas pressure

T is the absolute temperature

According to this law, we see therefore that if the absolute temperature of the gas is doubled:

T' = 2T

The pressure will also double:

[tex]\frac{p}{T}=\frac{p'}{T'}\\p' = p \frac{T'}{T}=p\frac{2T}{T}=2p[/tex]

Answer:

Gay-Lussac’s law

Explanation:

This is the correct answer on Edge.

Answer:

The restoring force is directly proportional to the displacement of the block.

Explanation:

For a spring-mass system, the restoring force is given by Hooke's Law:

F = -kx

where

F is the restoring force

k is the spring constant

x is the displacement of the block, attached to the end of the spring

As we see from the equation, the restoring force is directly proportional to the displacement of the block. So, the correct answer is

The restoring force is directly proportional to the displacement of the block.

The correct statement for the answer to the question is The style of recovery is directly proportional to the displacement of the block.

Restoring force is a force whose magnitude is proportional to the deviation and is always in the opposite direction to the deviation. Restoring force that causes objects to move in simple harmonics. Simple Harmonic Motion is a movement back and forth around the balance point.

Terms of an object said harmonic include the following:

Hooke's law states that if the tensile force does not exceed the elastic limit of the spring, then the length of the spring is proportional to the tensile force. If a spring is disturbed so the spring is stretched (the spring is pulled) or docked (the spring is pressed), then the spring will work the restoring force whose direction is always toward the origin.

The force that arises in the spring to return its position to a state of equilibrium is called the recovery force on a spring. A large restoration force on the spring is proportional to the disturbance or deviation experienced by the spring.

Hooke's law can be stated in the following formula equation:

Fp = -k. Δy

(Note : The negative sign (-) in the formula is an indication that the direction of the recovery force always goes towards the point of balance that is opposite to the direction of the force of the cause)

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Details

Class: High School

Subject: Physics

Keyword: recovery force on a spring.

Answer:

C. It speeds up, and the angle increases

Explanation:

We can answer by using the Snell's law:

[tex]n_i sin \theta_i = n_r sin \theta_r[/tex]

where

[tex]n_i, n_r[/tex] are the refractive index of the first and second medium

[tex]\theta_i[/tex] is the angle of incidence (measured between the incident ray and the normal to the surface)

[tex]\theta_r[/tex] is the angle of refraction (measured between the refracted ray and the normal to the surface)

In this problem, light moves into a medium that has lower index of refraction, so

[tex]n_r < n_i[/tex]

We can rewrite Snell's law as

[tex]sin \theta_r =\frac{n_i}{n_r}sin \theta_i[/tex]

and since

[tex]\frac{n_i}{n_r}>1[/tex]

this means that

[tex]sin \theta_r > sin \theta_i[/tex]

which implies

[tex]\theta_r > \theta_i[/tex]

so, the angle increases.

Also, the speed of light in a medium is given by

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

where c is the speed of light and v the refractive index: we see that the speed is inversely proportional to n, therefore the lower the index of refraction, the higher the speed. So, in this problem, the light will speed up, since it moves into a medium with lower index of refraction.

A) m = 4

We can solve the problem by using Rydberg equation:

[tex]\frac{1}{\lambda}=R_H (\frac{1}{n^2}-\frac{1}{m^2})[/tex]

where

[tex]R_H = 1.097\cdot 10^7 m^{-1}[/tex] is the Rydberg constant for hydrogen

n is the principal quantum number of the upper energy level

m is the principal quantum number of the lower energy level

For the first wavelength, we have

[tex]\lambda=97.26 nm = 97.26\cdot 10^{-9} m[/tex]

Substituting into the equation, we find

[tex]\frac{1}{n^2}-\frac{1}{m^2}=\frac{1}{\lambda R_H}=\frac{1}{(97.26\cdot 10^{-9} m)(1.097\cdot 10^7 m^{-1})}=0.9373[/tex])

By setting n=1, we obtain the Lyman series which goes from 121.6 nm (for m=2) to 91.18 nm (for [tex]m=\infty[/tex]). So our line of 97.26 nm must be in this series.

By setting n=1, we find m:

[tex]\frac{1}{m^2}=\frac{1}{n^2}-0.9373=\frac{1}{1^2}-0.9373=0.0627\\m=\frac{1}{\sqrt{0.0627}}=4[/tex]

B) n = 1

n can be found by thinking about the limit of the different series.

Larger n corresponds to larger wavelengths; for each n, m goes from (n+1) to [tex]\infty[/tex], and the shortest wavelength of each series is the one corresponding to [tex]m=\infty[/tex].

If we put n = 2, and [tex]m=\infty[/tex], we find the shortest wavelength of the n=2 series:

[tex]\frac{1}{\lambda}=R_H (\frac{1}{n^2}-\frac{1}{m^2})=(1.097\cdot 10^7 m^{-1})(\frac{1}{2^2}-\frac{1}{\infty})=\frac{1.097\cdot 10^7 m^{-1}}{4}=2.74\cdot 10^6 m^{-1}\\\lambda=\frac{1}{2.74\cdot 10^6 m^{-1}}=3.64\cdot 10^{-7} m = 364 nm[/tex]

which is longer than our line at 97.26 nm, so n must be smaller than 2, which means n=1.

C) m = 5

Similarly to what we did in part A), here we have a wavelength of

[tex]\lambda=1282 nm = 1282\cdot 10^{-9} m[/tex]

Substituting into the Rydberg equation, we find

[tex]\frac{1}{n^2}-\frac{1}{m^2}=\frac{1}{\lambda R_H}=\frac{1}{(1282\cdot 10^{-9} m)(1.097\cdot 10^7 m^{-1})}=0.0711[/tex])

By setting n=3, we obtain the Paschen series which goes from 1875 nm (for m=4) to 820.4 nm (for [tex]m=\infty[/tex]). So our line of 1282 nm must be in this series.

By setting n=3, we find m:

[tex]\frac{1}{m^2}=\frac{1}{n^2}-0.0711=\frac{1}{3^2}-0.0711=0.04001\\m=\frac{1}{\sqrt{0.04001}}=5[/tex]

D) n = 3

Similarly to what we did in part B), if we put n = 4, and [tex]m=\infty[/tex], we find the shortest wavelength of the n=4 series:

[tex]\frac{1}{\lambda}=R_H (\frac{1}{n^2}-\frac{1}{m^2})=(1.097\cdot 10^7 m^{-1})(\frac{1}{4^2}-\frac{1}{\infty})=\frac{1.097\cdot 10^7 m^{-1}}{16}=6.856\cdot 10^5 m^{-1}\\\lambda=\frac{1}{6.856\cdot 10^5 m^{-1}}=1.458\cdot 10^{-6} m = 1458 nm[/tex]

which is longer than our line at 1282 nm, so n must be smaller than 4. Indeed, if we try with n=3, we find:

[tex]\frac{1}{\lambda}=R_H (\frac{1}{n^2}-\frac{1}{m^2})=(1.097\cdot 10^7 m^{-1})(\frac{1}{3^2}-\frac{1}{\infty})=\frac{1.097\cdot 10^7 m^{-1}}{9}=1.219\cdot 10^6 m^{-1}\\\lambda=\frac{1}{1.219\cdot 10^6 m^{-1}}=8.204\cdot 10^{-7} m = 820.4 nm[/tex]

So, our line is contained in the n=3 series.

E) Ultraviolet

We can answer this question by looking at the different wavelengths of the electromagnetic spectrum. In fact, we have:

Ultraviolet: 380 nm - 1 nm

Visible: 750 nm - 380 nm

Infrared: 1 mm - 750 nm

Our wavelength here is

97.26 nm

So, we see it is included in the ultraviolet part of the spectrum. In fact, all lines in the Lyman series (n=1) lie in the ultraviolet ragion.

F) Infrared

Again, the electromagnetic spectrum is:

Ultraviolet: 380 nm - 1 nm

Visible: 750 nm - 380 nm

Infrared: 1 mm - 750 nm

Our wavelength here is

1282 nm

So, we see it is included in the infrared part of the spectrum. In fact, all lines in the Paschen series (n=3) lie in the infrared band.

The wavelength 97.26 nm represents ultraviolet light, with m=1 and n=2, while the wavelength 1282 nm represents infrared light, with m=3 and n=4. These conclusions are derived from the Balmer-Rydberg equation where m and n are quantum states.

The wavelengths emitted by a hydrogen atom are determined by the energy difference between quantum states, which are indicated by the values of m and n. For hydrogen, the series corresponding to an m value of 1 is in the ultraviolet spectrum, while the series corresponding to an m value of 3 is in the infrared spectrum.

Part A and B: The wavelength 97.26 nm belongs to the Lyman series (where m=1) and in it, the n value is 2 for this wavelength. Therefore by the Balmer-Rydberg equation, this presents ultraviolet light since it falls into 10nm to 400nm range which represents the ultraviolet spectrum.

Part C and D: The wavelength 1282 nm corresponds to the Paschen series (where m=3) and the n value is 4, thus resulting in an infrared light since it falls over 700 nm which represents the infrared spectrum.

Part E and F: Summarily, The 97.26 nm wavelength represents ultraviolet light while the 1282 nm wavelength represents infrared light.

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Answer:

623.8 m

Explanation:

Answer:

53.4 m/s

Explanation:

For a standing wave on a string, the fundamental frequency is given by

[tex]f=\frac{v}{2L}[/tex]

where

v is the wave speed

f is the frequency

L is the length of the string

For the wave on the guitar string in this problem, we have

[tex]f=30 Hz[/tex] is the fundamental frequency

L = 89 cm = 0.89 m is the length of the string

Solving the equation for v, we find the wave speed:

[tex]v=2Lf=2(0.89 m)(30 Hz)=53.4 m/s[/tex]

The wave speed on the 89 cm bass guitar string with a fundamental frequency of 30 Hz is 53.4 m/s.

The subject in question pertains to wave speed on a string, specifically a bass guitar string. This is a physics problem related to the concept of wave motion. To calculate wave speed, we use the formula v = fλ, where v is wave speed, f is the fundamental frequency, and λ is the wavelength. Given that the length of the string equals half the wavelength (λ = 2L for a string fixed at both ends), the wavelength (λ) for the bass guitar string would be 2 × 89 cm = 178 cm or 1.78 m.

Substituting the known values (f = 30 Hz and λ = 1.78 m) into the formula, we obtain v = 30 Hz × 1.78 m = 53.4 m/s.

Therefore, the wave speed on this bass guitar string is 53.4 m/s.

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Answer: More than 48 tons of debris falls into Earth’s atmosphere every day and asteroid impacts have literally shaped Earth resulting craters from large objects crashing into the crust. Upon impact, vaporized dirt and rock would fill the atmosphere, blocking sunlight and causing winter like conditions

Explanation:

Final answer:

Comets, asteroids, and meteorites influence life on Earth through global catastrophes, the formation of essential elements, and the shielding effect of large outer planets.

Explanation:

Comets, asteroids, and meteorites influence life on Earth in several ways. Firstly, the impacts of comets and asteroids can cause global catastrophes, leading to the extinction of species and significant changes in the evolution of life on the planet. These impacts release large amounts of energy, change the climate, and create widespread destruction.

Additionally, the debris from comets and asteroids, such as dust and organic compounds, can contribute to the formation of life on Earth by providing essential elements like water and organic materials. Moreover, the gravitational fields of large outer planets in our solar system can help shield Earth from more frequent and larger impacts. Therefore, comets, asteroids, and meteorites play a crucial role in shaping and influencing life on Earth.

By implementing ray tracing rules for concave mirrors and applying the mirror/lens formula, it is observed the formed image is real and inverted.

For the given scenario, the object is farther from the concave mirror than its focal length. We use ray tracing principles to locate the image. Ray 1 approaches parallel to the axis, Ray 2 strikes the center of the mirror, and Ray 3 goes through the focal point on the way toward the mirror. These rays will cross at the same point after being reflected, which locates the inverted real image. This qualifies as a case 1 image for a converging mirror.

Now to confirm if the image is upright or inverted we need to understand that inverted images correspond to a negative magnification. Using the mirror formula 1/f = 1/v + 1/u, and given that u = -40 cm and f = -20 cm, we can solve for the image distance (v). The calculation gives us v = -40 cm, which is negative, hence the image is real and inverted.

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The image formed by the concave mirror is located 40 cm from the mirror, inverted, and of the same size as the object.

Locating the Image Using a Concave Mirror

To locate the image formed by a concave mirror, we follow the rules of ray tracing:

Given:

Analyzing:

Draw the object 40 cm in front of the concave mirror.

Draw Ray 1 parallel to the principal axis; it will reflect through the focal point.

Draw Ray 2 passing through the focal point; it will reflect parallel to the principal axis.

Draw Ray 3 to the center of the mirror; it will reflect back at the same angle.

The intersection of these rays gives the location of the image.

The rays intersect at 40 cm on the same side as the object. Thus, the image is located 40 cm from the mirror.

The image is inverted and of the same size as the object.

Answer:

It cannot be changed

Explanation:

The freezing point of water cannot be changed; it stays the same.

Answer:

The electrons that are available to form bonds are known as valence electrons.

Explanation:

Answer:

Explanation:

Electricity is generated from solar energy predominantly by the use of photovoltaic cells.

The sun is the ultimate source of energy for all life and the bulk of the solar system at large.

Energy from the sun is used for various life processes and other abiotic uses.

In order to harness the sun's energy to produce electricity, a photovoltaic cell is required. These cells are often used in making solar panels which are available in most places today.

Electricity is produced by the movement of electrons within a cell or a body. In a photovolatic cell, the radiation from the sun causes chemical reactions to occur on the surface of these materials. The reaction is such in which electrons are produced. The movement of electrons in these cells results in the generation of electricity.

In some other cases, sunlight can be concentrated for heating water to produce steam. Steam can be used to drive turbines to produce electricity too.

Answer: True

Refraction is a phenomenon in which the light bends or changes its direction (and changes the speed of propagation, as well) when passing through a medium with a refractive index [tex]n[/tex] different from the other medium.  

Where the Refractive index is a number that describes how fast light propagates through a medium or material:

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

Being [tex]n[/tex] a relation between the speed of light in vacuum [tex]c[/tex]  and its speed in the other medium [tex]v[/tex] .

It is important to note that in this process, the wavelength may be modified because it depends on the medium, however, the refracted ray of light does not change its frequency.

Answer:

12,500 feet

Explanation:

Answer:

[tex]8.64\cdot 10^{-18} C[/tex]

Explanation:

There are two forces acting on the oil drop:

- The force of gravity, downward, given by

[tex]F_G = mg[/tex]

where m is the mass of the drop and g is the acceleration due to gravity

- The electric force, upward, given by

[tex]F_E = qE[/tex]

where q is the charge of the oil drop and E is the magnitude of the electric field

The oil drop remains stationary, so the two forces are balanced:

[tex]F_G = F_E\\mg = qE[/tex]

where

[tex]m=5.2898\cdot 10^{-13}kg\\E=6\cdot 10^5 N/C\\g = 9.8 m/s^2[/tex]

Substituting into the previous equation and solving for q, we find the charge of the oil drop:

[tex]q=\frac{mg}{E}=\frac{(5.2898\cdot 10^{-13} kg)(9.8 m/s^2)}{6\cdot 10^5 N/C}=8.64\cdot 10^{-18} C[/tex]

The charge of a stationary oil drop can be calculated by balancing gravitational force with electric force. In this case, the calculated charge is approximately -1.37 x 10-18 C, indicating about 9 excess electrons on the oil drop.

In Robert A. Millikan's famous oil drop experiment, we balance the downward gravitational force with an upward electric force to determine the charge of an electron. In this case, with the oil drop being stationary, it means that these two forces are equal. Therefore, we can say that the upward force (qE) is equal to the downward force (mg).

By rearranging this equation for q (charge), we get q = mg / E. Substituting the given values, mass m = 5.2898 × 10-13 kg, acceleration due to gravity g = 9.8 m/s2, and electric field E = 6 × 105 N/C, into this formula, we get q = (5.2898 × 10-13 kg * 9.8 m/s2) / 6 × 105 N/C.

This gives us the charge q = -1.37 x 10-18 C. Finally, from Millikan's oil drop experiment, we know the quantized charge of an electron is -1.6 x 10-19 C, therefore, it indicates that there are approximately 9 excess electrons on the oil drop.

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Time

The average speed of an object that is moving is defined as the distance traveled  divided by the time of travel. You can measure the distance with a ruler and the time with a stopwatch. This can be expressed as the following formula:

[tex]v=\frac{\Delta x}{\Delta t}[/tex]

For instance, if an object travels a distance [tex]\Delta x=100m[/tex] in 4 seconds, the the average speed is:

[tex]v=\frac{100m}{4s} \\ \\ \therefore \boxed{v=25m/s}[/tex]

Average speed is calculated by dividing the total distance traveled by the elapsed time, represented as D / Δt, where D is distance and Δt is the time interval. It is a scalar quantity, indicating the average rate of travel without regard to direction.

The question asks, "Average speed is the total distance divided by the?" The answer is elapsed time. Average speed is a fundamental concept in physics that represents the average rate at which distance was traversed over a period of time. It is calculated by dividing the total distance traveled by the total time taken for the journey. Unlike average velocity, which is a vector quantity and considers direction, average speed is a scalar quantity, meaning it only considers magnitude and has no direction associated with it. To calculate average speed (ϕavg), the formula used is: vavg = D / Δt, where D represents the distance traveled and Δt represents the time interval.

For example, if a person travels 100 kilometers over 2 hours, their average speed would be calculated as 100 km divided by 2 hours, resulting in an average speed of 50 km/h. This calculation indicates that, on average, the person covered 50 kilometers for each hour of travel. It's critical to differentiate between average speed and average velocity because the latter takes into account the travel direction, whereas the former does not. Understanding average speed is crucial for solving a plethora of problems in physics, particularly those related to motion and dynamics.

Volume.

Hope this helps.

r3t40

Answer:

Speed is the distance traveled during a specific unit of time.

Answer:

speed

Explanation:

edge 2021

The atomic radius decreases from left to right across a period due to the increase in nuclear charge, which attracts electrons more strongly and pulls them closer to the nucleus. This leads to a contraction of the electron cloud and a decrease in the atomic radius.

The atomic radius decreases from left to right across a period in the periodic table due to the increase in the number of protons in the nucleus. This increase in protons enhances the nuclear charge, which in turn attracts the electrons more strongly, pulling them closer to the nucleus. As a result, the effective nuclear charge experienced by the outermost electrons increases, leading to a decrease in the atomic radius.

As electrons are added to the same principal energy level while moving across a period, the increased positive charge of the nucleus draws these electrons closer. This process causes the electron cloud to contract, and thus, the atomic radius decreases. It's important to note that there are some exceptions and nuances, such as electron-electron repulsions and shielding effects, which can influence this trend to some extent.

Moreover, the largest atoms are found in the lower left corner of the periodic table, while the smallest atoms are located in the upper right corner. This phenomenon is a direct result of the aforementioned periodic trends in atomic radii.

Answer:

True

Explanation:

A neutral object is an object whose net charge is zero, so the sum of the positive charges is equal to the sum of negative charges:

[tex]Q=Q_{pos}+Q_{neg}=0\\Q_{pos} = -Q_{neg}[/tex]

If the neutral object develops an electric charge (= different from zero), it means that this balance has changed. In particular, usually electric charge is carried by electrons (negative charges), so the object has either gained or lost electrons.

In particular:

- if the object has gained electrons, it has became negatively charged

- If the object has lost electrons, it has became positively charged

1) 26.2 m/s

The mechanical energy of the divers at any point of their vertical motion is sum of the kinetic energy and the gravitational potential energy:

[tex]E=K+U = \frac{1}{2}mv^2 + mgh[/tex]

where

m is the mass of the diver

v is the speed

g = 9.8 m/s^2 is the acceleration due to gravity

h is the height above the water

When the diver is on the cliff, v = 0 (he is at rest), so K=0 and the initial mechanical energy is just potential energy:

[tex]E_i = mgh[/tex]

where h=35 m is the height of the cliff.

When the diver hits the water above, h = 0, so U=0 and the final mechanical energy is just kinetic energy:

[tex]E_f = \frac{1}{2}mv^2[/tex]

since the total mechanical energy is conserved, we have

[tex]E_i = E_f\\mgh = \frac{1}{2}mv^2[/tex]

And solving the equation for v, we find the speed when they reach the surface of the water:

[tex]v=\sqrt{2gh}=\sqrt{2(9.8 m/s^2)(35 m)}=26.2 m/s[/tex]

2) It is converted into thermal energy of the water

When the diver enters the water, he suddenly feels another force acting against the motion of the diver: the resistance of the water. The resistance of the water acts upward, slowing down the diver until he stops.

In this process, the speed of the diver (v) decreases, and therefore the kinetic energy of the diver decreases as well, until it becomes zero.

However, this does not mean that the conservation of energy has been violated. In fact, the kinetic energy of the diver has been converted into thermal energy of the molecules of water surrounding the diver.

1) a) attract

The magnetic force between two magnetic poles is attractive for two unlike poles and repulsive for two like poles. Therefore we have:

1- For two north poles, the force between them is repulsive

2- For two south poles, the force between them is repulsive

3- For a north pole and a south pole, the force between them is attractive

In this problem, we are in the situation described in 3), so the force between the poles is attractive.

2) a) motion of electrons

While electric fields are produced by static electric charges, magnetic fields are produced by charges in motion (currents). In particular, a current in a wire (where a current is simply the motion of electrons inside the wire) produces a magnetic field whose intensity is

[tex]B=\frac{\mu_0 I}{2 \pi r}[/tex]

where

I is the current in the wire

r is the radial distance from the wire

And the direction of the field lines are such that the field form concentric circles around the wire.

Final answer:

A south pole and a north pole of a magnet will attract each other, and a magnetic field is mainly produced by the motion of electrons or the presence of an electric current.

Explanation:

When considering the interaction of magnetic poles, opposite poles indeed attract each other according to magnetic field principles. Specifically, a south pole and a north pole will experience attraction because the magnetic field lines become denser between them, pulling the magnets together. Therefore, the correct answer to the first part of the question is (a) attract.

Regarding what produces a magnetic field, one of the principal sources is the motion of electrons or an electric current. This relationship is observed in electromagnets, where a current flowing through wires creates a surrounding magnetic field. Consequently, the correct answer to the second part of the question is (a) motion of electrons.

Answer: [tex]4.1602(10)^{21} W[/tex]

Explanation:

The Stefan-Boltzmann law establishes that a black body (an ideal body that absorbs or emits all the radiation that incides on it) "emits thermal radiation with a total hemispheric emissive power proportional to the fourth power of its temperature":

[tex]P=\sigma A T^{4}[/tex]   (1)

Where:

[tex]P[/tex] is the energy radiated by a blackbody radiator per second, per unit area (in Watts). Knowing [tex]1W=\frac{1Joule}{second}=1\frac{J}{s}[/tex]

[tex]\sigma=5.6703(10)^{-18}\frac{W}{m^{2} K^{4}}[/tex] is the Stefan-Boltzmann's constant.

[tex]A[/tex] is the Surface of the body

[tex]T=12000K[/tex] is the effective temperature of the body (its surface absolute temperature) in Kelvin .

However, there is no ideal black body (ideal radiator) although the radiation of stars like our Sun is quite close.

Therefore, for the case of the star Rigel, we will use the Stefan-Boltzmann law for real radiator bodies:

[tex]P=\sigma A \epsilon T^{4}[/tex]  (2)

Where [tex]\epsilon=0.955[/tex] is the star's emissivity

Now, firstly we need to find [tex]A[/tex], in the case of Rigel, its surface area can be approximated to a sphere, so:

[tex]A_{Rigel}=4 \pi r^{2}[/tex]   (3)

[tex]A_{Rigel}=4 \pi (5.43(10)^{10}m)^{2}[/tex]

[tex]A_{Rigel}=3.705(10)^{22}m^{2}[/tex]   (4)

Knowing this value, let's substitute it in (2):

[tex]P=(5.6703(10)^{-18}\frac{W}{m^{2} K^{4}})(3.705(10)^{22}m^{2})(0.955)(12000K)^{4}[/tex]  (5)

[tex]P=4.1602(10)^{21}W[/tex]  (6)   This is the total energy radiated by Rigel each second.

To determine the total energy radiated by the star Rigel each second, we can use the Stefan-Boltzmann law. Given the temperature, radius, and emissivity of Rigel, we can calculate the surface area and use it to find the power radiated by the star.

To determine the total energy radiated by the star Rigel each second, we can use the Stefan-Boltzmann law, which states that the power radiated by a black body is proportional to the fourth power of its temperature. The equation is given by:

Power = εσAT⁴

Where ε is the emissivity, σ is the Stefan-Boltzmann constant, A is the surface area of the star, and T is the temperature in Kelvin.

For Rigel, given its temperature (12,000 K), radius (5.43 × 10¹⁰ m), and emissivity (0.955), we can calculate the surface area:

A = 4πr²

A = 4π(5.43 × 10¹⁰)²

The power radiated by Rigel each second is:

Power = (0.955)(5.67 × 10⁻⁸)(4π(5.43 × 10¹⁰)²)(12,000⁴)

Calculate the power to get the answer.

Explanation:

The situation described here is known as polarization by reflection. This was discovered by Scottish physicist David Brewster and then formulated the law that bears his name:

"When a beam of light hits the surface that separates two non-conducting media characterized by different electromagnetic characteristics (electrical permittivity and magnetic permeability), part of it is reflected back to the source medium, and part is transmitted to the second medium."

This polarization happens when the light incides at a specific angle, called the Brewster angle ([tex]\theta_{B}[/tex]), which is given by the following formula (taking into account that generally the magnetic permeabilities of the two media involved do not vary):

[tex]tan\theta_{B}=\frac{n_{2}}{n_{1}}[/tex]     (1)

Where [tex]n_{2}[/tex] is the index of refraction of the second medium (the varnish in this case) and [tex]n_{1}=1[/tex] is the index of refraction of the first medium (the air).

Now, if we are told the angle between the incident and reflected rays is [tex]120\°[/tex], this means the incident angle is the half ([tex]60\°[/tex]), which is the Brewster angle in this case.

So, [tex]\theta_{B}=60\°[/tex]   (2)

Rewriting (1) with this incident ray angle:

[tex]tan(60\°)=\frac{n_{2}}{1}[/tex]   (3)

[tex]n_{2}=tan(60\°)[/tex]  

Finally we obtain the index ofrefraction of the varnish:

[tex]n_{2}=1.732[/tex]

The Brewster's angle formula can help determine the index of refraction of a material based on the angle of reflection. In this case, with a 120° angle, the varnish's refractive index would be around 1.732.

When the angle between the incident and reflected rays is 120°, the index of refraction of the varnish can be calculated using the Brewster's angle formula.

For this scenario, if Brewster's angle is 120°, the refractive index of the varnish would be approximately 1.732.

The concept of Brewster's angle relates the angle of incidence and the refractive index of a material for which the reflected ray is entirely polarized, offering a method to determine the index of refraction of the varnish.

Answer:

n (a neutron)

Explanation:

For a chemical element:

- The lower subscript indicates the atomic number (the number of protons)

- The upper subscript indicates the mass number (the sum of protons and neutrons in the nucleus)

In the reaction described in the problem, we see that a gamma photon hits a nucleus of Calcium-40, which has

Z = 20 (20 protons)

A = 40 (40 protons+neutrons)

Which means that the number of neutrons is n =  A - Z = 40 - 20 = 20

After the reaction, we have a nucleus of Calcium-39, which has

Z = 20 (20 protons)

A = 39 (39 protons+neutrons)

Which means that the number of neutrons is n =  A - Z = 40 - 39 = 19

So, the nucleus has lost 1 neutron, which is the particle missing in the reaction.