A 750-Hz plane sound wave in seawater (13 degree C) is normally incident on a stone seawall. The sound field is found to have a maximum at the wall; the SPL there is 190 dB re 1 muPa. The SPL 0.5 m from the wall is 177 dB. (a) Use the information given about the sound field to find the impedance of the wall. (b) Find the SPL of the incident wave.

Dual convex lenses follow a set of rules that govern their behavior when light passes through them. These rules include:

1. The incoming light rays are refracted (bent) at the first lens surface, causing them to converge towards the optical axis.

2. The converging light rays then pass through the second lens surface and are refracted again, causing them to diverge away from the optical axis.

3. The point where the refracted light rays converge or diverge is known as the focal point.

4. The distance between the lens and the focal point is known as the focal length.

5. The magnification of the image formed by the lens is determined by the ratio of the distance between the object and the lens (object distance) to the distance between the image and the lens (image distance).

Overall, dual convex lenses are powerful tools for bending and focusing light, and they play a crucial role in many fields, from medicine to astronomy.

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Answer:

PE = m g I      change in potential energy of object

PE = 1/2 k I^2      change in potential energy of spring

m g I  = 1/2 k I^2

I = 2 m g / k

The head loss in the duct is 27.39 ft and the pressure drop is 56.9 psi.

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Answer:

Angular Momentum = M * V * R

Angular momentum is constant if there is no force applied along the direction of motion, A is correct here

Answer:

Earth is nearest the Sun in July and farthest away in July.

Explanation:

Answer:

Correct Answer: B.

Explanation:

Earth is nearest the Sun in January and farthest away in July. Explanation: According to Kepler's Second Law, a planet travels fastest when it is nearest its sun. This means that Earth is actually closest to the Sun in January, when it is winter in the northern hemisphere!

Answer:

A. overloading the muscles too often

Overtraining is overloading your muscles.

Overtraining refers to a process when a person continue to exercise despite that he has reach the limit of his ability and ignores the signs of and continues to train. Many believe they need to stress their muscles to be morefit and improve their performance.

Therefore, Overtraining is overloading your muscles.

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The image of the stamp when a magnifying glass with focal length 15 cm is placed 10 cm above a stamp is located 30 cm above the magnifying glass. The correct answer is Option C.

Let the object distance, u be -10cm (since the stamp is placed 10 cm above the magnifying glass).

Let the focal length of the lens, f be 15cm.

So, the magnification, m is given as:

m = v/u (where v is the image distance)

Using the lens formula, we can say that:

1/f = 1/v - 1/u (where v is the image distance and u is the object distance)

Plugging in the given values into the formula we have:

1/15 = 1/v + 1/10

Multiplying both sides of the equation by 30v, we have:

2v = 3(30 - v)

Solving for v, we have:

v = 30/2 = 15 cm

Since v is positive, it means that the image of the stamp is formed on the other side of the lens (on the side of the lens where the image of the stamp is formed, we measure the distance from the lens from this side). Hence, the image is located 15cm from the lens. Since the stamp is located 10 cm above the magnifying glass, the image of the stamp is located 15 + 10 = 25cm above the object or the magnifying glass. Thus, the correct option is c. 30 cm above the magnifying glass.

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              J = I / (4πR²),

             B(r) = μ0 I / (2πr),

              B(r) = μ0 I r² / (2 R³),

(a) The current density on the sphere can be found by dividing the total current by the surface area of the sphere.

               J = I / (4πR²)

(b) Due to the symmetry of the problem, the magnetic field will have no φ-component, and will only depend on the radial distance r and the polar angle θ.

By Ampère's law,

     The magnetic field at a point P inside the sphere of radius R can be found by integrating the current density J over a circular path C around the z-axis passing through P:

             ∮C B · dl = μ0 Ienc

where,

Since the current is distributed uniformly over the surface of the sphere, we can take a surface S with the same circular path C as its boundary.

Then, Ienc is equal to the total current passing through the sphere, which is equal to I.

By symmetry,

                         B = B(r) ẑ,

where,

                       B(r) ∫C dl = B(r) 2πr = μ0 I

               B(r) = μ0 I / (2πr)

(c) At the surface of the sphere, the magnetic field must be continuous across the boundary.

Therefore, we need to evaluate the magnetic field both inside and outside the sphere and make sure they match at r = R.

For r < R, we have:

                  B(r) = μ0 I / (2πr)

For r > R, the magnetic field is due to the current flowing on the surface of the sphere.

By Ampère's law,

               J = I / (4πR²),

             Ienc = J π r²

               B(r) ∫C dl = B(r) 2πr = μ0 Ienc

           B(r) = μ0 I r² / (2 R³)

          B(R) = μ0 I / (2πR) = μ0 I R / (2πR²) = μ0 J R

which is the same as the magnetic field due to the current density on the surface of the sphere.

Therefore, the magnetic field is continuous across the surface of the sphere, and our solution satisfies the magnetic field matching conditions.

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The aliens will notice the rotational motion of planets on their axis and revolution of the planets around the sun (star).

The sun and the planets are roughly in the same plane .

The first motion aliens will notice will be the rotation of the planets on their vertical axis. Each planet have different rotational speed , which results in the formation of day and night on each planet

The second motion they will notice will be the revolution of the planets around the sun(star) and the revolution of the moons of the planets around the planets. The path of revolution of each planet is fixed and is elliptical in shape also known as an orbit . During one single revolution each planet comes near the sun twice. Also the size of the elliptical path of each planet is not the same .

One more special motional observation that they will see , will be the helical motion of the planets as the entire solar system moves at an angle of 60 degree between the galactic plane and the planetary orbital plane

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To calculate the amount of energy carried by a wave through a window during a 30.0-s commercial, we need to know the power of the wave and the time for which it is passing through the window.

The power of a wave is given by the formula P = E/t, where P is power, E is energy, and t is time. Therefore, to calculate the energy carried by the wave, we can rearrange this equation to E = P x t. However, we need to know the power of the wave first. This information is not provided in the question, so we cannot calculate the energy carried by the wave without additional data.

If the intensity (I) and area (A) are provided, we can calculate the power (P) of the wave using the formula P = I * A. Then, we can find the energy (E) carried by the wave during the 30.0-s commercial by using the formula E = P * t, where t is the time in seconds.

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Answer:

A. respiration.

Explanation:

Cellular respiration can be defined as a series of metabolic reactions that typically occur in cells so as to produce energy in the form of adenosine triphosphate (ATP). During cellular respiration, high energy intermediates are created that can then be oxidized to make adenosine triphosphate (ATP). Therefore, the intermediary products are produced at the glycolysis and citric acid cycle stage.

Additionally, mitochondria provides all the energy required in the cell by transforming energy forms through series of chemical reactions; breaking down of glucose into Adenosine Triphosphate (ATP) used for providing energy for cellular activities in the body of living organisms.

Basically, oxygen goes into the body of a living organism such as plants, humans and animals when they breathe while glucose is absorbed by the body when they eat.

Hence, the conversion of sugar to energy in the presence of oxygen is respiration.

The three wavelengths that will produce standing waves on this string are 4 m, 2 m, and 1.33 m.

To find the wavelengths that will produce standing waves on a stretched string fixed at both ends, we can use the formula:

λn = 2L/n

where λn is the wavelength of the nth harmonic, L is the length of the string, and n is the harmonic number.

For the fundamental frequency (n = 1), the wavelength would be:

λ1 = 2L/1 = 4 m

For the second harmonic (n = 2), the wavelength would be:

λ2 = 2L/2 = L = 2 m

For the third harmonic (n = 3), the wavelength would be:

λ3 = 2L/3 ≈ 1.33 m

So, the three wavelengths that will produce standing waves on this string are 4 m, 2 m, and 1.33 m.

Now, for a wavelength that would not produce a standing wave pattern, we can consider the case where the wavelength is equal to the length of the string, i.e., λ = L. In this case, the wave will not produce a standing wave pattern because the ends of the string are fixed nodes, and the only possible standing wave pattern is one that has a node at each end. If the wavelength is equal to the length of the string, the only possible pattern would be a single wave with an antinode at the center, which is not a standing wave.

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In a parallel circuit, the total current flowing through the circuit is equal to the sum of the currents through all the individual branches.

In a parallel circuit, the current has multiple paths or branches to flow through. Each branch provides a separate path for the current to follow. The total current flowing into the circuit is divided among these branches, with each branch carrying a portion of the total current.

To calculate the total current in a parallel circuit, you simply add up the currents flowing through each branch. Mathematically, it can be expressed as:

Total Current = Current in Branch 1 + Current in Branch 2 + ... + Current in Branch n

In a parallel circuit, the total current flowing through the circuit is equal to the sum of the currents through all the individual branches. This is because the current has the freedom to divide and flow through multiple paths in parallel, resulting in the sum of currents being equal to the total current.

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Answer:

Speed = 3·10⁸ m/s

Explanation:

Given:

λ = 700 nm = 700·10⁻⁹ m

ν = 4.285·10¹⁴ Hz

_______________

V - ?

The speed of red light:

V = λ·ν

V = 700·10⁻⁹·4.285·10¹⁴ ≈ 3·10⁸ m/s

Photons are massless.

What is electromagnetic radiation?

Electromagnetic radiation consists of electromagnetic field-propagating waves that carry electromagnetic radiant energy. Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays are included. All of these electromagnetic waves comprise the electromagnetic spectrum.

Given that:

E= Energy

h= Plank's constant = 6.6*10^-34 Js

c= speed of light = 3*10^8 m/s

E=hv = hc/λ

λ=745 nm = 745*10^-9 m

E=6.6*10^-34 * 3*10^8/745*10^-9

E= 2.657* 10^19 = 2.66* 10^19 J

hence, the energy of one photon of this light is 2.66* 10^19 J

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Correct question:

Electromagnetic radiation with a wavelength of 745 nm appears as a red light to the human eye. The energy of one photon of this light is...............  A) 2.67 x 10-28 B) 2.67 x 10-19 C) 1.48 x 10-22 D)1.48 × 10-31 E) 3.75 × 1018

The magnitude of the direction of the resultant vector R = F+G is 38.47 N, which is the length of the hypotenuse formed by the components of the two vectors.

To find the magnitude of the direction of the resultant vector R = F + G where F is a 20N vector directed 65 north of east and G is a 30N vector directed east, we will use Pythagoras theorem as well as some trigonometric ratios.Let's first find the x and y components of each vector:We can get the x and y components of vector F using trigonometry:$$\begin{aligned} F_x &= F \cos \theta \\ F_x &= 20 \cos (65^\circ) \\ F_x &= 20 \times 0.4226 \\ F_x &= 8.45 \ \text{N} \\ F_y &= F \sin \theta \\ F_y &= 20 \sin (65^\circ) \\ F_y &= 20 \times 0.9063 \\ F_y &= 18.126 \ \text{N} \end{aligned} $$We can also get the x and y components of vector G, noting that it has no y component since it is directed east:$$\begin{aligned} G_x &= G \cos \theta \\ G_x &= 30 \cos (0^\circ) \\ G_x &= 30 \times 1 \\ G_x &= 30 \ \text{N} \\ G_y &= G \sin \theta \\ G_y &= 30 \sin (0^\circ) \\ G_y &= 30 \times 0 \\ G_y &= 0 \ \text{N} \end{aligned} $$Next, we add the x and y components to get the components of the resultant vector:$$\begin{aligned} R_x &= F_x + G_x \\ R_x &= 8.45 + 30 \\ R_x &= 38.45 \ \text{N} \\ R_y &= F_y + G_y \\ R_y &= 18.126 + 0 \\ R_y &= 18.126 \ \text{N} \end{aligned} $$Finally, we use the Pythagorean theorem to get the magnitude of the resultant vector:$$\begin{aligned} R &= \sqrt{R_x^2 + R_y^2} \\ R &= \sqrt{38.45^2 + 18.126^2} \\ R &= \sqrt{1481.2901} \\ R &= 38.47 \ \text{N} \end{aligned} $$

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Some ways to prevent incorrect installation of wires on a PCBA include colour-coding, labelling, using keyed connectors, and providing clear documentation and instructions for proper wire routing.

Colour-coding, labelling, and keyed connectors are three common ways to prevent incorrect installation of wires on a PCBA. Colour coding can be used to designate which wire goes to which terminal or connector, and can be especially helpful when working with multiple wires. Labels can be affixed to the wires or the PCB to provide additional guidance on proper wire routing and connections. Keyed connectors can also be used to prevent incorrect installation by ensuring that the connector can only be inserted one way. Clear documentation and instructions can also be provided to aid in proper wire routing and installation. These methods can help reduce the likelihood of errors during the installation process and improve the overall reliability and functionality of the PCB.

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Answer:

1.It improved by using the Mars survey probe, that took a portrait of the planet that helped us see the climate of Mars.

Explanation:

I watched the video.

Answer:The net force for A. Is 2 and the resultant motion is up

B. NET force: 2 resultant motion: left

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C. Net force: 3 Resultant motion: Left

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D. Net Force: 7 Resultant motion: right

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E. Net Force:0 resultant motion: NO MOTION

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F. NET Force: 3 resultant motion: Down

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G. NET FORCE: 10 resultant motion: up

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H. Net force: 3 Resultant motion: left

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I. Net force: 50 Resultant motion: right

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J. NET FORCE: 75 Resultant motion: down

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K. Net force :200 Resultant motion: Right

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L. force: 0 resultant motion:No motion

Explanation:

A load cell is an essential sensor device used for converting a force, torque, pressure, or displacement into an electrical signal. It is a key component in electronic scales, force measuring instruments, and weighing devices. A student who designs an electric scooter uses a simple column type load cell with two strain gauges.

The load cell measures force or weight by converting the tension or compression acting on the load cell into an electrical signal. A load cell typically comprises four strain gauges that are arranged in a Wheatstone bridge configuration. A column type load cell is cylindrical in shape and is designed to measure loads in compression. It typically comprises two columns that are connected by a metal diaphragm. Two strain gauges are attached to the columns, one for measuring the compressive strain and the other for measuring the tensile strain.

The student designing an electric scooter uses a load cell to measure the weight of the rider and other loads on the scooter. The load cell is typically placed at the bottom of the scooter's frame, and the weight of the rider and the scooter is applied to it. The load cell measures the weight by converting the compression force acting on it into an electrical signal. The two strain gauges attached to the columns of the load cell measure the compressive and tensile strains, respectively. These strains are converted into an electrical signal using a Wheatstone bridge circuit, and the output of the bridge is proportional to the weight applied to the load cell.The student designing the electric scooter needs to select the right load cell for the application. The load cell must be able to measure the maximum weight that the scooter can carry. The column type load cell is suitable for measuring loads in compression, which is ideal for measuring the weight of the rider and the scooter. The two strain gauges attached to the columns of the load cell help to increase the sensitivity and accuracy of the load cell. The Wheatstone bridge circuit helps to convert the strain measurements into an electrical signal that can be processed by the scooter's control system.

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Answer:

Law 2:

Pushing a baby on a swing is easier than pushing an adult on the same swing. Water spills from a glass carried by someone who is walking steadily and suddenly stops short.

Law 2:

When thrown with the same force, a soccer ball accelerates more than a bowling ball.

Law 1:

A magician pulls a tablecloth out from under a dish on a table without disturbing the dish.

Law 3:

A rocket launches into space, pushing fuel exhaust in one direction and the rocket in the opposite direction.

Law 1:

A book rests on top of a shelf and does not move until a student accidentally knocks it off.

Explanation:

Newton's laws of motion:

Law 1: Law of inertia

Law 2: Law of force (F = mass x acceleration)

Law 3: Law of Action & Reaction

The laws followed by the given situations are Newton's law of force, Law of inertia and Newton's third law.

Inertia is defined as the tendency of an object to continue its state of rest or motion.

Here,

Considering the situations given,

1. Pushing a baby on a swing is easier than pushing an adult on the same swing.

This is because, the mass of the baby is lesser than that of the adult. So, according to Newton's force equation,

Force, F = ma

Therefore to push a body with more mass, more force should be applied.

Another situation that follows this law from the given situations is:

When thrown with the same force, a soccer ball accelerates more than a bowling ball.

2. Water spills from a glass carried by someone who is walking steadily and suddenly stops short.

This is due to the inertia of the water in the glass. This can be explained by law of inertia.

Another situation that follows this law from the given situations is:

A magician pulls a tablecloth out from under a dish on a table without disturbing the dish.

A book rests on top of a shelf and does not move until a student accidentally knocks it off.

3. A rocket launches into space, pushing fuel exhaust in one direction and the rocket in the opposite direction.

This is according to Newton's third law of motion. The law of action and reaction.

Hence,

The laws followed by the given situations are Newton's law of force, Law of inertia and Newton's third law.

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Answer:

I think C? I'm not sure totally though...

Explanation:

The probability of stopping at a traffic light is about 47.22%.

With 10 traffic lights, expect to be stopped for approximately 5 minutes and 45 seconds along the main street.

(a) To calculate the probability of stopping at a particular traffic light, we need to consider the cycle time of the traffic lights. The cycle time is the total time taken for one complete sequence of green, amber, and red signals. In this case, the cycle time is 55 + 17 + 48 = 120 seconds.

The probability of stopping at a particular traffic light can be calculated by dividing the red signal duration by the cycle time. Therefore, the probability is 48/120 = 0.4 or 40%.

However, in California, no one stops on amber, so we need to exclude the amber duration from the calculation. Therefore, the probability becomes 48/(55 + 48) ≈ 0.4722 or 47.22%.

(b) If there are 10 traffic lights on the main street, we can calculate the expected amount of time spent stopped at traffic lights by multiplying the probability of stopping at each traffic light by the average duration of being stopped.

The average duration of being stopped at a traffic light is the sum of the red signal duration and half of the amber signal duration. So, the average duration is (48 + 17/2) = 56.5 seconds. To find the expected amount of time stopped at traffic lights, we multiply the average duration by the number of traffic lights: 56.5 seconds * 10 = 565 seconds.

Therefore, if you drive all the way down the main street, the expected amount of time you are likely to be stopped at traffic lights is approximately 565 seconds, which is equivalent to 5 minutes and 45 seconds.

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Answer:

\(36 g/cm^{3}\)

Explanation:

In order to find the density, the problem says we need to find the volume first.

Since we know that the sample of gold is a perfect cube, we know that the side lengths will all be the same. Since all the side lengths will be 3, we can take that value and cube it to find the volume.

\(3^{3} = 27\)

Now that we know the volume is 27 cm³, we can solve find the density.

\(Density = \frac{Mass}{Volume}\)

\(Density = \frac{972g}{27cm^{3} } = 36 g/cm^{3}\)

Therefore, the density of the sample is 36 g/cm³.

Answer:

D). Insulator —> semiconductor —> conductor—> superconductor

Explanation:

The sequence list of types of materials in order from least conducive to the most conductive is: the insulator, semiconductor, conductor, and superconductor. Conductors are materials where electric current can flow freely; whereas, in insulators, electric current cannot. Examples of conductors are metals and water. Examples of insulators are plastics, papers, and rubbers.

Answer:

ya its D

Explanation:

Stars form from molecular clouds through a process known as stellar formation.

These clouds, characterized by low temperatures and high densities, provide the ideal conditions for atoms to combine and form molecules. With a mass range spanning from a few solar masses to millions of solar masses, molecular clouds serve as the birthplaces of new stars. The Pleiades cluster serves as a notable example of stars that have recently formed within such a stellar nursery.

The formation of stars from molecular clouds involves several key steps. Firstly, gravitational forces acting on regions of higher density within the cloud cause them to collapse under their own gravity. As the cloud collapses, it begins to fragment into smaller, denser clumps called protostellar cores. These cores continue to collapse, and their central regions become increasingly dense and hot. At this stage, they are known as protostars.

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The bicycle wheel will rotate at a rotational velocity of 6 revolutions per second after 4 seconds. The wheel will turn 12 revolutions during this time.

a) If a bicycle wheel is rotationally accelerated at a constant rate of 1.5 rev/s², and it starts from rest, then its rotational velocity after 4 seconds is 6 revolutions per second.  

Angular acceleration is calculated by the formula

α = Δω/Δt = (ωf - ωi)/t

where α is angular acceleration, Δω is the change in angular velocity, and Δt is the change in time.

ωi = initial angular velocity

    = 0

ωf = final angular velocity

α = 1.5 rev/s²

t = 4 s

ωf = αt + ωi

    = 1.5 rev/s² x 4 s + 0

    = 6 rev/s

b) Through how many revolutions does it turn in this time

Angular displacement is calculated by the formula

θ = ωit + ½αt²

Where θ is angular displacement, ωi is the initial angular velocity, t is time, and α is angular acceleration.

ωi = 0

α = 1.5 rev/s²

t = 4 s

θ = ωit + ½αt²

θ = 0 + ½ x 1.5 rev/s² x (4 s)²

  = 12 revolutions.

Hence, the bicycle wheel will rotate at a rotational velocity of 6 revolutions per second after 4 seconds. The wheel will turn 12 revolutions during this time.

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Answer:

What is the difference between a prominence and a solar flare? A prominence is a loop of cool incandescent gas that extends above the photosphere. A solar flare is an explosive release of energy that comes from the sun and causes magnetic ditrubances.

Explanation:

The hydrogen-fusing lifetime of a star with a mass 1.3 times that of the sun, which shines with a luminosity that is 3.2 times that of the sun is about 225 million years (Myr).

The hydrogen-fusing lifetime of a star with a mass 1.3 times that of the sun, which shines with a luminosity that is 3.2 times that of the sun is about 225 million years (Myr).Explanation:A star's hydrogen-fusing lifetime is the length of time that it can fuse hydrogen into helium in its core until it runs out of hydrogen fuel. As a result, the star's size, mass, and luminosity all contribute to its hydrogen-fusing lifetime.Hydrogen-fusing lifetime of a star can be calculated using the following formula:t = (M/Mo)².5 (L/Lo)^-3.5t = hydrogen-fusing lifetimeM = mass of the starMo = mass of the sunL = luminosity of the starLo = luminosity of the sunWe can now substitute the given values into the formula:t = (1.3/1)^2.5 (3.2/1)^-3.5t = 225 MyrTherefore, the hydrogen-fusing lifetime of a star with a mass 1.3 times that of the sun, which shines with a luminosity that is 3.2 times that of the sun is about 225 million years (Myr).

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a. If the separation between two charged bodies is doubled, then the force between them will become one-fourth of its initial value. According to Coulomb's law, the force (F) between two charged bodies is given by: `F = (kq₁q₂)/r²`Where k is the Coulomb's constant, q₁ and q₂ are the magnitudes of charges, and r is the separation distance between the charges.

Now, if the separation distance is doubled, then the new separation distance would be 2r. Hence, the new force between them will be: `F' = (kq₁q₂)/(2r)²` = `(kq₁q₂)/4r²`Therefore, the force between them if the separation is doubled will be one-fourth of its initial value. b. If the separation between two charged bodies is halved, then the force between them will become four times of its initial value. Now, if the separation distance is halved, then the new separation distance would be r/2. Hence, the new force between them will be: `F'' = (kq₁q₂)/(r/2)²` = `(kq₁q₂)/(r²/4)` = `4(kq₁q₂)/r²`Therefore, the force between them if the separation is halved will be four times its initial value.

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