2. how many times a minute does a boat bob up and down on ocean waves that have a wavelength of 36.0 m and a propagation speed of 4.80 m/s?

The speed of waves on the slinky is 2.42 m/s.

The speed of a wave is the distance it travels in a given amount of time.

The speed of waves on the slinky can be calculated using the equation:

v=fλ

where v is the wave speed, f is the frequency, and λ is the wavelength).

Using the given values of f=4.4 Hz and λ=0.55 m, we can calculate the speed of the wave to be 2.42 m/s.

So, the wave is traveling at a speed of 2.42 m/s, which means that it will travel 2.42 meters in one second.

The frequency of the wave is 4.4 Hz, which means that the wave completes one cycle in 0.23 seconds. Since the wave is traveling at a speed of 2.42 m/s, this means that it will take 0.23 seconds for the wave to complete one cycle.

Therefore, the speed of waves on the slinky traveling with a frequency of 4.4 Hz and having a wavelength of 0.55m  is 2.42 m/s.

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Answer:

Explanation:

Durante as aulas, os estudantes da 3ª série deveriam escolher uma entre as três atividades físicas possíveis, sendo elas: natação, futsal e dança. Na turma, 25% escolheram dança, 15% escolheram natação, e os outros 24 estudantes escolheram futsal. Podemos afirmar que, nessa turma, existe um total de:

A) 64 alunos

B) 55 alunos

C) 48 alunos

D) 45 alunos

E) 40 alunos

The sound level produced by a chorus of 45 singers would be approximately 88.3 dB.

Assuming that the sound level of each singer is independent and the same, the sound level produced by a chorus of 45 singers can be calculated using the following formula:

L2 = L1 + 10 log (N2/N1)

where:

L1 = the sound level of one singer = 71.8 dB

N1 = the number of singers in the original group = 1

N2 = the number of singers in the new group = 45

L2 = the sound level of the new group

Substituting the values in the formula, we get:

L2 = 71.8 + 10 log (45/1)

L2 = 71.8 + 10 log (45)

L2 = 71.8 + 16.5

L2 = 88.3 dB

Therefore, the sound level produced by a chorus of 45 singers would be approximately 88.3 dB, assuming all the singers are singing at the same intensity at approximately the same distance as the original singer.

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Answer:

The Ability to do work

Explanation:

energy is needed to do work because without energy no work can be done due to the fact that there is no energy

The bike and rider must halt at a breaking distance of 5.17 meters.

d=2.2v+fracv220 gives the braking distance, in feet, of a car moving at v miles per hour. Most motorcycle riders have a maximum braking force (what an experienced rider can do) of about 1 G, which, at 45 mph, results in a complete stop of the motorcycle in 67 feet (20 meters).

To resolve this issue, we can apply the equation of motion for uniformly accelerated motion:

v² = u² + 2as

To solve for s, we can rewrite the equation as follows:

s = (v² - u²) / (2a)

We are aware that the acceleration is determined by dividing the net force by the mass:

a = F_net / m

where m is the mass and F net is the net force.

a = F_net / m = -140 N / 82.0 kg

= -1.71 m/s²

We may now change the values for s in the equation:

s = (0² - 4.2²) / (2*(-1.71))

= 5.17 m

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The normal-mode wavelengths decrease when the air in an organ pipe is replaced by helium, at the same temperature. This is because helium has a lower molar mass than air, and therefore a lower speed of sound, which causes the normal-mode wavelengths to decrease.

The normal-mode wavelengths are determined by the length of the pipe L and the speed of sound in the pipe

V.λn = 2L/nVn is the index of the mode, which can be any integer.

When helium is used instead of air, the speed of sound in the pipe rises because the mass of the helium molecules is smaller than that of the air molecules, so the gas molecules must travel quicker to achieve the same speed. Because the wavelength of a standing wave must fit into the pipe precisely, the increase in velocity causes the wavelength to decrease. The normal-mode wavelengths will be lowered as a result of this.

Thus, the answer is the normal-mode wavelengths decrease.

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The given statement "centripetal force in a collapsing cloud of gas and dust is strongest at the poles" is - True.

Centripetal force refers to a force that drives an object toward a fixed point, which is the center of a circular path. For example, if you tie a ball to a string and whirl it around in a circle, the string exerts a centripetal force on the ball that keeps it moving in a circle.

The force of gravity is the most common centripetal force that we encounter in nature, and it is what drives the movement of planets, moons, and other celestial objects.

During the formation of a star, a cloud of gas and dust collapses inwards due to gravity. The cloud starts to rotate as it shrinks due to the law of conservation of momentum. The centripetal force in this situation is the gravitational force that holds the cloud together.

The gravitational force, on the other hand, is stronger at the poles of the cloud. The gravitational force increases as the distance between the particles in the cloud decreases. Because the poles of the cloud are closer together, the gravitational force is stronger, and the centripetal force is also stronger.

As a result, the centripetal force in a collapsing cloud of gas and dust is strongest at the poles.

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At the instant where the cart leaves the ramp, the velocities of the ramp and the cart are relative to the ground as [tex](mgh/m+M)^{1/2}[/tex] and [tex](2gh(m+M)/3m)^{1/2}[/tex] respectively.

The velocities of the ramp and cart relative to the ground at the instant the cart leaves the ramp can be calculated using conservation of energy and momentum. The velocity of the cart relative to the ground can be found using conservation of energy as follows:

mgh = 1/2mv² + 1/2Iw²

where m is mass of cart, g is acceleration due to gravity, h is height of ramp, v is velocity of cart relative to ground, I is moment of inertia of ramp about its center of mass and w is angular velocity of ramp about its center of mass.

The velocity of ramp relative to ground can be found using conservation of momentum as follows:

mv = (m+M)V

where M is mass of ramp and V is velocity of ramp relative to ground.

Solving these equations simultaneously gives:

[tex]V = mgh/(m+M)^{1/2}[/tex]

[tex]v = 2gh(m+M)/(3m)^{1/2}[/tex]

where h = height of ramp.

Therefore, at the instant when cart leaves the ramp, velocity of cart relative to ground will be [tex](2gh(m+M)/(3m))^{1/2}[/tex] and velocity of ramp relative to ground will be [tex](mgh/(m+M))^{1/2}[/tex].

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Answer:

To find the average speed after 2 minutes, we need to calculate the total distance covered in 2 minutes and divide it by 2.

Total Distance after 2 minutes = 75m

Total Time after 2 minutes = 2 minutes

Average Speed after 2 minutes = Total Distance / Total Time

Average Speed after 2 minutes = 75m / 2 min = 37.5 m/min

Therefore, the average speed after 2 minutes is 37.5 m/min.

I Hope This Helps!

The time it takes for the electrons to get from the car battery to the starting motor is 353 ms.

To calculate the time it takes for electrons to get from a car battery to the starting motor, we can use Ohm's law. According to Ohm's law, the current (I) through a wire is equal to the voltage (V) divided by the resistance (R). In this case, the current is 300A and the resistance is equal to the resistance of the copper wire (R = ρL/A), where ρ is the resistivity of copper, L is the length of the wire, and A is the cross-sectional area. Using this information, the resistance of the copper wire is 0.85Ω. Therefore, the time it takes for the electrons to get from the car battery to the starting motor is equal to the voltage divided by the resistance, or 300V/0.85Ω = 353 ms.
To explain further, current is a measure of the amount of electrons passing through a conductor, in this case the copper wire, in a certain amount of time. Voltage is a measure of the energy per unit of charge, meaning it is how much energy each electron will have when it passes through the wire. Resistance is a measure of the opposition that a material has to the flow of electric current. In this case, the resistance of the copper wire is equal to the resistivity of the copper, multiplied by the length of the wire, divided by the cross-sectional area of the wire. Using this information, the time it takes for the electrons to get from the car battery to the starting motor can be calculated as 300V/0.85Ω = 353 ms.

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The projectile will be moving at a speed of 57.21 m/s when it reaches the top of its trajectory.

When a projectile is fired at a speed of 138 and an upward angle of 65 degrees, the speed at the top of the trajectory can be calculated. To solve this problem, you need to understand some basic physics concepts. Here's how you can solve this problem:
1. First, identify the given values and write them down:
Initial velocity (u) = 138 m/s
Angle of projection (θ) = 65 degrees
Acceleration due to gravity (g) = 9.81 m/s²
2. Now, break down the initial velocity into its horizontal and vertical components:
Initial velocity in the horizontal direction = u cos θ
Initial velocity in the vertical direction = u sin θ
3. Use the equation of motion to calculate the time taken by the projectile to reach the top of its trajectory:
u sin θ = gt/2
t = 2u sin θ/g
4. Use the time obtained in step 3 to calculate the velocity at the top of the trajectory:
v = u cos θ
Where,
v = final velocity
u = initial velocity
θ = angle of projection
5. Substitute the given values in the equation to get the final answer:
v = u cos θ
v = 138 cos 65
v = 57.21 m/s
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If the conducting cube is changed or replaced with other one has a positive charge carriers then there will be no change in electric field.

The direction of the generated electric field remains the same, opposing the change in magnetic flux, if the conducting cube is switched out for a conducting cube with positive charge carriers.

This is caused by the electromagnetic induction law of Faraday, which states that a shifting magnetic field causes a shifting electric field. Lenz's law states that the generated electric field always operates in the opposite direction to the change in magnetic flux that caused it.

The right-hand rule for electromagnetic induction should be used to identify the direction of the generated electric field. The thumb of the right hand points towards the direction of the shifting magnetic field if the fingers are curled in this manner.

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The minimum elevation angle necessary to hit the target 4050 feet away with a muzzle velocity of 1000 feet per second is 45 degrees.

Let α be the angle of elevation at which the gun is aimed.

Then, tan α = Opposite Side / Adjacent Side

tan α = 4050 / (1000 * time of flight)

Let h be the target's height above the gun's level.

Since the target's altitude is unknown, we'll assume it to be h = 0.

Since the gun is fired horizontally, its initial velocity has no vertical component. In the vertical direction, the projectile is influenced solely by gravity.

Since the horizontal distance traveled by the projectile is 4050 feet and the initial velocity is 1000 feet per second,

t = (4050 / 1000) seconds

On substituting the value of t,

we get, tan α = 4050 / (1000 * 4.05)

tan α = 1

Therefore, the angle of elevation of the gun is 45°.

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A metal object is suspended from a spring scale are: the three forces acting on the submerged object are buoyant force, gravitational force, and tension force. The gravitational force is responsible for pulling the object downwards. The buoyant force is responsible for pushing the object upwards due to the density of the liquid. The tension force is responsible for maintaining the equilibrium of the object.

To find the volume of the object, we need to use the formula: Volume of the object = Mass of the object / Density of the object .The mass of the object can be calculated using the gravitational force: Mass of the object = Gravitational force / Acceleration due to gravity (g)Mass of the object = 920 N / 9.8 m/s²Mass of the object = 93.87 kg.

The density of the object can be calculated using the formula: Density of the object = Mass of the object / Volume of the object. The volume of the object can be calculated using the equation: Volume of the object = (Gravitational force - Buoyant force) / Density of the fluid Volume of the object = (920 N - 750 N) / (1000 kg/m³)Volume of the object = 0.17 m³c. Now we have the mass and volume of the object.

Using these values, we can calculate the density of the metal using the formula: Density of the object = Mass of the object / Volume of the object Density of the object = 93.87 kg / 0.17 m³Density of the object = 552.76 kg/m³The density of the metal is 552.76 kg/m³.

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If both elements of the water heater in this residence are energized at the same time, they will draw 37.5 amperes of current. Each element of the water heater is rated at 240 volts at 4500 watts.

To calculate the current drawn by each element, we can use Ohm's law: V = IR, where V is the voltage, I is the current, and R is the resistance.
The resistance of each element can be calculated using the formula: [tex]R = V^2/P[/tex], where R is the resistance, V is the voltage, and P is the power.
So, the resistance of each element is:
[tex]R = V^2/P[/tex]
[tex]R = 240^2/4500[/tex]
R = 12.8 ohms
When both elements are energized at the same time, they are connected in parallel. The total resistance of two resistors in parallel can be calculated using the formula:
1/R_total = 1/R1 + 1/R2
So, the total resistance of the two elements is:
1/R_total = 1/12.8 + 1/12.8
1/R_total = 0.15625
R_total = 6.4 ohms
Now, we can use Ohm's law to calculate the current drawn by both elements:
I = V/R_total
I = 240/6.4
I = 37.5 amperes

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The relationship between force and potential energy can be found using: calculus and examining the graph of the equation PE = Fd

Potential energy is a form of stored energy that results from the force of gravity or from a conservative force. The relationship between force and potential energy is described by the equation PE = Fd, where PE is potential energy, F is force, and d is displacement.

To calculate potential energy using calculus, start by taking the integral of force with respect to displacement. This will give you the work done by the force, which is equal to the potential energy. Mathematically, this is represented as PE = ∫Fd. This equation can be used to find the potential energy of an object if you know the force and the displacement.

The relationship between force and potential energy can also be determined by examining the graph of the equation PE = Fd. This graph is a straight line with a slope of d and a y-intercept of zero. The slope of the line represents the displacement, while the y-intercept represents the potential energy.

As the force increases, the potential energy increases by the same amount as the force multiplied by the displacement. In summary, the relationship between force and potential energy can be found using calculus. The equation PE = Fd can be used to calculate potential energy from force and displacement.

The graph of this equation is a straight line with a slope of d and a y-intercept of zero, and it shows that as the force increases, the potential energy increases by the same amount as the force multiplied by the displacement.

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The impulse given to the nail is -101.527616 J (Joules).

The impulse given to the nail if a 13-kg hammer strikes a nail at a velocity of 7.8 m/s and comes to rest in a time interval of 8.4 ms is calculated using the formula J = FΔt.

Here, F is the force, Δt is the time interval, and J is the impulse. Use the given information to solve the question. Here, m/s stands for meters per second, and ms stands for milliseconds.

F = maF = m (Δv / Δt)

where, m is the mass of the hammer, and Δv is the change in velocity of the hammer.

Δv = -7.8 m/s (negative because the hammer is coming to rest)

Δt = 8.4 ms = 0.0084 s

F = 13 kg x (-7.8 m/s) / 0.0084 sF = -12095.24 N

The force exerted on the nail is -12095.24 N.

The impulse given to the nail is J = FΔt.

J = -12095.24 N x 0.0084 sJ = -101.527616 J (Joules)

Therefore, the impulse given to the nail is -101.527616 J (Joules).

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The orbital radius at which a satellite would maintain a constant position with the Jupiter is equal to 7.14 x 10^6 meters.

Jupiter is the largest planet in our solar system. To determine the radius at which a satellite would maintain a constant position, we first need to determine the time it takes for a satellite to complete one orbit around Jupiter and then relate it to the radius using the Kepler's law of planetary motions.

According to Kepler's third law, the period of a planet's orbit squared is equal to the size semi-major axis of the orbit cubed when it is expressed in astronomical units. The relation between different parameters can be given as follows:

T^2 = (4π^2 / GM) x R^3

where: T = the time it takes for the satellite to complete one orbit

M = the mass of Jupiter

R = the radius of orbit

G = the gravitational constant

To maintain a constant position, the orbital radius of the satellite must be same as that of Jupiter which is equal to 0.41 days. Substituting the values in the above equation and solving for R, we get:

R^3 = T^2 x (GM/4π^2)

⇒ R^3 = [tex]R^3 = \frac{(6.6743 * 10^-11)(1.898*10^27)}{4(3.14)^2} *(0.41)^2[/tex]

∴ R ≅ 7.14 x 10^6 meters

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The relationship between the index of refraction and the speed of light in a medium is that the higher the index of refraction is: the slower the speed of light in that medium

The index of refraction is a measure of how much a light ray is bent, or refracted, as it enters a material or medium. The amount of refraction increases as the index of refraction increases, which in turn causes light to travel slower in the medium.

The index of refraction is related to the speed of light in the medium because the amount of refraction affects the speed of light in that medium. The index of refraction is a ratio between the speed of light in a vacuum and the speed of light in a medium.

This is calculated as the speed of light in a vacuum (c) divided by the speed of light in the medium (v). This ratio is usually represented as n, and so the formula for the index of refraction is: n = c/v. As the index of refraction increases, the speed of light in the medium decreases.

In a medium with a low index of refraction, the speed of light is higher than in a medium with a higher index of refraction. This is because a low index of refraction means that the light ray is not being refracted very much, so it is able to travel faster.

A higher index of refraction means that the light ray is being refracted more, so it is forced to travel slower. This explains the relationship between the index of refraction and the speed of light in a medium; the higher the index of refraction, the slower the speed of light in that medium.

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We can see here that correctly completing this prompt, we have:

Current is produced in a conductor when it is moved through a magnetic field. This process of  applying a force on the free electrons  in the conductor and causing them to move.

This process of generating current in a conductor by placing the conductor in a changing magnetic field is called induction. There is no physical connection between the conductor and the magnet. The conductor, which is often a piece of wire, must be perpendicular to the magnetic lines of force in order to produce the maximum force on the free electrons.

In physics, current refers to the flow of electric charge in a circuit. It is measured in amperes (A) and is defined as the amount of charge that passes through a point in a circuit per unit time. In other words, current is the rate of flow of electric charge.

Current can flow through a variety of materials, such as wires or conductive solutions, and is driven by a potential difference, or voltage, between two points in a circuit.

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The resistance of the given aluminum bar is approximately [tex]1.62 \times 10^{-4} \ \Omega m[/tex].

To calculate the resistance of the aluminum bar, we need to use the formula:

[tex]R = (\rho \times L) / A[/tex]

Where R is the resistance, ρ is the resistivity of aluminum, L is the length of the bar, and A is the cross-sectional area of the bar.

The resistivity of aluminum is approximately [tex]2.65 \times 10^{-8}[/tex] ohm-meters (Ωm).

First, we need to convert the dimensions of the cross-sectional area from centimeters to meters:

1.18 cm = 0.0118 m

5.23 cm = 0.0523 m

Then, we can calculate the cross-sectional area of the bar:

[tex]A = (0.0118\ m) \times (0.0523\ m) = 6.16654 \times 10^{-4} \ m^2[/tex]

Now we can substitute the values into the formula for resistance:

[tex]R = (2.65 \times 10^{-8} \Omega m \times 3.78 m) / (6.16654 \times 10^{-4} \ m^2)[/tex]

[tex]R = 1.62 \times 10^{-4}[/tex]

Hence the resistance is [tex]1.62 \times 10^{-4} \ \Omega m[/tex].

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The conservation of angular momentum explains that a planet moves faster at perihelion due to an increase in angular velocity, resulting in an increase in linear velocity.

The conservation of angular momentum can be found as:

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In a radio telescope, the role that the mirror plays in visible-light telescopes is played by a large metal dish (antenna).

A radio telescope works by collecting and analyzing radio waves emitted by celestial objects. To collect these radio waves, the radio telescope has a large metal dish, also known as an antenna.

This metal dish gathers radio waves from space and reflects them into the radio telescope's receiver.Spectrometer is a scientific instrument used to measure the intensity of different wavelengths of light in a spectrum.

It is an essential tool for astronomers as it helps to understand the nature of celestial objects by analyzing the light that they emit.Interferometer is a device used in radio telescopes to improve the resolution of images.

It is used to combine the signals from multiple telescopes, allowing astronomers to study more distant objects with greater accuracy.

Special lenses are used in visible-light telescopes to focus light onto the detector or camera. They help to produce clear images by reducing distortions caused by aberrations and other optical imperfections.

Computer software is used in all types of telescopes to process and analyze the data collected by the telescope.

It allows astronomers to create images, measure the intensity of different wavelengths of light, and make other calculations.

The role that the mirror plays in visible-light telescopes is replaced by a large metal dish in radio telescopes, which collects and reflects radio waves into the telescope's receiver.

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If the coefficient of kinetic friction between the road and car tires is 0.694, the car will travel approximately 57.4 meters before it comes to a complete stop.

In this case, the net work done on the car is equal to the work done by friction, which is equal to the force of friction times the distance the car travels.

Therefore:

W_net = W_friction = f_friction x d

where f_friction is the force of friction and d is the distance the car travels.

The force of friction is given by:

f_friction = μ_k x N

where μ_k is the coefficient of kinetic friction and N is the normal force.

Since the car is on a flat road, the normal force is equal to the weight of the car, which is given by:

N = m x g

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

Substituting the given values, we get:

N = m x g = 1000 kg x 9.81 m/s² = 9810 N

f_friction = μ_k x N = 0.694 x 9810 N ≈ 6808.14 N

Now we can use the work-energy theorem to find the distance the car travels:

W_net = ΔK = 0 - 1/2 x m x v²

where ΔK is the change in kinetic energy, which is equal to the initial kinetic energy of the car (1/2 x m x v²) since the car comes to a complete stop.

Substituting the values, we get:

W_net = f_friction x d = -1/2 x m x v²

6808.14 N x d = -1/2 x 1000 kg x (19.6 m/s)²

d = -1/2 x 1000 kg x (19.6 m/s)² / 6808.14 N

d ≈ 57.4 m

Therefore, the car distance before it stops = 57.4 meters.

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The two stars separated by one degree on the celestial sphere imply that they are relatively close together.

This can be determined by the degree measurement, as one degree of arc is roughly equivalent to one-sixtieth of a degree of the Earth's circumference.

This implies that the two stars are relatively close together in terms of the celestial sphere, meaning they may even be located within the same constellation.

In addition to their proximity, the degree of separation between the two stars may also indicate that they are physically close together.

The further apart two stars appear in the night sky, the further away they actually are from one another. Therefore, a one-degree separation implies that the stars are quite close together in space.

The relative closeness of the stars may also have implications for their age and luminosity.

Stars that are relatively close together in space will have been formed from the same nebula, meaning they will likely be of the same age and share similar luminosities.

The degree of separation between the two stars may even provide an indication of how they were formed, potentially indicating that they were formed in the same event or were ejected from the same star system.

Two stars separated by one degree on the celestial sphere are likely to be quite close together in terms of the night sky, physical proximity, and age/luminosity.

Understanding the degree of separation between the two stars can provide valuable information regarding the formation and proximity of these two stars.

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Answer:

The electric power didn’t last very long. It lasted only as long as the chemical reaction in the battery.

Explanation:

Answer:

The energy stored in the field decreases because the magnet moves in the direction of the field.

Explanation:

Yes, a charge can move on a curved (non-linear) path if it is placed in the middle of the plates.

This is because the electric field is non-uniform in this region, and the force acting on the charge will be non-uniform. As a result, the charge will experience a net force that is not in the same direction as the electric field, and its path will be curved.

The direction of the force acting on the charge is determined by the direction of the electric field at the location of the charge, and the sign of the charge itself.

If the charge is positive, it will experience a force in the direction of the electric field. If it is negative, it will experience a force in the opposite direction to the electric field.

In order to determine the exact path that the charge will follow, you need to know the magnitude and direction of the electric field at each point in space.

This can be calculated using the principles of electrostatics, which relate the electric field to the charge density and the geometry of the system.

Once you know the electric field, you can use Newton's laws of motion to determine the path of the charge, taking into account any other forces that may be acting on it.

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The camera should be now focused at a distance of 16 meters.

The camera, in this case, should focus on the distance from the mirror to the object reflected by the mirror. The distance should be twice the distance of the object to the mirror.

The mirror image and the object should be equidistant from the mirror. This implies that the distance of the object from the mirror is equal to the distance of the mirror image from the mirror.

The distance that the camera should focus on is equal to the distance from the object to the mirror, multiplied by 2. Therefore, Distance from the object to the mirror = 8 meters

Distance from the camera to the object = distance from the mirror to the object, which is twice the distance from the mirror to the object

Distance from the camera to the object = 2 × 8 meters = 16 meters

Therefore, the camera should be focused at a distance of 16 meters.

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