if two people talk simultaneously and each creates an intensity level of 65 db at a certain point, does the total intensity level at this point equal 130 db?

The angular acceleration is a measure of how quickly the rotational speed of the body is changing.

The expression [tex]\alpha (t) = 7 + 5t + 8t^2[/tex] represents the angular acceleration of a rotating body as a function of time t.

The constant term of 7 represents the initial angular acceleration of the body, measured in radians per second squared ([tex]rad/s^2[/tex]). The coefficient of t, 5, represents the rate at which the angular acceleration is increasing with time, measured in radians per second cubed ([tex]rad/s^3[/tex]). The coefficient of [tex]t^2[/tex], 8, represents the rate at which the rate of increase in angular acceleration is changing with time, measured in radians per second to the fourth power ([tex]rad/s^4[/tex]).

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The total resistance of a circuit where a fan of 2 ohms and 4 lights 1 ohm each are all connected in parallel is 2/9 ohms.

1: Find the reciprocal of the resistance of each component.
Reciprocal of the fan's resistance: 1/2 ohms
Reciprocal of each light's resistance: 1/1 ohms (for each light)

2: Add the reciprocals of all the resistances together.
Total reciprocal of resistances = (1/2) + (1/1) + (1/1) + (1/1) + (1/1)

3: Simplify the equation.
Total reciprocal of resistances = (1/2) + 4(1/1) = (1/2) + 4 = 9/2

4: Find the reciprocal of the total reciprocal of resistances to find the total resistance.
Total resistance = 1/(9/2) = 2/9 ohms

So, the total resistance of the circuit with a 2-ohm fan and four 1-ohm lights connected in parallel is 2/9 ohms.

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The force you exert on the child while carrying them on your back down a hill is in the forward direction (horizontal), counteracting the force of gravity pulling the child downwards.

The force that you are exerting on the child while carrying them on your back as you walk down a hill is in the forward direction (horizontal). This force is necessary to maintain the child's steady speed and to counteract the force of gravity that is pulling the child downwards. The force you are exerting is not in the direction of your velocity, which is downhill, but in the opposite direction, which is forward.
The force that you are exerting on the child is an example of an external force, which is any force that is applied to an object from outside of the object. In this case, the external force is coming from you as you carry the child on your back.
It's important to note that the force you exert on the child is not a result of the child's weight. The child's weight is a gravitational force that is always directed downwards. The force you exert is necessary to counteract the weight of the child and ensure that they maintain a steady speed while you walk down the hill.
In summary, the force you exert on the child while carrying them on your back down a hill is in the forward direction (horizontal), counteracting the force of gravity pulling the child downwards.

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A cylindrical metal rod has a resistance R. If both its length and its diameter are doubled, its new resistance will be R/2

The resistance (R) of a cylindrical metal rod can be calculated using the formula:

R = ρ ×(L / A),

where ρ is the resistivity of the material, L is the length of the rod, and A is the cross-sectional area of the rod.

When the length (L) and diameter (D) of the rod are doubled, we have:

New Length (L') = 2L
New Diameter (D') = 2D

The cross-sectional area (A) of a cylinder can be calculated as:

A = π ×(D/2)²

So, when the diameter is doubled:

New Area (A') = π  ×(D'/2)² = π × (2D/2)² = π  (×D²)

Now, we can calculate the new resistance (R'):

R' = ρ  ×(L' / A') = ρ  ×(2L / (π Dײ))

Since the original resistance R = ρ × (L / (π × (D/2²)), we can relate R and R':

R' = (2L / (π× D²))  ×(ρ  ×(π ×(D/2)²)) / L = (2/4) × R = R/2

Therefore, the new resistance will be R/2, which corresponds to option A.

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The work done by a force in moving an electron through a positive potential difference of 2.0 x 10^6V can be calculated using the formula W = q x V, where W is the work done, q is the charge of the electron (which is 1.6 x 10^-19 C), and V is the potential difference. Plugging in the values, we get:W = (1.6 x 10^-19 C) x (2.0 x 10^6V)
W = 3.2 x 10^-13 J

Therefore, the amount of work that would have to be done by a force in moving an electron through a positive potential difference of 2.0 x 10^6V is 3.2 x 10^-13 J.
To calculate the work done in moving an electron through a positive potential difference, you can use the following equation:Work (W) = Charge (q) × Potential Difference (V)
The charge of an electron (q) is approximately -1.6 × 10^-19 Coulombs, and the potential difference (V) given in the problem is 2.0 × 10^6 V.
W = (-1.6 × 10^-19 C) × (2.0 × 10^6 V)
W = -3.2 × 10^-13 Joules
The negative sign indicates that the work done is against the direction of the electric field. Therefore, the work required to move an electron through a positive potential difference of 2.0 × 10^6 V is 3.2 × 10^-13 Joules.

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This will help to maximize the power output of the cell while minimizing the internal power loss.

The power dissipated within a cell of multiple loops is equal to the product of the current flowing through the cell and the total internal resistance of the cell.

When a cell is in use, a portion of the electrical energy is dissipated within the cell as heat due to the internal resistance of the cell. This is known as the power dissipated or the internal power loss of the cell.

For a multi-loop cell, the internal resistance is the sum of the internal resistances of each cell in the series. Therefore, the power dissipated within the cell can be calculated using the formula:

Pdiss = I^2 * Rint

where Pdiss is the power dissipated in watts (W), I is the current flowing through the cell in amperes (A), and Rint is the total internal resistance of the cell in ohms (Ω).

The power dissipated within the cell is proportional to the square of the current flowing through the cell. Therefore, as the current increases, the power dissipated within the cell also increases. This can lead to a decrease in the efficiency of the cell and a reduction in its overall performance.

To reduce the power dissipated within the cell, it is important to minimize the internal resistance of each cell in the series and use an external load that matches the total resistance of the circuit. This will help to maximize the power output of the cell while minimizing he internal power loss.

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A mass of approximately 0.710 kg must be added to the 0.500-kg object to change the period of oscillation from 1.28 s to 2.21 s.

The period of an oscillating spring-mass system can be determined using the equation:

T = 2π √(m/k)

where T is the period of oscillation, m is the mass of the object attached to the spring, and k is the spring constant.

In this case, we are given that a 0.500-kg mass suspended from a spring oscillates with a period of 1.28 s. We can use this information to determine the spring constant of the system:

1.28 s = 2π √(0.500 kg/k)

k = (2π/1.28 s)^2 (0.500 kg)

k = 30.99 N/m

To find how much mass must be added to the object to change the period to 2.21 s, we can use the same equation with the new period and solve for the mass:

2.21 s = 2π √((0.500 + m)/30.99 N/m)

(0.500 + m)/30.99 N/m = (2.21 s/(2π))^2

0.500 + m = 30.99 N/m (2.21 s/(2π))^2

m = 30.99 N/m (2.21 s/(2π))^2 - 0.500 kg

m = 0.710 kg

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According to Bohr's model, an electron emits electromagnetic radiation when it is changing from an orbit of higher energy to a lower one.

An electron emits electromagnetic radiation when it is changing from an orbit of higher energy to a lower one. This is because when an electron moves from a higher energy level to a lower one, it releases energy in the form of electromagnetic radiation. Conversely, when an electron moves from a lower energy level to a higher one, it absorbs energy and does not emit radiation.when an electron gains energy, it moves away from nucleus (from low energy state to a higher energy state) . When an electron falls from higher energy state to lower energy state, it emits energy in form of radiations.

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To find the speed of the cylinder, we can use the conservation of energy principle. The initial potential energy of the cylinder at the top of the ramp is converted to kinetic energy at the bottom of the ramp.

The potential energy of the cylinder is given by mgh, where m is the mass of the cylinder, g is the acceleration due to gravity, and h is the height of the ramp. The height of the ramp is given by h = 5.00m sin(21.0°) = 1.802m.

The kinetic energy of the cylinder is given by ½mv^2, where v is the speed of the cylinder.

Equating the initial potential energy to the final kinetic energy, we have:
mgh = ½mv^2

Substituting the mass of the cylinder and the height of the ramp, we have:
(0.5)(9.81 m/s^2)(0.350m)sin(21.0°) = ½(0.5kg)v^2

Simplifying, we get:

v = √[2(9.81 m/s^2)(0.350m)sin(21.0°)]
v = 2.80 m/s

Therefore, the speed of the cylinder after rolling a distance of 5.00m down the ramp is 2.80 m/s.

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The net force acting upon the rocket is 371.6 N.

The net force acting upon the rocket is the difference between the thrust force and the force of gravity acting on the rocket.

The force of gravity on the rocket can be calculated using the formula

Fg = mg,

where m is the mass of the rocket (40.0 kg) and g is the acceleration due to gravity (9.81 m/s^2). Therefore, Fg = 392.4 N.

The net force acting upon the rocket is then calculated as follows:

Net force = Thrust force - Force of gravity
Net force = 764 N - 392.4 N
Net force = 371.6 N

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The ratio of the electric field strength at point A to the electric field strength at point B is 4 to 1. The correct option is B.

We know that the electric field strength (E) at a distance (r) from a point charge Q is given by the equation:

E = kQ/r^2,

where k is the Coulomb constant (k = 9 x 10^9 Nm^2/C^2).

Now, let's consider point A and point B in the diagram provided. Let the distance between Q and point A be r1, and the distance between Q and point B be r2 = 2r1.

So, the electric field strength at point A is given by:

EA = kQ/r1^2

The electric field strength at point B is given by:

EB = kQ/r2^2 = kQ/(2r1)^2 = kQ/4r1^2

Now, we can calculate the ratio of EA to EB:

EA/EB = (kQ/r1^2)/(kQ/4r1^2) = 4

Other options are:

Option (A) 8 to 1 is not true because the ratio of electric field strength does not depend on the distance between the charges raised to the power of any integer.

Option (C) 2 to 1 and option (E) 1 to 2 are not true because they do not correspond to the calculated ratio of electric field strength.

Option (D) 1 to 1 is not true because the electric field strength is inversely proportional to the square of the distance, and the distance between Q and points A and B is not the same.

Therefore, the ratio of the electric field strength at point A to the electric field strength at point B is 4 to 1, which is option (B).

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The IMA of a wheel and axle could be increased by increasing the size of the wheel and/or the decreasing size of the axle.

The IMA of a wheel and axle is  ratio of radius of wheel to radius of axle. To increase IMA of wheel and axle, you can increase the size of the wheel, which will increase the radius of the wheel and therefore increase IMA. For example, if you have a wheel with a radius of 10cm and an axle with a radius of 2cm, IMA of the wheel and axle is 5cm . If you increase radius of wheel to 20cm, IMA becomes 10cm. If you decrease  radius of axle to 1 cm, IMA becomes 20cm .

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The work that must be supplied to the refrigerator for it to reject 1000 kj of heat to the room it is placed is 625 kj.

A refrigerator works by absorbing heat from inside and rejecting it to the outside environment. The coefficient of performance (COP) is a measure of its efficiency and is defined as the ratio of the heat removed from the refrigerator to the work supplied to it. In this case, the COP of the refrigerator is given as 1.6.

To find out how much work must be supplied to the refrigerator for it to reject 1000 kj of heat to the room, we can use the equation:

COP = Qc / W

where Qc is the heat rejected to the room and W is the work supplied to the refrigerator.

Rearranging the equation, we get:

W = Qc / COP

Substituting the given values, we get:

W = 1000 kj / 1.6

W = 625 kj

Therefore, the work that must be supplied to the refrigerator for it to reject 1000 kj of heat to the room it is placed is 625 kj. This means that the refrigerator is capable of transferring 1000 kj of heat from inside to outside by consuming 625 kj of work, making it an efficient cooling system.

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The work done by the given force during this displacement is -45 J.

Force acting on the particle, F = -15j N

The displacement of the particle, s = 3i + 3j - 1k

Therefore, the work done by the force is the dot product of the force and displacement.

W = F.s

W = (-15j).(3i + 3j - 1k)

W = -15j.3j

W = -45 J

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When the tension in the string is doubled without changing its mass density, the new fundamental frequency would become approximately 52.3 Hz.

To find the new fundamental frequency of the stretched string when the tension is doubled, we need to use the formula for the fundamental frequency of a string, which is:
f = (1/2L) * √(T/μ)

where f is the fundamental frequency, L is the length of the string, T is the tension, and μ is the mass density.

Since the fundamental frequency occurs when the string is driven at 37 Hz and the tension is doubled, we can set up the following equation:
f_new = (1/2L) * √(2T/μ)

We know the original fundamental frequency (37 Hz) is:
37 Hz = (1/2L) * √(T/μ)

Now, we need to find the ratio of the new frequency (f_new) to the original frequency (37 Hz):
f_new/37 Hz = √(2T/μ) / √(T/μ)
f_new/37 Hz = √(2)

To find the new fundamental frequency, simply multiply the original frequency by the ratio:
f_new = 37 Hz * √(2)
f_new ≈ 52.3 Hz

So, the new fundamental frequency would be about 52.3 Hz when the tension in the string is doubled without changing its mass density.

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In a greenhouse, electromagnetic energy in the form of visible light enters the glass panes and is absorbed and then reradiated electromagnetic radiation from within the greenhouse is the correct option is a.) It's partially blocked by glass.

In a greenhouse, electromagnetic energy in the form of visible light enters through the glass panes and is absorbed by the plants and other objects inside. This energy is then reradiated as infrared radiation (heat), which is partially blocked by the glass, causing the greenhouse to retain heat and maintain a warmer temperature inside.

The plants and other items inside a greenhouse absorb electromagnetic energy in the form of visible light as it enters through the glass panels. The greenhouse retains heat and keeps its interior at a warmer temperature as a result of this energy being reradiated as infrared radiation (heat), which is then partially blocked by the glass.

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The direction of the magnetic force on the electron is given by the right-hand rule.

If you point your right thumb in the direction of the velocity of the electron (+x direction) and your fingers in the direction of the magnetic field (+y direction), then the direction in which your palm faces gives the direction of the force on the electron. In this case, the force is perpendicular to both the velocity of the electron and the magnetic field, and is in the -z direction (into the page).

Therefore, the magnetic force on the electron is in the negative z-direction.

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For an isothermal process, where the temperature remains constant, the relationship between the initial pressure and volume (Pi,Vi) and the final pressure and volume (Pf,Vf) can be described by the Boyle's Law equation. This equation states that the product of pressure and volume is constant for a fixed amount of gas at a constant temperature. Mathematically, it can be expressed as Pi x Vi = Pf x Vf. This means that as the initial pressure decreases, the volume of the gas increases and vice versa. Similarly, if the final pressure increases, the volume decreases and vice versa, as long as the temperature remains constant.

The equation Pi x Vi = Pf x Vf is known as Boyle's Law equation, and it can be used to calculate the pressure or volume of a gas at one state if the pressure and volume at another state are known. For example, if the initial pressure and volume of a gas are Pi and Vi, and the final pressure is Pf, we can calculate the final volume using the equation Vf = (Pi x Vi) / Pf.

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It helps to prevent you from being thrown around in the car during sudden stops or turns, reducing the risk of injury.

As a passenger in a car not wearing a seat belt, during a sharp left turn, you will feel like you are being thrown to the right side of the car due to the inertia of your body. This is because of Newton's First Law of Motion, which states that an object in motion will remain in motion in a straight line at a constant speed unless acted upon by an external force. In the absence of an external force, your body has a natural tendency to continue moving in the same direction and at the same speed as the car before the turn. However, the car's seat, floor, and door exert a force on your body, pushing you towards the left side of the car, which makes you feel as though you are being thrown to the right side of the car. This is why wearing a seat belt is important, as it helps to prevent you from being thrown around in the car during sudden stops or turns, reducing the risk of injury.

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When you are dragging a heavy chair across the floor, you are applying a force on the chair in the direction of the pull. The chair is moving towards the east at a constant velocity, which means that there is no acceleration acting on the chair. The net force on the chair points towards the east because that is the direction in which you are pulling the chair.

If the net force on the chair was pointing upward and eastward at an angle between the two individual directions, it would mean that there is an additional force acting on the chair, causing it to move in a different direction.

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The wind is exerting a force of 0.125 N on the paper cup.

The force exerted by the wind on the cup can be calculated using Newton's second law of motion, which states that the force acting on an object is equal to its mass times its acceleration:

F = m * a

where F is the force in newtons (N), m is the mass in kilograms (kg), and a is the acceleration in meters per second squared (m/s^2).

Substituting given values, we get:

F = 0.025 kg * 5 m/s^2

F = 0.125 N

Substituting the given values, we get:

F = 0.025 kg * 5 m/s^2

F = 0.125 N

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The speed of the wave pulse in the second rope does not change compared to the first rope.

The wave speed in the second rope made of the same material but twice as thick and held at the same tension as the first rope will be the same as that of the first rope.

This is because the wave speed in a rope depends on the tension and the linear mass density of the rope. The linear mass density is directly proportional to the thickness of the rope. Since the second rope is twice as thick as the first, its linear mass density will also be twice that of the first rope.

However, since both ropes are made of the same material and held at the same tension, the wave speed will be the same for both ropes. Therefore, the speed of the wave pulse in the second rope does not change compared to the first rope.

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Compared to the primary voltage, the secondary voltage may be larger, smaller, or the same, depending on the transformer's design and purpose.

Your question is about the relationship between the primary and secondary voltage in a transformer. Compared to the primary voltage, the secondary voltage may be larger, smaller, or the same, depending on the transformer's design and purpose.

A step-up transformer increases the voltage, making the secondary voltage larger than the primary voltage.

In contrast, a step-down transformer reduces the voltage, resulting in a smaller secondary voltage. Finally, an isolation transformer has the same primary and secondary voltage.

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In the Compton effect, a photon of wavelength λ and frequency f hits an electron that is initially at rest. As a result of the collision, the correct option is c. Photon loses energy, so the final photon has a wavelength greater than λ.

When the photon collides with the electron, some of its energy is transferred to the electron, causing the electron to be scattered. Consequently, the photon loses energy, and according to the relationship between energy, frequency, and wavelength (E = hf and c = λf, where h is Planck's constant and c is the speed of light), a decrease in energy corresponds to a decrease in frequency and an increase in wavelength. Therefore, the final photon has a wavelength greater than λ.

So, the correct option is C.

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The spring constant is k = 2.0 N / 0.30 m = 6.67 N/m.The spring constant is a measure of the stiffness of a spring, and it is defined as the force required to stretch or compress a spring by one unit of length. In this case, the spring is pulled back 0.30 m, and it applies a force of 2.0 N to the 0.50 kg mass attached to it.

Using Hooke's law, which states that the force applied to a spring is directly proportional to the displacement of the spring, we can calculate the spring constant using the formula k = F/x, where F is the force applied, and x is the displacement.

This means that for every unit of displacement, the spring will exert a force of 6.67 N. The higher the spring constant, the stiffer the spring, and the more force it will require to compress or stretch it.

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In this model, the reaction favours the reactants and the equilibrium is to the left.

It is argued that an equilibrium is stable when tiny, environmentally induced displacements from it result in forces that have a tendency to oppose the displacement and bring the body or particle back to the equilibrium state. A brick placed flat on the ground or a weight held by a spring are two examples.

When a reaction is said to have "reached equilibrium," it suggests the rate of forward reaction and the rate of reversal are now equal. Due to the rate of forward reactions being equal to the reaction's opposite rate, the quantity or concentrations of both reactants and outcomes remain unchanged.

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The number of scans required to increase the signal-to-noise ratio by a factor of at least 7 in FTIR spectroscopy depends on various factors such as the sample, instrument, and experimental conditions.

However, as a general rule of thumb, it is recommended to perform at least 64 scans for high-quality spectra with a good signal-to-noise ratio.

Increasing the number of scans further will improve the signal-to-noise ratio, but at the cost of increased acquisition time.

Therefore, it is important to balance the number of scans with the time constraints of the experiment.

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It is so much easier to perform interference experiments with a laser than with an ordinary light source including coherence, monochromaticity, and intensity.

First, lasers produce highly coherent light, meaning the light waves maintain a consistent phase relationship over time and distance. This coherence is essential for observing clear and stable interference patterns, as it ensures that the interacting light waves have a fixed phase difference. In contrast, ordinary light sources emit incoherent light with random phase differences, making interference patterns difficult to detect.

Second, lasers are monochromatic, which means they emit light at a single wavelength or a very narrow range of wavelengths. Monochromaticity simplifies interference experiments by avoiding the need to filter out unwanted wavelengths, as would be necessary with ordinary light sources that emit a broad spectrum of colors. This characteristic also reduces the chances of chromatic dispersion, which can distort interference patterns.

Lastly, lasers have a high intensity, allowing for the production of bright and easily observable interference patterns. The focused nature of laser light ensures that it maintains its intensity over greater distances compared to ordinary light sources, which generally emit light in all directions and lose intensity more rapidly. In summary, lasers are advantageous for interference experiments due to their coherence, monochromaticity, and intensity, which together facilitate the production of clear, stable, and easily observable interference patterns.

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The value of L that would result in 90% of the maximum current in the circuit when initially connected to a resistor and a voltage source is 0.9 times the square of the resistance in the circuit.

What is RL circuit?

An RL circuit is an electrical circuit that consists of a resistor and an inductor connected in series. The letter "R" stands for resistor, and the letter "L" stands for inductor. Inductors are passive electrical components that store energy in a magnetic field when an electric current flows through them, while resistors are electrical components that resist the flow of electrical current.

To determine the value of l in an RL circuit that would result in 90% of its maximum current when initially connected to a resistor and a voltage source, we need to use the time constant of the circuit.

The time constant (τ) of an RL circuit is given by the formula:

τ = L/R

where L is the inductance of the circuit in henries, and R is the resistance of the circuit in ohms.

The time constant represents the time it takes for the current in the circuit to reach approximately 63.2% of its maximum value.

We can use this formula to find the value of L that would result in 90% of the maximum current in the circuit:

τ = L/R

Solving for L, we get:

L = τ x R

We know that at time constant τ, the current in the circuit is approximately 63.2% of its maximum value. Therefore, we can write:

0.632 x Imax = V/R

where Imax is the maximum current in the circuit and V is the voltage across the circuit.

Solving for Imax, we get:

Imax = V/R x 1/0.632

Imax = 1.58 x V/R

Now, we can substitute this expression for Imax into the formula for the time constant:

τ = L/R = L/(1.58 x V/R)

Simplifying, we get:

L = τ x 1.58 x V

We want the current to be 90% of its maximum value when initially connected to the circuit. This means that we want the current to reach this value within one time constant (i.e., when t = τ). Therefore, we can set τ equal to the time it takes for the current to reach 90% of its maximum value:

τ = 0.9 x Imax x R / V

Substituting this expression for τ into the formula for L, we get:

L = 0.9 x R x V x 1.58 / Imax

Substituting the expression we derived earlier for Imax, we get:

L = 0.9 x R x V x 1.58 / (1.58 x V/R)

Simplifying, we get:

L = 0.9 x R^2

Therefore, the value of L that would result in 90% of the maximum current in the circuit when initially connected to a resistor and a voltage source is 0.9 times the square of the resistance in the circuit.

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