a 180-m-wide river flows due east at a uniform speed of 1.9 m/s. a boat with speed of 8.2 m/s relative to the water leaves the south bank of the river pointed in a direction 35 degrees west of north. what is the magnitude of the boat's velocity relative to the ground (in m/s)?

We can 9 bulbs of 23 W is parallel across a potential difference of 75 v before the total current in the circuit exceeds 2.9 Ampere.

The current generated by single bulb will be calculated by the formula -

Current = power/potential difference

Keep the values

Current = 23/75

Current = 0.3 Amperes.

Now, the number of bulbs will be calculated as -

Number of bulbs = total current/current per bulb

Number of bulbs = 2.9/0.3

Performing division

Number of bulbs = 9.6

The number of bulbs can not be fraction, hence, required number is 9.

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Wave packet: particle momentum. Group velocity and phase velocity. Phase velocity > c possible. Relativity allows apparent faster-than-light motion.

In wave-molecule duality, a molecule can be depicted by a wave parcel, which is a blend of many rushes of various frequencies and amplitudes that movement together in space. The gathering speed, which decides how the pinnacle of the wave parcel travels through space, is given by the subsidiary of the wave bundle's scattering connection as for energy. The stage speed, which decides how the period of the singular waves inside the bundle travels through space, is given by the proportion of the wave's recurrence to its wave number.

The stage speed can be more prominent than the speed of light, yet this doesn't abuse the laws of relativity since it doesn't convey data quicker than light. All things being equal, it mirrors the way that the wave parcel is comprised of various frequencies that movement at various paces.

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If a line drive is hit essentially horizontally at this speed and is caught by a 71.0 kg player who has leapt directly upward into the air, The momentum before and after the collision (catch) should be equal.

Step 1: Calculate the initial momentum of the baseball
Initial momentum of the baseball = mass_baseball × velocity_baseball
Step 2: Calculate the initial momentum of the player
The initial momentum of the player = 0 (since the player is leaping directly upward, his horizontal momentum is 0)
Step 3: Calculate the total initial momentum
Total initial momentum = initial momentum of the baseball + initial momentum of the player
Step 4: Calculate the final momentum
Since the player catches the baseball, their momenta combine.
Final momentum = (mass_baseball + mass_player) × final_velocity_player
Step 5: Apply the conservation of momentum principle
Total initial momentum = Final momentum
Step 6: Solve for the final_velocity_player
final_velocity_player = Total initial momentum / (mass_baseball + mass_player)
Step 7: Convert the final_velocity_player to cm/s (1 m/s = 100 cm/s)

By following these steps with the given data (mass_baseball, velocity_baseball, and mass_player), you can calculate the horizontal speed of the player in cm/s after catching the ball.

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Answer:

S = 2 π R = 2 π * 6.0E6 m = 3.8E7m       distance traveled

t = S / v = 3.8E7 / 3.0E8 = .013 sec

1/8 sec is closest

An object traveling at the speed of light will take 0.125 s to circle the earth.The correct option is therefore 1/8 of a second (0.125 s).

Recall that the circumference of a circle is given as 2πr, where r is the radius. Therefore, the circumference of the Earth is given as:

C = 2πr = 2 x 3.14 x 6000 kmC = 37680 km

Therefore, the time it takes for an object traveling at the speed of light (300,000 km/s) to circle the Earth is given by:

T = Distance / SpeedT = 37680 km / 300000 km/sT = 0.1256 s

Therefore, it will take an object traveling at the speed of light about 1/8 of a second (0.125 s) to circle the Earth. Therefore, the correct option is 1/8 of a second (0.125 s).

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The magnitude of the force a unit length of one wire on the other is 2.0 × 10⁻⁵ N/m.

The direction of the force can be found using the right-hand rule: if you point your right thumb in the direction of the current in one wire, and your fingers in the direction of the current in the other wire, the direction of the force is perpendicular to both, pointing towards the other wire.

Thus, the force a unit length is given by:

F =[tex]\mu_o * I_1 * I_2 * L / (2 * \pi * d)[/tex]

= (4π × 10⁻⁷ N/A²) * (2.0 A) * (5.0 A) * (1 m) / (2 * π * 0.05 m)

= 2.0 × 10⁻⁵ N/m

Newton's laws of motion, which indicate that unless acted upon by a net external force, an object will stay at rest or in uniform motion along a straight line, describe force. According to the second rule of motion, an object's acceleration is inversely proportional to its mass and directly proportional to the net force exerted on it. This law is expressed mathematically as F = ma, where F is the net force, m is the mass of the object, and a is its acceleration.

Forces can be contact forces, such as friction and tension, or non-contact forces, such as gravity and electromagnetic forces. Understanding forces is important in many fields, including physics, engineering, and mechanics, and is necessary for designing structures, machines, and vehicles that can withstand and utilize them.

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Answer:

D

Explanation:

This is a Doppler effect question.  The answer is D because observer A hears a lower pitch than observer B, who hears a higher pitch.  Look at how much closer together the sound waves are on the right vs. the left.  The closer together the waves, the higher the frequency and the higher the pitch.

The magnitude of the change in momentum of the rocket during this blast is 29250 N-s. A rocket ship at rest in space gives a short blast of its engine, firing 65 kg of exhaust gas out the back end with an average velocity of 450 m/s.

During a short blast of its engine, the rocket ship fires 65 kg of exhaust gas out of the back end at an average velocity of 450 m/s. The change in momentum of the rocket during the blast can be calculated using the law of conservation of momentum, which states that the total momentum of an isolated system remains constant if no external forces act upon it.

A rocket's initial momentum is zero since it is at rest. Therefore, the change in momentum of the rocket is equal to the momentum of the exhaust gas exiting the back end of the rocket.

The magnitude of the change in momentum of the rocket during this blast can be calculated as follows: Change in momentum of the rocket = Momentum of exhaust gas= (mass of exhaust gas) x (velocity of exhaust gas)= 65 kg x 450 m/s= 29250 N-s.

Therefore, the magnitude of the change in momentum of the rocket during this blast is 29250 N-s.

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Answer:CFCs and halons cause chemical reactions that break down ozone molecules, reducing ozone's ultraviolet radiation-absorbing capacity

Explanation:

The students should look at the change in angular momentum on the y-axis of the graph and compare it to the angular impulse applied to the system, which should also be on the y-axis.

If the two values are equal, the angular momentum of the system is unchanged and the angular impulse applied to the system is equal to the change in angular momentum. If the two values are not equal, then the angular impulse applied to the system is not equal to the change in angular momentum.

The students should look at the x-axis of the graph and compare the time intervals of the angular impulse and the change in angular momentum to ensure they are the same. If the two time intervals are not equal, the angular impulse and the change in angular momentum are not equal and the angular impulse applied to the system is not equal to the change in angular momentum.

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In the described heat engine, the working fluid is steam. Steam is produced by heating water in the boiler using the heat generated by the nuclear reactor.

The high-pressure steam then turns the turbine, producing mechanical work, which is then converted into electrical energy. As the steam expands and loses its energy, it is condensed into water by rejecting heat to the atmosphere in the condenser.

This water is then pumped back into the boiler to be heated again and converted into steam, thus completing the cycle. Steam is an excellent working fluid for this type of heat engine because it has a high heat capacity, which means that it can store a lot of heat energy per unit mass.

Additionally, it undergoes a phase change when it is heated, which allows it to expand and produce mechanical work when it is under pressure. Finally, steam is readily available and relatively cheap to produce, making it an ideal choice for powering large-scale steam power plants.

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Complete question is:

A nuclear reactor is used to provide heat to a steam power plant. Within the heat engine, steam is generated in the boiler, the steam turns a turbine to produce power, and the steam is condensed by rejecting heat to the atmosphere before being pumped to the boiler again. Which substance is considered the working fluid in this heat engine? The water going through the boiler, turbine, and condenser

The current direction must come from the left side and out of its right side.

So option B is right choice.

The right-hand rule is a method that is frequently used in physics to determine the direction of the magnetic field produced by a current-carrying wire.

The direction of the magnetic field generated by the current is determined by the direction of the current. It can be determined by using a simple technique called the "Right-Hand Rule."

Position your right hand such that your thumb points in the direction of the current flow in the coil. Wrap your fingers around the coil in the direction of the magnetic field generated by the current. Curl your fingers around the coil in the direction of the magnetic field produced by the current, with your thumb pointing in the direction of the current.

The current direction in the coil that current enters from left side and comes out from right side.

The current direction in the coil is opposite to the magnetic field, hence it should be flowing from left to right.

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Question:-

Now use a right hand rule to determine the direction of the current in the coil that would produce the poles. The current direction must be:

A. Into the ammeter on both sides.

B. Into the ammeter's left side and out of its right side.

C. Out of the ammeter on both sides.

D. Into right side and out of its left side.

The initial kinetic energy of the box is 9.375 J.

The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it. We must put in effort in order to apply a force.

The initial kinetic energy of the box can be calculated by using the formula:

KE = 1/2 mv²

where

KE represents the initial kinetic energy,

m represents the mass of the box, and

v represents the initial velocity of the box.

As per given information in question,

Initial velocity (v) of the box = 2.5 m/s

Mass of the box (m) = 3 kg

Initial kinetic energy (KE)

= 1/2 × 3 kg × (2.5 m/s)²

= 9.375 J

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The foci points are approximately 6.75 feet away from the end walls.

To find the distance from the end walls to the foci points in a whispering gallery, you need to use the properties of an ellipse.

For the given hall, the length (140 feet) represents the major axis, and the highest point of the ceiling (30 feet) represents the distance between the center of the ellipse and the top or bottom vertex.
First, find the semi-major axis (a) and the semi-minor axis (b). Since the length is the major axis, divide it by 2 to get the semi-major axis:
a = 140/2 = 70 feet
The highest point of the ceiling is the distance from the center of the ellipse to the top vertex, which is equal to the semi-minor axis:
b = 30 feet
Now, use the formula for the distance between the center of the ellipse and the foci points, which is given by the equation:
c = [tex]\sqrt{(a^2 - b^2)}[/tex]
Plug in the values of a and b:
c = [tex]\sqrt{(70^2 - 30^2)}[/tex]
c = [tex]\sqrt{(4900 - 900)}[/tex]
c = [tex]\sqrt{(4000)}[/tex]
c = 20√10 feet
So, the distance between the center of the ellipse and each focus point is 20√10 feet.

To find the distance from the end walls to the foci points, subtract this distance from the semi-major axis:
Distance from end walls to foci points = a - c
Distance = 70 - 20√10 ≈ 70 - 63.25 ≈ 6.75 feet
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Answer:

Explanation:

The spring constant k of the spring is 48.277 N/m.

Simple harmonic motion or SHM is the motion in which the motion is oscillatory which means that the motion is to and fro along a reference point ie, the mean position. The magnitude of the restoring force is proportional to the displacement of the body from mean position. To calculate the spring constant k, we use the formula of time period :- T=2π√(m/k). Putting the values as per the given data, we substitute T=0.55, m=0.37kg, the value of spring constant we get is k=48.277 N/m.

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The spring constant of the spring is 4.90 N/m.

To find the spring constant (k), we can use the formula for the period of simple harmonic motion: T = 2π√(m/k), where T is the period, m is the mass, and k is the spring constant. In this case, T = 0.55 s and m = 0.37 kg. Rearranging the formula to solve for k, we get k = (4π²m) / T².


1. Substitute the given values into the formula: k = (4π²(0.37 kg)) / (0.55 s)²

2. Calculate the square of the period: (0.55 s)² = 0.3025 s²

3. Multiply the mass by 4π²: 4π²(0.37 kg) = 5.8074 kg

4. Divide the result from step 3 by the result from step 2: 5.8074 kg / 0.3025 s² = 4.90 N/m

Hence, the spring constant of the spring is 4.90 N/m.

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The energy stored in the inductor is doubled when the current is doubled. The amount of energy stored in the inductor increases by a factor of 4. Here option A is the correct answer.

The amount of energy stored in an inductor is given by the formula: E = 0.5 × L × I^2, where L is the inductance and I is the current flowing through the inductor.

If the current through an inductor is doubled while the inductance remains constant, then the energy stored in the inductor will increase by a factor of 4. This can be seen by substituting 2I for I in the formula:

E' = 0.5 × L × (2I)^2

= 0.5 × L × 4I^2

= 2 × (0.5 × L × I^2)

= 2E

When the current through an inductor is doubled while the inductance remains constant, the amount of energy stored in the inductor increases by a factor of 4. This is because the energy stored in an inductor is directly proportional to the square of the current flowing through it, as expressed by the formula E = 0.5 × L × I^2, where E is the energy stored, L is the inductance, and I is the current.

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Complete question:

A steady current flows through an inductor. if the current is doubled while the inductance remains constant, the amount of energy stored in the inductor group of answer choices

A - increases by a factor of 4.

B - increases by a factor that depends on the geometry of the inductor.

C - increases by a factor of 2.

D - none of the above.

The natural frequency of a second-order system is a critical parameter that determines the system's oscillatory behavior. In the complex plane, the roots of the characteristic equation are represented as complex conjugate pairs (a ± jω_n), where 'a' is the real part and 'ω_n' is the imaginary part.

The natural frequency, denoted by 'ω_n,' is the distance from the origin to either root on the imaginary axis. In a second-order system, the natural frequency is a key parameter that characterizes the system's oscillatory response. It determines how fast the system oscillates and its ability to maintain its energy during oscillation.

Higher natural frequencies typically result in faster oscillations and a higher energy conservation rate. When analyzing a second-order system, it is essential to understand the relationship between the natural frequency, damping ratio, and system response.

The damping ratio, denoted by 'ζ,' is another critical parameter that influences the system's behavior. If the damping ratio is less than 1, the system exhibits underdamped oscillations, and the imaginary part of the roots determines the natural frequency. If the damping ratio is equal to 1, the system is critically damped, and if the damping ratio is greater than 1, the system is overdamped.

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While closer to the sun, Venus may appear to be closer to Jupiter because of where it is around the sun and the position of the camera. Orbital period, Transit method, Radial velocity method, Direct imaging and Astrometry.

In order to determine the positions of planets in a distant star system, you could use the following clues:
1. Orbital period: By observing the time it takes for a planet to complete one orbit around its star, you can estimate its distance from the star. Planets closer to the star have shorter orbital periods than those farther away.
2. Transit method: When a planet passes in front of its star, it causes a slight dip in the star's brightness. By measuring this change in brightness, you can estimate the size of the planet and its distance from the star.
3. Radial velocity method: As a planet orbits its star, it causes the star to wobble slightly due to the planet's gravitational pull. This wobble can be detected as a shift in the star's spectrum, allowing you to determine the planet's mass and distance from the star.
4. Direct imaging: If the planets are far enough away from their star and have sufficient contrast, they may be directly imaged using high-resolution telescopes. This would provide information about their positions relative to the star.
5. Astrometry: By precisely measuring a star's position in the sky over time, you can detect the slight wobble caused by the presence of planets. This method can help determine the positions and masses of the planets in the system.

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The truck will require a larger impulse to bring it to a halt compared to the bicycle. Impulse is defined as the change in momentum of an object, which is the product of its mass and velocity.

Since both the truck and bicycle have the same velocity, their momentum will be proportional to their mass. The truck has a much larger mass compared to the bicycle, which means that it will require a greater impulse to bring it to a halt. This is because the larger mass of the truck means it has a greater inertia and will resist changes in its motion, such as slowing down or coming to a stop.

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Now that s=u*t+at2 is being used, s =0*+302 equals 300 m. For instance, if the plane was travelling at 300 m/s2, its final velocity before it took off was 30 m/s2.

If there isn't a net force exerted on the item that would cause it to accelerate, there is constant velocity. Drag and thrust are the two primary forces affecting the forward motion of an aeroplane.

The lift and push produced by an aeroplane while it is travelling level and straight at a steady velocity balance its weight and drag, respectively. Yet, as the aircraft climbs and descends, speeds up or slows down, and turns, the balance of forces varies.

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The distance between the two lenses must be greater than or equal to the sum of the focal lengths of the lenses when a telescope is used to focus on an infinitely distant object .

When a telescope is used to focus on an infinitely distant object and generate an infinitely distant image, the distance between the two lenses is equal to the sum of their focal lengths.

What is a telescope?A telescope is a tool used to magnify and concentrate the image of a distant object. Refracting and reflecting telescopes are the two main types of telescopes.

For the most part, a telescope utilizes a lens to collect and focus light. The focal length of the objective lens determines the magnification of the telescope.When the light rays leave the eyepiece and appear to have originated from the distant object, the image is formed.

The distance between the objective lens and the eyepiece is the key distance in a telescope. The length of the telescope's tube is also important because it determines the separation between the lenses and the lens's focal lengths. .

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"Two conducting spheres have radii of r1 and r2, with r1 greater than r2. If they are far apart the capacitance is proportional to: 1/r1 - 1/r2

The capacitance of two conducting spheres with radii r1 and r2, where r1 is greater than r2, and they are far apart is proportional to the difference in inverse radii. This can be written as:

C = k (A / d)

where C is the capacitance, k is the proportionality constant, A is the surface area, and d is the distance between the two spheres.

The surface area of a sphere is proportional to r^2,

so:C ∝ A = k (r1^2 + r2^2)

The inverse of capacitance is proportional to the difference in inverse radii,

so:1/C ∝ 1/(r1 - r2)

1/C = k' (1/r1 - 1/r2)

where k' is another proportionality constant, which combines with k to give the final constant of proportionality.

Therefore, the capacitance of two conducting spheres with radii r1 and r2, where r1 is greater than r2, and they are far apart is proportional to: 1/r1 - 1/r2.

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Violet light of wavelength 407 nm ejects electrons with a maximum kinetic energy of 0.764 eV from a certain metal. the work function of this metal is approximately 4.1 eV.

We can use the following equation to relate the maximum kinetic energy of the ejected electrons to the work function of the metal and the energy of the incident photons:

Kinetic energy of expelled electrons = incident photon energy - metal work function

We are given the wavelength of the incident photons, which we can use to find their energy using the formula:

Energy of photon = hc/λ

where h = 6.626 x 10^-34 J s is Planck's constant, c = 3.00 x 10^8 m/s is the speed of light, and λ = 407 nm = 4.07 x 10^-9 m is the wavelength of the incident light.

Substituting the given values, we get:

Energy of photon = hc/λ

Energy of photon = (6.626 x 10^-34 J s) x (3.0 x 10^8 m/s) / (407 x 10^-9 m)

Energy of photon ≈ 4.86 eV

Now we can use the first equation to find the work function of the metal:

Work function of the metal = Energy of incident photons - Kinetic energy of ejected electrons

Work function of the metal = 4.86 eV - 0.764 eV ≈ 4.1 eV

Therefore, the work function of this metal is approximately 4.1 eV.

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Galaxy evolution is a very active area of research, and there are several current and future observatories that investigate galaxy evolution, such as the James Webb Space Telescope (JWST).

These telescopes are quite large, with the JWST being the largest telescope ever built. It has a primary mirror that is 6.5 meters in diameter and is composed of 18 hexagonal mirror segments. The JWST will observe the universe at infrared wavelengths, between 0.6 and 28 micrometers.

The JWST is set to launch in 2021, and it will be the most advanced space telescope ever built. Its large size and infrared capabilities make it ideally suited for studying galaxy evolution. By observing galaxies in the infrared, the JWST will be able to see through the dust that often obscures the visible light emitted by galaxies.

The James Webb Space Telescope is a large telescope that will observe the universe at infrared wavelengths, and it is ideally suited for studying galaxy evolution. Its large size and infrared capabilities will allow astronomers to study the early stages of galaxy formation and evolution, which is a key area of research in astronomy.

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The constant angular acceleration of the wheel is 43.9 rad/[tex]s^2[/tex].

We can use the formula for constant angular acceleration: ωf = ωi + αt

where:

ωi = initial angular velocity = 0 (as the wheel starts from rest)

ωf = final angular velocity = 95.0 rad/s

t = time interval = 6.00 s

α = constant angular acceleration (to be found)

We can also use the formula for the number of revolutions (N) in terms of angular displacement (θ): N = θ / (2π)

where θ is the total angular displacement. Since the wheel completes 25 revolutions, its total angular displacement is: θ = 25 * 2π = 50π

Using the formula for angular displacement with constant angular acceleration: θ = ωit + 0.5α*[tex]t^2[/tex]

Substituting the given values and simplifying:

50π = 0 + 0.5α(6.00)

α = 50π / (0.5*(6.00)^2) = 43.9 rad/[tex]s^2[/tex]

Therefore, the constant angular acceleration of the wheel is 43.9..

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The specific gravity of ice is 0.917, whereas that of seawater is 1.025. Approximately 89.51% of an iceberg is above the surface of the water.

To find out what percent of an iceberg is above the surface of the water, we need to use Archimedes' principle, which states that the buoyant force on an object submerged in a fluid is equal to the weight of the fluid displaced by the object.

This means that an iceberg will float in water because it displaces an amount of water that weighs more than the iceberg itself.

The percentage of an iceberg above the surface of the water can be found using the following equation:

Percent above water = (Volume of iceberg above water / Total volume of iceberg) x 100

To find the volume of an iceberg above the water, we can use the following equation:

Volume of iceberg above water = Volume of iceberg x (Density of ice / Density of seawater)

So,Percent above water = [(Volume of iceberg x (Density of ice / Density of seawater)) / Total volume of iceberg] x 100

Percent above water = [(1 x (0.917 / 1.025)) / 1] x 100

Percent above water = 89.51%

Therefore, approximately 89.51% of an iceberg is above the surface of the water.

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The study of heat energy that is involved in chemical and physical changes is thermodynamics.

The correct option is "Thermodynamics."

Thermodynamics is the study of heat energy involved in chemical and physical changes. It is a branch of physics that deals with the relationship between heat and other forms of energy, as well as the laws governing energy conversion.

In simple terms, thermodynamics is the study of how energy is transformed from one form to another. It also examines the relationship between heat, work, and temperature, as well as the nature of energy and entropy. Thermodynamics is widely utilized in fields such as chemistry, physics, and engineering, among others.

Therefore, "Thermodynamics" is the correct answer.

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The RMS voltage required to supply an average power of 750 W to the coil is simply 1 volt.

To determine the root mean square (RMS) voltage of a source required to supply an average electrical power of 750 watts to a coil, we need to use the formula:

Average Power = RMS Voltage * RMS Current * Power Factor

Assuming that the power factor is 1 (i.e., the coil is purely resistive), the formula simplifies to:

Average Power = RMS Voltage * RMS Current

Since power is the product of voltage and current, we can write:

RMS Current = (Average Power / RMS Voltage)

Substituting the given values, we get:

RMS Current = (750 W / RMS Voltage)

To determine the RMS voltage required to supply the average power of 750 W, we need to solve for RMS voltage by rearranging the formula as follows:

RMS Voltage = (Average Power / RMS Current)

RMS Voltage = (750 W / RMS Current)

Substituting the expression for RMS current, we get:

RMS Voltage = [750 W / (750 W / RMS Voltage)]

RMS Voltage = RMS Voltage

Therefore, the RMS voltage required to supply an average power of 750 W to the coil is simply 1 volt.

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