A current of 4 A flows in a copper wire 10mm in diameter. The density of valence electrons in copper is roughly 9 × 10^28 m^−3 .Find the drift speed of these electrons. The fundamental charge is 1.602 × 10−19 C
Answers
The drift speed of valence electrons in a copper wire with a current of 4 A and a diameter of 10 mm is approximately 5.89 × 10⁻⁴ m/s.
The drift speed of electrons in a conducting wire can be calculated using the formula:
v_d = I / (n * A * e)
where:
v_d is the drift speed of electrons,
I is the current in the wire,
n is the number density of charge carriers (in this case, valence electrons) in the material,
A is the cross-sectional area of the wire, and
e is the charge of a single electron, equal to 1.602 × 10⁻¹⁹ C.
Given that the current I is 4 A, the diameter of the wire is 10 mm (or 10 × 10⁻³ m, which gives a radius of 5 × 10⁻³ m), and the number density of valence electrons in copper is 9 × 10²⁸ m⁻³, we can calculate the drift speed using the given formula. Note that the cross-sectional area A can be calculated using the formula A = π * r², where r is the radius of the wire.
Substituting the given values into the formula, we get:
v_d = 4 / (9 × 10²⁸ * π * (5 × 10⁻³)² * 1.602 × 10⁻¹⁹)
v_d ≈ 5.89 × 10⁻⁴ m/s
Therefore, the drift speed of valence electrons in the copper wire is approximately 5.89 × 10⁻⁴ m/s.
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Related Questions
Two people push on a shopping cart from opposite sides. In which situation
will the motion of the shopping cart stay the same?
A. The two people push with different amounts of force.
B. One of the people stops applying a force.
C. One of the people applies twice as much force.
D. The two people push with a balanced
face
Answers
Two people push on a shopping cart from opposite sides. Situation will the motion of the shopping cart stay the same, the correct option is (D) The two people push with a balanced face.
In this situation, the net force on the shopping cart will be zero, since the two forces are equal in magnitude and opposite in direction. If the forces are balanced, the shopping cart will not accelerate and will stay in the same state of motion (at rest or moving at a constant velocity). In scenario A and C, the forces are not balanced and therefore will cause acceleration. In scenario B, the net force will be non-zero and the acceleration will cause the shopping cart to change its velocity and direction.
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What was the name of the first oil well in the UAE?
A.Murban
B.ADNOC
C.Murhabba
D.OLPEC
Answers
Answer:
B.ADNOCExplanation:
the Abu Dhabi Petroleum Company
The first commercially viable oil discovery was made at Bab in 1960. In 1962, the company was renamed the Abu Dhabi Petroleum Company. Exports began to flow from the Jebel Dhanna terminal on December 14, 1963.
Answer:
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at what distance from a 2.45*10^-6 C charge will the electric field be 100 N/C?
Answers
Answer:14.8
Explanation:
Trust me
The distance will be = 14.85 m
What is electric field ?A region around a charged particle or object within which a force would be exerted on other charged particles or objects.
given :
Charge (q)= 2.45*\(10^{-6}\) C
Electric field (EF) = 100 N/C
to find = ? distance (r)
Electric field = 1/4π∈o * (q/\(r^{2}\))
100 = 9 * \(10^{9}\) * ( 2.45*\(10^{-6}\) / \(r^{2}\))
\(r^{2}\) = 220.5
r= \(\sqrt{220.5}\)
r = 14.85 m
The distance will be = 14.85 m
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What made "Lunar Orbit Rendezvous" such an attractive method to get to the Moon that it was selected by NASA in July, 1962
Answers
Answer:
I don't know the answer
Why do asteroids and comets differ in composition?.
Answers
Asteroids are made up of metals and rocky material, while comets are made up of ice, dust and rocky material. Both asteroids and comets were formed early in the history of the solar system about 4.5 billion years ago.
pulley and string arrangement is used to connect two objects and B as shown in the diagram below: Here_ 3.95 kg and ma 7.65 kg The string connecting the two objects of negligible mass and the pulley is frictionless The objects start from rost and move with constant acceleration What is the magnitude of the acceleration (in m/s2) of each of the objects? mts? What is the magnitude (in N) of the tension in the string? Through what distance (in m} will the two objects move in the first four seconds of motion?
Answers
The magnitude of acceleration of each object is 2.06 m/s², the magnitude of tension in the string is 60.3 N, and the two objects will move a distance of 16.4 m in the first four seconds of motion.
To find the acceleration of each object, we can use Newton's second law of motion, F=ma, where F is the net force acting on the object, m is its mass, and a is its acceleration. For object A, the net force is T-ma, where T is the tension in the string. For object B, the net force is mbg-T, where g is the acceleration due to gravity. Since the two objects are connected by the same string, their accelerations are equal in magnitude but opposite in direction. Thus, we can set up the following equations:
T - ma = ma
mbg - T = ma
Solving for a and T, we get:
a = (mb - ma)g / (ma + mb) = 2.06 m/s²
T = ma + (mb - ma)g / (ma + mb) = 60.3 N
To find the distance the two objects will move in the first four seconds of motion, we can use the equations of motion for constant acceleration:
d = vit + 1/2 at²
Since the initial velocity is zero and the acceleration is constant, we have:
d = 1/2 at² = 1/2 (2.06 m/s²) (4 s)² = 16.4 m
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Displacement
► If you walk 4 meters east then 3 meters
north, what displacement did you
travel?
Answers
Explanation:
The answer is mentioned above.
Hope it helps.
a convex mirror has a focal length of -12 cm. a lightbulb with diameter of 6 cm is placed 60 cm from the mirror
Answers
Here the focal length of the convex mirror as -12 cm, a light bulb with a diameter of 6 cm is placed 60 cm from the mirror. Hence, the image distance is -60 cm, and the image height is 6 cm.
To find the image distance and height, we will use the mirror formula for a convex mirror, which is given as follows;1/f = 1/v + 1/u. Where, f = focal length of the convex mirror;
v = the image distance;
u = the object distance
If the object distance is positive, it means the object is placed in front of the mirror, and if it is negative, it means the object is placed behind the mirror. The focal length of a convex mirror is always negative, as given above.
Therefore, u = -60 cm and f = -12 cm.
Plugging in the values in the mirror formula, we get:1/-12 = 1/v + 1/-60=> -5/60 = 1/v - (1/60) => -5/60 = (60 - v)/60=> v = -300/5= -60 cm
The image distance is -60 cm, which means the image is virtual and erect. The negative sign indicates that the image is formed behind the mirror.
To find the image height, we use the magnification formula:
m = -v/u= -(-60)/(-60)= 1
The magnification is 1, which means the image is of the same size as the object. The height of the light bulb is 6 cm, so the height of the image will also be 6 cm.
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An object accelerates 12.0 m/s² when a force of 6.0 newtons is applied to it.
What is the mass of the object
Answers
Answer:
0.5 kgExplanation:
The mass of the object can be found by using the formula
\(m = \frac{f}{a} \\ \)
f is the force
a is the acceleration
From the question we have
\(m = \frac{6}{12} = \frac{1}{2} \\ \)
We have the final answer as
0.5 kgHope this helps you
m = f/a
6 / 12 = 0.5
answer - 0.5
An object having a fixed emissivity of 0. 725 radiates heat at a rate of 10 w when it is at an absolute temperature t. If its temperature is doubled to 2t, at what rate will it now radiate?.
Answers
It will now emit at a rate of 160 W.
What exactly is emissivity?the proportion of an emitter's energy to that of a blackbody, a perfect emitter with the same temperature, wavelength, and viewing circumstances. It ranges from 0 (for the optimum reflector) to 1 and has no dimensions (for a perfect emitter).
Why is emissivity important and what does it mean?The ability to reliably measure temperature using an infrared temperature sensor or a thermal imaging camera depends critically on emissivity, which measures a material's capacity to radiate infrared energy from its surface.
What substances exhibit a high emissivity?The type of surface affects a surface's emissivity in addition to the material. A smooth and polished metal surface will have a low emissivity in contrast to a roughened and oxidized metal surface, which will have a high emissivity.
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what is the distance in mm between these minima if the diffraction pattern falls on a screen 1.2 m from the slit?
Answers
The distance in mm between these minima is 0.29 ×\(10^{-3}\) m
For first minima, m=1, Then,
\(a\sin \theta_1 = \lambda_1 \Rightarrow \sin\theta_1 = \frac{\lambda_1}{a} \Rightarrow \theta_1 = \sin^{-1}\left(\frac{589.1\times10^{-9}}{2.4\times 10^{-6}}\right) = 14.2^{\circ}\)
\(a\sin \theta_2 = \lambda_2 \Rightarrow \sin\theta_2 = \frac{\lambda_2}{a} \Rightarrow \theta_2 = \sin^{-1}\left(\frac{589.6\times10^{-9}}{2.4\times 10^{-6}}\right) = 14.22^{\circ}\)
Hence the required angle is , (14.22 - 14.2) = 0.02o
The distance between these two minima,
\(\Delta y = y_2 -y_1 = \frac{D}{a}\left( \lambda_2-\lambda_1\right) = \frac{1.4}{2.4\times 10^{-6}}\left(0.5\times 10^{-9} \right ) = 0.29\times 10^{-3} \hspace{2mm} m\)
This distance is best measured using a microscope.
The length of a particular path taken by an object between two points is its distance, such as the distance traveled through a maze. In some cases, such as when a ball is thrown straight up or the Earth completes an orbit, this can even be a closed distance along a closed curve that begins and ends at the same location. The mathematical term for this is the curve's arc length. It is also possible to signify the distance traveled: a "ahead" distance is positive and a "backward" distance is negative.
When building vehicles or mechanical gears, it can be helpful to take circular distance—the distance covered by a
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Does a wire connected to a dc source, such as a battery, emit an electromagnetic wave?
Answers
The wire connected to the DC source doesn't emit electromagnetic waves.
The electromagnetic wave is an oscillation of electric fields and magnets field that sustains each other, this wave time has the characteristics that it can travel without a material medium, for which they are of extreme importance.
It is caused by DC sources such as batteries only having a constant voltage, it is different from AC sources which have different voltage over time, AC voltage can induce the wire because AC sources have magnetic flux change. DC sources don't have magnetic flux change so they don't emit electromagnetic waves.
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Assuming equal rates of acceleration in both cases, how much further would you travel if braking from 56mi/h to rest than from 28mi/h? Above problem describes two situations, note down following parameters for each case What is the initial velocity? What is the final velocity? What is the acceleration? What do you need to find? Which formula have the all above four parameters? Write down the equation with values for both situations: 1^st: 2^nd: Since the problem is asking about a ratio you will need to divide the two equation to find the answer. A) 3.2 times farther B) 5.2 times farther C) 4.8 times farther D) 4 times farther
Answers
The answer to the problem is option C) 4.8 times farther. When comparing the distances travelled while braking from 56 mi/h to rest and from 28 mi/h to rest, assuming equal rates of acceleration, the ratio of the distances travelled is 4.8:1.
To solve this problem, we can use the equation of motion:
\(\[v_f^2 = v_i^2 + 2a \cdot d\]\)
where \(\(v_f\)\) is the final velocity, \(\(v_i\)\) is the initial velocity, a is the acceleration, and d is the distance travelled.
In the first case, the initial velocity is 56 mi/h, the final velocity is 0 mi/h (rest), and we need to find the distance travelled. Let's denote it as \(\(d_1\)\).
Plugging in the values into the equation of motion, we have:
\(\[0^2 = (56)^2 + 2a \cdot d_1\]\)
In the second case, the initial velocity is 28 mi/h, the final velocity is also 0 mi/h, and we need to find the distance travelled. Let's denote it as \(\(d_2\)\).
Using the equation of motion, we have:
\(\[0^2 = (28)^2 + 2a \cdot d_2\]\)
Dividing the two equations, we get:
\(\[\frac{d_1}{d_2} = \frac{(56)^2 + 2a \cdot d_1}{(28)^2 + 2a \cdot d_2}\]\)
Simplifying this expression yields the ratio of distances traveled, which is approximately 4.8:1. Therefore, the answer is option C) 4.8 times farther.
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Which law of motion is this and why?
A stationary bumper car is sent into motion after being hit with another bumper car.
Answers
Answer:
Third Law Of Motion.
Explanation:
The law of interaction, the third one, explains that if one body exerts a force on a second body, the second body exerts a force equal in magnitude and opposite in direction on the first body.
What type of volcanic material indicates an eruption under water? a) AA flows b) Pyroclastic flows c) Pillow lavas d) Pahoehoe flows. e) Pillow lavas.
Answers
The type of volcanic material that indicates an eruption underwater is pillow lavas. So the correct answer is option C or E.
Pillow lavas are igneous rock formations that occur when magma extrudes from a volcano's vent and cools quickly under seawater or other bodies of water. When magma comes into contact with the water, it cools quickly and solidifies into what looks like a pile of stacked pillows. Pillow lavas are a clear indication of an underwater eruption. Pillow lavas are typically found in submarine basaltic volcanoes, which are located near mid-ocean ridges, and can be found in a variety of other underwater volcanic settings.
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A carrier wave is an electromagnetic wave that can be modulated, as in frequency, amplitude, or phase, to transmit speech, music, images, or other signals. True/False
Answers
True, a carrier wave is an electromagnetic wave that can be modulated in frequency, amplitude, or phase to transmit speech, music, images, or other signals.
Electromagnetic waves are invisible forms of energy that travel though the universe. However, you can "see" some of the results of this energy. The light that our eyes can see is actually part of the electromagnetic spectrum.
This modulation allows the carrier wave to carry information and transmit it over long distances.
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Mateo moved the teacher's table with 50 N of force for 2 meters.. How
much work is done in pushing the table?
Answers
Statement:
Mateo moved the teacher's table with 50 N of force for 2 meters.
To find out:
The work done in pushing the table.
Solution:
Force (F) = 20 NDisplacement (s) = 2 mAngle between displacement and force (θ) = 0We know, work is said to be done when force acting on a body produces motion in the direction of force applied.And the formula for work done isF s Cos(θ)Therefore, the work done in pushing the table= 50 × 2 × Cos (0°) J= 100 × 1 J= 100 JAnswer:
The work done in pushing the table is 100 J.
Hope it helps.
If you have any query, feel free to ask.
What is the magnitude of the electric field between the two electrodes in ionization type detectors?
Answers
The magnitude of the electric field between the two electrodes in ionization type detectors is an electric field can be given in volts per meter.
How to calculate the magnitude of the electric field?The magnitude of the electric field varies with distance, d, from the charge based on the charge of the respective particle. Therefore, the electric field for a single point charge can be easily calculated from these measured values.
In the International System of Units, the electric field strength is measured in volts per meter (V/m).
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the coefficient of static friction is 0.754 between the soles of a 60.0 kg sprinter's running shoes and the level track surface on which she is running. determine the maximum acceleration she can achieve. do you need to know that her mass is 60.0 kg?
Answers
Yes, the information that the sprinter's mass is 60.0 kg is needed to find the normal force and to determine the maximum acceleration.
To determine the maximum acceleration that the sprinter can achieve, we need to know the coefficient of static friction between the soles of her shoes and the track surface, as well as her weight (force of gravity acting on her).
The coefficient of static friction can be used to calculate the maximum force of friction (friction force = coefficient of static friction x normal force).
The normal force is equal to the weight of the object, which is given as 60.0 kg. So the normal force is : 60.0 kg x 9.8 m/s^2 = 588 N.
The maximum force of friction is: friction force = coefficient of static friction x normal force
= 0.754 x 588 N
= 445.5 N
The maximum acceleration can be determined by dividing the force acting on an object by its mass.
a = F / m
= 445.5 N / 60.0 kg
= 7.4 m/s^2
So the maximum acceleration the sprinter can achieve is 7.4 m/s^2
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if the simulation included decomposers, would your current results change?
Answers
If a simulation included decomposers, the current results would likely change.
Decomposers play a vital role in the ecosystem by breaking down dead organic matter and recycling nutrients back into the soil. This process supports plant growth and contributes to the overall productivity of the ecosystem.
By introducing decomposers into the simulation, the nutrient cycle would become more complete, which could potentially alter the population dynamics and interactions between species. This change may lead to a more balanced and stable ecosystem, providing a clearer representation of the natural environment.
In conclusion, including decomposers would likely cause the current results to change, reflecting a more accurate depiction of ecological relationships.
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Which statement best describes the main idea of the poem
Two roads diverged in a yellow wood, And sorry I could not travel both And be one traveler, long I stood And looked down one as far as I could To where it bent in the undergrowth; Then took the other, as just as fair, And having perhaps the better claim, Because it was grassy and wanted wear; Though as for that the passing there Had worn them really about the same, And both that morning equally lay In leaves no step had trodden black. Oh, I kept the first for another day! Yet knowing how way leads on to way, I doubted if I should ever come back. I shall be telling this with a sigh Somewhere ages and ages hence: Two roads diverged in a wood, and I— I took the one less traveled by, And that has made all the difference.
A. The speaker informs the reader about two roads.
B. The speaker expresses his feelings about nature.
C. The speaker describes his unfulfilled dreams and wishes.
D The speaker explains a difficult decision he had to make.
Answers
Explanation:
option D ) is correct the speaker explain a difficult decision he had to make
hi everyone comment
if the current in the long straight wire is increasing, what current is induced in the circular loop?
Answers
If the current in a long straight wire is increasing, the current is induced in the circular loop will be generated in the nearby circular loop.
Faraday's Law states that the electromotive force (EMF) induced in a circuit is proportional to the rate of change of magnetic flux passing through it. As the current in the straight wire increases, the magnetic field around it strengthens, and the change in magnetic flux through the circular loop causes an induced current. The direction of this induced current is determined by Lenz's Law, which states that the induced current will flow in such a way as to oppose the change in magnetic flux causing it.
In this case, as the magnetic field due to the straight wire increases, the induced current in the circular loop will flow in a direction that generates a magnetic field opposing the increase in the straight wire's magnetic field. The magnitude of the induced current depends on the rate of change of the magnetic field, the loop's size, shape, and distance from the straight wire, as well as the resistance of the loop's material. If the current in a long straight wire is increasing, the current is induced in the circular loop will be generated in the nearby circular loop.
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IP Silver pellet with a ma of 1. 2 g
g
and a temperature of 88 ∘C
∘
C
are added to 270 g
g
of water at 18 ∘C
∘
C
Answers
Hence, the value of Tfinal will be =18.01786 C
The temperature of the final mixture can be calculated using the law of conservation of energy, which states that the total energy of a system remains constant.
The change in energy of the water is equal to the heat absorbed by the water from the silver pellet.
Q = mcΔT
where Q is the heat absorbed,
m is the mass of the water,
c is the specific heat capacity of water,
and ΔT is the change in temperature.
The heat absorbed by the water can be calculated as follows:
Q = mcΔT = 270 g * 4.18 J/g°C * (Tfinal - 18°C) = mcΔT
The heat absorbed by the water can be calculated as follows:
Q = mcΔT = 1.2 g * 0.24 J/g°C * (88°C - Tfinal) = mcΔT
Solving for Tfinal, we get:
Tfinal = 18°C + (Q / mc)
= 18°C + [1.2 g * 0.24 J/g°C * (88°C - Tfinal)] / [270 g * 4.18 J/g°C]
=18 + [1.2*0.24*(88-18)]/[270*4.18]
=18+(20.16/1128.6)
=18+0.01786
=18.01786 C
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A classmate is working with a source that
is labelled 18 V. The classmate refers to
the source as a cell. Why might you think
that the term cell is incorrect? How is the
source most likely related to a cell?
Answers
The term cell is incorrect because, the average voltage of a cell is 3.40 V and as already mentioned in question, the volt of source is 18 V, so cell couldn't be the appropriate word, actually the source is battery.
Now, the source is most likely related to cell because a battery which is the source here, is made up of a "group of cell".
am radio signals have frequencies between 550 and 1,600 khz. which has a broader transmission band, am or fm?
Answers
When it comes to the transmission band, FM has a broader band compared to AM.
This is because FM signals have frequencies ranging from 88 to 108 MHz, which is a significantly wider range than AM signals, which have frequencies between 550 and 1,600 kHz. The wider frequency range allows for a larger bandwidth, which translates to higher quality sound and better reception with FM radio.
In addition to having a broader transmission band, FM radio signals are also less susceptible to interference from various sources such as power lines, thunderstorms, and other electrical devices. This is because FM radio signals are transmitted using frequency modulation, which involves varying the frequency of the carrier wave to transmit the audio signal. In contrast, AM radio signals use amplitude modulation, which can be disrupted by changes in the amplitude of the wave caused by interference.
Overall, while AM radio signals have their own advantages, including longer range and better penetration of obstacles, FM radio signals have a broader transmission band and higher quality sound, making it the preferred choice for music and other audio content.
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Which of the following equations is balanced?
a. 2Al2O3 -----> 3Al + 3O2
b. 3Al2O3 -----> 3Al + 2O2
c. 2Al2O3 -----> 4Al + 3O2
d. 2Al2O3 -----> Al + 3O2
Answers
Answer: c
Explanation:
The way to check which one is the correct one is to simply multiply and see if there are the same number of atoms in both sides for each element.
a. 2×2 atoms of Al ≠ 3×1 atoms of Al
2×3 atoms of O = 3×2 atoms of O
BOTH MUST BE EQUAL FOR IT TO BE ADJUSTED!!!!!
b. 3×2 atoms of Al ≠ 3×1 atoms of Al
3×3 atoms of O ≠ 2×2 atoms of O
c. 2×2 atoms of Al = 4×1 atoms of Al
2×3 atoms of O = 3×2 atoms of O
BOTH ARE EQUAL, CORRECT ANSWER!!!
d. 2×2 atoms of Al ≠ 1×1 atoms of Al
2×3 atoms of O = 3×2 atoms of O
True or False. Water drains differently in the Northern and Southern hemispheres.
Answers
Answer: True
Explanation:
Answer:
false
Explanation:
hope this help (brainlist plz)
A) Is it possible for an object that, object with zero acceleration have velocity? If yes give an example if not give its proof.
Answers
Answer:
Yes, in case of uniform velocity
Explanation:
This is the case of uniform velocity. If a body covers equal displacement in equal intervals of time, then the velocity of a body is said to be ‘Uniform Velocity’. It meas that the velocity of a body remains constant during the motion and it does not change.
Since, acceleration is defined as the rate of change of velocity.
Therefore, if there is no change in velocity or in other words the change in velocity is zero, then the acceleration is also zero.
a = ΔV/t = 0/t
a = 0 m/s²
So, the acceleration of the body is 0 m/s², but it has a uniform velocity
Hence, it is possible for an object that, object with zero acceleration have velocity, which is the case case of uniform velocity.
A box has a mass of 75 g. It has a length of 2.0 cm, a width of 2.0 cm and a height of 3.0 cm. What is the density?
Answers
Answer:
6.25 g/cm³
Explanation:
2 cm * 2 cm * 3 cm = 12 cm³ (volume)
75 g / 12 cm³ = 6.25 g/cm³
Ice is made of water so why does it float?
Answers
Answer:Its a Soild
Explanation: