what is the length of a box in which the minimum energy of an electron is 2.0×10−18 j ?

According to the evolution of a heating curve, the correct option is B. The plateau represents the change of a substance from one phase to another where temperature does not increase.

Heating curves are graphic representations of the relationship between a substance being heated or cooled and their changes in state as the temperature reaches certain values or rates.

In general,

Let us assume a solid substance is absorbing heat. The evolution of the curve will be as follows,

1) As temperature increases, the substance will absorb heat but it will not change in state. The curve will proportionally grow.

2) At a certain temperature, the substance will change from solid to liquid. At this point, the temperature will remain the same, but for a period, the substance will keep changing to the liquid phase. This is a plateau.

3) As temperature increases, the liquid will gain heat, but the substance will still be liquid. The curve will proportionally grow.

4) The substance will gain heat until temperature reaches a new transition value in which liquid initiates evaporation. At this point, there is a new plateau.

If temperature decreases, the process will be inverse. The substance will get cooled and will pass from gassy state to liquid and then from liquid to solid again.

For a better understanding, you will find a heating curve in the attached files.

The correct option is B. The plateau represents the change of a substance from one phase to another where temperature does not increase.

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Answer: d

Explanation:

The translation of the conclusion "I am Newton, Maxwell, and Einstein" is an expression of the speaker identifying themselves with the intellectual contributions and achievements of these three renowned scientists in the field of physics.

The statement signifies a sense of connection or affiliation with the groundbreaking work and ideas put forth by Isaac Newton, James Clerk Maxwell, and Albert Einstein.

By stating "I am Newton, Maxwell, and Einstein," the speaker implies that they perceive themselves as embodying or being influenced by the profound scientific concepts and theories proposed by these iconic figures.

Newton is known for his laws of motion and universal gravitation, Maxwell for his electromagnetic theory, and Einstein for his theory of relativity.

By associating themselves with these scientists, the speaker may be suggesting that they possess a deep understanding and appreciation for the fundamental principles and discoveries that have shaped our understanding of the physical world.

In essence, the statement "I am Newton, Maxwell, and Einstein" represents a symbolic expression of the speaker's identification with the intellectual legacy and contributions of these influential physicists.

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ANSWER:

(a) 0.100 m^3

STEP-BY-STEP EXPLANATION:

We have that the force is equal to mass times gravity, therefore, we can calculate the mass, because the difference in force would be the volume of the stone.

Therefore

Now, we know that the density is equal to the quotient between the mass and the volume, therefore we can calculate the volume like this:

Therefore the volume of the piece is 0.100 cubic meters.

Answer:

Explanation:

The required mass of the object when net force on it, distance moved and final velocity are given is calculated to be 4 kg.

The net force on the unknown mass object is 20 N.

Distance travelled is 10 m.

Final velocity is 10 m/s.

The object starts from rest, so u = 0.

Mass of the object is to be calculated.

The force is given by the expression, F = m a

Making 'm' as subject, we have,

m = F/a ---(1)

Acceleration can be found using the expression, v² - u² = 2 a s ---(2)

a = (v² - u²)/2 s = (10² - 0)/(2×10) = 100/20 = 5 m/s²

Using it in (1),

m = F/a = 20/5 = 4 kg

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If we pick a fundamental component of the cross-section, then the infinitely long cylinder's surface area.

The small elemental component therefore has a small length rd. in the radial direction of the cylinder such that the cross-sectional area is then equal to 2r rd. When the total of (volume charge density elemental cross-sectional area) is equal to the linear density along the full radial length of the cylinder. This is, If so, then = 0rR 2r dr Summarizing from 0 to R next Following that, = R0 (0rR 2r) rd. Then, = R0 0R 2r2 rd. Consequently, = [0R 2r3/3]. ᴿ₀, Now λ = (2π ρ₀R/3) [ r³ ] ᴿ₀ Then λ = (2π ρ₀R/3) [ R³ ]. Now λ = 2π ρ₀R⁴/3. Thus, ρ₀ = 3λ/(2πR⁴). We employ a cylindrical surface parallel to the charge cylinder to define a Gaussian surface that utilities the symmetry of the problem.

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Answer: 1.25 A

Explanation:

I = R/V  (Ohm's Law)

I = 150 Ω / 120 V = 1.25 A

✍ We can this formula:

\(\huge {\boxed {\sf v = g \cdot t }}\)

\(\huge {\text {$ \sf v = 9,8 \cdot 2,5 \Longrightarrow \boxed {\boxed {\bf v= 24,5 }} $ }}\)

Answer:

A mineral has a volume of 6 mL and a mass of 12g.

Explanation:

Was this right?

Assuming the speed of the wave is taken as the speed of sound wave in air that is 340 m/s. The wavenumber for 262 Hz is 0.77 m⁻¹ and that for 294 Hz is 0.86 m⁻¹ .

The wave number of a wave is the number of wavelengths passing through unit length. It is the inverse of wavelength.

Wave number is directly proportional to the frequency.

The relation between frequency and wave number is written as:

wave number = ν/v

where v is the speed of the wave and ν is the frequency.

The wave number of the wave with the frequency of 330 Hz is then,

330 Hz/ 340 m/s = 0.97  m⁻¹

and for the remaining frequencies:

349 Hz /340 m/s =  1.052  m⁻¹

for 392 Hz,

392 Hz/340 m/s = 1.15  m⁻¹

For 440 Hz,

440 Hz/340 m/s = 1.29  m⁻¹.

for 494 Hz,

494 Hz/340 m/s = 1.45  m⁻¹

and  for 523 Hz,

523 Hz/340 m/s = 1.53  m⁻¹

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There is no god but Allah (SWT) and Prophet Muhammad (PBUH) is his messenger. This is a contain of confession of faith in Islam religion.

In language, اسلام comes from the word سَلَم  /سِلْم which means safe (as-salām), peace and tranquility, (al-shulhu wa al-amān), surrender (al-istislām), submission (al-khudlū'/al- id'zān), obedient (al-thā'ah). So, Islam means safety and peace because surrender is only to Allah SWT, who has no god but Him. Meanwhile, according to the term Islam is dīn or religion that originated from Allah SWT who was brought down through His Apostles, from the first Prophet: Adam as to the last Prophet: Muhammad saw for the benefit of mankind in this world and in the hereafter .

However, because divine (sky) religions have been changed by humans so that they are no longer original, the term Islam is only aimed at what was brought down by the Prophet Muhammad, namely something that was sent down by Allah SWT in the valid Al -Qur'an and al-Sunnah in the form of rules that contain orders, prohibitions and instructions for human welfare in this world and in the hereafter.

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Answer:

The answer is B.

Explanation:

They are in control of the experiment, they can change it the variables to better help the experiment.

Answer:

b

Explanation: its b

The wind turbine with a blade diameter of 25 m and an average wind velocity of 6 m/s has an average electric power output of 172.34 kW. For an annual operating time of 8000 hours, the turbine will produce approximately 1,378,720 kWh of electricity.

If sold at a price of $0.09/kWh, the revenue generated from the electricity produced by the turbine would be approximately $124,086.72. To calculate the average electric power output, we can use the formula:

\(\[P = \frac{1}{2} \times \text{{density of air}} \times A \times v^3 \times \text{{efficiency}}\]\)

Substituting the given values into the formula, we can calculate the average electric power output:

\(\[P = \frac{1}{2} \times 1.3 \, \text{{kg/m}}^3 \times \left(\frac{\pi}{4} \times (25 \, \text{{m}})^2\right) \times (6 \, \text{{m/s}})^3 \times 0.34 \approx 172340 \, \text{{watts}} \approx 172.34 \, \text{{kW}}\]\)

To determine the amount of electricity produced for an annual operating time of 8000 hours, we multiply the average electric power output by the operating time:

\(\[\text{{Electricity produced}} = P \times \text{{operating time}} = 172.34 \, \text{{kW}} \times 8000 \, \text{{h}} = 1,378,720 \, \text{{kWh}}\]\)

Finally, to calculate the revenue generated, we multiply the electricity produced by the selling price per kilowatt-hour:

\(\[\text{{Revenue}} = \text{{Electricity produced}} \times \text{{price per kWh}} = 1,378,720 \, \text{{kWh}} \times \$0.09/\text{{kWh}} \approx \$124,086.72\]\)

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The force of gravity between two objects decreases rapidly when the distance between them increases.

The force of gravity is the force of attraction between two objects with mass. Gravity holds the planets in orbit around the sun. It holds moons in orbit around their planets. It is also what brings apples falling from trees and makes objects land on the ground. Gravity is what keeps all of the planets in orbit around the sun. The sun's gravity is what keeps the planets in orbit around it. The planets are constantly moving in an oval-shaped orbit. That is what keeps each planet in a path that doesn't run into the others.

Gravity is a force of attraction between two objects with mass. It is proportional to the product of the masses of two objects and inversely proportional to the square of the distance between them. According to the law of gravity, the force of gravity between two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them. Therefore, the force of gravity between two objects decreases rapidly when the distance between the objects increases.

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the magnitude of the average force required to stop the sled is 16 times the velocity of the sled in meters per second.

To calculate the magnitude of the average force required to stop the sled, we can use the concept of impulse and momentum. The equation that relates these two concepts is:

FΔt = mΔvwhere F is the force, Δt is the time interval during which the force is applied, m is the mass of the object, and Δv is the change in velocity.Let's assume that the sled was initially moving with a certain velocity v and that you want to bring it to a complete stop.

The final velocity of the sled will be 0 m/s. Since the mass of the child and sled is 32 kg, we can use the following equation to calculate the average force required to stop the sled:

FΔt = mΔvF Δt = (32 kg) (- v)F Δt = -32v

To determine the value of F, we need to know the time interval Δt during which the force is applied. If we assume that it takes 2 seconds to bring the sled to a stop, then:

F (2 s) = -32vF = -16v Newtons

Therefore, the magnitude of the average force required to stop the sled is 16 times the velocity of the sled in meters per second.

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Weight = (mass) x (gravitational acceleration where the mass is)

Weight = (1360 kg) x (9.8 m/s²)

Weight = 13,328  kg-m/s²

That's 13,328 Newtons

Given:-

To Find: Weight (W).

We know,

W = mg

where,

Thus,

W = (1360 kg)(9.8 m/s²)

→ W = 13,328 N (D)

One way that Ms. Morimoto’s perspective is the same as President Truman’s is the belief that working peace is something we all do.

This is referred to as the officer in whom the chief executive power of a nation is vested and in most climes he/she is voted in after a election and the tenure could be four years etc.

The way in which Ms. Morimoto’s perspective is the same as President Truman’s is the belief that working peace is something we all do. This helps to prevent different types of conflict and in severe cases war which is therefore why it should be embraced.

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(a) The activity of the radiation source is 145 Bq. (b) The activity of the radiation source is 3.92 x 10^-3 Ci.

The activity of a radioactive source is defined as the rate of decay of radioactive atoms within it. The number of counts recorded by a radiation detector is proportional to the activity of the source. In this case, the detector recorded 8700 counts in 1 minute, so the activity of the source is 8700 counts per minute (cpm).

To convert cpm to becquerels (Bq), we use the conversion factor 1 Bq = 1 decay per second (dps), so the activity is 8700/60 = 145 Bq. To convert to curies (Ci), we use the conversion factor 1 Ci = 3.7 x 10^10 dps, so the activity is 145/3.7 x 10^10 = 3.92 x 10^-3 Ci.

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\(2v_{0}\) speed should he have given the ball.

here,

initial speed of the ball is v₀

let the resistive force be f and the distance of the hole be d

when  it cover distance d/4

using work energy theorem

work done grass force = change in kinetic energy

F × d/4 = 0.5 × m × \(v_{0} ^{2}\)

F = 2 ×m×\(\frac{v_{0} ^{2} }{d}\)                                        (1)

for covering the distance d

let the velocity be v

work done grass force = change in kinetic energy

F ×d = 0.5 × m × \(v^{2}\)

putting F from (1)

2 ×m× \(\frac{v^{2} _{0} }{d}\)×d = 0.5 ×m × \(v^{2}\)

4 × \(v_{0} ^{2}\) =    \(v^{2}\)

v =  \(2v_{0}\)

What is work-energy theory and how is it supported?

According to the work-energy theorem, the work done by the net force exerted on a body equals the change in kinetic energy. W = kf - ki is the simplest way to express it. The work energy theorem equation is the one shown above. If the body's kinetic energy declines, the net work done W becomes negative.

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Answer: valence electrons?

Explanation:

The that is happening inside a star while it expands into a subgiant  is that it is fusing hydrogen into helium in a shell outside the core.

The expansion of the outer layers of the star into the subgiant size  can be seen as one that is balance and bring aboput  the increase of energy generated by the hydrogen shell fusion wehich do make the star to nearly maintain its surface temperature.

It shopuld be noted that it causes the spectral class of the star to change very little  and this can be felt from the lower end of this range of star mass.

In conclusion, the Fusion as described can be seen as one that do occurs when two atoms slam together so the formation of the heavier atom,  can be acheied as seen in the way the hydrogen fuss into helium in a shell outside

Therefore, the second option is correct.

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λ = 5 x 10^-7 m, i.e the wavelength

the energy in the wave.

= c / λ

c =( 3 x 10^ 8 m/s)

f = 3x10^8ms-¹ /5 x10^-7m

= 6x10^14 Hz.

Answer:

because our some of the energy goes from our eyes

explanation;

There are several reasons why it's important to close our eyes while we sleep. Closed eyelids block light, which stimulates the brain to wakefulness. Closing our eyes also protects and lubricates the eyes while we sleep

Answer:

A

Explanation:

The change in speed on slopes is due to gravity. Therefore, when going downhill, objects accelerate

Answer:

The car starts to accelerate at section A, since it is travelling down a slope. It accelerates due to gravity acting on the downwards direction.

The accelerations for each problem are:

1. 2.22m/\(s^{2}\)

2. 7m/\(s^{2}\)

3. 1.45m/\(s^{2}\)

4. 20m/\(s^{2}\)

The acceleration which is gained by the object because of gravitational force is called its acceleration due to gravity. Its SI unit is m/\(s^{2}\). Acceleration due to gravity is a vector, which means it has both magnitude and direction. The acceleration due to gravity at the surface of the Earth is represented by letter g. It has standard value defined as 9.80665 m/s2 (32.1740 ft/s2). However, actual acceleration of a body in free fall varies with location.

1. Initial velocity=0 km/h

Final velocity=24 km/h= 6.66m/s

Time=3 seconds

acceleration =\(\frac{6.66-0}{3}\)=2.22m/\(s^{2}\)

2. Initial velocity=0 km/h

Final velocity=35 m/s

Time=5 seconds

acceleration = \(\frac{35-0}{5}\)=7m/\(s^{2}\)

3. Initial velocity=20 km/h=5.55\(m/s^{2}\)

Final velocity=60 km/h= 20m/\(s^{2}\)

Time=10 seconds

acceleration= \(\frac{20-5.55}{10}\)= 1.45m/\(s^{2}\)

4. Initial velocity=50 m/s

Final velocity=150 m/s

Time=5 seconds

acceleration= \(\frac{150-50}{5}\)= 20m/\(s^{2}\)

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To find the distance that the car slides once the brakes are applied, we can use energy analysis. We know that the initial kinetic energy of the car is given by:

E_i = 0.5 * m * v^2 = 0.5 * 14700 N * 25 m/s^2 = 148750 J

And the final kinetic energy of the car is zero, since it comes to a stop. The change in kinetic energy is therefore:

ΔE = E_f - E_i = 0 - 148750 J = -148750 J

The work done by the brakes is equal to the change in kinetic energy, so we can write:

W = ΔE = -148750 J

The braking force is given as 7100 N, so the distance that the car slides is given by:

d = W/F = -148750 J / 7100 N = -20.9 m

Therefore, the car will slide a distance of approximately 20.9 meters once the brakes are applied.