what is thermal conductivity?​

If the "shot heard around the world" could actually be heard around the world, it would take approximately 0.069 seconds.

Sound travels through the air as a mechanical wave, propagating at a certain speed. The speed of sound depends on the medium through which it travels, such as air, water, or solids. In the given scenario, we will consider the speed of sound in air.

The speed of sound in air is approximately 343 meters per second (m/s) at room temperature. Since we are considering a hypothetical situation where the sound can be heard simultaneously around the world, we can assume a distance of roughly 40,000 kilometers (or 40 million meters) around the Earth's circumference.

To calculate the time it takes for the sound to travel this distance, we divide the distance by the speed of sound: t = d / v. In this case, t = 40,000,000 m / 343 m/s ≈ 116,600 seconds ≈ 0.069 seconds.

Therefore, if the "shot heard around the world" could be heard instantaneously across the globe, it would take approximately 0.069 seconds for the sound wave to travel the Earth's circumference.

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Answer:

75 - Please Give Brainliest

Explanation:

The value of resistor R that gives the circuit in the figure a time constant of 22 μs is 220 Ω.

The circuit that is in the figure is shown below:Given that time constant (RC) = 22 μs. To find the value of resistor R, we need to use the formula for the time constant:

RC = τ, where R is the resistance and C is the capacitance of the circuit.

Rearranging the above formula, we get:R = τ / C

Where τ is the time constant and C is the capacitance of the circuit.

From the figure, the capacitance is given as 0.1 μF

.Substituting the values of τ and C in the above formula, we get:

R = (22 × 10⁻⁶ s) / (0.1 × 10⁻⁶ F)

R = 220 Ω

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curious about what you're observing. This phenomenon is known as a pinhole camera or camera obscura.

When sunlight passes through the pinhole in the window shade, it acts as a tiny aperture. The light rays coming from different points on the outside scene pass through this aperture and create an image on the opposite wall.

The pinhole camera works based on the principles of optics. The small size of the aperture limits the amount of light entering the camera, and it also acts as a point source of light. As a result, the light rays from different points in the scene form an inverted and reversed image on the wall.

The image formed by the pinhole camera will be dim and lack detail due to the limited amount of light entering the camera. However, the image will be sharp as long as the pinhole is small and the distance between the pinhole and the wall is significant.

The phenomenon you observed with the patch of light on the far wall is a simple demonstration of how light travels in straight lines and forms images. It's a fascinating way to explore the basic principles of optics.

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Simply put different aspects of the electromagnetic spectrum reflect differently. Certain chemicals will absorb different frequencies of light while reflecting others.

Mugabe gained power by using political strategies, forming alliances, and exploiting his status as a liberation hero within ZANU-PF.

Robert Mugabe, the former president of Zimbabwe, was able to build power through a combination of political strategies and alliances. One key factor was his involvement in the liberation struggle against white minority rule in Rhodesia (now Zimbabwe).

Mugabe emerged as a prominent figure within the Zimbabwe African National Union (ZANU) party, which later merged with the Zimbabwe African People's Union (ZAPU) to form the Zimbabwe African National Union - Patriotic Front (ZANU-PF). Mugabe's role as a liberation hero and his ability to mobilize support among the majority black population of Zimbabwe gave him a strong power base.

Within ZANU-PF, Mugabe strategically positioned himself and gained influence by forming alliances and outmaneuvering rivals. He rose to become the party's leader and played a key role in negotiating the Lancaster House Agreement in 1979, which paved the way for Zimbabwe's independence in 1980. Mugabe became the country's first prime minister and later transformed the position into an executive presidency, consolidating his authority.

Mugabe maintained power through various means, including controlling key institutions such as the military, intelligence agencies, and the ruling party. He also utilized patronage networks, distributing resources and positions to loyal supporters within the party and government. Mugabe's policies, such as the controversial land reform program, further solidified his power base by appealing to nationalist sentiments and redistributing land from white farmers to black Zimbabweans.

However, Mugabe's consolidation of power was also marked by authoritarianism, human rights abuses, and a declining economy. His grip on power faced challenges over the years, including opposition movements, internal party factions, and economic crises. Ultimately, his rule came to an end in 2017 when he was ousted from power following a military intervention.

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Answer:

A Gap is the space between

Answer: distance, a gap

Explanation:

Answer:

The action that would cause the concentration of a solution to remain constant is removing solution from the container.

What is concentration of a solution?

The concentration of a solution is the measure of the amount of solid particles (solute) that has been dissolved in the given amount of a solvent.

Adding water to a solution will dilute the solution, hence changes the concentration of the solution.

Also, adding solute will change the concentration of the solution.

Thus, the action that would cause the concentration of a solution to remain constant is removing solution from the container.

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The data set that is most likely from the car equipped with ABS is :

Although the plots related to your question is missing attached below is the missing data.  

The First plot ( acceleration vs time ) plot is the data that represents the application of brakes in a car fitted with ABS ( antilock braking system ) because of the absence of skidding effect between 6.5 and 9 seconds in the graph.

The skidding effect is present in the second plot around the same time because the car is not fitted with ABS  

Hence we can conclude that the graph that shows the car fitted with ABS is the first plot .

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Answer: The correct option is C.

Volley principle

Explanation:

It is volley principle because volley principle states that fibers or neurons in the auditory nerve respond to stimulus by firing action potential in phase to another and after it is combined a greater frequency of sound wave is encoded and it is then send to the brain for interpretation and it is then interpreted as information to be used.

Answer:

c

Explanation:

edge 2020

Answer:

Actually, the correct answer is D. The system releases 75 J of heat, and its volume doubles.

Explanation:

I took this computer-scored test, and while I was stuck on this answer for a while, I was able to get 100%. This was my thought process:

We know that molecular motion increases with an increase in temperature, because collisions increase. For that reason, for molecular motion to decrease in a system, as the question states, the system must RELEASE heat and decrease in temperature.  Additionally, when a system's volume is smaller, its molecular motion increases. This is because the molecules hit the container more easily and more often. If the volume is halved then, the molecules would have MORE motion, which we aren't looking for in this question! Therefore, the volume must DOUBLE so that less molecular motion takes place. The answer is D! :)

Answer:

Speed = 300 m/s

Explanation:

Given the following data;

Frequency = 30 Hz

Wavelength = 10 m

To find the speed of the wave;

Mathematically, the speed of a wave is given by the formula:

\( Speed = wavelength * frequency \)

Substituting into the formula, we have;

\( Speed = 10 * 30 \)

Speed = 300 m/s

Answer: First runner has more kinetic energy

Explanation:

The formula for kinetic energy is defined to be:

\(KE=\frac{1}{2} mv^2\)

Plug in the value for each runner to get:

\(KE_1=0.5(46kg)(8m/s)^2=1472J\)

\(KE_2=0.5(92kg)(4m/s)^2=736J\)

Answer:

The answer is f

Explanation:

I don't have one

The fraction of the total energy is in the form of kinetic energy when the block is at position (x =1/2 A) is 3/4

When the block is at position x=1/2A, its velocity is zero and the total energy is entirely potential energy. At this position, the displacement from equilibrium is half of the amplitude, so x = 1/2 A.

The total energy of the system is given by: E = 1/2 kA², where k is the spring constant and A is the amplitude.

At position x=1/2A, the potential energy is: U = 1/2 k (1/2 A)² = 1/8 kA².

The kinetic energy is equal to the total energy minus the potential energy:

K = E - U = 1/2 kA² - 1/8 kA² = 3/8 kA².

Therefore, the fraction of the total energy in the form of kinetic energy when the block is at position x=1/2A is:

K/E = (3/8 kA²) / (1/2 kA²) = 3/4.

The correct answer is E. 3/4.

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Answer:

Explanation:

High concentrations of hydrogen ions yield a low pH (acidic substances), whereas low levels of hydrogen ions result in a high pH (basic substances). The overall concentration of hydrogen ions is inversely related to its pH and can be measured on the pH scale

_______________

\(I_2=2I_1\)

\(L=\text{const}\)

_______________

\(\displaystyle \frac{W_2}{W_1}\; - \;?\)

_______________

\(\displaystyle \boldsymbol{\frac{W_2}{W_1}}=\frac{\dfrac{LI_2^2}{2} }{\dfrac{LI_1^2}{2} } =\frac{I_2^2}{I_1^2} =\bigg(\frac{I_2}{I_1} \bigg)^2=\bigg(\frac{2I_1}{I_1} \bigg)^2=2^2=\boldsymbol{4}\)

Differences in size are often described as differences in the order of magnitude. That's the difference calculated in factors of 10.

At the time of fertilization-

0.01cm = 1/100 = \(10^{-2}\)

At the time of birth-

50cm = 5 ×  \(10^{1}\)

Meaning there is 3 order of magnitude between the egg(zygote) (0.01cm) and child after the birth ( 50cm ).

Notice that when dividing numbers in standard form, we subtract the powers.

When comparing orders of magnitude, actual distances can be approximated. It’s the relative difference that is important.

Hence, the change in the order of magnitude of length from fertilization to birth of a child is 3 ( three )

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Pressure equals force divided by area.

P=F/A

The equation above shows that pressure is directly proportional to force, but inversely proportional to area. At a constant area, pressure increases as the magnitude of the force applied also increases.

for example;

A heavy sofa exerts more pressure on the floor compared to an empty box in the same area.

Pressure increases as the area decreases.

A finger exerts more pressure by pressing on the skin compared to the pressure exerted by a needle attached to a syringe. A finger may cause slight depression on the skin when pressed, but may not inflict pain at all.

however, when the same force is applied to a needle, the pressure produced is large enough to hurt the skin.

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Answer: The greater the area, the smaller the pressure applied and the smaller the area, the greater the pressure applied

Explanation: As one applies a certain force to a body of a large area, the pressure applied will be little and a force applied to a body of a small area, the pressure applied will be greater for pressure will tend to be greater if applied to a body of small area and therefore the force applied will create a strong pressure

The magnetization related with both the wave has a direction of \(\hat{k}\), as stated in the sentence.

A waveform signal that is carried in space or down a wire has a wavelength, which represents the separation between two identical places (next crests) in the consecutive cycles. This length is often defined in wireless systems in kilometers (m), centimeters (cm), or millimeters (mm) (mm). A wavelength is the separation between two identical spots in two consecutive cycles of a wave's crests.

The direction of a planar electromagnetic wave's propagation is

\(\hat{k}=+\hat{i}\) , \(\hat{k}\) = propagation constant

Direction of electric field is \(+\hat{j}\)

So, direction of magnetic field is \(\hat{B}=\hat{K} \times \hat{E}\)

\(\hat{B}=\hat{i} \times \hat{j}=\hat{k}\)

So correct option is \(\hat{k}\)

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The complete question is-

A plane electromagnetic wave, with wavelength 3 m, travels in vacuum in the positive x direction with its electric vector E, of amplitude 227 V/M, directed along y axis. What is the direction of the magnetic field associated with the wave? (i,j,k are the unit vectors corresponding to x, y and z directions)

(a). j

(b). -j

(c). i

(d). k

(e). -k

Answer:

The magnet produces an electric current in the wire

Explanation:

Answer: the first one is right

Explanation:

Answer:

.639 sec

Explanation:

Set up the distance equation

xf = xo + vo t + 1/2 a t^2     xf = 0    xo = 2    vo = 0    a =- 9.81

0 = 2 + 1/2 (-9.81) t^2          t = .639 sec

Answer: the answer is d $19.95

Explanation:

chicken dinner: 6.95 x 3 = 20.85

burger: 5.75

20.85 + 5.75 = 26.6

26.6 divided by 4 (bc theres 4 ppl and the bill needs to be split equally)

26.6/4= 6.65

and since 3 friends are paying him back u gotta do 6.65 x 3 = 19.95

Answer:

It is (A) Calculate the force needed to stop the vehicle.

Explanation:

Answer:

V = f * λ           velocity equals frequency * wavelength

If f is increased then λ must decrease for the velocity to remain constant.

If light were shone on the receptive field of an OFF cell with a center and surround, it would cause excitation if it is shone on the surround and inhibition if it is shone on the center.

In an OFF cell with a receptive field that contains a center and surround, light would cause excitation if light were shone. A receptive field is a group of cells in the visual system that is receptive to a specific region of the visual field.

The receptive field of an OFF cell is such that when light is shone on the center of the receptive field, it causes inhibition of the cell, but when light is shone on the surround of the receptive field, it causes excitation of the cell.

Therefore, if light were shone on the center of the receptive field of an OFF cell with a center and surround, it would cause inhibition of the cell. But if light were shone on the surround of the receptive field of an OFF cell with a center and surround, it would cause excitation of the cell.

In conclusion, if light were shone on the receptive field of an OFF cell with a center and surround, it would cause excitation if it is shone on the surround and inhibition if it is shone on the center.

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