a disk starts rotating from rest and accelerated uniformly to a velocity of 25 m/s in 10 seconds. if the radius of the disk is 50 m, what is the acceleration of car after 10 seconds?

The minimum duration of the pulse is approximately 3.27 femtoseconds. This calculation is based on the uncertainty principle and the given uncertainty in energy, wavelength, and Planck's constant.

According to the uncertainty principle in quantum mechanics, there is a fundamental limit to the precision with which certain pairs of physical properties, such as energy and time, can be simultaneously known. In the case of light, the uncertainty principle relates the uncertainty in energy (∆E) to the uncertainty in time (∆t) through the equation:

∆E ∆t ≥ h/2π

where ∆E is the uncertainty in energy, ∆t is the uncertainty in time, and h is Planck's constant (approximately 6.626 × 10^(-34) J·s).

We are given the uncertainty in energy as 1.0% of the total energy of the photons. This can be expressed as:

∆E = 0.01 × E

where E is the total energy of the photons.

The energy of a photon can be calculated using the equation:

E = hc/λ

where h is Planck's constant, c is the speed of light in a vacuum (approximately 3.0 × 10^8 m/s), and λ is the wavelength of the light.

Substituting the given wavelength into the equation:

E = (6.626 × 10^(-34) J·s × 3.0 × 10^8 m/s) / (615 × 10^(-9) m)

E ≈ 3.22 × 10^(-19) J

Substituting the value of ∆E into the uncertainty principle equation:

0.01 × E ∆t ≥ h/2π

0.01 × (3.22 × 10^(-19) J) ∆t ≥ (6.626 × 10^(-34) J·s) / (2π)

0.01 × (3.22 × 10^(-19) J) ∆t ≥ 1.05 × 10^(-34) J·s

∆t ≥ (1.05 × 10^(-34) J·s) / (0.01 × 3.22 × 10^(-19) J)

∆t ≥ 3.27 × 10^(-15) s

To convert the time to femtoseconds (fs), we multiply by 10^15:

∆t ≈ 3.27 fs

Therefore, the minimum duration of the pulse is approximately 3.27 femtoseconds.

The minimum duration of the pulse is approximately 3.27 femtoseconds. This calculation is based on the uncertainty principle and the given uncertainty in energy, wavelength, and Planck's constant.

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Answer:

Answered in explanaion.

Explanation:

REST: When an object does not change its position with respect to its frame of reference or surrounding, then the object is said to be in the state of rest.

CONSTANT SPEED: When the object covers equal distance in equal intervals of time, the object is said to be moving with constant speed.

ACCELERATING: An object is said to be accelerating when the speed of the object increases with respect to time.

Answer:

i think its its c but im not positive :>

Explanation:

Answer:

Deposition

Explanation:

I searched it and saw this answer, so I hope it helps you.

"When a volcano erupts, ash can enter Earth's atmosphere. Eventually, the ash falls back down to Earth's surface. The term deposition describes the falling of volcanic ash to Earth's surface"

Answer:

A

Explanation:

Answer:

Andrew's dog's speed was 1.89 m/s

Explanation:

Motion at Constant Speed

An object is said to travel at constant speed if the ratio of the distance traveled by the time taken is constant.

This can be written as the formula below:

\(\displaystyle v=\frac{d}{t}\)

Where  

v = Speed of the object

d = Distance traveled

t = Time taken to travel d.

Andrew's dog run a distance of d=17 meters in a time of t=9 seconds, thus its speed was;

\(\displaystyle v=\frac{17}{9}\)

v = 1.89 m/s

Andrew's dog's speed was 1.89 m/s

Answer:

2. erect and magnified

Answer is erect and magnified

Magnitude of the gravitational force exerted by earth on a 2.0- kg brick when the brick is in rest is calculated to be 19.54 N.

The gravitational force pulls objects with mass towards each other. We often think about the force of gravity from Earth but this force is what keeps your body on the ground. Any object having mass exerts a gravitational force on all other objects with mass.

We say that gravitational force is attractive because it always pulls masses together and never pushes them apart. Gravitational force is directly proportional to the mass of both interacting objects such that, more the mass of, greater is gravitational force .

F= GMm/ R²

= (6.67 *10⁻¹¹ * 6 * 10⁻²⁴ *2)/(6.4* 10⁶)

= 19.54 N

the magnitude of the gravitational force exerted by earth on a 2.0- kg brick when the brick is at rest = 19.54 N

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Answer:

1) 6.53 × 10^5

2) 1.2943 × 10^5

3) 2.263 × 10^3

4) 1.48 × 10^-2

5) 9.04 × 10^-2

The location in this diagram do the magnetic field lines show that the magnetic field is strongest is in C and wekeness in D.

The lines representing the magnetic field are closed, that is, they have no beginning or end. This can be observed when we place iron filings on a sheet of paper, over a bar magnet: the pattern of lines formed continues on the part of the paper that is on the magnet, closing.

In the region of the poles we see that the lines of magnetic induction are closer to each other, therefore, we consider that close to the poles the magnetic field is more intense. In this case it is stronger in C and weaker in D.

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Answer:

The strongest is C

Explanation:

Just took the test and got it right, I don't need to over-explain it

The catch in this one is:  We don't know how much force the student used to push the bike.  

It wasn't necessarily the 100N.  That's just the weight of the bike. But you know that you can push a car, a wagon, or a bicycle hard, you can push it not so hard, you can give it a little push, you can give it a big push, you can push it strong, you can push it weak, you can push it medium.  The harder you push, the more it'll accelerate, but it's completely up to you how hard you want to push.  That's what's so great about wheels !  That's why they were such a great invention ! This is where I made my biggest mistake. This guy came into my store one day and said he's got this great invention, it's definitely going to take off, it'll be a winner for sure, he called it a "wheel".  I looked at it, I turned it over and I looked on all sides. I thought it was too simple.  I didn't know then it was elegant. I threw him out.  I was so dumb.  I could have invested money in that guy, today I would have probably more than a hundred dollars.

Anyway, can we figure out how much force the student used to push with ?  Stay tuned:

-- The bike covered 15 meters in 5 seconds.  Its average speed during the whole push was (15m/5s) = 3 meters/sec.

-- If the bike started out with no speed, and its average speed was 3 m/s, then it must have been moving at 6 m/s at the end of the push.

-- If its speed increased from zero to 6 m/s in 5 seconds, then its acceleration was (6m/s / 5 sec) = 1.2 m/s²

-- The bike's weight is 100N.  

(mass) x (gravity) = 100N

Bikemass = (100N) / (9.8 m/s²)

Bikemass = 10.2 kilograms

-- F = m A

Force = (mass) x (acceleration)

Force = (10.2 kg) x (1.2 m/s²)

Force = 12.24 N

-- Work = (force) x (distance)

Work = (12.24 N) x (15 m)

Work = 183.67 Joules

-- Power = (work done) / (time to do the work)

Power = (183.67 joules) / (5 seconds)

Power = 36.73 watts

There are 20,971,520 strings of eight English letters that contain no vowels when letters can be repeated.To calculate the number of strings of eight English letters that contain no vowels.

we need to consider the total number of possible choices for each letter position.

In the English alphabet, there are 26 letters, including five vowels (A, E, I, O, U) and 21 consonants.

Since we want to create strings without vowels, we can choose any of the 21 consonants for each position in the string.

For each of the eight positions in the string, there are 21 choices (consonants) available.

Therefore, the total number of strings can be calculated as:

Total number of strings = Number of choices for each position ^ Number of positions

Total number of strings = 21^8 = 20,971,520

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The frequency of the P allele is 0.75, and the frequency of the p allele is 0.25.

The frequency of the B allele is 0.6, and the frequency of the b allele is 0.4. This is calculated using the Hardy-Weinberg equation: p^2 + 2pq + q^2 = 1, where p and q are the frequencies of the two alleles and p^2, 2pq, and q^2 are the frequencies of the three genotypes (BB, Bb, and bb). In this case, p^2 = 0.36 (3000/8000), 2pq = 0.48 (2*3000/8000), and q^2 = 0.16 (2000/8000).

The null hypothesis is that the genes encoding for this trait are not linked. To test this, we calculate the expected frequencies of the four genotypes under the assumption of no linkage and compare them to the observed frequencies using a chi-square test.

If the calculated chi-square value is less than the critical value for the given degrees of freedom and level of significance, we fail to reject the null hypothesis. If the calculated chi-square value is greater than the critical value, we reject the null hypothesis and conclude that the genes are linked.

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A galaxy cluster contains between 50 to 1,000   galaxies.

A supercluster's galaxy clusters are frequently millions of light years apart from one another, making it difficult to estimate their distance with accuracy. The distance between us and the galaxy clusters in the Hydra Supercluster, which is around 100 million light years long, ranges from 105 to 160 million light years.

In accordance with this theory, groupings of dozens of galaxies are gravitationally drawn together to create galaxy clusters, which then combine to form clusters of hundreds or even thousands of galaxies.

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When a prismatic bar of circular cross-section is subjected to pure torque, all of the given choices (a, b, c) are correct.

All cross-sections of the bar remain plane, meaning they do not deform or twist out of their original shape. Additionally, every cross-section is subjected to the same internal torque, denoted as T. Lastly, a diameter of the circular cross-section remains straight, maintaining its original alignment.

When a prismatic bar of circular cross-section is subjected to pure torque, the torque is applied at one end of the bar and creates a twisting moment throughout the length of the bar.

In this scenario, all cross-sections of the bar remain plane, meaning they do not deform or twist out of their original shape. This is because the torque acts parallel to the axis of the bar, causing the bar to rotate as a whole without any distortion of its cross-sections.

Additionally, every cross-section of the bar is subjected to the same internal torque, denoted as T. This means that the twisting effect experienced by each cross-section is equal in magnitude.

As a result, the stress distribution throughout the bar remains uniform, and all cross-sections experience the same level of torque. Furthermore, a diameter of the circular cross-section remains straight when a prismatic bar is subjected to pure torque.

This implies that the original alignment of a diameter is maintained, and it does not bend or deform due to the applied torque. The rotational force is transmitted uniformly across the cross-section of the bar without causing any distortion along the diameter.

In summary, when a prismatic bar of circular cross-section is subjected to pure torque, all cross-sections remain plane, every cross-section is subjected to the same internal torque, and a diameter of the circular cross-section remains straight. These characteristics are fundamental to the behavior of prismatic bars under torsional loading.

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The strain that can be expressed in polar coordinates is the radial strain, ε rr

Radial strain is a type of deformation or strain that occurs in a material when it is subjected to a load or stress that causes it to change shape.

It specifically refers to the change in dimensions of a material in the radial direction, perpendicular to the axis or center of the object.

When a material is subjected to radial stress or compression, it tends to deform by contracting or expanding in the radial direction.

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Answer:

One of the more important properties of sound is that its speed is nearly independent of frequency. ... Therefore, the relationship between f and λ is inverse: The higher the frequency, the shorter the wavelength of a sound wave. The speed of sound can change when sound travels from one medium to another.

It will take the box 0.96275 sec of releasing before hitting the bullet to come at rest at the top of the building.

Let's in the down direction as negative and an upward direction as positive.

m = mass of the bullet  = 0.00720 kg

M = mass of the wooden block = 2.23 kg

u = velocity of the bullet before striking the block = 601 ms⁻¹

V= velocity of the wooden block before the collision

Vc= velocity of the wooden block + bullet after collision = V

Using conservation of momentum

mu - MV = (m+M)V

(0.00720)(601) - 2.23 = (0.00720 + 2.75)*V

V = 2.0972/2.2228

V = 0.9435 ms⁻¹

Consider the motion of the wooden block in free-fall after being dropped:

V0 = Initial velocity of the wooden block = 0 ms⁻¹

a = acceleration of the wooden block = - 9.8 ms⁻²

t= time of travel

Vf= Final velocity of the wooden block = - 0.9.435 ms⁻¹

On the basis of the above set of data, we can use the kinematics equation

Vf = vo +at

-0.9435 = 0+ (-9.8)t

t = 0.96275

t = 0.96275 sec

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Specific heat capacity of solid magnesium is 0.9556 J/g C.

What is specific heat capacity?

When a material's temperature rises by 1 K (or 1 °C), or when its mass increases by 1 kg, the specific heat capacity is defined as the amount of heat (J) absorbed per unit mass (kg). This measurement is expressed as J/(kg K) or J/(kg °C).

According to the given question:

C = Q/m.T

T = T2 - T1 = 38.9 - 24.5 = 14.4 C

C = 11.7/(161 x 14.4) = 0.9556 J/g C

Specific heat capacity of solid magnesium is 0.9556 J/g C.

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(D) Fungi have one or more nuclei and chromosomes.

Fungi are eukaryotic organisms, and one of their defining characteristics is the presence of one or more nuclei and chromosomes within their cells.

This distinguishes them from prokaryotic organisms, which lack nuclei and chromosomes.

The other statements provided are incorrect, as not all fungi can grow as yeasts and molds, they do possess mitochondria, they are not photosynthetic, and they do have cell membranes.

Thus, the correct option is, (D) Fungi have one or more nuclei and chromosomes.

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Taking into account the definition of speed, you get that the average speed of the entire trip is 53.33 \(\frac{mi}{hr}\) .

It is necessary to know that speed ​​is a quantity that expresses the relationship between the space traveled by an object and the time used for it.

In other words, speed can be defined as the amount of space traveled per unit of time with which a body moves and can be calculated using the expression:

\(speed= \frac{distance traveled}{time}\)

In this case, you know that the shipping mall is 40 miles from the woman's house and that she is going to the mall and back home. So it runs the 40 miles of distance twice. So the distance traveled is 80 miles.

On the other hand, you know that on the trip to the mall she averages 80 \(\frac{mi}{hr}\). Since the woman travels the first 40 miles at that speed, and taking into account the definition of speed, the time it takes to go to the shopping mall is calculated as:

\(80\frac{mi}{hr} = \frac{40 mi}{time}\)

Solving:

time× 80 \(\frac{mi}{hr}\)= 40 mi

\(time = \frac{40 mi}{80\frac{mi}{hr}}\)

time=0.5 hr

Finally, you know that on the return trip she averages just 40 \(\frac{mi}{hr}\). Since the woman travels the second 40 miles at that speed, and taking into account the definition of speed, the time it takes to return to her home is calculated as:

\(40\frac{mi}{hr} = \frac{40 mi}{time}\)

Solving:

time× 40 \(\frac{mi}{hr}\)= 40 mi

\(time = \frac{40 mi}{40\frac{mi}{hr}}\)

time=1 hr

Then, the total time of the trip, which consists of going to the shopping mall and returning home, is calculated as:

total time= 0.5 hr + 1 hr

total time= 1.5 hr

Finally, taking into account the definition of speed, average speed of the trip is calculated as:

\(speed= \frac{80 miles}{1.5 hr}\)

Solving:

speed= 53.33 \(\frac{mi}{hr}\)

In summary, the average speed of the entire trip is 53.33 \(\frac{mi}{hr}\) .

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The statement that holds true is that some of the terms in the Drake Equation depend on sociological factors and cannot be determined solely through astronomy.

The statement that is true about the Drake Equation is that some of the terms depend on sociological factors and therefore cannot be determined through astronomy alone. The Drake Equation is a formula that attempts to estimate the number of active, communicative extraterrestrial civilizations in our galaxy. It consists of several variables representing different factors, such as the rate of star formation, the fraction of stars with planets, the number of planets capable of supporting life, the fraction of life that develops intelligence, and so on.

While astronomical research can provide estimates for many of the terms in the Drake Equation based on scientific observations and data, some terms, particularly those related to the development of intelligent civilizations, involve sociological factors that are beyond the scope of astronomy alone. These factors include the emergence of life, the evolution of intelligence, the development of technology, and the willingness of civilizations to communicate.

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Answer:

The temperature  change in the calorimeter will be lower

Explanation:

Water is an example of a molecular substance. They have relatively low melting points and boiling points usually below 300° C . Water reacts with metals to a degree varying with their position in the electrochemical series.

The specific heat of water is 4179.6 Joules which is relatively high . This typically implies that water absorbs a larger amount of heat but the increase in temperature of its boiling points is relatively low. Thus; in the 200-mm test tube that contains water and was subsequently added to the calorimeter , the heat present was initially absorbed by the water and that does not result to an increase in the temperature change in the calorimeter. Thus the temperature change in the calorimeter will be lower.

The frequency of the electromagnetic wave with a wavelength of 3.40 x \(10^{-6}\) meters is approximately 8.82 x \(10^{13}\) Hz.

The wavelength of the electromagnetic  surge in the presented situation is3.40 x\(10^{-6}\) metres. We may  cipher the  frequence by  fitting  this number into the equation f =  c/. It's 8.82 x 1013 Hz. This indicates that the electromagnetic  surge with a wavelength of3.40 x \(10^{-6}\) metres has a terahertz  frequence.  

Electromagnetic  swells of  colorful wavelengths and  frequentness have different  rates and are employed for a variety of purposes. Radio  swells, for  illustration, have long wavelengths and low  frequentness, making them ideal for carrying data across large distances. X-rays, on the other hand, have short wavelengths and high  frequentness that enable them to access accoutrements  and  give detailed  filmland of the  mortal body.

f = c / λ

f = 3.00 x \(10^{8}\) m/s / 3.40 x \(10^{-6}\) m

f = 8.82 x\(10^{13}\) Hz

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Answer:

v = 10 m/s

Explanation:

We have,

Our initial velocity is 20 m/s

Our acceleration, \(a=-5\ m/s^2\)

It is required to find the velocity after 2 seconds. It is a concept based on equation of kinematics. Using first equation:

\(v=u+at\)

Plugging all the known values

\(v=20+(-5)(2)\\\\v=10\ m/s\)

So, our final velocity is 10 m/s.

The answer is five dots.

sorry i  meant three dots not five

Answer: Gravity or Air Resistance. As you saw and read on the previous screens, the force of gravity causes an object to accelerate toward the ground. However, the force of air resistance counteracts gravity and affects how fast an object falls. In this activity, you will compare the forces of gravity and air resistance.

Explanation: