today, astronomers find compelling evidence that the energy source of the quasars and active galaxies is:_____.

Answer:

22j+10

Explanation:

that is it in a verbal expression

Answer:

The comparison of unknown quantity with known quantity is called measurement.

Answer:

100kg

Explanation:

Momentum is defined as the product of mass times velocity:

\(p=mv\)

The total momentum M must be equal to the sum of momentums of the system components, in this case the momentum of the lady plus the momentum of the cart:

\(M=m_{woman}v_{woman}+m_{cart}v_{cart}\)

since both the woman and the shopping cart have the same velocity:

\(v_{woman}=v_{cart}=v\)

the equation becomes:

\(M=m_{woman}v+m_{cart}v\\M=v(m_{woman}+m_{cart})\)

and since we need the mass of the cart we solve for \(m{cart}\):

\(m_{woman}+m_{cart}=\frac{M}{v} \\\\m_{cart}=\frac{M}{v} -m_{woman}\)

the values given by the problem are the following:

total momentum: \(M=450kgm/s\)

mass of the woman: \(m_{woman}=50kg\)

velocity: \(v=3m/s\)

we substitute all of them in the equation to find the mass of the shopping cart:

\(m_{cart}=\frac{450kgm/s}{3m/s} -50kg\\\\m_{cart}=150kg-50kg\\\\m_{cart}=100kg\)

the mass of the cart is 100kg.

Answer:

Explanation:Concave mirror​s can make a real image.when the object is away from the mirror it is called real image and when the object is closer to the mirror it is called virtual mirror.

To determine the angle at which the ball was thrown, we can use the equations of projectile motion.

Vertical component: v_y = v * sin(θ)

Horizontal component: v_x = v * cos(θ)

Δy = v_y * t + (1/2) * g * t^2

Since the ball reaches a maximum height, Δy = 3.0 m, and the acceleration due to gravity is approximately 9.8 m/s^2, we can rearrange the equation to solve for time (t):

3.0 = 0 * t + (1/2) * 9.8 * t^2

t ≈ √0.6122

t ≈ 0.7837 s

Now that we have the time taken to reach the maximum height, we can calculate the vertical component of the initial velocity:

v_y = v * sin(θ)

0 = 10 * sin(θ)

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Answer:

To solve this problem, we can use the formula for the potential energy stored in a stretched spring or rubber band: U = (1/2) k x^2

where U is the potential energy, k is the spring constant, and x is the amount of stretch.

We can rearrange this formula to solve for k: k = 2 U / x^2

The velocity of the pebble can be found using conservation of energy:

(1/2) m v^2 = U

where m is the mass of the pebble and v is its velocity.

Rearranging this formula, we get: v = sqrt(2 U / m)

We can combine these formulas to solve for the length of the rubber band:

k = (4 U) / (0.25 L^2)

v = sqrt((8 U) / (0.006))

where L is the original length of the rubber band.

Since the width and thickness of the rubber band are given, we can calculate its cross-sectional area:

A = (9 mm) x (1.55 mm) = 13.95 mm^2 = 1.395 x 10^-5 m^2

Using the Young's modulus given in the problem, we can calculate the spring constant: k = (A / L) x (Y / 4)

where Y is the Young's modulus.

The formula for k above, we get: (4 A Y / L^3) x (U / 0.25) = 0.006 v^2

Solving for L, we get: L = (4 A Y U / 0.006 v^2)^1/3

Substituting the given values and solving, we get: L = 34.86 cm

Therefore, the length of the rubber band should be approximately 34.86 cm to achieve the desired velocity of the pebble

When the blinking light sources  moves relative to us, the speed of light remains constant but frequency of blinks can change.

Frequency of a light wave is the number of wave cycles obtained per unit time. Thus it is inverse of the time and has the unit of s⁻¹ which is equivalent  to 1 hertz, Hz.

The speed of light is constant at any direction or for any distance and it is equal to the value 3 × 10⁸. This constancy of light is introduced from the theory of special relativity.

When the light source moves closer to the observer, the number of wave cycles catches by the observer increases thereby the frequency. Therefore when the blinking light moves closer to us, its frequency changes but speed remains constant.

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1) both lights will blink at the same time every 20 seconds

2)Both lights will blink at the same time every 36 seconds

3) 2 lights will blink together is that you must find the least common factor (LCM) of both numbers and when both hit the same number then that is when both lights blink at the same time.

When a blinking light source moves relative to you, the speed of the light remains constant but the frequency of blinks can change. stays the same, as does the blinking frequency. changes but the frequency of blinks remains constant.

For example, for number 1 we have 4 and 5 seconds when the lights blink

4: 4, 8, 12, 16, 20...

5: 5, 10, 15, 20...

we see that the LCM factor is 20 and that is when both lights will hit at the same time.

Therefore, 1) both lights will blink at the same time every 20 seconds

2)Both lights will blink at the same time every 36 seconds

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Therefore, based on the estimated duration of a galactic year, Earth has been around for approximately 18.4 to 20.4 galactic ye

A "galactic year" refers to the time it takes for our solar system to complete one orbit around the Milky Way galaxy. The exact duration of a galactic year is not precisely determined due to various factors, such as the varying speeds of stars within the galaxy. However, it is estimated to be roughly 225-250 million years.

To calculate the number of galactic years Earth has been around based on the age of the solar system (4.6 billion years), we can divide the age of the solar system by the estimated duration of a galactic year:

Number of Galactic Years = Age of the Solar System ÷ Duration of a Galactic Year

Number of Galactic Years = 4.6 billion years ÷ 225-250 million years

Number of Galactic Years ≈ 18.4 to 20.4 galactic years

Therefore, based on the estimated duration of a galactic year, Earth has been around for approximately 18.4 to 20.4 galactic years.

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The best statement that explains why different areas of the Earth have different amounts of heat energy is that "Earth receives different amount of solar energy in different regions " .

In the question ,

it is given that ,

Global climate & weather patterns are driven by differences in amount of heat energy in different areas of Earth .

we have to find the true statement for the given cause .

we know that ;

Different parts in the  Earth surface receive different amounts of sunlight . The Sun rays strike the Earth surface most directly at Equator.

that means Near the poles, the Sun rays strike surface at a slant due to which the rays spread over wide area.

The more focused rays are, more energy the area receives, and it will be more warmer .

Therefore , the correct statement to explain given reason is "Earth receives different amount of solar energy in different regions " .

The given question is incomplete , the complete question is

Global climate and weather patterns are driven by differences in the amount of heat energy in different areas of the Earth. Which statement best explains why different areas of the Earth have different amounts of heat energy ?

(a) The solar radiation from the Sun is equally distributed across the Earth at all times.

(b) The gravitational energy from the Sun varies greatly in different regions of the Earth.

(c) The Earth spins at different rates so the rotational energy of the Earth varies.

(d) The Earth receives different amounts of solar energy in different regions

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The net work that has been done is obtained as  5.02 * 10^4J. Option B

We have to note that the work that is done is defined as the product of the force that has been applied and the acceleration of the object. In this case ,we can see that there is work that has been done as the velolcity of the object is changed.

Hence;

Work done = 1/2mΔv^2

m = mass of the object

v = velocity of the object

Thus;

Work done = 0.5 * 5020 * (21 - 41)^2

Work done =  5.02 * 10^4J

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Answer:

Explanation:

The power of the crane can be found by using the formula

\( p = \frac{ \orange{w}}{ \orange{t}} \\ \)

w is the workdone

t is the time taken

From the question we have

\(p = \frac{5600}{2.8} \\ \)

We have the final answer as

Hope this helps you

In order to compare the numbers, let's put all of them into the decimal form:

We can see that the greater one is 26.8 (all other numbers are close to 2, and this one is close to 27).

The numbers in decrescent order are:

26.8, 271%, 2.62, 2 2/5, 2.26.

Answer:

26.8

Explanation:

2.26 < 2.4 < 2.62 < 271/100 = 2.71 < 26.8

The total power consumed by the circuit is 410 watts

Power can be described as the rate at which work is carried out in a body. It can also be described as the movement or transfer of energy from one form to another.

From the question stated above, the total power can be calculated as follows:

P1 + P2 + P3

= 100 + 250 + 60

= 410

Hence the total power in the circuit is 410 watts

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Answer:

Planck postulates that the energy exchanges between matter and radiation do not take place in continuous manner but by discrete and indivisible quantities or quanta of energy. He then shows that the quantum of energy must be proportional to the frequency ν of the radiation. (1.1) where h is known as the Planck’s constant.

Explanation:

Answer:

Technology is the application of scientific knowledge to the practical aims of human life or, as it is sometimes phrased, to the change and manipulation of the human environment.

Please Mark it as brainlist answer.

The magnitude of impulse on Ball A will become twice (doubles). Hence, option (c) is correct.

Impulse:

The effect of applied force acting for a very small interval of time is known as Impulse.

Given data:

The initial magnitude of the force on Ball A is, F = 50 N.

The time interval for the applied force on Ball A is, t = 1.25 s.

And the impulse at initial on ball A is, I = 62.5 N-s.

Now, if force on ball A doubles, which means new magnitude of force is,

F' = 2F

F' = 2 × 50

F' = 100 N

For same time interval, the new impulse on Ball A is given as,

I' = F' × t

Solving as,

I' = 100 × 1.25

I' = 125 N-s

Taking the ratio of both the impulses as,

I' / I = 125/62.5

I' = 2 I

Thus, we can conclude that the magnitude of impulse on Ball A will become twice (doubles). Hence, option (c) is correct.

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Answer:

C. It doubles.

Explanation:

hope this helps:)

The kinetic energy of the ball is 450 J.

We have to note that the kinetic energy that the body has is the energy that the body has due to the fact that the body is in motion. This is why the object that undergoing kinetic energy must have a velocity of the object.

We have to note that the kinetic energy can be given using the formula;

KE = 0.5mv^2

KE = kinetic energy

m = mass of the object

v = velocity of the object'

Then we have;

KE = 0.5 * 4 * 15^2

KE = 450 J

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Answer:

That is not true all objects fall at the same speed excepts things like feathers or paper.

Answer: false

Explanation: apex

The Point on the x-axis that the net forces from the other two charges acting on a third charge, q°, will be equal to zero is

x=1.72units

This is further explained below.

Generally, The total amount of forces exerted on an item is referred to as its net force. The total of N forces exerted on an item is given in the equation below.

The total force operating on an item, which may include a number of different forces, is known as the net force acting on the object.

The n forces operating on an item are added up in this equation. According to this formula, the amount of net force exerted on an item is equal to the mass times the acceleration of the object.

+3q  <------>+11q

\(&\frac{1}{4 \pi E v}\left(\frac{3 q}{x^2}-\frac{11 q}{(5-x)^2}\right)=0 \\\\&\frac{3}{x^2}=\frac{11 q}{(5-x)^2} \\&\frac{5-x}{x}=\sqrt{\frac{11}{3}}=1.91 \\\\\)

5-x=1.91 x

=1.715

=1.72units

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Answer:

La materia es la sustancia de la que está hecho todo material. En física, el sistema es una de las propiedades de la materia. Se puede transferir entre objetos y convertir en forma. No se puede crear ni destruir.

espero que te ayude!

Answer:

Explanation:

To find the distance covered by the dolphin , we use the formula

From the question

velocity = 17 m/s

time = 3600 s

We have

distance = 17 × 3600

We have the final answer as

Hope this helps you

The Sun is approximately 3/4 of the way through its lifetime.

The Sun is a main-sequence star, meaning it is in the middle stage of its life cycle. Stars like the Sun undergo nuclear fusion, where hydrogen atoms fuse to form helium and release energy. This fusion process provides the Sun with the energy to shine.

Based on current scientific understanding, the Sun is estimated to have a total lifetime of about 10 billion years. It is currently around 4.6 billion years old, which means it has already passed the quarter mark of its lifetime.

As the Sun continues to burn hydrogen in its core, it will gradually undergo changes. Over time, it will exhaust its hydrogen fuel and start to expand into a red giant, eventually shedding its outer layers and forming a white dwarf.

Therefore, considering the Sun's age and estimated total lifetime, it is believed to be approximately 3/4 of the way through its life. However, it's important to note that estimating the exact lifespan of a star is complex, and our understanding may evolve with further research.

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The Sun is approximately 3/4 of the way through its lifetime.The Sun is a main-sequence star, meaning it is in the middle stage of its life cycle. Stars like the Sun undergo nuclear fusion, where hydrogen atoms fuse to form helium and release energy. This fusion process provides the Sun with the energy to shine.

Based on current scientific understanding, the Sun is estimated to have a total lifetime of about 10 billion years. It is currently around 4.6 billion years old, which means it has already passed the quarter mark of its lifetime.

As the Sun continues to burn hydrogen in its core, it will gradually undergo changes. Over time, it will exhaust its hydrogen fuel and start to expand into a red giant, eventually shedding its outer layers and forming a white dwarf.  

Therefore, considering the Sun's age and estimated total lifetime, it is believed to be approximately 3/4 of the way through its life. However, it's important to note that estimating the exact lifespan of a star is complex, and our understanding may evolve with further research.

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All of the following (radio waves, visible light, x-rays, and infrared light) travel at the speed of light, which is 299,792,458 meters per second. Therefore, none of them travel at the same speed.

Electromagnetic waves are a type of energy wave that consists of oscillating electric and magnetic fields, which propagate through space at the speed of light. They are created by the motion of charged particles, and they can travel through a vacuum or through various materials.

All of the options listed, including radio waves, visible light, X-rays, and infrared light, travel at the same speed, which is the speed of light in a vacuum and all of them are electromagnetic waves. This speed is approximately 299,792,458 meters per second (or about 186,282 miles per second).

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Answer: Conduction occurs more readily in solids and liquids, where the particles are closer to together, than in gases, where particles are further apart.

Answer:

conduction occurs when gas becomes liquid.

The height of the cannon before it is launched, at t=0, is 58 m.

The equation of motion of the cannon ball is given as;

h(t) = -4.9t² + 19.8t + 58

The initial height of the cannon before it was launched is calculated as follows;

h(0) = -4.9(0) + 19.8(0) + 58

h(0) = 58 m

Thus, the height of the cannon before it is launched, at t=0, is 58 m.

Complete question is below:

The equation that models the path of a cannon ball is  h(t) = -4.9t² + 19.8t + 58. What is the height of the cannon before it is launched, at t=0? Remember to include units.

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Answer:

30Kg

Explanation:

Weight = mass x gravitational field strength

300 = mass x 10

mass = 30kg

gravitational field strength is 9.8 on earth but normally we take it to be 10 for easy reference and calculations

The mass will be "30 kg". A further solution is provided below.

According to the question,

Weight,

We know that,

Gravitational field strength,

The mass will be:

→ \(Weight = Mass\times Gravitational \ field \ strength\)

or,

→ \(Mass = \frac{Weight}{Gravitational \ field \ strength}\)

By putting the values, we get

→           \(= \frac{300}{10}\)    

→           \(= 30 \ kg\)

Thus the above solution is right.

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Therefore, the force exerted by the weed on the tool is 5 Newtons.

When an engine exerts itself, torque, which is a twisting force, speaks to the rotational force of the engine and quantifies how much of that twisting force is accessible. Everyday activities like turning a doorknob, opening a drink bottle, using a tool, or peddling a bicycle all involve torque.

To find the force exerted by the weed on the tool, we can use the formula:

Torque = Force × Lever Arm

Given that the torque is 1.11 nm and the lever arm is 0.22 m, we can rearrange the formula to solve for the force:

Force = Torque / Lever Arm

Converting the lever arm from centimeters to meters, we have:

Force = 1.11 nm / 0.22 m

= 5 N

Therefore, the force exerted by the weed on the tool is 5 Newtons.

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Answer:

Approximately \(69\; {\rm N}\) at approximately \(126^{\circ}\).

Explanation:

Assume that both angles in the question are relative to the positive \(x\)-axis (towards the positive horizontal direction.)

Horizontal component (\(x\)-component) of the two forces would be:

Note that the \(x\)-component of the \(90\; {\rm N}\) force is negative since this components points away from the positive \(x\!\)-direction.

Hence, the net force in the \(x\)-component would be:

\((50\; {\rm N}) \, \cos(30^{\circ}) + (90\; {\rm N}) \, \cos(160^{\circ}) \approx (-41.3) \; {\rm N}\).

(Again, this component is negative since it points away from the positive \(x\)-axis.)

Similarly, the vertical component (\(y\)-component) of the two forces would be:

Hence, the net force in the \(y\)-component would be:

\((50\; {\rm N}) \, \sin(30^{\circ}) + (90\; {\rm N}) \, \sin(160^{\circ}) \approx 55.8\; {\rm N}\).

Refer to the diagram attached. The resultant net force is the vector sum of the components. Apply the Pythagorean Theorem to find this net force:

\(\begin{aligned}(\text{net force}) &= \sqrt{(\text{$x$-component})^{2} + (\text{$y$-component})^{2}} \\ &\approx \sqrt{(-41.3)^{2} + (55.8)^{2})}\; {\rm N} \\ &\approx 69\; {\rm N}\end{aligned}\).

Find the angle of this net force relative to the positive \(x\)-axis using the inverse cosine function \(\arccos\):

\(\begin{aligned}\arccos\left(\frac{(\text{$y$-component})}{(\text{net force})}\right) &\approx \arccos\left(\frac{55.8\; {\rm N}}{69\; {\rm N}}\right) \\ &\approx 126^{\circ}\end{aligned}\).

(The units might need to be converted into degrees.)

Answer:

Energy is: the ability to do work

The formula for energy is: power x time = energy

Explanation:

Hope this helps (there isn't really an explanation)

The time taken by the runner to do the work is 1.42 seconds.

Given the data in the question;

Power can be simply referred to as the quantity of energy transferred per unit time.

It is expressed as;

\(P = \frac{W}{t}\)

Where W is work done and t is time elapsed.

To determine the time it took the runner to do the work, we substitute our given values into the expression above.

\(P = \frac{W}{t} \\\\t = \frac{W}{P} \\\\t = \frac{457J}{321W} \\\\t = \frac{457 kgm^2/s^2}{321 kgm^2/s^3}\\\\t = 1.42s\)

Therefore, the time taken by the runner to do the work is 1.42 seconds.

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