A 10,000-watt radio station transmits at 535 kHz.


Calculate the energy of a single photon at the transmitted frequency.


A)3.55 × 10-28 J/photon

B)3.55 × 10-31 J/photon

C)6.63 × 10-30 J/photon

Answers

Answer 1
Answer: A

Explanation: E=hv, E-energy, h-Planck constant, v-frequency
E=6.63×10^(-34)*535*10^3=3.55*10^(-28) (J) Photon energydoesn't depend on the power of radio station
Answer 2

The energy of a single photon at the transmitted frequency is

A)3.55 × 10^(-28)J/photon

What is the energy of a single photon?

Energy of photon can be rewritten as

E=hv,

Where, h is planck's constant  

λ is the wavelength of photon  

Where f is the frequency of photon  

Thus, the energy of a single photon at the transmitted frequency obtained by using the formula, Energy (E) is equal to Planck's constant (h) times the frequency.

E=6.63×10^(-34)× 535×10^3

E =3.55 × 10^(-28) (J)

Photon energy doesn't depend on the power of radio station

Learn more about the Energy here;

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Related Questions

What is the net force if you pull a cart to the right with 5N of
force and a friend pushes the left to the left with 5 N of force

Answers

Answer:

In this case the net force is zero.

According to Newton's third law of motion: For every action, there is an equal and opposite reaction. In this case the net force is zero.

Explanation:

Hope this helps!! :)

!Necesito ayuda:Un movil parte del reposo y en 5seg adquiere una rapidez de 12m/seg.Calcular la distancia recorrida.

Answers

Answer:

Distancia = 60 metros

Explanation:

Dados los siguientes datos;

Velocidad inicial = 0 m/s (ya que comienza desde el reposo)

Velocidad final = 12 m/s

Por lo tanto, velocidad total = velocidad inicial + velocidad final

Velocidad total = 0 + 12 = 12 m/s

Tiempo = 5 segundos

Para encontrar la distancia recorrida;

Distancia = velocidad total * tiempo

Sustituyendo en la fórmula, tenemos;

Distancia = 12 * 5

Distancia = 60 metros

Select the correct answer. The Cretaceous-Paleogene was a mass extinction event in which nearly every single large, land-dwelling dinosaur went extinct. Which of the following did not result from this extinction event? A. Diverse species of animals began to evolve. B. Meteorites struck the region that Mexico now occupies. C. Clouds of dust and gas billowed into Earth’s atmosphere. D. Ecological niches were left empty but with the potential to be filled.

Answers

Answer:

d

Explanation:

because

Answer:

the answer is B. Meteorites struck the region that Mexico now occupies.

Explanation:

i got it right on plato

potential energy question

Answers

Answer:

closer together

Explanation:

hope i hv answered ur question

Iron ball sinks in water but not in mercury. Why?

Answers

Answer:

mercury is more dense

Explanation:

Explanation:

Iron ball sinks in water but not in mercury because of the difference in the density iron used in iron ball. The iron ball has more density than water and less than the mercury.

Hence, Iron ball sinks in water but not in mercury.

-TheUnknownScientist

Figure 3.50 shows a wooden cube floating in water.
When a stone is placed on the wood, it sinks a further 0.2m.
Find the weight of the
(a) wood
(b) stone
(Density of water = 1000kgm^-3]​

Answers

Answer:

(a) The weight of the wood is approximately 5,886 N

(b) The weight of the stone is approximately 1,962 N

Explanation:

The given parameters are;

The base area of the wood, A = 1 m × 1 m = 1 m²

The depth to which the wood is submerged below the water, d = 0.6 m

The depth further the wood sinks when a stone is placed on the wood, Δd = 0.2 m

The density of water, ρ = 1,000 kg/m³

(a) Archimedes' principle states that the up-thrust, or upward force acting on an object submerged in a fluid, is equal to the weight of the displaced fluid.

For a floating object such as the wood, the up-thrust is equal to the weight of the object

The weight of the water displaced, W = The volume of the displaced water, V × The density of the water, ρ × The acceleration due to gravity, g

W = V × ρ × g

'V' is the same as the volume of the submerged wood, therefore;

V = A × d = 1 m × 1 m × 0.6 m = 0.6 m³

g ≈ 9.81 m/s²

Therefore;

W = 0.6 m³ × 1,000 kg/m³ × 9.81 m/s² ≈ 5,886 Newtons

The weight of the water displaced, W ≈ 5,886 N = The up-thrust = The weight of the wood

∴ The weight of the wood, W ≈ 5,886 N

(b) Similarly, the weight of the stone, [tex]W_{stone}[/tex] is equal to the weight of the additional volume of water displaced

∴ [tex]W_{stone}[/tex] = A × Δd × ρ × g

By plugging in the values, we get

[tex]W_{stone}[/tex] ≈ 1 m² × 0.2 m × 1,000 kg/m³ × 9.81 m/s² = 1,962 N

The weight of the stone, [tex]W_{stone}[/tex] ≈ 1,962 Newtons

How tightly packed molecules (particles) are packed in a solid, liquid or gas is the
weight
volume
density

Answers

Answer:

I believe it's the weight

Explanation:

I believe it’s the density
Please give me Brainliest

A horizontal platform in the shape of a circular disk rotates on a frictionless bearing about a vertical axle through the center of the disk. The platform has a mass of 150 kg, a radius of 2.0 m, and a rotational inertia of 300 kg·m2 about the axis of rotation. A 60 kg student walks slowly from the rim of the platform toward the center. If the angular speed of the system is 1.4 rad/s when the student starts at the rim, what is the angular speed when she is 0.70 m from the center?

Answers

Answer: [tex]2.29\ rad/s[/tex]

Explanation:

Given

Mass of Platform M=150 kg

the radius of Platform R=2 m

Moment of inertia of Platform [tex]I=300\ kg.m^2[/tex]

Mass of student [tex]m=60\ kg[/tex]

The initial angular speed of the student is [tex]\omega _1=1.4\ rad/s[/tex]

Initially, the moment of inertia of platform and student is

[tex]I_1=\dfrac{1}{2}MR^2+mR^2\\\\I_1=300+60\times 4=540\ kg.m^2[/tex]

The final moment of inertia

[tex]I_2=\dfrac{1}{2}MR^2+mr^2\\\\I_2=300+60\times 0.7^2=329.4\ kg.m^2[/tex]

Conserving angular momentum

[tex]I_1\omega_1=I_2\omega _2\\\\540\times 1.4=329.4\times \omega_2\\\\\omega_2=\dfrac{756}{329.4}=2.29\ rad/s[/tex]

clarify this statement acceleration due to gravity of the Earth is 9.8m/s square​

Answers

Answer:

it means that velocity of a body rises by 9.8m/s each second if the air resistance is nrelated

mark me

Which of the following best describes the term thermal energy? Choose one: A. The energy of an object in motion due to its mass B. The kinetic energy of atoms, ions, and molecules C. The energy stored in an object because of its position D. The energy a particle has because of its charge and its position relative to another particle Part 2 (0.5 point)See Hint Which of the following best describes the term electrostatic potential energy?

Answers

Answer:

The correct option is (d).

Explanation:

The energy a particle has because of its charge and its position relative to another particle is called thermal energy. It is the energy that comes from heat. This is generated by the movement of the particles in an object.Thermal energy is the energy an object or system has due to the movement of particles within.

Hence, the correct option is (d).

The thermal energy is related to the kinetic energy of atoms, ions, and molecules.

What is thermal energy?

The thermal energy of any material is defines as the increase in the internal energy of the material.

When ever heat is given to the material, the atoms and the molecules in the material gains energy and moves with a kinetic energy.

The increase in kinetic energy allows the atoms and the molecules to move with higher velocities in the material, and they collide with each other, thus the temperature of the material increases.

Thus the thermal energy is related to the kinetic energy of atoms, ions, and molecules.

To know more about Thermal energy follow

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A 20 g block of ice is cooled to −65 ◦C. It

is added to 570 g of water in an 76 g copper

calorimeter at a temperature of 26◦C.

Find the final temperature. The specific

heat of copper is 387 J/kg ·

◦C and of ice is

2090 J/kg ·

◦C . The latent heat of fusion of

water is 3.33 × 10^5

J/kg and its specific heat

is 4186 J/kg ·

◦C .

Answer in units of ◦C.

Answers

Answer:

The final temperature is approximately 23.55°C

Explanation:

The given parameters are;

The mass of the ice block, m₁ = 20 g

The initial temperature of the block, T₁ = -65°C

The mass of the water to which the block is added, m₂ = 570 g

The mass of the copper container containing the water, m₃ = 76 g

The initial temperature of the water and the copper, T₂ = 26°C

The specific heat capacity of copper, c₃ = 387 J/(kg·°C)

The specific heat capacity of ice, c₄ = 2,090 J/(kg·°C)

The latent heat of fusion of ice, l = 3.33 × 10⁵ J/kg

The specific heat capacity of water, c₁ = 4,186 J/(kg·°C)

We have;

ΔQ = m₁·c₁·ΔT + m₁·l = m₂·c₂·ΔT + m₃·c₃·ΔT

Therefore, we get;

20 × 2,090 × -65 +  20 × 3.33 × 10⁵ + 20 × T × 4,186  = 570 × 4,186 × (26 - T) + 76 × 387 × (26 - T)

Using a graphing calculator, we get;

83720·T + 3943000 = 62801232 - 2415432·T

The final temperature, T ≈ 23.55 °C

What is addictive about vaping?

Answers

Answer:
The last one, nicotine from tobacco

Answer:

nicotine obviously

Explanation:

Two coins lie 1.5 meters apart on a table. They carry identical electric charges. Approximately how
large is the charge on each coin if each coin experiences a force of 2.0 N

Answers

I don’t have any of the problem I can get it to my computer for my work

The charge on each coin is equal to [tex]2.50 \times 10^{-10}\;Coulomb[/tex]

Given the following data:

Force = 2.0 NewtonRadius = 1.5 meters

To determine the charge on each coin, we would apply the law of electrostatic forces:

Mathematically, the law of electrostatic forces is given by the formula:

[tex]F = \frac{kq_1q_2}{r^2}[/tex]

Note: [tex]q_1 = q_2[/tex] (since the coin carry identical electric charges).

Therefore, the formula becomes:

[tex]F = \frac{k(2q)}{r^2}[/tex]

Making q the subject of formula, we have:

[tex]q=\frac{Fr^2}{2k}[/tex]

Substituting the given parameters into the formula, we have;

[tex]q=\frac{2 \times 1.5^2}{2 \times 8.99 \times 10^9}\\\\q=\frac{2 \times 2.25}{2 \times 8.99 \times 10^9}\\\\q=\frac{4.5}{17.98 \times 10^9}\\\\q=2.50 \times 10^{-10}\;Coulomb[/tex]

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PLEASE ANSWER THIS ASAP I WILL MARK YOU THE BRAINLIEST The actual subject is Science but they dont have that as a option in pick a subject

Answers

Not any one of them but the approximate value is 0.075 km/min


Explain why "selectively permeable" is a good way to describe a cel
membrane.​

Answers

[tex] \huge \mathsf \blue{Question}[/tex]

Explain why "selectively permeable" is a good way to describe a cell membrane.

[tex] \huge \mathsf \blue {Answer}[/tex]

The plasma membrane is called a selectively permeable membrane as it permits the movement of only certain molecules in and out of the cells. Not all molecules are free to diffuse. If plasma membrane ruptures or breaks down then molecules of some substances will freely move in and out of the cells.

As the plasma membrane acts as a mechanical barrier, the exchange of material from its surroundings through osmosis or diffusion in a cell won’t take place. Consequently, the cell would die due to the disappearance of the protoplasmic material. It allows hydrophobic molecules and small polar molecules diffuse through the lipid layer, but does not allow ions and large polar molecules cannot diffuse through the membrane.

7. Thermal energy depends upon the______ and _____ of an object?

Answers

:

Please give me brainly,

The thermal energy of an object depends on three things: 4 the number of molecules in the object 4 the temperature of the object (average molecular motion) 4 the arrangement of the object's molecules (states of matter). The more molecules an object has at a given temperature, the more thermal energy it has.

Mass and Temperarture

I am pretty sure that is right if Not sorry

Have a great day.

An object has an angular velocity of 1.0 rad and an angular acceleration of 0.5 rad/s. Is the speed of its rotation increasing or decreasing?

Answers

Answer:

increasing

Explanation:

Given that,

Initial angular speed =1 rad/s

Angular acceleration = 0.5 rad/s²

We know that the angular acceleration is given by :

[tex]\alpha =\dfrac{\omega_f-\omega_i}{t}[/tex]

Where

[tex]\omega_f[/tex]city and t is time is the final angualr velo

As the angular acceleration of the object is positive. It means that the final speed of the object is more than that initial. As a result, the speed of its rotation is increasing.

How does the mass of a satellite, moon or asteroid affect its orbital speed?

Answers

It would be B, the greater the mass, the more fast the orbiting object will move

At am outdoor market, a bunch of bananas is set into oscillatory motion with an amplitude of 29.8981 cm on spring with a spring constant

Answers

Answer:

Hello your question lacks some very vital information hence I will give you a general equation where you can input the missing values and get your answer

answer :  mass of Bananas ( m ) = [tex]\frac{A^2}{V^2} * K[/tex]

To calculate for weight of Bananas  = m * g      where g = 9.8

Explanation:

Given an amplitude ( A )= 29.8981

Spring constant = x ( unknown )

maximum speed of Bananas( v ) = wA  ( unknown )

question : calculate the weight of the bananas

First  step : calculate the period of oscillation

T = [tex]\frac{2\pi }{vA}[/tex] --- ( 1 )

next step : express T in terms of mass ( m ) of the bananas

= [tex]2\pi \sqrt{\frac{m}{k} } = \frac{2\pi }{vA}[/tex]

∴ m/k = A^2 / v^2

hence  mass of Bananas ( m ) = [tex]\frac{A^2}{V^2} * K[/tex]

To calculate for weight = m * g

A baseball sits motionless near first base on a baseball diamond. What statement best explains why the baseball remains motionless?

Answers

Answer:

Explanation:

Newton's first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. This postulate is known as the law of inertia.

hope this helps :))

There is no force acting on the baseball the statement best explains why the baseball remains motionless.

What is inertia?

A body wants to remain in its original position until or unless the external force is not applied to it. Such a phenomenon is known as inertia.

Newton's first law asserts that if a body is at rest or traveling at a uniform speed in a straight direction,

It will remain at rest or continue to move in a straight path at a constant speed until acted on by a force. This is referred to as the law of inertia.

There is no force acting on the baseball the statement best explains why the baseball remains motionless.

Hence option B is correct.

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1.Wave motion that is parallel to the wave direction is described 

as_____________ wave.

2. The time to make one complete cycle is _____________.

3. The distance between successive crests of a wave is __________.

4. Wave motion that is perpendicular to wave direction describes a

       _____________ wave.

5. The number of waves that passes a given point in time is__________.

6. ____________ is a kind of wave that does not need a medium.

7. The highest point of a wave is called ___________.

8. The unit for frequency is ____________.

9. The part of a longitudinal wave where there are fewer particles is     

    called______________.

10. A region in a medium of longitudinal wave where molecules are 

      packed is called _____________.​

Answers

Answer:

Explanation:

A wave is a phenomenon that travels through a material medium without any permanent effect on the medium. It can be classified as mechanical or electromagnetic waves. And the two major types are transverse and longitudinal.

From the given question;

1. Longitudinal waves e.g sound waves, waves in a spring'

2. Frequency (number of cycles per second).

3. Wavelength of the wave. Measured in meters.

4. Transverse waves e.g light waves, water waves.

5. Wave speed.

6. Electromagnetic waves e.g ultraviolet waves, X-rays etc.

7. Amplitude.

8. Hertz.

9. Rarefaction

10. Compression

A wave is a phenomena that flows across a material medium without leaving any lasting mark.

1.Wave motion that is parallel to the wave direction is described

as longitudinal wave.

What is wave?

A wave is a phenomena that flows across a material medium without leaving any lasting mark. Mechanical or electromagnetic waves can be used to classify it. Transverse and longitudinal are the two main forms.

1.Wave motion that is parallel to the wave direction is described

as longitudinal wave.

2.Frequency is defined as the number of cycles per second.. The time to make one complete cycle is frequency.

3.Wavelength of the wave is measured in meters.The distance between successive crests of a wave is wavelength.

4. Examples of Transverse waves are light waves, water waves.. Wave motion that is perpendicular to wave direction describes transverse wave.

5.The number of waves that passes a given point in time is Wave speed.

6.Examples of Electromagnetic waves are ultraviolet waves, X-rays etc.

Electroimegnetic wave is a kind of wave that does not need a medium.

7.The highest point of a wave is called amplitude.

8.The unit for frequency is Hertz.

9. A region in a medium of longitudinal wave where molecules are Rarefaction.

10.  A region in a medium of longitudinal wave where molecules are

packed is called compression.

To learn more about the wave refer to the link;

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Dones
Which statement best explains the similarity in the arrangement of the bones in these two structures?
O The bones of all animals are similarly arranged
O The bones of animals that take in oxygen are similarly arranged.
O Humans and whales use these structures to perform the same functions.
Humans and whales inherited these structures from a common ancestor.

Answers

The correct answer is the last option- inherited from common ancestor

why doesn't every planet have a moon?​

Answers

Answer:

Up first are Mercury and Venus. Neither of them has a moon. Because Mercury is so close to the Sun and its gravity, it wouldn't be able to hold on to its own moon. Any moon would most likely crash into Mercury or maybe go into orbit around the Sun and eventually get pulled into it.

do opposite poles repel
true or false?

Answers

Answer:

false

Explanation:

like poles repel and opposite poles attract. :)

It's False

Opposite poles attractc each other.

Same poles repels each other.

PLEASE ANSWER THIS ASAP I WILL MARK YOU THE BRAINLIEST The actual subject is Science but they dont have that as a option in pick a subject

Answers

Answer:

I believe it is D.

Explanation:

I say this because it is position vs. seconds and it makes the most sense based on the markings. Sorry if I am wrong, hope it is right!  

Answer: D. 40/15 = 2.67m/s

Explanation:

I hope it is correct

help please:))))))))))))))))))))

Answers

Answer:

a and c

Explanation:

An unnamed professor is walking to class when an office chair (travelling in the same direction) collides with them. The professor fails into the chair and remains in the chair after collision. The professor, with a mass of 113kg, is travelling at 1.56 m/s. The chair has a velocity of 6.5 m/s, and a mass of 10kg. After the collision, and ignoring any effects of professor falling, what would be the speed of the chair professor system

Answers

Answer: 1.96 m/s

Explanation:

Given

Mass of Professor [tex]m_1=113\ kg[/tex]

Velocity of professor [tex]u_1=1.56\ m/s[/tex]

mass of chair [tex]m_2=10\ kg[/tex]

velocity of chair [tex]u_2=6.5\ m/s[/tex]

Suppose  after the collision, v is the common velocity

Conserving momentum

[tex]\Rightarrow m_1u_1+m_2u_2=(m_1+m_2)v\\\\\Rightarrow v=\dfrac{113\times 1.56+10\times 6.5}{113+10}=\dfrac{241.28}{123}\\\\\Rightarrow v=1.96\ m/s[/tex]

What does this list of words mean 1 Collect 2 Badge 3 Shine 4 Trace 5 Pear 6 Window 7 Taken 8 Divide 9 Repeat 10 Entire 11 Tail 12 Harvest

Answers

Answer:

See explanation below

Explanation:

• Collect: Collect is verb that means to gather or bring something from someone or some place. It also means to extract or obtain an item from a place or person.

• Badge: A badge is a symbol of representation. It is either in a metallic or plastic form and it indicates that the bearer belongs to a certain school, organization or movement.

• Shine: Shine is a verb that means to illuminate or give out light. It also means to emit bright light from a source.

•Trace: Trace is verb that means to carefully track or find out something or an information by asking questions and doing research.

•Pear: Pear is an edible fruit that belongs to the rose family. It is usually green and rounded at the bottom while being narrow near its stalk.

• Window: A window is an opening, typically in a house or a vehicle and usually on the wall or roof. It admits air and light and lets people see through.

•Taken : Taken is the past participle of the verb “take” and it means to get a hold of something.

• Divide: Divide is a verb that means to share into differ parts.

• Repeat: Repeat means to do or say something more than once.

• Entire: Entire means “all” or “everything”. It also means “whole and complete” leaving no part out.

• Tail: Tail means the bottom or extreme end of a thing. It also means the hind part of an animal that sticks out close to the anus.

• Harvest: Harvest means to gather crops after they are grown and mature. It is the period of gathering crops in agriculture.

Tyson has been assigned to the offensive line as a left guard on his football team which requires him to make explosive movements and push other players body weight in a specific direction. Which sport skill does he demonstrate as his dominant skill based on this position assignment?

Answers

Answer:

The answer is power.

Explanation:

because in the reading it says it's his dominant skill.

and beacuse i got it right on the test.

Answer:

The answer is power.

Explanation:


State the relationship between the mass of trolley and acceleration of the trolley?

Answers

Answer: The complementary relationship indicated by the Newton's second law...

For a given applied force the acceleration of the trolley is inversely proportional to it's mass.

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PLEASE DONT FAIL ME THIS TIMEwhich information will help you figure out how often your website should be updated a. cost of updates b. time for updates c. visitor frequency d. resources to update it One of the reasons that terrorism is so effective is that it can make everyday objects or common public gatherings dangerous. Which BEST explains why this makes terrorism a difficult social problem to solve?A. It makes it much easier to tell terrorists from average citizens.B. There are few government agencies whose purpose is to fight terrorism.C. The tools of terrorism are very accessible to those who want to do harm.D. Most terrorists do not have any kind of agenda and strike random people. What attractive force pulls electrons toward protons to form chemical bonds?A. Chemical bondingB. Attraction of oppositesC. ElectronegativityD. Ionization energy What provided Philadelphia with a rural atmosphere? To investigate the relationship between the selling price of a house, y , in dollars, and the size of the house x, in square feet, a local builder collected data on a random sample of 120 houses from a certain region. Assume that the conditions for inference for the slope of a regression line are met. The resulting 95 percent confidence interval for the population slope of the regression line relating price and size is given by (62,99). The local builder claims that the selling price of houses from the region increases by $104 for every extra square foot of space in the house. Which of the following best describes the conclusion that can be reached about this claim based on the confidence interval?a. The claim is supported by the interval, since the interval does not contain the value 0. b. The claim is supported by the interval, since all values in the interval are positive. . The claim is supported by the interval, since the interval does not contain the value 104. d. The claim is not supported by the interval, since the interval does not contain the value 0. e. The claim is not supported by the interval, E since the interval does not contain the value 104. It was the result of the night 13th amendment to the U.S. Constitution which was ratified in 1865 plz Answer best one gets brainlyest DIRECTIONS : Rewrite each sentence to create parallelism . A competitive cliff diver jumps intowater 81 feet below. The distance d that the diver fallsin t seconds is given by the equation d = 16t^2. Howlong does it take the diver to hit the water? A small car has a head-on collision with a large truck. Which of the following statements concerning the magnitude of the average force due to the collision is correct? The small car and the truck experience the same average force. The small car experiences the greater average force. The truck experiences the greater average force. It is impossible to tell since the masses are not given. It is impossible to tell since the velocities are not given. 1 points Saved Question 1 of 5 Moving to another question will save this response. What is the effect when the author of Exploring the Titanic describes the night the Titanic sank?The reader understands the authors reasons for wanting to find the Titanic.The reader realizes that the author has regrets about finding the Titanic.A mood of disappointment builds and lasts throughout the rest of the passage.A respectful mood forms alongside the existing general mood of excitement. Expand 68*104......... Three (3) Types of Section Views used in engineering drawing arePlan, Front and EndOrthographic, Isometric and Oblique SectionFull, Half and Offset SectionNone of the above Paragraph FourThe "Little Gator" has experienced just as much success off the racetrack. He was recently presented with the Mullinax Ford Community Hero Award for his community service. When asked what he believes is an important quality to succeed in life, Noah replied, "Helping people out." Despite his busy racing practice and competition schedule, Noah dedicates time to speak with students and make educational and inspirational films. In one film, Noah encourages other kids to dream big and work hard to achieve their dreams. In another film, he talks about the importance of respect. He reminds viewers, "Everyone is unique. We should be kind to everyone. Don't be a bully."Select the sentence that explicitly supports the first sentence of paragraph 4: "The "Little Gator" has experienced just as much success off the racetrack." (5 points) aIn one film, Noah encourages other kids to dream big and work hard to achieve their dreams. bHe was recently presented with the Mullinax Ford Community Hero Award for his community service. cIn another film, he talks about the importance of respect. dHe reminds viewers, "Everyone is unique. We should be kind to everyone. Don't be a bully." 2. What is the evidence that 4- legged animals came from fish?