Eleonora is learning about the nervous system in school. She learns the nervous system is made up of many parts. What is the main purpose of the nervous system in the human body?

A. Releasing hormones to regulate body functions.

B. Circulating oxygen throughout the body.

C. Relating messages between the body and brain.

D. Protecting the body from foreign invaders

its A. water contamination

Over use of pesticides and fertilizers results in contamination of water and air as well as they cause severe health issues when exposed to them. Currently, regulations are controlling the use of these chemicals to reduce water contamination.

Pesticides are chemical compounds used to kill pests. It is important to control the population of pests and insects which badly affects the crops. However pesticides cannot be used in over dosage it will affect the living.

Fertilizers are used to fertilize the soil to help for the growth of crops. They also contains toxic chemicals.

Both fertilizers and pesticides contains hazardous and toxic chemicals. They chemicals definitely  will result in pollution of water and air and causes healthy issues for surrounding organisms.

Water contamination is a serious issues that we are all addressing for long while. Reducing the use of pesticide and fertilizers can decline water pollution up to  an extend. Hence, option A is correct.

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Answer: When you fire a gun from the perspective of newton's third law there is an equal and opposite reaction. This is what makes the bullet go forward and the gun kick back.

Explanation: when you fire a gun you pull the trigger, after you pull the trigger a mechanism in the gun goes forward very quickly to strike the primer on the bullet. The bullet will propel forward causing the gun to go backward into your shoulder.

At the point when you discharge a gun, Newton's third Law of Motion, which expresses that for each activity, there is an equivalent and inverse response.

Answer:

I did my best to research to help you

Explanation:

The answer would be in space because there is no matter and if there isn't matter the sound of a ringing cell phone could not be transmitted.

Explanation:

Thermal energy is defined as the kinetic energy present within the particles of a substance.

A process in which energy is absorbed by the molecules of a substance is known as endothermic process. On the other hand, a process in which energy is released by the molecules of a substance is known as exothermic process.

Condensation : A process in which vapors change into liquid as bonds are formed and energy is released.

Freezing : A process in which liquid changes into solid as bonds are formed and energy is released.

Deposition : A process in which particles of a substance come closer to each other resulting in bond formation and release of energy.

Sublimation : A process in which solid state directly changes into gaseous state without undergoing liquid state is known as sublimation. In this process, bonds break and energy is absorbed by the solid particles.

Evaporation : A process in which liquid changes into gas as energy is absorbed leading to breakage bond.

Melting : A process in which solid changes into liquid as energy is absorbed leading to breakage bond.

Thus, we can conclude that given processes are sorted as follows.

Answer:

Light energy is absorbed by plants and converted to chemical energy.

Explanation:

Answer: third diagram

Explanation:

We have that we use dissolving, filtration and distillation to separate sand from salt

Sand can be separated adding water to the mixture upon dissolving we filter to get the salt solution out of the sand

Then we distill by boil salt solutions at vaporization temperature of water to get salt back the water and salt solution to get salt back

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Final answer:

Using the conservation of momentum, the final speed of the boy after throwing the pumpkin is 0.7467 m/s to the left, and the final speed of the girl after catching the pumpkin is 0.6857 m/s to the right.

Explanation:

The problem you're trying to solve involves the conservation of momentum, because momentum is conserved when objects interact in a closed system without external forces, such as the scene described with skaters on ice. To find the final speeds of the boy and the girl, we'll use the principle of conservation of linear momentum. Since initially they are both at rest and the boy throws the pumpkin, the final momentum of the system must be zero.

Using the equation for conservation of momentum: momentum before the throw = momentum after the throw. Initially, both the boy and the pumpkin are stationary, so their initial combined momentum is 0. After the boy throws the pumpkin, he will move in the opposite direction to conserve momentum.

Momentum of the boy after the throw: m_boy × v_boy = 0 - (mass of pumpkin × velocity of pumpkin)
Momentum of the girl after catching the pumpkin: m_girl + mass of pumpkin × v_girl = mass of pumpkin × velocity of pumpkin

m_boy = 45kg (mass of the boy)
m_pumpkin = 12kg (mass of the pumpkin)
v_pumpkin_initial = 2.8 m/s (speed of the pumpkin)

Let's calculate the speed of the boy after he throws the pumpkin:

45kg × v_boy = 0 - (12kg × 2.8 m/s)
v_boy = (-33.6 kg×m/s) / 45kg
v_boy = -0.7467 m/s

The negative sign indicates that the boy is moving in the opposite direction to the pumpkin's initial movement. Now, let's find the speed of the girl after catching the pumpkin:

(37kg + 12kg) × v_girl = 12kg × 2.8 m/s
49kg × v_girl = 33.6 kg×m/s
v_girl = 0.6857 m/s

The boy's final speed is 0.7467 m/s to the left, and the girl's final speed is 0.6857 m/s to the right.

The illustration represents that the light ray striking the object is reflected. Hence, option (D) is correct.

The given problem is clear explanation for the reflection of light rays. The phenomena by which the rays of light strikes a surface bounce back exactly from the surface by making some angle with respect to normal, is known as reflection of light ray.

In the given figure, we can clearly observe that the light ray is striking the vertical surface somewhere from the bottom, which is known as incident ray. When this ray strikes the surface it bounce back from the surface and we can observe the upward arrow to represent the reflected ray of light.

Thus, we can conclude that the illustration represents that the light ray striking the object is reflected. Hence, option (D) is correct.

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Explanation :

The forces acting on hot- air balloon are:

Weight, (W)

Force due to air resistance, (F)

Upthrust force, (U)

Its weight W is acting in downward direction. The upthrust force U acts in upward direction. When the balloon is moving upward, the air resistance is in downward and vice versa.

In this case, the hot-air balloon descends vertically at constant speed.

so, [tex]a=0[/tex]

and [tex]F=ma=0[/tex]

so, [tex]W = F + U[/tex] ....................(1)

when it is ascending let the weight that it is releasing is R, so

[tex](W-R) + F = U[/tex]..........(2)

solving equation (1) and (2)

[tex](W-R)+F=W-F[/tex]

[tex]R=2F[/tex]            

2F is the weight of material that must be released from the balloon so that it ascends vertically at the same constant speed.

Answer:  (B) .2 F

Explanation :

The weight is always downward and it is a constant.

The upthrust fore U acts  upward and it has always same value as it depend on the difference in height between the top and bottom surface of the air balloon.

The direction of the force due to air resistance depends on the motion and air resistance always opposite motion. air resistance downwards that means the air balloon will ascending and air balloon will descending then air resistance is upwards.

So, air resistance depends on speed .

When air balloon descending at constant speed

Air resistance = F

A constant speed means acceleration is zero that means the resultant force is zero.

W = F + U.....(I)

When air balloon ascending

air resistance = F downwards

Some weight of the material needs to be released for the resultant force to be zero.

Suppose, the weight to be released be R.

(W - R) + F = U......(II)

From equation (I)

U = W- F....(III)

The upthrust force has same value throughout the motion.

Now, put the value of U in equation (I)

W - R + F = W - F

-R = - F - F

R = 2 F

Hence, this is the required solution.

The best statement that represents the work is being done is A car being towed down a street.

The meaning of the work in terms of physics should represent the measurement of the energy transfer that arises at the time when the object should be moved over the distance via the external force also it should be applied at the displacement direction.

Therefore, The best statement that represents the work is being done is A car being towed down a street.

This question is incomplete. Please find the options below.

f A lamp hanging from a ceiling

g A rocket drifting through space

h A man pushing against a concrete wall

j A car being towed down a street

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Final answer:

Scientific work requires a force to cause an object's displacement in the direction of the force, and is calculated by the equation W = Fd cos θ. No work is done if there is no displacement or the force is perpendicular to the direction of displacement.

Explanation:

The scientific definition of work differs from everyday use. In physics, work requires that a force causes a displacement of an object, and the force must have a component in the direction of the displacement. This process implies a transfer of energy. To calculate work done (W) scientifically, you use the equation W = Fd cos θ, where F is the magnitude of the force applied, d is the displacement of the object, and θ is the angle between the force vector and the displacement vector. When there's no displacement or the force is perpendicular to the displacement, no work is done according to science.

For example, pushing against a wall would not be considered work in the scientific sense because the wall does not move—there's no displacement. However, lifting an object off the ground does constitute work as the direction of the force (upwards) is the same as the direction of the movement (also upwards), and the object is displaced from its initial position.

Newton's Second Law of Motion which states that the acceleration an object experiences is directly proportional to the force applied to it

Answer:

Potential energy is the energy possessed by a body at rest while kinetic energy is the energy possessed by a body in motion.

Explanation:

Potential energy is the energy possessed by a body by virtue of its position while kinetic energy is the energy possessed by a body by virtue of its motion. Potential energy is the energy acting on a body at rest(not moving) while kinetic energy is the energy acting on moving object(motion).

Example of potential energy is the energy possessed by a parked car. The parked car is not moving i.e the car is in a state of rest

Example of kinetic energy is the energy possessed by an accelerating car. The car is in motion (moving).

Answer:

Answer:

1. Fermi

2. Neutron

3. Fission

4. Atomic mass

5. Fusion

6. Becquerel

7. Curie

Explanation:

The correct answer is D) refraction! Hope this helps!

Answer:

i think it is D, hope this helps

The speed of a wave with a frequency of 8,500 Hz and a wavelength of 1.5 m is calculated as 12,750 m/s by multiplying the frequency and wavelength together.

To calculate the speed of a wave, we can use the formula v = f × λ, where v is the speed of the wave, f is the frequency, and λ (lambda) is the wavelength. Given that the frequency, f, is 8,500 Hz and the wavelength, λ, is 1.5 m, you can plug these values into the equation to determine the wave's speed.

Speed of the wave v = 8,500 Hz × 1.5 m = 12,750 m/s

So, the speed of the wave with a frequency of 8,500 Hz and a wavelength of 1.5 m is 12,750 meters per second (m/s).

The loudness of a sound can be increased by increasing the amplitude of the sound wave. This can be achieved by adjusting the volume on a speaker or by using devices designed to amplify sound, like a vuvuzela. Also, sounds with higher amplitude and intensity, such as those from a loud car stereo, are naturally louder.

The loudness or volume of a sound wave can be increased by increasing its amplitude. The amplitude of a sound wave determines how much energy it carries, which directly affects its loudness. An example of this is how a speaker produces louder sounds: as you increase the volume on a speaker, it causes the table or surface it is on to vibrate more vigorously. This is because the speaker is moving more air (higher amplitude), which translates to a louder sound.

Another example is using a vuvuzela. The size and construction of the vuvuzela are designed to amplify the sound produced by the person blowing into it, making it louder. The amplified sound has a higher amplitude and therefore a louder volume.

Finally, in a real-life scenario, consider two sounds: one from a passing car's stereo and the other from the person next to you. The sound from the car's stereo is amplified due to its higher intensity and amplitude, making it louder and causing it to dominate over the sound coming from the person next to you.

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sound waves and light waves are both types of waves that exhibit similar behaviors such as reflection, refraction, and interference. However, they differ in their physical properties such as the medium they travel through, their speed, and their frequency.

Sound waves and light waves are both types of waves that propagate through a medium, but they have several differences in their physical properties and behaviors.

Physical Properties:

1. Medium: Sound waves require a medium to travel through, such as air, water, or solids. Light waves, on the other hand, can travel through a vacuum and do not require a medium.

2. Speed: Sound waves travel at a slower speed than light waves. The speed of sound waves depends on the density and compressibility of the medium through which they are traveling. In contrast, the speed of light waves is constant in a vacuum and is one of the fundamental constants of nature.

3. Frequency: Sound waves have lower frequencies than light waves. The frequency of a sound wave is the number of cycles per second, measured in hertz (Hz). Light waves have much higher frequencies, typically measured in terahertz (THz).

Behaviors:

1. Reflection: Both sound waves and light waves can reflect off surfaces. When a sound wave reflects off a surface, it changes direction, and the angle of incidence is equal to the angle of reflection. When a light wave reflects off a surface, it undergoes a change in direction and can be either specular (like a mirror) or diffuse (like a matte surface).

2. Refraction: Both sound waves and light waves can be refracted or bent when they pass through a medium with a different density. When a sound wave is refracted, it changes direction and speed, while when a light wave is refracted, it can change direction, speed, and wavelength.

3. Interference: Both sound waves and light waves can exhibit interference when two or more waves combine to form a resultant wave. In sound waves, interference can be constructive, where the amplitudes of the waves add together, or destructive, where the amplitudes cancel each other out. In light waves, interference can be either constructive, where the waves add together to create bright fringes, or destructive, where the waves cancel each other out to create dark fringes.

Therefore, sound waves and light waves are both types of waves that exhibit similar behaviors such as reflection, refraction, and interference. However, they differ in their physical properties such as the medium they travel through, their speed, and their frequency.

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the answer is c) spread out

Answer:

d.

No, if velocity becomes too great, the planet can escape the Sun's gravitational pull.

Explanation:

It is correct on Edge 22

The force exerted by the first object on a second object is known as the action force, a part of Newton's Third Law of Motion, which states that equal and opposite forces are exerted on both objects involved in an interaction.

The name given to the force exerted by the first object on a second object is generally referred to as the "action" force. This is a part of Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. This law means that whenever one body exerts a force on a second body, the second body simultaneously exerts a force that is equal in strength and opposite in direction to that of the first body.

This concept is significant because it underlines the symmetry of forces in nature. When object A exerts a force on object B, object B exerts a force back on object A. These forces are equal in magnitude but opposite in direction, reflecting Newton's Third Law which is often informally referred to as the law of action and reaction.