really need help! i dont understand this

Answer:

magnetic field

Explanation:

Answer:

magnetic field

Explanation:

How do fission nuclear reactions differ from fusion nuclear reactions?

A. Fission reactions involve the conversion of matter into energy, but fusion reactions do not. 

B. Fusion reactions involve the conversion of matter into energy, but fission reactions do not. 

C. Fission reactions are used to generate electricity for consumers, but fusion reactions are not. 

D. Fusion reactions are used to generate electricity for consumers, but fission reactions are not.

Answer:

C

Explanation:

Both fission and fusion are nuclear reactions that produce energy, but their applications differs.

 Fission is the splitting of a large (heavy, unstable) nucleus into smaller ones, and fusion is the process where nuclei of small atoms are combine together to form the nuclei of larger atoms releasing vast amounts of energy.

The correct answer is c. Fission reactions are used to generate electricity for consumers, but fusion reactions are not.

The physics of fusion is the process that makes the sun shine, and that makes the hydrogen bomb explode.

Answer:

a=805714*10^2

b=1.2*10^18

Explanation:

a) v=lf

Where l is wavelength sorry can't draw it

3*100000000=l*350000

L=8. 5714*10^2

b) v=lf

300000000=0.00000000025f

f=1.2*10^18

Final answer:

The gold releases 109,200 joules of heat as it cools from 90°C to 20°C. The specific heat capacity of gold (0.129 J/g°C) and the mass of the gold (12 kg) were used to calculate the heat transfer.

Explanation:

To calculate how much heat is given off when 12 kg of gold cools from 90°C to 20°C, we use the formula for heat transfer Q = mcΔT, where m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.

First, we need the specific heat capacity of gold, which is 0.129 J/g°C. Since the mass of gold is given in kilograms, we need to convert it to grams (1 kg = 1000 g). The mass of the gold is 12000 g (12 kg * 1000 g/kg).

The change in temperature (ΔT) is the final temperature minus the initial temperature, which is 20°C - 90°C = -70°C.

Now we can calculate the heat transfer:

Q = m * c * ΔT
Q = 12000 g * 0.129 J/g°C * (-70°C)
Q = -109200 J

Negative sign indicates that the heat is released. Thus, the gold releases 109,200 joules as it cools.

Answer: It will increase

The magnetic force increases as the distance between two magnetic poles decreases due to the greater strength of the magnetic field when closer together.

As the distance between two magnetic poles decreases, the magnetic force increases. This is because the strength of the magnetic field from a magnet decreases with distance. When two magnetic objects are brought closer together, the field strength at each object due to the other's pole becomes greater, which results in a stronger magnetic force between them. The relationship between magnetic force and distance is similar to that of electric forces and can be thought of in the same way as Coulomb's Law for electric charges, where the force decreases with the square of the distance between the charges.

In practical terms, when you bring a magnet closer to a piece of iron, the magnetic potential energy of the system decreases because the magnet is moving to a lower potential energy state as it is attracted to the iron. Conversely, if you push two repelling magnets together, their magnetic potential energy increases because work is done against the repulsive force.

Answer:

Explanation:

The variables we know and are given are:

time, t = 20s

Charge, Q = 3x1-^-6 electrons, which is just 3x10^-6C (C stands for Coulombs, which is the unit for Charge)

We need to find the current, I, and since we know Q and t we can substitute these values into the given equation:

I=Q/t (which if you look at what the RHS is saying, its Charge over time, or more literally means the amount of charge passing a point over a period of time)

If we substitute these values, we will get I as:

I = Q / t

I = 3x10^-6 / 20

I = 1.5x10^-7 A

Hope this helps!

Answer:

I think it's A. 0.008 s

Explanation:

divide 15,000 w/0.008 s

=1,875,000

Answer:

negative with respect to the other end

Explanation:

Electrons are subatomic particle which carries negative charge. They are attributed to carry the electrical charges in solids.

Since electron carries negative charge , if it flows to one end of resistor then that end will have negative charge on it. Also other end has no charge so, if we compare both the ends . End with electrical charge is negative with respect to other end .

Answer:

38.52g

Explanation:

Answer:

34.24g

Explanation:

for study island said I got it correct.

Answer:

90 degrees

Explanation:

Answer: oh my goodness that is the epitome of laziness

Explanation:

Answer:

solar panels

Explanation:

The statement which best explains why the bell would not ring in this set-up is "The circuit is open." The correct option is A.

An open circuit is a circuit where the continuity has been broken, meaning there is a break in the path that the electrons travel on. This can be caused by a switch being turned off, a wire becoming disconnected, or a component in the circuit failing. Without a complete path for the electrons to flow, the circuit is considered "open" and no current can flow. As a result, any devices or components in the circuit will not function.

Here in the Question,

An electric circuit needs to be closed in order for the current to flow and for the doorbell to ring. In this setup, the wire attached to the contact screw needs to be connected to the wire attached to the steel bar in order to close the circuit. If the circuit is open, there will be no current flowing and the bell will not ring.

Option B is not correct because the electromagnet having an iron core is necessary for the doorbell to work. The electromagnet is created by the U-shaped iron core with coils of wire around it. When current flows through the wire, it creates a magnetic field that attracts the steel bar, causing the striker to hit the bell.

Option C is not correct because a closed circuit is necessary for the doorbell to work, not an open circuit.

Option D is not correct because the electromagnet needs to be made of iron or another ferromagnetic material, not steel, in order to create a strong magnetic field.

Therefore, The correct answer is Option A.

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Answer: The answer would indeed be A.

Explanation: I Hope this Helps!

Answer:

object moving at a constant velocity will always have a

Zero acceleration

Answer:

Zero Acceleration

Explanation:

Correct on Edge

Answer:

30Ω

Explanation:

To calculate the equivalent resistance in the circuit, do the following:

Step 1:

10Ω and 20Ω are in series connection. Therefore their equivalent is: 10 + 20 = 30Ω

Step 2:

The equivalent resistance (30Ω) obtained from the above is in parallel connection with 30Ω resistance shown in the diagram above.

Therefore their equivalent is given by:

1/30 + 1/30 = 2/30 = 1/15.

Now invert to obtain the equivalent

Therefore, the equivalent is 15Ω

Step 3:

Determination of the overall equivalent of the resistance of the circuit.

The new equivalent resistance 15Ω obtained above is in series connection with 15Ω resistance in the diagram above.

Therefore their equivalent is given by:

15Ω + 15Ω = 30Ω

Therefore, the equivalent resistance in the circuit is 30Ω

Answer:

"Where are we?" versus "Why are we here?" is a common example. We may never be able to explain why we exist or for what purpose we exist, but we can point to a map or coordinates and produce scientific evidence of where we are.

Explanation:

What temperature a water boil is a question of science, and what purpose life serves is a question of philosophy.

What degree does water begin to boil?

The answer is that at sea level, water boils at 100 degrees Celsius (212 degrees Fahrenheit).

Because it includes a quantifiable and reproducible phenomenon, this query falls under the purview of science. It can be resolved through experimental observations and the use of scientific ideas, particularly the comprehension of the physical characteristics of water and how they alter with temperature and pressure.

What purpose does life serve?

The answer varies depending on personal ideas, values, and philosophical viewpoints.

Given that it involves arbitrary interpretations of the meaning of life and abstract notions, this question is best suited for philosophy. It goes into more profound existential and philosophical questions that science, as an approach based on empirical observation and investigation, may not be able to answer. This is an issue that requires personal reflection and introspection rather than being something that can be objectively measured or demonstrated using scientific methods because the answer may vary for many individuals and philosophical systems.

Hence, What degrees a water boil is a question of science, and what purpose life serves is a question of philosophy.

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My answer is  D but I will still try to word it out again

Answer:D

Explanation:

Hope it helps

Answer:

A is the correct answer

Explanation:

just did the test

The correct answer is option A. The wavelength decreases by a factor of 2.

Wavelength is the distance between the crests of waves or a person's general attitude. An example of wavelength is the distance between the crest of two waves. An example of wavelength is when you and another person share the same general attitude and can thus communicate well. The distance between crests of a wave.

Both Wave 1 and Wave 2 have the same wavelength but different amplitudes. The wavelength of light is an important property for it is this that determines the nature of the light. Red light has a different wavelength from that of blue light and green light has a different wavelength from both of them.

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Answer: a network of several radio telescopes wired together 

Explanation:

A radio interferometer combines signals of several radio telescopes which are used in astronomical observations simultaneously to simulate a discretely-sampled single telescope of very large aperture

Interferometer, an instrument that uses the interference patterns formed by waves to measure certain characteristics of the waves themselves or of materials that reflect, refract, or transmit the waves. Interferometers can also be used to make precise measurements of distance.

Answer:

Disease and insects

Explanation:

Carving into tree bark opens the tree to risks such as insect infestation, diseases like Dutch elm disease and chestnut blight, and environmental stress factors.

When Missourians carve their initials into the bark of a tree, the damage leaves the tree open to insects, disease, and other environmental stresses. The tree's bark is a protective barrier, and when it's damaged, harmful organisms and factors can penetrate and cause various kinds of damage. For instance, small mammals like rodents may chew the bark further, insects such as borers can burrow into the tree's cambium, and fungal diseases can infect the tree leading to potential decay or even the tree's death.

In more severe cases, this kind of damage might enable more aggressive pathogens such as the ones responsible for Dutch elm disease or chestnut blight to enter the tree. These diseases have had a significant impact on tree populations in the U.S., causing economic and aesthetic losses. Additionally, damage to the bark can increase the likelihood of environmental stress impacts, such as damage from freezing temperatures or physical injury from larger mammals.

The wavelength of the given light is required.

The wavelength of the light is [tex]2\times 10^{-4}\ \text{m}[/tex]

v = Velocity of light = [tex]3\times 10^8\ \text{m/s}[/tex]

f = Frequency = [tex]1.5\times 10^{12}\ \text{Hz}[/tex]

Wavelength is given by

[tex]\lambda=\dfrac{v}{f}[/tex]

[tex]\Rightarrow \lambda=\dfrac{3\times 10^8}{1.5\times 10^{12}}[/tex]

[tex]\Rightarrow \lambda=2\times 10^{-4}\ \text{m}[/tex]

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The wavelength of the light is 2.00 × [tex]10^{-4 }[/tex]meters.The correct option is Option B ( 2.00 × [tex]10^{-4 }[/tex] meters ).

To find the wavelength of a beam of light traveling through a vacuum with a frequency of 1.5 × [tex]10^{12}[/tex] Hz, we use the equation that relates the speed of light (c), frequency (f), and wavelength (λ):

Given that the speed of light in a vacuum (c) is 3.00 × [tex]10^8[/tex] m/s, we rearrange the equation to solve for wavelength (λ):

Therefore, the wavelength of the light is 2.00 × [tex]10^{-4}[/tex] meters.

Convex lenses are used for correcting farsightedness, in magnifying lenses, and microscopes but not for correcting near-sightedness; concave lenses are used for that purpose.

Among the options given on uses of a convex lens, the statement that does not apply is that they are 'used for correcting near-sightedness'. A convex lens is a converging lens and is typically used to correct farsightedness (hyperopia), as it causes light rays to converge, thereby shifting the focal point to the retina for those who have difficulty focusing on nearby objects. It is also true that convex lenses are used in magnifying lenses and microscopes to produce magnified, virtual, and erect images of objects placed within their focal length. However, for the correction of near-sightedness (myopia), a concave lens is used, which is a diverging lens that helps to extend the focal length, ensuring that images are focused onto the retina rather than in front of it. Telescopes, specifically refracting telescopes, also utilize convex lenses, but reflective telescopes often use concave mirrors due to benefits such as lack of chromatic aberration and the ability to gather more light.

Answer:

false

Explanation:

we can only see wavelengths on the visible light spectrum. everything else is invisible to us

The part of the electromagnetic spectrum that the human eye can detect is divided into ultraviolet light, visible light and infrared light. This is false statement.

Electromagnetic waves, which are synchronized oscillations of the electric and magnetic fields, are the traditional form of electromagnetic radiation. The electromagnetic spectrum is created at various wavelengths depending on the oscillation frequency. Electromagnetic waves move at the speed of light, typically abbreviated as c, in a vacuum.

The oscillations of the two fields create a transverse wave in homogeneous, isotropic media when they are perpendicular to each other, perpendicular to the direction of energy and wave propagation, and perpendicular to each other.

Hence, the part of the electromagnetic spectrum that the human eye can detect is visible light.

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Answer:

I) angle of reflection = 48 degrees

II) angle of deviation = 0

Explanation:

Given that the:

angle of incident = 48º. 

According to law of reflection which state that the angle of incident is equal to the angle of reflection.

I.) Therefore,

angle of reflection = 48º. 

II.) There can only be deviation if the mirror has a diffused surface. But for a smooth plane mirror, there can never be any deviation.

Therefore ,

The angle of deviation = 0

Answer:

Explanation:

an attractive force exists between all objects with mass

In the free-body diagram shown to the right,  the gravitational force acting on the car is 14 700 N. Hence option c is correct.

Gravitational force is defined as the magnetic pull that the earth has on all other objects in the universe. Your body is kept on the ground by this force. Gravity, however, draws all mass-bearing objects in the same direction.

List every force influencing the thing. The object's free body diagram should be drawn. Identify the positive and negative directions. Add the forces in the positive direction and subtract the forces in the negative direction. The combined effect  of all pushing and pulling forces that are actually acting on an object is known as the net force.

Thus, in the free-body diagram shown to the right,  the gravitational force acting on the car is 14 700 N. Hence option c is correct.

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Answer: The answer is B

Explanation:

The Earth has an atmosphere rich in nitrogen (78%) and oxygen (20%). Aerospace engineers have designed systems that supply astronauts with air that is very similar in composition to Earth's atmosphere. This means that the air fed into spacecraft is mostly nitrogen and oxygen.

The correct statement is " The Earth has an atmosphere rich in nitrogen and oxygen." The correct option is D.

The Earth's atmosphere is rich in nitrogen (about 78%) and oxygen (about 21%), with trace amounts of other gases. This atmosphere provides a number of benefits that are critical for human spaceflight, including:

Protection from solar radiation: The Earth's atmosphere shields us from harmful solar radiation, which can cause DNA damage and increase the risk of cancer. Without this protection, astronauts would be at a much higher risk of radiation sickness and other health problems.

Regulation of temperature: The Earth's atmosphere helps to regulate the planet's temperature by trapping heat from the sun and preventing it from escaping into space. In the absence of an atmosphere, spacecraft would rapidly heat up or cool down, making it difficult to maintain a comfortable temperature for human occupants.

Breathing air: The Earth's atmosphere provides a ready source of breathable air, which is essential for human life. By imitating the composition of the Earth's atmosphere inside a spacecraft, astronauts can breathe comfortably without the need for bulky oxygen tanks or other life support systems.

In contrast, the other options are not unique features of the Earth's environment that are critical for human spaceflight:

A. The Earth has a strong magnetic field: While the Earth's magnetic field provides some protection from solar radiation, it is not essential for human spaceflight. In fact, spacecraft often use the lack of a magnetic field in space to perform scientific experiments that would be difficult or impossible to conduct on Earth.

B. The Earth has an atmosphere rich in carbon dioxide and hydrogen: While carbon dioxide and hydrogen are important components of the Earth's atmosphere, they are not critical for human spaceflight. In fact, carbon dioxide is often considered a pollutant that must be removed from the air inside a spacecraft, while hydrogen is a highly flammable gas that poses a safety risk.

C. The Earth has a strong gravitational field: While gravity is certainly important for human spaceflight, it is not unique to the Earth's environment. In fact, spacecraft can simulate the effects of gravity using centrifugal force, and some proposals for long-duration space missions involve using artificial gravity to counteract the negative effects of zero gravity on the human body.

Therefore, The correct option is D. The Earth has an atmosphere rich in nitrogen and oxygen.

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Answer:

The surface where they slip is called the fault or fault plane. The location below the earth's surface where the earthquake starts is called the hypocenter, and the location directly above it on the surface of the earth is called the epicenter. Sometimes an earthquake has foreshocks.

"As frequency increases, wavelength decreases. Frequency and wavelength are inversely proportional. This basically means that when the wavelength is increased, the frequency decreases and vice versa. Wavelength is described as the distance between a trough to a trough or a crest to a crest."

I'd recommend paraphrasing it tho.

Answer:

100 units

I hope this helps you

Answer:

A. Ff Ee and ff ee

Explanation:

The table shows approximately equal numbers of black-fur and white-fur offspring, as well as approximately equal numbers of black-eyed and red-eyed offspring. If one parent is Ff Ee and the other is ff ee, the second parent will only contribute recessive genes (f and e) to the offspring. The first parent will contribute F alleles to about half of its offspring, and f alleles to the rest, resulting in similar numbers of black fur (Ff) and white fur (ff) offspring. The same logic applies to eye color. Of the remaining answers, B is not possible because all of the offspring of these parents will have white fur. D is not possible because all of the offspring will inherit an F and an E from the first parent, so all will have black fur and black eyes. Choice C is a possible answer, but that parent combination should result in about 3/4 black-fur offspring, and 3/4 black-eye offspring.

The work done by the bicycle brakes is calculated by multiplying the braking force of 95 N by the stopping distance of 16 m, resulting in 1520 joules of work done.

To calculate the work done by the brakes on the bicycle, we need to use the work-energy principle. Work is defined as the force multiplied by the distance over which the force is applied, provided the force is applied in the direction of the movement. The formula for work is:

Work (W) = Force (F) times Distance (d)

In this case, the brakes apply a force of 95 N to the wheels, and the bicycle comes to a stop in 16 m. Therefore, the work done by the brakes is:

W = 95 N times 16 m = 1520 J (joules)

Since the direction of the braking force is opposite to the direction of motion, and the bicycle comes to a stop, the entire work done by the brakes is used to dissipate the bicycle's kinetic energy as heat and other forms of energy due to friction.