I think that the answer is C but give me a minute to make sure I’m correct
the discovery by Nikola tesla that out-of-phase alternating currents caused rotation is considered one of the 10 greatest scientific discoveries.
What is current ?A movement of charged particles, such as electrons or ions, through an electrical conductor or a vacuum is known as an electric current. The net rate of electric charge flow through a surface is how it is described Charge carriers, which can be any of a number of particle kinds depending on the conductor, are the moving particles. Electrons flowing over a wire are frequently used as charge carriers in electric circuits. They can be electrons or holes in semiconductors. Ions are the charge carriers in an electrolyte, whereas ions and electrons are the charge carriers in plasma, an ionized gas.
The passage of electric charge across a surface at a rate of one ampere is the SI unit for electric current.
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The siren from a small town fire station is heard at a location 3 kilometers away. If the air temperature is 20°C, at what velocity did the sound travel? 319 m/s 331 m/s 343 m/s 387 m/s
Answer:
343 m/s
Explanation:
The velocity of sound in dry air varies with temperature as:
v ≈ 331.4 + 0.6 T
where v is velocity in m/s and T is temperature in degrees Celsius.
At 20°C:
v ≈ 331.4 + 0.6 (20)
v ≈ 343.4
So the sound traveled at approximately 343 m/s.
Why does water have a high surface tension? (2 points) Hydrogen bonding keeps water molecules close together. Water is a liquid at room temperature. The lengths of the bonds in water molecules can change. Water molecules contain 18 electrons.
The correct answer is A. Hydrogen bonding keeps water molecules close together.
Explanation:
In physics, surface tension refers to the tension that is created in the surface of liquids as a result of bonds or attraction between particles and that makes the surface layer denser than the rest of the liquid. In the case of water, this occurs due to the bonds created between the hydrogen particles with other particles in water that create a surface that is denser and flexible. This only occurs in the surface while particles in the rest of the liquid do not form these bonds. Considering this, it can be concluded water has a high surface tension because "hydrogen bonding keeps water molecules close together".
Water has a high surface tension due to two key factors:
hydrogen bondingliquid state of water at room temperature.Why does water have a high surface tension?The high surface tension of water arises primarily from the presence of hydrogen bonds between water molecules and the fact that water is a liquid at room temperature.
Hydrogen bonding occurs when the positively charged hydrogen atom in one water molecule is attracted to the negatively charged oxygen atom of another water molecule. These hydrogen bonds create cohesive forces holding the water molecules close together.
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A box experiencing a gravitational force of 600 N is being pulled to the right with force of 250 N. A 25 N frictional force acts on the box as it moves to the right.
Answer: 0 NEWTONS
Explanation:
Photoelectrons with a maximum speed of 7.0 x 10^5 m/s are ejected from a surface in the presence of light with a frequency of 8.00 x 10^14 Hz. Calculate the energy required to eject photoelectrons from the surface
Final answer:
The energy required to eject photoelectrons from the surface can be found using the equation E = hf, where E is the energy and f is the frequency. Substituting the given values, the energy required is 5.30 x 10^-19 J.
Explanation:
Energy required to eject photoelectrons from the surface
Max speed of photoelectrons = 7.0 x 10^5 m/s
Frequency of light = 8.00 x 10^14 Hz
The energy required to eject photoelectrons can be found using the equation:
E = hf
Where E is the energy, h is Planck's constant (6.626 x 10^-34 J.s), and f is the frequency.
Substituting the values:
E = (6.626 x 10^-34 J.s)(8.00 x 10^14 Hz) = 5.30 x 10^-19 J
The energy required to eject photoelectrons from the surface is 5.30 x 10^-19 J.
1)
Chlorine is the atomic number 17 in the periodic table of elements. What information does the atomic number give you about the element chlorine?
A) An atom of chlorine has 17 protons+.
B) An atom if chlorine has 17 protons+ and electrons-.
C) An atom of chlorine has 17 protons+ and 17 neutrons+.
D) Chlorine atoms have 17 of each of the three subatomic particles, protons, neutrons, and electrons.
2)
Consider the information you have about the element chlorine in question #1. Based on that knowledge, what do you know about the atomic structure of aluminum? All BUT ONE statement is true.
A) Aluminum has 13 neutrons.
B) Aluminum has an atomic number of 13
C) Aluminum has 13 protons+ in the nucleus.
D) The number of protons equals the number of electrons.
Answer:
1) B
2) A, B, and D
Explanation:
1) The atomic number provides the number of protons and electrons, since the number of the two are the same.
2) You DO NOT know whether or not the protons are in the nucleus (they are) based on the atomic number, that's just prior knowledge.
Answer: 1. A) An atom of chlorine has 17 protons.
2. D) The number of protons equals the number of electrons.
Explanation:
1. Atomic number is defined as the number of protons or number of electrons that are present in an atom.
For an electrically neutral atom,
Atomic number = Number of electrons = Number of protons
As atomic number of chlorine is 17, it has 17 protons and 17 electrons. It can any any number of neutrons depending on the isotope.
2.
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.
Mass number is defined as the sum of number of protons and neutrons that are present in an atom.
Number of protons of aluminium = 17
Number of electrons of aluminium = 2=8+7 = 17
Mass number = Number of protons + Number of neutrons = 17 +18 = 35
Number of protons of aluminium = Number of electrons of aluminium = 17
Thus atomic number of aluminium is 17 and Number of protons of aluminium = Number of electrons of aluminium
Janet installed a dimmer on the lights in her bedroom. She slid the dimmer switch, causing the resistance in the circuit to decrease. Assuming the voltage is constant, what affect will Janet’s actions have on the circuit? The voltage will increase from 120 to 240 volts. The lights will brighten. The current will decrease. The current will increase. The lights will dim.
Answer:
The lights will brighten.The current will increase.Explanation:
The question implies that the dimmer here is based on a resistor. For the dimmer to work properly, it needs to be connected to the lights in series. The total resistance of the series circuit is the sum of the resistance of
the dimmer resistor, andthe lights.Reducing the resistance of the dimmer resistor will reduce the total resistance of the circuit. The question states that voltage across the series circuit is "constant." There will not be a change in the voltage across the circuit. The voltage across the lights will increase but will not exceed the voltage of the power supply. The RMS voltage of power supply in the US is 120 volts. The voltage across the light will become closer to 120 volts. However, only reducing the resistance of the switch will not cause the voltage to exceed 120 volts.
[tex]\displaystyle \rm Current = \frac{Voltage}{Resistance}[/tex].
Resistance drops while voltage across the entire circuit stays the same. As a result, the current through the circuit will increase.
Current is the same for all appliances connected in series. The current in the lights will increase. Assume that the resistances of the lights stay the same,
[tex]\displaystyle \rm Power = Current^{2} \times Resistance[/tex].
Power dissipated in the lights will increase. More energy will be consumed to produce light in unit time. As a result, the lights will brighten.
An example of a product made from a renewable resource is
A) electricity made from coal.
B) coal slurry made from coal.
C) ethanol fuel made from corn.
D) plutonium made from uranium.
Answer: C) ethanol fuel made from corn.
Explanation:
Ethanol made from corn is a type of biofuel, which is made from renewable resources known as biomass (plants, for example).
In the case of bioethanol, this is produced by the fermentation of sugars (from starch) contained in the organic matter of plants, such as beets or corn.
Therefore, the correct option is C.
4 questions!! please Help!! 40 points!!
Answer: digital signals, near both poles, voltage, and the planets travel around Earth.
Explanation:
36. B. digital signal
Electronic signals that pulse current in a series of ones and zeros are known as Digital Signals. A digital signal refers to an electrical signal that is converted into a pattern of bits.
37. C. near both poles
The Magnet field would be strongest on both sides, the North and the south pole. It is equally strong at the north pole when compared with the south pole.
38. C. Voltage
A transformer is designed to convert alternating current from one voltage to another. It can be designed to "step up" or "step down" voltages
39. A. Earth travels around the sun
Earth travels around the sun, the gravity of the Sun keeps Earth and the other planets in their orbits. Just as the Moon orbits the Earth because of the pull of Earth's gravity, the Earth orbits the Sun because of the pull of the Sun's gravity.
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- A. Hazle <3
........................................................ waves are detected first because they move so fast .
.......................................... angles to the direction of movement .
A kind of scale used to measure the amount of seismic energy released by an earthquake : ................................
PRIMARY Waves Are Detected First Because They Move So Fast.
RIGHT Angles To The Direction of Movement.
A Kind Of Scale Used To Measure The Amount of Seismic Energy Released By An Earthquake RICHTER SCALE
Which of these correctly shows what happens when two magnets are placed side by side?
A. N__S 《 《N__S
B. S__N》 《N__S
C. S__N《 》S__N
D. N__S《 》S__N
Answer:
D
Explanation:
Remember that magnets only attract at different poles. If both poles are the same, they repel
When two magnets are placed side by side they can either attract or repel each other depending on the arrangement of their poles. Option B correctly shows the magnets attracting each other.
Explanation:When two magnets are placed side by side they can either attract or repel each other depending on the arrangement of their poles. In option B, the magnets are oriented in a way that the south pole of one magnet is facing the north pole of the other magnet. This is the correct representation of what happens when two magnets are placed side by side because opposite poles attract, resulting in the magnets sticking together.
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what type of reaction happens when a base is mixed with an acid
Mixing a base with an acid results in a chemical reaction called neutralization. The result is a perfectly balanced solution of salt and water with a pH of 7 if the acid and base are balanced properly. Depending on the bases and acids used, it can be a dangerous experiment.
Neutralization reaction happens when a base is mixed with an acid. Acid neutralize the base to form the salt and water.
What is the difference between the acid and base?Acid is a chemical substance that, when dissolved in water, produces a solution with higher H+ ion activity than pure water.
A base is an aqueous material that receives protons, contributes electrons, or releases hydroxide (OH-) ions. A proton donor is an acid. A base, on the other hand, is a proton acceptor.
Acid neutralize the base to form the salt and water.
Hence, neutralization reaction happens when a base is mixed with an acid.
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Why does the earth rotate?
A. Because Earth is formed from cold gases collapsing due to gravity
B. Because the matter in the nebula that formed Earth was spinning
C. Because Earth forms more than 99% of the mass of the solar system
D. Because the hydrogen atoms inside the nebula fused to form helium
Answer:
the answer I think is A im so sorry if its wrong
Explanation:
Because yes we do have gases collapsing we also have dust collapsing with it and surrounding it to make a disk type of air flow that pushes it that makes it rotate if that makes sense. yet again super sorry if its wrong.
Answer:
the answer is actually B
Explanation:
When our solar system formed out of a gas cloud, called a nebula, there was lots of dust and gas coming together due to the force of gravity. The dust and gas was already moving around in a circle. As it all clumped together to form the Sun and planets, these new objects started to spin – and then spin faster.
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Think of a sport not usually considered to be dependent on muscular strength and endurance, like golf or tennis. How could an athlete's performance in the sport you've chosen be improved by increasing their level of muscular strength and endurance? Explain your reasoning.(make the paragraph at least 5 sentences and 35 words) WRITE MORE IF YOU WANT!!!!!!!!!!!
If they play tennis but build up more strength and endurance then they may be able to hit the ball better and not miss it
Even in sports like golf, which aren't traditionally considered to be heavily dependent on strength and endurance, players can greatly improve their performance by increasing their muscular strength and endurance.
In the sport of golf, often not considered heavily dependent on muscular strength and endurance, an athlete's performance can certainly be enhanced if they focus on improving their level of muscular strength and endurance. Increased muscular strength can be used to add distance to your shots, especially during long drives. Endurance, on the other hand, can be crucial for maintaining quality of play over a long period. Golf is not only about asserting strength, but also about the repetition of accurate, precise shots. Thus, muscular endurance would prevent the golfer from tiring out after a series of swings, keeping the performance consistently high.
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which of the following is not a base?
A shampoo
B toothpaste
C bleach
D orange
Answer:
D
Explanation:
Orange juice at least is acidic and therefore not basic.
Toothpaste,bleach and shampoo are base. While orange has the acidic nature. Orange is not the base.
What is the difference between the acid and base?Acid is a chemical substance that, when dissolved in water, produces a solution with higher H+ ion activity than pure water.
A base is an aqueous material that receives protons, contributes electrons, or releases hydroxide (OH-) ions. A proton donor is an acid. A base, on the other hand, is a proton acceptor.
The important base and their uses;
1.sodium hydroxide, ------- Used in the manufacture of soaps
2.potassium hydroxide --------Used in the production of liquid soaps and soft soaps. Used in alkaline batteries.
Toothpaste,bleach and orange are base. While orange has the acidic nature. Orange is not the base.
Hence, option D is correct.
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In an effort to reduce greenhouse gas (GHG) emissions and improve fuel use, the Environmental Protection Agency (EPA) and the National Highway Traffic Safety Administration (NHTSA) are coordinating standards for the production of clean vehicles through. Which is not true as the regulations become stricter? A) Cars and trucks have larger engines. B) Vehicles have increased fuel economy. C) More efficient engines decrease emissions. D) Better emission filters diminish emissions.
Answer:
C
Explanation:
I think it could be C because, gasoline which is used by cars is a big factor in more emission being placed in the air. With electrical powered cars like Tesla, emission can decrease.
Sorry if i'm wrong
But, hope this helps :)
Answer:
The answer is A) Cars and trucks have larger engines.
Explanation:
it's right
What is the difference between chemical change and a physical change?
Answer:
Explanation:
There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.
HELP ASAP PLEASE!! ❤
If we use ______ to bring electricity into the home, then it will allow electricity to flow into the home at a faster rate.
A) Wood
B) Clay brick
C) Iron
D) Aluminum
E) Copper
F) Nickle
I believe the answer is C iron...
Answer:
E) Copper
Explanation:
Copper has the strongest conductivity form the options, the greatest conductor of all is Silver, cause it has a 105% of conduction, the next one is Copper, with a 100% and the third one would be Gold with a 70%, this is measured according to the resistance that the metal creates against the electricity flow through its material.
heeeeelp urgent
I need an compare and contrast between energy and work.
20 pts.....
energy is the ability to do work while work is the dot product of force and displacement
Work is done by applying force. Energy is the ability to perform work or an action. Both are smaller units and are related closely.
Explanation:
Work is an act of overpowering resistance.It is done by applying force. It acts as evidence of empowerment of resistance form the application of force movement.
The capability to perform some work or action is Energy. Energy can take different forms like light, electrical, heat, etc. The energy in motion is work. The energy changes form one form to another by the process of work. Work can be of only two forms. It can be either positive or negative.
Which of the following is a contact force?
A. Air resistance
B. Magnetic force
C. Gravity
D. Electrical force
Air resistance is type of contact force as the air should be in contact with the surface of moving
object to ocure air resistance.
The force that is a contact force as listed from the option is air resistance (Option A)
What is a contact force?A contact force is a force that results from the direct contact between the objects involved. Some examples of contact force includes:
Force of pushForce of pullAir resistanceNon contact force on the other hand requires no contact with the objects involved. These forces includes:
Magnetic forceElectrical forceGravitational forceWith the above information, we can conclude that the contact force in the options given is air resistance (Option A)
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How does the Earth release energy back into the atmosphere?
In general, the Earth releases energy back to the atmosphere through reflection, evaporation, and radiation. The Earth gets energy from the sunlight, part of which it absorbs, while part it reflects backwards, thus giving energy to the atmosphere. Also, the heating up of the Earth by the absorbed sunlight, radiates back in the lower layers of the atmosphere, again giving back energy to it. The water vapor is another way in which the Earth gives back energy tot he atmosphere as through the evaporation, the water vapor gets into the lower parts of the atmosphere and gives energy to it.
An atom is the smallest particle of matter
Answer:
yes
Explanation:
it makes up everything but you cant see it with out a microscope
Which type of force should she place in the cell marked x
Answer:
Gravity
Explanation:
For a space station in orbit, the centripetal force is the force of gravity.
For a child in a swing, the centripetal force is the normal force.
For a ball on a string, the centripetal force is the tension.
Answer:
Gravity
Explanation:
Gravity is one of four fundamental forces in nature. The other fundamental quantities are the electromagnetic interaction force, the weak force and the strong force. Simply put, gravity is the magnitude responsible for defining the weight of a body, being the centripetal force of orbiting objects (such as a space station, for example) and being the vertical and downward force that holds us together with the planet. Any object that moves in free fall is under the influence of gravity acceleration, which on Earth equals approximately 9.8 m / s2.
How would a geologist identify where an igneous rock was formed? A. If it has coarse grains, then it cooled slowly on the surface of the earth. If it has fine grains, then it cooled rapidly beneath the earth's surface. B. If it has coarse grains, then it cooled rapidly on the surface of the earth. If it has fine grains, then it cooled slowly beneath the earth's surface. C. If it has coarse grains, then it cooled rapidly beneath the surface of the earth. If it has fine grains, then it cooled slowly on the earth's surface. D. If it has coarse grains, then it cooled slowly beneath the surface of the earth. If it has fine grains, then it cooled rapidly on the earth's surface.
Answer:
D. If it has coarse grains, then it cooled slowly beneath the surface of the Earth. If it has fine grains, then it cooled rapidly on the Earth's surface.
Explanation:
The easiest way for a geologist to identify where the igneous rocks have formed is to look at their grains. There's two types of igneous rocks, intrusive and extrusive. The intrusive igneous rocks have formed from the magma that has cooled off slowly deeper into the crust, thus their crystals had more time to grown, and they have coarse grains. The extrusive igneous rocks have formed from the lava that has cooled off quickly on the surface, thus their crystals had very little time to grow, so they have fine grains.
The correct option is D. If it has coarse grains, then it cooled slowly beneath the surface of the earth. If it has fine grains, then it cooled rapidly on the earth's surface.
To understand why option D is correct, let's consider the processes of igneous rock formation and the factors that influence grain size:
1. Intrusive (plutonic) rocks are formed from magma that cools and solidifies within the Earth's crust. This slow cooling process allows for the formation of large crystals, resulting in coarse-grained rocks. Since the cooling is slow, the mineral ions have more time to move and form larger crystals. Examples of intrusive rocks include granite and gabbro.
2. Extrusive (volcanic) rocks are formed from lava that cools and solidifies on the Earth's surface. This rapid cooling process does not allow much time for crystal growth, resulting in fine-grained or aphanitic rocks. The rapid cooling rate traps the mineral ions before they can organize into larger crystals, leading to a rock with small, barely visible crystals. Examples of extrusive rocks include basalt and rhyolite.
Therefore, the identification of the environment in which an igneous rock was formed is based on the texture of the rock, which is indicative of the cooling rate:
- Coarse grains (phaneritic texture): The rock cooled slowly, which typically occurs beneath the Earth's surface where the surrounding rock acts as an insulator, slowing down the cooling process. This is characteristic of intrusive rocks.
- Fine grains (aphanitic texture): The rock cooled rapidly, which typically occurs on the Earth's surface where the lava is exposed to the atmosphere or water, leading to quick heat loss. This is characteristic of extrusive rocks.
Based on this understanding, the correct identification is:
- If an igneous rock has coarse grains, it cooled slowly beneath the surface of the earth (intrusive).
- If an igneous rock has fine grains, it cooled rapidly on the earth's surface (extrusive).
Hence, option D is the correct answer.
Amplitude modulation is used in?
A.AM radio
B.microwave ovens
C.the internet
D.FM radio
Amplitude modulation is used in AM radio.
Answer is A.
Answer:
Amplitude modulation is used in AM radio.
Explanation:
Information signals must be transported between a transmitter and a receiver on some form of transmission medium. However, information signals rarely find a suitable way to transmit. Therefore, modulation is defined as the process of transforming information from its original form to a form more suitable for transmission, and is performed on the transmitter in a circuit called a modulator.
AM means modulated amplitude or amplitude modulation; it consists in varying the amplitude of a carrier wave of relatively high frequency according to the amplitude of the modulating signal (information). Frequencies that are high enough to radiate efficiently through an antenna and propagate through free space are commonly called radio frequencies.
AM was the first technique that was used to make radio.
Then amplitude modulation is used in AM radio.
Help with this.
....
Answer:
Explanation:
The x component is the adjacent side making up the given angle (39.4)
The vector is the hypotenuse.
The definition of the cos (x) is adjacent / hypotenuse.
cos(39.4) = adjacent / 47.3 Multiply both sides by 47.3
47.3 * cos(39.4) = adjacent Cos(39.4) = 0.7727
adjacent = 36.55
Which scientist began organizing elements into the periodic table?
A. Alfred Wegener
B. Dmitri Mendeleev
C. Sir Isaac Newton
D. Sir Francis Bacon
Answer:
B. Dmitri Mendeleev
Explanation:
he invented it
Dmitri Mendeleev, a chemist scientist is the one who designed the periodic table by organizing elements.
Answer: Option B
Explanation:
Dmitri Mendeleev, a chemist scientist is represented as the father of the periodic table. He was a popular lecturer in Russia during the 1860’s. He also an author of the book ‘Principles of chemistry’. The elements are being organized based on their atomic weight and based on which he designed the periodic table.
According to Ohm's law, a circuit with a high resistance _____. will have a low electric current will have a high electric current will have an equal electric current will have an electric current but the relative amount cannot be determined
Answer:
current
Explanation:
According to Ohm's law, a circuit with a high resistance will have a low electric current
Explanation:
The basic electricity law is Ohms law. It considers three important elements which that electrical quantities. They are voltage, resistance and current. According to this law, the electric current that flows in a circuit has direct proportionality to the voltage and inverse proportionality to the resistance.
Thus, if a circuit has high resistance it implies that the electric current flowing in that circuit is low. If the circuit voltage is increased, there will be an increase in the current but the circuit resistance will remain unchanged. Hence, current is related with both voltage and resistance. Current has direct proportionality to voltage and inverse to the resistance.
The brightness of a star depends on its (color, composition of atmosphere, or distance from earth), and stars that are closer look (brighter, dimmer, or white).
Answer:
Distance, Brighter
Explanation:
Think of a flash light, one close and one far which is brighter and which is dimmer.
Hope this is what your teacher put as the answer!
Answer:
Distance, brighter
Explanation:
Brightness depends upon the amount of power that is radiated by a star
This in turn follows the inverse square law. That is, as the distance from the object increases, brightness decreases as the square of the distance.
Color depends on the composition of the star's radiation.
When the stars are bright, it can be understood that they are closer, compared to other stars.
According to the law of conversion of matter, which chemical equation represents a possible chemical reaction
a. 2Na+ Cl2=2NaCl is the most possible chemical reaction that can occur
which of the following occurs as a light wave bends when it passes from one medium to another
a constructive interference
b destructive interference
c refraction
d reflection
Refraction is a phenomenon in which a light wave bends or changes its direction when passing through a medium with a refractive index different from the other medium.
Being the refractive index [tex]n[/tex] is a number that describes how fast light propagates through a medium or material, and is defined as the relation between the speed of light in vacuum ([tex]c=3(10)^{8}m/s[/tex]) and the speed of light [tex]v[/tex] in the second medium:
[tex]n=\frac{c}{v}[/tex]
It is important to note that in this process, the wavelength may be modified because it depends on the medium, however, the refracted ray of light does not change its frequency.
The bending of a light wave as it passes from one medium to another is called refraction, which is caused by the change in speed of light in different indexes of refraction and is not related to constructive or destructive interference.
When a light wave bends as it passes from one medium to another, the phenomenon is known as refraction. Refraction occurs due to the change in speed of light as it enters a medium with a different index of refraction. This bending does not result from interference patterns such as constructive interference or destructive interference, which are related to the alignment of wave crests and troughs when two waves meet.
Constructive interference leads to an increase in amplitude when crests align with crests and troughs with troughs, whereas destructive interference occurs when crests align with troughs, canceling each other out. These interference effects are typically observed in phenomena such as light passing through narrow slits or thin films, not in the simple bending of light as it moves between different media.