Answer:
The one with highest velocity
Explanation:
The momentum of an object is given by
[tex]p=mv[/tex]
where
m is the mass of the car
v is the velocity of the car
In this problem, we have two identical cars: identical means they have same mass, so
[tex]m_1 = m_2 = m[/tex]
The momentum of car 1 is
[tex]p_1 = mv_1[/tex]
while the momentum of car 2 is
[tex]p_2 = mv_2[/tex]
By comparing the two expressions, we see that the car with greatest momentum is the one with highest velocity, since the mass is the same.
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.
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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Countries establish internal economic zones in order to
have fewer economic restrictions
Explanation:
Answer:
have fewer economic restriction
Explanation:
just took quiz
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:
........................................................ 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
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.
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.
a simple pendulum has a period of 3secs. if the value of g is 9.9m/s^2. calculate the length of the pendulum
Answer:
2.3 m
Explanation:
A simple pendulum has a period of:
T = 2π √(L/g)
If T = 3 seconds and g = 9.9 m/s², then L is:
3 = 2π √(L/9.9)
3/(2π) = √(L/9.9)
(3/(2π))² = L / 9.9
L = 9.9 (3/(2π))²
L ≈ 2.3 m
To calculate the length of the pendulum, use the formula T = 2π√(L/g). Rearrange the formula, plug in the given values for T and g, and solve for L.
Explanation:To calculate the length of the pendulum, we can use the formula for the period of a simple pendulum which is T = 2π√(L/g). In this case, we are given that T = 3 sec and g = 9.9 m/s². Plugging in these values, we can rearrange the formula to solve for L:
T = 2π√(L/g)
3 = 2π√(L/9.9)
Squaring both sides of the equation, we get:
9 = 4π²(L/9.9)
Dividing both sides of the equation by 4π² and multiplying by 9.9, we get:
L = (9.9 * 9) / (4π²)
Calculating this expression, we find that the length of the simple pendulum is approximately 0.250 m.
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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.
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 the seventeenth century, astronomer Johannes Kepler observed the planets revolving around our sun and analyzed data about them. He found that as the distance from the Sun increases, the amount of time it takes for the planet to go all the way around the Sun increases. Even though Kepler did not know why his observation was true, it has been found that planets in all solar systems always revolve around suns the same way.
Which best describes why Kepler’s observation of planetary motion is a law instead of a theory?
It does not discuss independent and dependent variables that can be observed or tested.
It does not provide an explanation for why the relationship exists between distance and orbit time.
A lot of new technology has been developed that can record more accurate data about planetary motion.
A lot of different understandings of why planets move have been developed, and Kepler’s provides the best explanation.
Answer:
"A lot of different understanding of why planets move have been developed, and Kepler's provides the best explanation."
Explanation:
All of the other three choices actually contradict the initial question which is asking why Kepler’s observation of planetary motion is a law instead of a theory. A law is a well established theory which means that it is an emergent truth that is known to be true. Kepler's laws have been verified and proven numerous times:) For a deductive proof of Kepler's laws look to Sir Isaac Newton.
The statement that best describes why Kepler’s observation of planetary motion is a law instead of a theory is, It does not provide an explanation for why the relationship exists between distance and orbit time.
What is Kepler's law of planetary motion?The law says that planets revolve in elliptical orbits around the Sun as a focus. Also, it covers the same area of space in the same amount of time while orbiting. The third law is orbital period of a planet is proportional to its semi-major axis.
The law gives the relation between time and distance according to second and third law. But, if we go about the reason, why is so? Then, it has no answers.
Thus, It does not provide an explanation for why the relationship exists between distance and orbit time.
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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.
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
8.
An airplane sprinkles black soot on a snow-covered field. The soot will increase the rate that the snow melts because _____.
Black soot decreases the albedo of snow, leading to increased absorption of solar radiation and faster snow melting due to positive feedbacks in climate dynamics.
Explanation:An airplane sprinkles black soot on a snow-covered field. The soot will increase the rate that the snow melts because the darker-colored soot absorbs more solar radiation than the light-colored snow. Unlike snow, which has a high albedo and reflects most solar radiation, soot has a low albedo and thus absorbs more heat, leading to faster melting of the snow. This process is a part of positive feedbacks in climate dynamics, where an initial change is amplified by the effects it induces, such as increased absorption of solar energy leading to further melting.
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.
What is the source of the radioactivity in the sun
Answer:
Fusion of Hydrogen to form Helium
Explanation:
The sun is a big ball of gas and it provides solar energy that drives external processes on the earth surface.
The pressure and temperature within the sun provides energy to fuse abundant hydrogen atoms together to form helium atoms. This nuclear fusion process releases a huge amount of energy.
The fusion of hydrogen atoms to form helium is the source of radioactivity in the sun.
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
An object that has the ability to do work has __________ energy.
Answer:
Kinetic energy. ( i didnt reallysee if someone answered already but if so, sorry!)
Answer:Kinetic energy
Explanation:
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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what term describes the rate at which electric energy is used
Answer:
Power (P)
Explanation:
In electromagnetism, power is defined as the rate at which electric energy is used:
[tex]P=\frac{E}{t}[/tex]
where
E is the electric energy
t is the time
Power is measured in Watts (W), where 1 W corresponds to 1 Joule per second (1 J/s).
In electric circuits, power can be also rewritten as
[tex]P=VI[/tex]
where
V is the voltage drop on the element we are considering
I is the current flowing through the element
The power dissipated through a resistor is also written as
[tex]P=I^2 R[/tex]
where I is the current through the resistor and R the resistance.
An atom is the smallest particle of matter
Answer:
yes
Explanation:
it makes up everything but you cant see it with out a microscope
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
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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Look at the figure, which shows the motion of three balls. The curved paths followed by balls B and C are examples of _____. projectile motion rolling friction linear motion fluid friction
Answer:the answer is projectile motion
Explanation:
Answer:
projectile motion
Explanation:
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.
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.
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.
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.
The energy transfer diagram represents the energy of a light bulb.
How much electrical energy is involved in this transformation?
60 J
80 J
100 J
120 J
Answer:
D) 120 J
Explanation:
EDG 2019-2020
The electrical energy is involved in this transformation will be 120 J. Option D is correct.
What is the law of conservation of energy?According to the law of conservation of energy, the energy of an isolated system stays unchanged throughout time; it is said to be conserved.
Energy can not be created nor be destroyed and can be transferred from one form to the other form.
We have an initial amount of electrical energy. Which is turned into two types of energy, electric and the light energy.
Electrical energy, (E)=?
Light energy (L)=100 J
Heat energy (H) =20 J
The equation is found as;
[tex]\rm E= L + H \\\\ E=100+20 \\\\ E=120 \ J[/tex]
Hence, the electrical energy is involved in this transformation will be 120 J.
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