Answer is: B.)The velocity of a car reduced from 50 km/h over one minute.
Ending velocity is defined as the velocity attained by a body after completing distance at certain time interval:
v(ending velocity) = v(initial velocity) + a·t.
a is acceleration attained by the body (in this examle car).
t is time (in this example one minute).
Because velocity is reduced, acceleration has negative sign.
An car average acceleration over a period of time is its change in velocity.
Answer: B
Explanation:
Progress Learning
You live on earth. What is earth place in the universe
The Earth is situated in the Milky Way galaxy, specifically in the Solar System within the Orion Arm. It holds the position as the third planet closest to the Sun in our Solar System.
Explanation:The Earth is located within a galaxy known as the Milky Way, a system comprising billions of stars, numerous planets, and a variety of other celestial bodies. Specifically, Earth is positioned in a small subsection called the Solar System, which is located in what is known as the Orion Arm. The Solar System is characterized by its central sun and surrounding planets, of which Earth is the third nearest to the Sun. However, it should be noted that in the grand scale of the universe, our position is relatively insignificant, as the Milky Way is just one of billions of galaxies spread across an incomprehensibly vast expanse of space.
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What is a sedimentary rock formed from the remains of tiny sea animals.
Number 4.
Give 2 examples of how plants and animals affect their environment
Plants affect the environment by participating in biogeochemical cycles and showing tropisms, while animals influence ecosystems through movement and the construction of structures. Both possess chemical defenses that maintain homeostasis, impacting biological communities.
Explanation:Plants and animals significantly affect their environment through various processes. Two examples are:
Plants contribute to biogeochemical cycles, such as the carbon cycle, by photosynthesis wherein they absorb carbon dioxide and release oxygen.Animals influence their ecosystems by their movement, which can spread seeds or modify the physical environment, like beavers building dams.Plants also show tropisms, growing towards or away from environmental stimuli, which can change the structure of the habitat. Additionally, both plants and animals have chemical defenses that protect against infections and maintain dynamic homeostasis, impacting the surrounding biological community.
An element which will not combine chemically is _____.
reactive
inert
non-chemical
a chemical
please please please answer quickly and correctly
Answer: Option (b) is the correct answer.
Explanation:
When there will be completely filled orbital of an atom then it neither needs to lose or gain an electron in order to attain stability. This is because it is already stable due to completely filled orbital.
Therefore, it means that the element will be inert in nature.
For example, helium is a noble gas and its electronic configuration is [tex]1s^{2}[/tex].
As it has completely filled s-orbital so, it is stable in nature.
Whereas when an element does not have completely filled orbital then it needs to gain stability by gaining or losing an electron. This is what determines the reactivity of an element.
Thus, we can conclude that an element which will not combine chemically is inert.
"Two-thirty in the afternoon" is a measure of:
relative time
absolute time
Answer:
The correct answer is absolute time.
Explanation:
There are two types of times. One is the absolute (true) time. This time flows independently of the observer, so it cannot be altered. It is defined by itself and by its nature.
The other type is relative (apparent) time. This time is a sensitive and external measure of the duration affected by movement. It is usually imprecise, since the movements that affect it are usually variable, accelerated or delayed. An example of this is when we perceive the duration of an event in a fast way and another event in a more lasting way, being that both events take place in the same absolute time (1 hour).
Two-thirty in the afternoon it's a true time because this is independent of the observer.
Have a nice day!
Two-thirty in the afternoon is a measure of relative time.
The phrase "Two-thirty in the afternoon" is a measure of relative time. Relative time refers to a time that is fixed in terms of a repeating cycle, like the hours of the day. It contrasts with absolute time, which is a specific point in time with a date. For example, if you wanted to use an absolute time, you would say something like "July 4, 1776, at 2:30 pm." Relative time is commonly used in daily life and is understood within the context of the current day.
When dealing with time in problems, it can be helpful to express it in a single unit, such as hours or minutes, using decimal notation for fractions of the unit. This is particularly useful when performing computations, as it avoids the confusion that can arise from mixing hours, minutes, and seconds. For instance, 2:30 pm can be converted to 14.5 hours when working exclusively with hours, which can simplify math operations.
24 POINTS!!!!!!!!!!!!!!!!!!!!!!!!
Which baseball bat will hit the ball the longest distance? Students in Mr. Brant's class designed an experiment to test this research question. The table shows the trial data they collected for the different bats. Which bat, based on this data, would be the best choice if you were interested in using low force to move the ball?
A. wood
B. alloy
C. aluminum
D. alloy or aluminum
The answer is: B. alloy.
The best choise in using low force (100 N, 200 N, 300 N) to move the ball is alloy, because it has the greatest distance (25 m, 30 m, 80 m).
One newton is the force needed to accelerate one kilogram of mass (in this example bat) at the rate of one metre per second squared in direction of the applied force.
Newton's second law of motion: F = m · a.
F - force applied.
m - mass of the object receiving the force.
a - the acceleration of the object.
What steps have power plants taken to reduce the amount of sulfur oxides released into the air?
Which of the following statements is subjective? Van Gogh painted beautiful works of art. The planets revolve around the sun. Blue is a color. Einstein was a scientist.
Answer: Option (a) is the correct answer.
Explanation:
A subjective statement is defined as the statement which tends to express a belief or judgement about something.
For example, Van Gogh painted beautiful works of art.
In this statement, according to the believer Van Gogh's work of art are beautiful. This means that he believes that Van Gogh's work is good or beautiful.
Whereas the statements planets revolve around the sun, blue is a color, and Einstein was a scientist are all universal truth and not an opinion or belief of someone's.
Thus, we can conclude that the statement Van Gogh painted beautiful works of art is subjective.
what do you read the arrow in a chemical equation as meaning?
Answer:
the answer is the transfer of energy
what element has 8 protons and 8 nuetrons
When a transition metal reacts with chlorine, what types of bonds are formed between the two elements? A) ionic bonds B) covalent bonds C) transition bonds D) No bonds are formed.
Answer : The correct option is, (A) ionic bonds
Explanation:
Ionic bond : It is defined as the bond that is formed by complete transfer of electrons from one atom to another atom.
That means, the atom which looses the electron is known as electropositive atom and the atom which gains the electron is known as electronegative atom.
The ionic bond is usually formed between a metal and a non-metal.
Covalent bond : It is defined as the bond which is formed when sharing of electrons takes place between the atoms.
This is usually formed between two non-metals.
When a transition metal reacts with chlorine then they form ionic bond because transitions metals are metal and chlorine is a non-metal. So, transition metal and chlorine will form an ionic bond.
Hence, the correct option is, (A) ionic bonds
QUESTION 4
Where is desertification NOT likely to occur?
the east coast of America
California
North Africa
Central Asia
A bottle rocket experiences a 500 N force to the right and 300 N of air resistance to the left. Will it accelerate to the left, right, or not accelerate at all?
A box experiences a 20 N force to the left and two different 8 N forces to the right. Will it accelerate to the left, right, or not at all?
A car experiences a 300 N force to the right from the engine and separate 150 N force due to friction and air resistance to the left. Will it accelerate to the left, right, or not at all?
A rope experiences three 400 N forces to the left and three different 410 N forces to the right.
A skateboard is pushed up a hill with a 90 N force to the left and experiences a gravitational force of 100 N to the right
A box experiences a 20 N force to the left and a 19 N frictional force to the right.
To find that the acceleration will be on right or left, we need to find the net force between them.
Which is Net F = 500 N - 300 N = 200 N
Therefore, the acceleration will be on right side as it has greater difference as compared to left.
Here, the right side will have 2 forces of 8 N which gives the total of 16 N.
Using the net force calculation = 20 N - 16 N = 4 N.
Therefore, the box will accelerate towards left-side.
In this case, the car is experiencing +300 N to the right and -150 N on left.
On calculating the net force = +300 N- 150 N = +150 N.
Here, right side has 150 N greater force than left side. Therefore, the car will accelerate towards right.
The rope will move towards right as the net force will be 10 N towards right.
By calculating the net force = 410 N - 400 N = 10 N.
This clearly indicates that the rope will move towards right.
The skateboard will accelerate towards right as the force will be 10 N more on right than on left.
As the net force will be = 100 N - 90 N = 10 N.
Since, the 10 N more force is on right the acceleration will be on right.
The box will experience acceleration towards left as there will be greater 1 N force on left as compared to right.
On calculating the net force = 20 N - 19 N = 1 N
This shows that the box will accelerate on left side.
How many hydrogen atoms are in glucose, C6H12O6?
A. 1
B. 6
C. 12
D. 24
name three everyday exothermic chemical reaction.
a sedimentary rock that shows ripple marks have been found. what did the ripple marks tell us about the rock formed
Answer:
the answer on your test will be.
The rock formed in a fast-moving stream.
complete the concept map about metals
Metals are elements that conduct electricity and heat, have a shiny appearance, and are malleable and ductile. They often have high melting points and densities and are mostly solid at room temperature, except mercury. The production of metals has a significant environmental impact, but alloys made from metals serve in diverse applications with enhanced properties.
Explanation:Main Properties and Characteristics of MetalsMetals are elements known for their ability to conduct heat and electricity. They also have a metallic lustre (shine), are malleable (can be hammered into thin sheets), and ductile (can be drawn into wires). With high melting points and densities, metals are predominantly solid at room temperature, except for mercury (Hg), which is a liquid. In the periodic table, metals represent about 80 percent of all elements.
When considering the extraction of metals from their ores, it's important to identify the specific metal and its main ores as well as the process used to extract the metal, which often involves smelting or electrolysis. For example, aluminum is extracted from the ore bauxite through the Bayer process and electrolysis.
The environmental impact of metal production is significant, including issues like resource depletion, energy consumption, and pollution. Responsible sourcing and recycling of metals are essential to mitigate these impacts.
Metal Alloys and UsesDifferent metals have different uses based on their properties. For example, iron, which is strong and malleable, is used in construction. Alloys, like steel (an alloy of iron and carbon), often exhibit enhanced properties such as increased strength or resistance to corrosion, making them useful in a wide range of applications.
A basketball has a mass of 1 kg and is traveling 12 m/s. How fast would a 6 kg bowling ball have to travel to have the same momentum
Answer:
The velocity of the bowling should be 2 m/s in order to an have same momentum as that of basket ball.
Explanation:
Momentum is defined as motion possessed by the moving object.it is calculated by multiplying mass of the object with its velocity.
[tex]Momentum(P)=mass(m)\times Velocity(v)[/tex]
Mass of basket ball = m = 1 kg
Velocity of the basket ball,v = 12 m/s
Momentum of the basket ball = p
p = 1 kg × 12 m/s = 12 kg m/s
Mass of bowling ball = m' = 6 kg
Velocity of the bowling ball = v'
Momentum of the bowling ball = Momentum of the basket ball = p
p = m' × v'
12 kg m/s = 6 kg × v'
v ' = [tex]\frac{12kg m/s}{6 kg}= 2 m/s[/tex]
The velocity of the bowling should be 2 m/s in order to an have same momentum as that of basket ball.
Greg modeled the water cycle for a science project. He added water to a large pot. Then he placed a sheet of glass on top of the pot. He heated the pot until the water changed to water vapor. The picture below shows what Greg observed.
Which process caused the water vapor to form liquid water droplets where the drawing shows them?
A. condensation
B. evaporation
C. freezing
D. precipitation
is gasoline a solution colloid or suspension
Why dose sand absorbe heat faster than the water at the beach? and how do you know?
The reason sand at the beach absorbs heat faster than water is primarily due to its lower specific heat and low thermal conductivity, which means it needs less energy to increase temperature, and the heat stays near the surface. Water's higher specific heat and high thermal conductivity mean more energy is needed to warm it, and heat is distributed evenly throughout.
At the beach, sand absorbs heat faster than water which leads to the sand feeling hot, while the water remains cool, despite both being exposed to the same amount of sunlight for the same time. This difference in temperature increase occurs primarily due to the specific heat and thermal conductivity of each substance.
Sand has a lower specific heat compared to water, meaning it requires less energy to increase its temperature. As a consequence, with the same amount of solar energy absorbed, sand's temperature can go up about 5 degrees C, while water might only increase by 1 degree C. This shows that sand needs substantially less energy to change its temperature compared to water.
Thermal conductivity also plays a key role. Sand has low thermal conductivity, which means that the absorbed heat remains near the sand's surface, leaving lower layers cooler. In contrast, water has high thermal conductivity, enabling the heat to spread more evenly throughout, with water below the surface getting warmer along with that at the surface. As a result, sand quickly becomes hot at the top while water remains relatively cool.
The albedo effect, or reflectivity, of sand and water also influences temperature changes. When the Sun's rays hit the water at an angle, the water reflects more light and absorbs less energy, which can contribute to reduced warming. Conversely, when the Sun is directly overhead, water absorbs more light, reducing its reflectivity and allowing for greater heat absorption.
What happens to liquid when it releases enough energy
When a liquid loses sufficient energy, it changes its state from liquid to solid, a process called freezing. The particles in the liquid slow down and form fixed positions, becoming a solid. The temperature remains constant during this phase change until the entire substance has transformed.
Explanation:When a liquid releases enough energy, it undergoes a phase transition or change of state from liquid to solid, typically known as freezing. This process occurs as the particles in the liquid lose energy and slow down, enabling them to form fixed positions and turn into a solid substance. This is quite evident in water; when it cools sufficiently and loses enough thermal energy, it becomes ice.
In phase transitions, it's important to note that the temperature of a substance remains constant until the phase change is complete. For instance, the temperature of water stays at 0 degrees Celsius (32 degrees Fahrenheit) when freezing, despite losing energy, until all the water has turned into ice.
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the sun converts nuclear energy to what energy
Sun, like all stars, is able to create energy because it is essentially a massive fusion reaction. Scientists believe that this began when a huge cloud of gas and particles (i.e. a nebula) collapsed under the force of its own gravity – which is known as Nebula Theory. This not only created the big ball of light at the center of our Solar System, it also triggered a process whereby hydrogen, collected in the center, began fusing to create solar energy.
Technically known as nuclear fusion, this process releases an incredible amount of energy in the form of light and heat. But getting that energy from the center of our Sun all the way out to planet Earth and beyond involves a couple of crucial steps. In the end, it all comes down to the Sun’s layers, and the role each of them plays in making sure that solar energy gets to where it can help create and sustain life.
What is made up of usable amounts of metallic elements
The choices are:
Carbonate
ore
silicate
a mineral
The correct option is:
ore
Explanation:
An ore is an experience of rock or sediment that comprises sufficient minerals with economically valuable elements, typically metals, that can be economically derived from the deposit. The ores are obtained from the earth through mining; they are then polished (often via smelting) to extract the important element or elements.A metal is a material (an element, compound, or alloy) that is typically hard, opaque, shiny, and has good electrical and thermal conductivity.
Answer:
ore
Explanation:
cuz
Which of the following statements is true?
A. Dalton believed atoms were made mostly of empty space
B. Plasmas have a net negative charge
C. The number of protons in an element is always equal to the number of neutrons
D. Solids have a fixed mass, volume, and shape
Answer:
D. Solids have a fixed mass, volume, and shape
Explanation:
solid have fixed volume, mass and shape due to this they are closely packed.
The molecules in the solid stay in fixed points and they are tight together.
Dalton explained that all the elements are made up of atoms.
Plasmas contain both positive ions and negative charges in equal quantity.
The number of protons in an element is always equal to the number of electrons.
Thus option(D) Solids have a fixed mass, volume, and shape is the correct answer.
What causes the plates to be pulled apart?
which seismic wave refracts and cannot penetrate the core
Answer: P waves and S waves travel through the interior of the earth. P waves are the Primary waves and S waves are the Secondary waves.
P waves can travel in both solid as well as in liquid (outer core) whereas S wave can travel only through solid. When P waves enters the outer core, it gets deviated and again enters the outer core with further deviation.
In case of S waves, once it reaches the core-mantle boundary, it reflects to the side of it, forming a shadow zone commonly known as the S wave shadow zone (103°-103°). Thus it cannot penetrate through the outer core.
what 2 energy resources do not rely on photosynthesis
Nuclear energy and geothermal energy are two resources that don't rely on photosynthesis. They're generated through nuclear reactions and Earth's internal heat, respectively, offering efficient and renewable alternatives to traditional energy sources.
Two energy resources not reliant on photosynthesis are nuclear and geothermal energy. Nuclear power harnesses energy from atomic reactions, such as fission or fusion, offering high energy density and continuous supply. It faces challenges in waste management and safety. Geothermal energy utilizes heat from Earth's interior, providing renewable power with low emissions and a small footprint. However, its availability is geographically limited, and extraction may impact local ecosystems. Both are vital in reducing dependency on fossil fuels and mitigating environmental impacts.
Which of the following gases diffuses the fastest?
O2, CH4, CO2, Cl2
Answer is: CH₄ (methane).
The lighter (smaller) particles move more quickly than heavier (larger) ones at the same temperature.
Methane has smallest molecular mass in this example.
M(CH₄) = 16 g/mol; molecular mass of methane.
M(O₂) = 32 g/mol; molecular mass of oxygen gas.
M(CO₂) = 44 g/mol; molecular mass of carbon(IV) oxide.
M(Cl₂) = 71 g/mol, molecular mass of chlorine gas.
A balanced chemical reaction obeys the law of...
A) ideal gases.
B) definite proportions.
C) conservation of matter.
D) conservation of energy.
Answer: C
Explanation: It obeys the law of conservation of matter because you are putting the same amount of matter on each side of the equation.