Answer:
D
Explanation:
Pure substance
When something could pose a danger, this could be a...
The distance between two crests of a wave is called
frequency
wavelength
troughs
quantums
Just study this, written down in my notes
Answer: wavelength
Explanation: a transverse wave, the molecules of a body move at right angles to the direction the wave travels, such as the ripples in a string. In a transverse wave, the distance between two crests (high points of a wave) is called the wavelength.
suppose a treadmill has an average acceleration of 0.05 m/s2. how much does its speed change after 45 seconds?
A body of mass 25kg, moving at 3 ms per second on a rough horizontal floor brought to rest after sliding through a distance of 2.5m on the floor. calculate the coefficient of sliding friction [g = 10.0 ms per second per second]
To calculate the coefficient of sliding friction, use the equation: frictional force = coefficient of sliding friction × normal force. Substitute the given values to find the coefficient of sliding friction.
Explanation:To calculate the coefficient of sliding friction, we can use the equation:
frictional force = coefficient of sliding friction × normal force
The normal force is equal to the weight of the object, which is given by the equation:
weight = mass × acceleration due to gravity
Substituting the given values, we can calculate the coefficient of sliding friction.
coefficient of sliding friction = frictional force / normal force
normal force = weight of the object = mass × acceleration due to gravity
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which of the following elements is the most reactive?
Beryllium
Calcium
Magnesium
Barium
Answer;
Barium
Explanation;
Group 2 metals get more reactive as we go down the group. The alkaline earth metals are the elements in Group 2 of the Periodic Table: beryllium, magnesium, calcium, strontium, barium, and radium. alkaline earth metals have low melting points and low densities for metals.
The decrease in reactivity down the group can be explained by the increase in ease at losing two outer electrons as we descend the group. The loss of electrons becomes easier due to the decreasing ionization energy required. Ionization energy decreases due to extra shielding from inner shells and increase in distance from the nucleus.
Answer: The correct answer is Barium.
Explanation: We are given some elements which belong to group 2 of the periodic table. These elements are considered as metals.
Reactivity of metals are defined as the ability of a metal to loose electrons easily.
In a periodic table, as we move down the group, the ability to loose the electrons increases and as a result, the reactivity of elements increases.
From the given elements, the last element which belongs to group 2 is Barium.
Hence, the most reactive element is Barium.
If a 65 kg student exerts a force with a magnitude of 100 N on a 100 kg desk The magnitude of the force that the desk exerts on him is
Answer:
100
Explanation: Answer for CK-12
Examples of tension force
In which type of government is power centralized?
During an investigation, a scientist heated 123.6 g of copper carbonate till it decomposed to form a black residue. The total mass of the black residue formed was 79.6 g. Does the law of conservation of mass hold true in this case? Use complete sentences to justify your answer based on numerical calculations.
When copper carbonate is heated, it decomposes to form a black residue. This black residue is actually copper(II) oxide. Along with this black residue, carbon-dioxide is released. The complete reaction is the following:
[tex]CuCO_3\to CuO(s)+CO_2(g)[/tex]
The law of conservation of mass holds true. 123.6 g of copper carbonate decomposes to 79.6 g of copper oxide and (123.6 g-79.6 g=44 g) 44 g of carbon-dioxide.
Answer:
The law of conservation of mass holds true.
Explanation:
123.6 g of copper carbonate decomposes to 79.6 g of copper oxide and 44 g of carbon-dioxide.
I got this right.
Why did scientists agree to use one system of measurement
Answer:
Scientists agree to use one system of measurement because by using same measurement system they can easily compare their data and result. By comparing data scientists can find the drawbacks of their research and they can modify their research.
Explanation:
If different countries has different measurement system or different scientist has different measurement system then they cannot compare the results of their experiment with each other. And it will be very difficult for them to share their knowledge.A research is successful when different scientist got same result by applying a particular method. In the absence of one system of measurement a research cannot be verified whether it is successful or not.
scientists agree to use one system of measurement because by using same measurement system they can easily compare their data and result. By comparing data scientists can find the drawbacks of their research and they can modify their research.
A ping pong ball with a dent in it can be put into a pan of boiling water. After a short amount of time, the dent will pop out. Determine the best reason for this occurrence. A) The ping pong ball plastic heats up and expands. B) The number of gas particles inside the ping pong ball increases causing more pressure. C) The gas particles inside speed up due to heat and cause an increase in pressure within the ball. D) Gas particles inside collide with each other less and with the ball more causing the dent to pop out.
) The gas particles inside speed up due to heat and cause an increase in pressure within the ball.
the answer is C the gas particles speed up
NEED HELP QUICK!!!!!!!!!
Which of the following provides evidence that supports the continental drift theory?
Fossils of the same organisms found in different continents
Magnetized rocks that do not match with the poles
Seafloor spreading
Volcanic activity
The answer is A
Your welcome
Answer:
A
Explanation:
Which of the following is a characteristic of the sun energy arrive on Earth A.it cannot travel through the air B.It cannot travel through space C.It is made up of rays of varying frequencies. D.It is made up of rays of the same wavelength
Answer:
C-it is made up of rays of different wavelengths
Explanation:
It is because the sun produces rays of different wavelengths
i
When used as a theatrical special effect to simulate fog, carbon dioxide gas tends to stay near the floor of the stage. What might account for this effect?
According to Freud which part of a persons personality is the largest
Final answer:
According to Freud, "the id is the largest part of a person's personality" because it encompasses instinctual drives and operates entirely in the unconscious.
Explanation:
According to Freud, the largest part of a person's personality is the unconscious, which includes the id, ego, and superego. While the ego operates in the conscious and serves as the mediator between the id and the superego, it is the id that forms the largest component, as it encompasses basic instinctual drives and is entirely unconscious. Freud's theory posits that the unconscious mind holds repressed memories and desires that significantly influence conscious behavior and personality development, with the id being a primary force driving pleasure-seeking behavior.
2. Which of the following is Not true about the noble gases? a. They have completely filled energy levels. b. They have weak intermolecular forces. c. They do not bond with other elements in nature. d. They have boiling points above room temperature.
The statement that is NOT true about noble gases is 'They have boiling points above room temperature.' Noble gases have low boiling and melting points due to weak London dispersion forces, they have filled energy levels, and they do not generally bond with other elements because of their stability.
Explanation:The statement that is NOT true about noble gases is 'd. They have boiling points above room temperature.' Noble gases, such as helium, neon, argon, krypton, xenon, and radon, have very low melting and boiling points.
This is due to the weak London dispersion forces that exist between the individual atoms. These weak forces can barely hold the atoms together which results in the low boiling and melting points.
Additionally, noble gases have completely filled energy levels and are stable, leading to the fact they rarely bond with other elements in nature. This stability is responsible for their name 'noble' as they are 'above' interacting with others, similar to nobility. So, the statements 'a. They have completely filled energy levels', 'b. They have weak intermolecular forces', and 'c. They do not bond with other elements in nature' are all accurate.
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During which time period was the acceleration of the car the greatest Question 10 options: 3-5 seconds 5-8 seconds 2-3 seconds 0-2 seconds
Needs more information I think.
Its 2-3 Seconds
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Jesse travels 3.0 meters east and then turns and travels 4.0 meters north. Which of the diagrams below illustrates his displacement
Answer: The second diagram.
Explanation:The arrow of the 3meters journey rests underneath the tail of the 4meters journey, and are both joined by the resultant 5meters vector joining the tail to the arrow
What happens when sunlight is passed through a prism?
The correct option is C. Visible light separates into different colors.
What is Prism?When light enters a prism, it bends. As a result, the various hues that make up light are divided. This is because every color has a unique wavelength that bends at a particular angle.
The seven primary colors of light are only dispersed through prisms as a conduit. Refraction takes place as light reaches the prism.
The prism's differing velocities cause these deviating colors' diverse wavelengths and frequencies to deviate in different ways at various angles.
Therefore, The correct option is C. Visible light separates into different colors.
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Quartz has an index of refraction of 1.46. Diamond has in index of refraction of 2.42. In which material does a light ray entering from air slow down more?
a greyhounds velocity changes from 10 meters per second to 15 meters per second in 0. 5 second. What is the greyhounds average acceleration?
5 m/s^2
10 m/s^2
10 m/s
15 m/s
Does anyone know a word (Not an energy btw) that means "Energy is transformed from one type to another?"
If so, I will give you brainliest and 40 points.
the change in elevation from one contour line to the next is called the
The pituitary gland releases chemicals known as?
Answer: Endorphins
Explanation:
The pituitary gland releases chemicals that are called as endorphins. These are the polypeptides which are made by the pituitary gland as well as the central nervous system. These are a kind of hormone which helps in dealing with the situations of stress and reduces the pain.
The pressure effect associated with the hormone endorphins is the part related to the increase in concentration of the dopamine production due to the activity of endorphins.
X-rays are used instead of visible light because X-rays have shorter ______________ than visible light, allowing them to produce images of much greater detail.
i think it might be wavelengths.. but don't quote me on that
Which tool would you use to measure the amount of rainfall
Why does light refract when it encounters the glass in the lens
the answer is B. because it slows down, which causes it to bend
Which of the following provide evidence for the theory of plate tectonics? Check ALL correct answers.
A) Land forms such as mountains have similar ages and composition despite being separated by oceans
B) Fossils of tropical plants have been found in northern Canada
C) Fossils of the fresh water reptile Mesosaurus are found in South America and Africa
D) Rock evidence of mountains on separate continents that match
E) Outlines of the continents fit together like puzzle pieces.
F) Sea floor spreading
Final answer:
Evidence for plate tectonics includes similar landforms across continents, the distribution of fossils in disparate geographic areas, the fit of continental outlines, and the process of sea floor spreading.
Explanation:
The evidence for the theory of plate tectonics is multifaceted and includes geologic, paleontologic, and morphologic observations:
Land forms such as mountain ranges that have similar ages, composition, and structure despite being separated by oceans are evidence of plate tectonics. For example, the Appalachian Mountains in North America are geologically similar to mountain ranges in Greenland and Europe, suggesting that they were once connected.Fossils provide evidence for plate tectonics. For instance, fossils of tropical plants found in northern Canada indicate that the area was once located in a different climate, possibly closer to the equator, before the plates shifted. Additionally, the presence of the freshwater reptile Mesosaurus' fossils in both South America and Africa suggests these continents were once joined.The complementary fit of the continental outlines, much like puzzle pieces, supports the idea that continents have drifted apart over time.Sea floor spreading is a process observed at the mid-ocean ridges, where new crust is generated and pushes plates apart, providing direct evidence of tectonic movements.By piecing together this evidence, scientists have been able to support the framework of plate tectonics, providing a comprehensive explanation for continental drift and the dynamic nature of the Earth's surface.
what is the energy that moves your arms and legs
What is the best explanation of the importance of the Second Amendment?
A. People accused of a crime need to be able to speak in their defense.
B. If people cannot talk about policies, they cannot change them.
C. People in the military should have the right to vote in elections.
D. People need to have the ability to protect themselves and their homes.