Answer:
80 dB
Explanation:
Sound intensity is inversely proportional to the square of the distance traveled by the sound.
Thus;
r1^2 divide by r2^2 = L2divideL1
where r= distance (m)
L= sound intensity (decibal dB)
8squared divide by 4 squared = L2 divide 20 dB
L2 = 4 × 20
L2= 80 dB
This means that the sound is increased from 20 dB to 80 dB.
Answer:
The answer to the question above is explained below
Explanation:
The loudness or sound intensity of the roaring truck engine is inversely proportional to the square of the distance.
r1^2 / r2^2 = L2/L1
Where, r1 and r2 = old distance and new distance respectively,
L1 and L2 = old sound intensity and new sound intensity respectively.
From the parameters given above,
r1=8m
r2=4m
L2=?
L1= 20dB
8^2 / 4^2 = L2 / 20 dB
L2 = 80 dB
The answer is 80 dB. Increased from 20 dB.
Decibel (dB), is a relative unit of measurement used for expressing the ratio between two physical quantities, usually electric power, or for measuring Sound intensity. Decibels measure the ratio of a given intensity to the threshold of hearing intensity.
Sound intensity, also known as acoustic intensity, is a vector describing the intensity of a sound is proportional to its amplitude squared.
Some cancers are caused by mutations that stop certain proteins from working. The inactivation of what kind of protein could lead to cancer? A. One that slows down the cell cycle. B. One that acts as a growth-reducing molecule. C. One that responds to growth-promoting molecules. D. One that speeds up the cell cycle.
Answer:
Some cancers are caused by mutations that stop certain proteins from working. The inactivation of what kind of protein could lead to cancer?
One that speeds up the cell cycle.
Explanation:
If the parents of a child are blood types AB and O, what are the possible blood types of the child?
a) A or B
b) A only
c) O
d) AB
H-shaped area of the spinal cord is called _________ matter and it is located around the ________________ filled with cerebrospinal fluid.
Answer:
The correct answer is "grey; central canal".
Explanation:
Grey matter refers to an area of the brain, brainstem and cerebellum comprised of unmyelinated neurons and other cells that has given its name for having a pinkish-grey color in the living brain. Grey matter is also present in the spinal cord in an are of three grey columns that are H-shaped and it is located around the central canal filled with cerebrospinal fluid
The H-shaped area of the spinal cord is called gray matter and it is located around the central canal filled with cerebrospinal fluid (CSF). The gray matter contains cell bodies and interneurons and is subdivided into regions known as horns.
Explanation:The H-shaped area of the spinal cord is called gray matter. This area contains cell bodies and interneurons and has a shape reminiscent of a bulbous capital 'H'. The gray matter is subdivided into regions known as horns. The gray matter surrounds a central canal filled with cerebrospinal fluid (CSF). This hollow center, a very small central canal through the cord, develops from the rest of the neural tube and corresponds to open spaces within the brain known as the ventricles, which are also filled with cerebrospinal fluid.
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The current eccentricity of Earth is .017. The shape of the Earth's orbit changes from being elliptical (high eccentricity) to being nearly
circular (low eccentricity) in a cycle that takes between 90,000 and 100,000 years. When the orbit is highly elliptical, the amount of
insolation received at perihelion would be on the order of 20 to 30 percent greater than at aphelion. What would be the predicted
result of this change?
The awnser is “A much warmer climate than what we are currently experiencing”
Answer:
In the given case, a much warmer climate will be experienced in comparison to what one is experiencing at the present time.
Explanation:
When the orbit of the Earth changes its path, one can witness a variation in the Earth's climatic conditions. Like when the Earth comes nearer to the Sun, the climate of the Earth becomes warmer. However, when the axis of the Earth shifts slightly away from the Sun, one can witness a reduction in the Earth's temperature.
Therefore, in the given case, the isolation received at perihelion would be twenty to thirty percent more in comparison to aphelion when the orbit is more elliptical, this condition eventually results in a warmer climate.
Question on edmentum for earth and space science B:
The graph shows how the eccentricity of Earth’s orbit increases and decreases in a somewhat predictable pattern. Read and interpret the data in the graph. Approximately how long does it take for Earth’s eccentricity to complete a cycle from one crest to the next)?
a graph showing eccentricity variation with time; eccentricity fluctuates between a maximum of 0.05 at 225,000 years ago to a minimum of 0.005 at 375,000 years ago
Explanation/ sample answer is : This cycle takes approximately 100,000 years to complete.
A student set up an experiment to show the effect of light color on photosynthesis in Elodea plants. She filled three test tubes with distilled water and placed a piece of Elodea in each of the tubes. She added a drop of phenol red, which turns red in a basic solution and yellow in an acidic solution. She blew in each tube to add carbon dioxide, which caused the distilled water to become more acidic so the phenol red turned yellow. She exposed Tube A to white light, Tube B to green light, and Tube C was wrapped in aluminum foil. Which of the tubes should she expect to turn red the fastest?
Answer:
Tube A will turn red the fastest.
Explanation:
Tube A will turn red fastest because Elodea plants will take up the white light and carry out photosynthesis.In tube B, the red colour will not be generated fastly because plants do not use green light. Usually, the green light is just reflected by the plants and it is not absorbed.
In tube C, no photosynthesis will be able to occur because due to the wrapped aluminium foil the plants could not receive any light for photosynthesis.
From the setup of the experiment to show the effect of light color on photosynthesis in Elodea plants, the solution in Tube A should turn red the fastest.
White light is essentially a mixture of all light colors. Hence, the Elodea plant in Tube A will absorb the most effective light color from the white light for its photosynthesis, utilizing the carbon dioxide in the tube's solution faster and making it turn red.
Green light is generally considered to be the least efficient of all light colors when it comes to photosynthesis. Hence, the rate of consumption of carbon dioxide from the tube with green (Tube B) light would be slow.
There will not be any photosynthesis in Tube C because there is no light for the process. the aluminum foil would have blocked any form of light that could get to the plant in the tube.
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How does fever indicate that your body's immune system is doing its job?
Answer:
Fever can support the immune system's attempt to gain advantage over infectious agents, such as viruses and bacteria, and it makes the body less favorable as a host for replicating viruses and bacteria, which are temperature sensitive.
Explanation:
Is rainfall a density-dependent or density-independent limiting factor?
Question 3 options:
density-independent
density-dependent
Describe the relationship between the two vocabulary terms given.
Dominant and Recessive
Answer:
The dominant trait is the trait that will overpower the recessive trait. Example: A brown eyed parent and a blue eyed parent will most likely have a brown eyed baby because brown eyes are dominant and blue eyes are recessive. Recessive traits can only happen if the other parent also is recessive or if the other parent is heterozygous recessive.
Explanation:
which action is a reflex action?
A) Asking for coffee in a cold climate
B) Blinking when lights flashed in the eyes
C) Drinks water when thirsty
D) Swallowing food
E) Taking an exam
Answer:
B. Blinking when lights flashed in eyes
Explanation:
This is a reflex action because blinking when there is light in your eyes is a reflex to protect your eyes.
Through the use of the Polymerase Chain Reactions (PCR), small amounts of DNA
A. can pair with complementary sticky ends of cut segments.
B. can be amplified in volume to result in many copies of the segment.
C. can be cut in specific locations to isolate DNA sequences.
D. can be sorted and mapped.
Answer:
B. can be amplified in volume to result in many copies of the segment.
Explanation:
The purpose of PCR is to amplify small amounts of DNA so that you can get a sample large enough to analyze (or use for some other purpose), especially in a crime scene. A. is referring to restriction enzymes, enzymes that cut at specific locations along DNA strands to create "sticky ends." C. is referring to restriction enzymes once again. D. is simply irrelevant.
Through the use of the polymerase chain reactions (PCR), small amounts of DNA can be amplified in volume to result in many copies of the segment. Thus, the correct option is B.
What is Polymerase Chain Reaction?The polymerase chain reaction is a method widely which is used to rapidly make millions to billions of copies of a specific DNA sample, it also allows the scientists to take a very small sample of DNA and amplify it to a large enough amount to study in detailed study.
Polymerase chain reaction is fundamental to many procedures which are used in genetic testing and research work, including the analysis of ancient samples of DNA and identification of infectious agents as well. In this process, small amounts of DNA can be amplified in volume to result in many copies of the segment.
Therefore, the correct option is B.
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all i need to ask is in the picture above
Answer:
number 1
Explanation: it is nature, when one feels threatened they want to make themselves as unapproachable as possible and for comfort, it also eases ones mind to know that if something happens to them, that they will not be alone
Stomach cells are moderately well adapted to the acidity and protein-digesting activities in the stomach by having _____.
Which of the following statements about the cytoskeleton is false? Group of answer choices The cytoskeleton is an elaborate series of rods throughout the cytosol. Once laid down, the elements of the cytoskeleton are fixed and remain permanently in place. The cytoskeleton helps organize the cell’s structure and activities The cytoskeleton is composed of three types of fibers: microfilaments, microtubules, and intermediate filaments. Next
Answer:
Which of the following statements about the cytoskeleton is false?
The cytoskeleton helps organize the cell’s structure and activities
Explanation:
The false statement about the cytoskeleton is Once laid down, the elements of the cytoskeleton are fixed and remain permanently in place.
The second option is correct
what is the cytoskeleton ?The cytoskeleton is described as a dynamic structure that is constantly being remodeled. The elements of the cytoskeleton can be broken down and reassembled, and they can also move around the cell. This allows the cytoskeleton to adapt to the changing needs of the cell.
The cytoskeleton is an elaborate series of rods throughout the cytosol.
The cytoskeleton helps organize the cell's structure and activities.
The cytoskeleton is composed of three types of fibers: microfilaments, microtubules, and intermediate filaments.
Therefore, The second option is correct
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compare circulatory systems of the earthworm, frog, and squid. Include information on major organs and vessels, blood transfer process, how the systems are similar, and how the systems differ. Explain the differences in terms of structure and environment.
Answer:The frog and squid have similar structure while the earthworm differs
Explanation:
The earthworm has two ventricles while the latter have one ventricle each
Earthworm can't survive in water but the others can survive on land and in water
Why does secondary succession occur faster than primary succession?
Answer:
Soil with nutrients is already present. Seeds are present from earlier occupants, brought in by wind, and/or germinate after fire.
Explanation:
Sample answer hope this helps!!! Brainliest?
Secondary succession usually occurs faster than primary succession because the components are already present. whereas in primary succession, there is no soil and it needs to form.
as pioneer species must inhabit the area, they must die, and as this happens repeatedly, soil formations take place.
What is Ecological Succession?Ecological succession is the process by which the mix of species and habitats in an area varies over time. Gradually, these communities replace one another.
Thus, Secondary succession usually occurs faster than primary succession.
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10. Sexual reproduction is believed to have
evolved originally as a way for cells to
a. shuffle genetic material.
b. repair damaged DNA.
c. produce diploid individuals.
d. increase their population growth at a
maximum rate.
Answer:
A
Explanation:
A drug that restricts the activity of angiotensin converting enzyme (ACE) would likely result in all of the following physiologic changes but one. Which of the following is the least likely to result from a drug blocking ACE activity?
Rock is a type of Earth material. Most rock is made up of _______.
Answer:
Rock is a type of Earth material. Most rock is made up of minerals.
Hope this helps you
A scientist is observing a onion cell and a human cheek cell under a microscope which observation does she MOST LIKLEY make A) The onion cell have lysosomes, and the cheek cell does not B) The cheek cells have larger vacuoles than the onion cells C) The cheek cells have a nucleus, and the onion cell does not D) The onion cells have a cell wall, and the cheek cells do not
Final answer:
The primary observation a scientist would make is that onion cells, which are plant cells, have a cell wall for structural support, unlike the cheek cells of humans that lack a cell wall.
Explanation:
A scientist observing an onion cell and a human cheek cell under a microscope will most likely make the observation that the onion cells have a cell wall, and the cheek cells do not. This is because onion cells, being plant cells, have a rigid cell wall surrounding their cell membrane which provides structural support and protection. In contrast, human cheek cells, like all animal cells, lack a cell wall and instead only have a cell membrane which is flexible and allows for a variety of shapes.
The structure labeled “A” in this diagram of a virus is called the
a. RNA envelope
b. Capsid
c. Nuclear membrane
d. Viral genome
The structure labeled “A” in this diagram of a virus is called the b. Capsid. Therefore, b. Capsid is correct .
The capsid, a crucial component of viruses, serves as a protective protein shell enveloping the viral genome.
Comprising subunits known as capsomeres, the capsid exhibits diverse structural forms, such as icosahedral, helical, and enveloped.
The icosahedral shape, with 20 triangular faces, is a common configuration, offering stability and efficiency in encapsulating the genetic material.
Capsomeres possess the unique ability to self-assemble, forming the capsid that shields the viral genome from external threats and damage.
Additionally, the capsid plays a pivotal role in facilitating the virus's attachment to host cells, a crucial step in the infection process.
Some viruses boast an additional layer beyond the capsid, known as the RNA envelope.
This outermost layer, though not labeled in the diagram, comprises a lipid bilayer studded with proteins.
The envelope serves several functions, including aiding the virus in evading the host's immune system and facilitating the virus's entry into host cells.
This membrane-like structure enhances the virus's adaptability and interaction with the host environment.
It's essential to note that the nuclear membrane mentioned is distinct from the viral components.
The nuclear membrane surrounds the nucleus in eukaryotic cells, providing a boundary between the nucleus and the cytoplasm.
The viral genome, on the other hand, represents the genetic material of the virus, not a membrane.
These structural elements is fundamental to deciphering the intricacies of viral infection and host interactions in various biological contexts.
What is the shape and arrangement of neisseria gonorrhoeae
Answer:
Bean shaped diplococci
Explanation:
Typically Neisseria gonorrhea is bean-shaped and present in the form of pairs. Because they present in the form of pairs called diplococci.
Aquatic biomes can be distinguished by chemical characteristics such as dissolved oxygen content and salinity and by physical characteristics such as water flow. Which five of the following statements about aquatic biomes are true?
Answer:
which five?
Explanation:
PLEASE HELP BIG POINT
Answer:
a
Explanation:
There are two major differences between mitosis and meiosis. First, meiosis involves not one, but Two cell divisions. Second, meiosis leads to the production of germ cells, which are cells that give rise to gametes. Germ cells are different from somatic cells in a critical way. Whereas somatic cells are diploid, meaning they have two copies of each chromosome, germ cells are haploid. The haploid nature of germ cells is vital to the process of sexual reproduction.
Answer: B
Explanation:
What type of succession shown from figure a to figure b
PLeASe ASAP !!!!
Answer:
The correct answer is secondary succession.
Explanation:
A slow process by which ecosystems develop and modify with time is termed as ecological succession. An array of community modifications that occurs on a previously colonized, however, damaged or disrupted habitat is termed as the secondary succession. Secondary succession takes place in the regions which were cleared of the prevailing vegetation or due to the catastrophic incidents like fire.
The phenomenon of secondary succession generally takes place at a rapid rate in comparison to the primary succession. This takes place because of various reasons like the undisturbed root systems present in the soil that helps the plants to regenerate at a quick rate, a prevailing seed bank of suitable plants in the soil, and the structure and fertility of the soil that would have been modified significantly by the species that were present in the previous colony, making the soil more appropriate for growth and development.
Which describes the organs in the human body
Answer: A group of tissues that work together to perform a common function.
Explanation:
What is the volume of the golf ball? Cm3
Answer: it’s 40cm3
Explanation: just had that question
The volume of a typical golf ball is about 41.63 cm³. The Volume of golf ball is calculated by V = 4/3 (π) r³
What is golf ball?A round, spherical white ball, used to play golf is called golf ball. According to the rules of golf, a golf ball should have mass no more than 1.620 oz (45.9 g), has a diameter not less than 1.680 inches (42.7 mm).
There are two categories of golf ball:
recreational ballsadvanced ballsRecreational balls are oriented towards the golfer who has low swing speed, and have low prices than advanced balls. to calculate volume of golf ball, you can calculate the volume of a sphere by knowing its radius. To compute the volume of a golf ball, we take the radius of it and multiply it by the volume of a sphere. Formula to be used:
V = 4/3 (π) r³
Therefore, volume of typical golf ball is calculated by using V = 4/3 (π) r³.
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He was not satisfied with command of his native language merely, but gave attention to the study of foreign ones, and in particular was a master of Latin that he could speak it as well as his native tongue; but he could understand Greek better than he could speak it. He was so eloquent . . . The King spent much time and labour with him studying rhetoric, dialectics, and especially astronomy; he learned to reckon, and used to investigate the motions of the heavenly bodies most curiously.
This passage exemplifies Charlemagne's enthusiasm for
Answer:
Explanation:
Language is the answer trust me
Answer:
Language
Explanation:
i just took the test
Select the scientific questions that are testable.
How many people live in an area
prone to earthquake?
To what extent has climate changed
over the past 100 years?
What career should I pursue after
graduate?
What gives a person's life meaning?
What gases make up the
atmosphere of Earth?
Should the use of coal and other
fossil fuels be banned?
What are the effects of high winds
during a hurricane?
How long does it take water to
freeze?
Why should we value the
environment?
Should mining for phosphates be
stopped?
Answer:
How many people live in an area prone to earthquakes?
To what extent has climate changed over the past 100 years?
What gases make up the atmosphere of earth?
What are the defects or high winds during a hurricane?
How long does it take water to freeze?
What are the four levels of organization in an organism?
Answer:
Cell, Tissue, Organ, Organ system
Explanation:
A group of cells makes up a tissue, A group of tissues makes up an organ and a group of organs makes up an organ system.
Describe the relationship between DNA, Chromosomes, and Genes
Answer:
they are all located in the nucleus
Explanation:
Answer: DNA carries instructions for making the proteins a cell needs.
DNA molecules are found in chromosomes.
Genes are segments of DNA that contain instructions that code for proteins.
Explanation:
Just did it on edge 2020 i hope this helps you.