why is it that a bell in a sealed bell jar can't be heard when a vacuum is created
Answers
A bell in a sealed bell jar can't be heard when a vacuum is created is because sound requires a medium, such as air, to travel through.
In a vacuum, there is no medium for the sound waves to propagate through, so the sound cannot be heard.
An explanation for this is that sound waves are essentially pressure waves, where vibrations in the medium (such as air molecules) create regions of high and low pressure that travel through the medium. In a vacuum, there are no molecules present to create these pressure waves, so sound cannot be transmitted.
the lack of a medium for sound waves to propagate through is the reason why a bell in a sealed bell jar cannot be heard when a vacuum is created.
Sound is a form of mechanical wave that travels through the vibration of particles in a medium, such as air, water, or solid materials. In a vacuum, there are no particles present for the vibrations to move through. When a bell is struck inside a sealed bell jar with a vacuum, the vibrations from the bell cannot be transmitted to the surrounding air particles, as there are none. As a result, the sound waves do not reach our ears, and we cannot hear the bell.
The absence of a medium in a vacuum prevents sound waves from transmitting, which is why we cannot hear a bell in a sealed bell jar when a vacuum is created.
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Related Questions
why decomposers play an important role in ecosystem
Answers
Answer:
They break down the bodies of dead organisms, to return the nutrients back into the soil
Answer:
They break down the bodies of dead organisms, to return the nutrients back into the soil
Explanation:
Which substance is associated with immunosuppression in shock? A. Glycogen B. Cortisol C. Renin D. Antidiuretic hormone.
Answers
D. Antidiuretic hormone.
Cortisol is a substance is associated with immunosuppression in shock. Option (B) is correct.
Cortisol is a hormone produced by the adrenal glands in response to stress. During shock, the body undergoes a significant stress response,
leading to the release of cortisol. Cortisol plays a crucial role in regulating the immune system. However, in high levels, it can have immunosuppressive effects.
During shock, cortisol levels rise as part of the body's stress response. High levels of cortisol can suppress the immune system, inhibiting immune cell function and reducing the body's ability to mount an effective immune response. This immunosuppression can leave the individual more susceptible to infections and impair the body's ability to fight against pathogens.
It's important to note that while cortisol has important regulatory functions in the body, excessive or prolonged elevation due to conditions like shock can have negative effects on the immune system.
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which two substances does the flavin cycle produce
Answers
In the Calvin cycle, NADPH and ATP formed in the light reactions lose their stored chemical energy to build glucose.
What is the number of nitrogen molecules that reacted with excess hydrogen to make 2 x 1010 molecules of ammonia?.
Answers
The number of nitrogen molecules that react with excess hydrogen to produce 2x10^10 ammonia molecules is 1×10¹⁰.
Stoichiometry is the calculation of a balanced chemical equation that determines the ratio between reactants and products in a chemical reaction.
Equilibrium in chemical equations obeys conservation principles and Dalton's model of the atom, such as the Law of Conservation of Mass, which states that:
mass of reactants = mass of products
In this sense, the equation must have equal weight on both sides of the equation.
In terms of reactions, both are in equilibrium 3H₂ + N2 ⟷ 2 NH₃
If 1 molecule of nitrogen produces 2 molecules of ammonia
2 x 10¹⁰ ammonia molecules will be produced if 2 x 10¹⁰ × 1/2= 1 × 10¹⁰ molecules.
So, the number of susceptible nitrogen molecules is 1 × 10¹⁰.
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Describe the action of cocaine at a synapse
Answers
Answer:
dopamine transporter, blocking the removal of dopamine from the synapse. Dopamine then accumulates in the synapse to produce an amplified signal to the receiving neurons
What are the main ways to build an earthquake proof building
Answers
The main ways to build an earthquake-proof building are as follows:
Buildings are built by reinforcing their external structures. It is important to resist crashes due to this, constructions must reorganize the energy that travels through them. Cross braces and shear walls are also implemented in the construction which increases the resistance to walls. What is an earthquake?An earthquake may be defined as a type of natural calamity or disaster that involves the violent shaking of the ground that is generally produced by the sudden movement of rock materials below the earth's surface.
Apart from the above ways, some other ways like the moment-resisting frames and diaphragms are also important to strengthen a building. This strength typically has the ability to prevent the effect of earthquakes up to certain intensities. Alarm and prior information devices are also built that indicate the arrival of earthquakes prior.
Therefore, the main ways to build an earthquake-proof building are well described above.
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Which of the following describes what occurs during inhalation?
Answers
Answer:
c. Ribs move out- diaphragm contracts- lungs expand- decrease intrathoracic pressure
Explanation:
Answer:
c
Explanation:
An architect is designing a recording studio for a musician. The studio needs to be soundproof
to keep out noise. The architect plans to use soundproof panels for the walls, ceiling, and floor.
Each soundproof panel is made from two sheets of hard foam with a vacuum in between
them, as shown in the diagram. Describe two ways the soundproof panel works to keep out
noise.
Answers
Answer:
I think the correct one is A
Explanation:
Please help me. :)
3. what is the independent variable : is the one that is being chanted, which is the baking powder,
what is the Dependent variable: is the variable affected by the change, which is if the cookies will rise more
2 things that must remain constant for this experiment, is the temperature of the room, and the baking powder (you could make these up, for example you could say they have to be made in the same environment,)
4. write a hypothesis for this experiment
if.....
then.....
because.......
Answers
The hypothesis must reflect the relationship between the independent and the dependent variables. If a higher amount of baking powder is used to make the cookies, they will rise more because more carbon dioxyde is released.
What are the variables involved in an experiment?Independent variableThis is the one the researcher changes to observe how this change affects the response of another variable.
Dependent variableThis is the variable that is affected by any change in the independent one. The dependent variable will respond by showing a change in its state.
Controlled variablesThese are all the remaining variables in an experiment that must be kept under control to avoid a potential effect on the results. Usually, there are several controlled variables and the researcher must keep them stable so they can not influence the dependent variable.
What is a hypothesis?The hypothesis is a prediction about what the researcher thinks might be going on or expects to occur.
It is a claim in which the researcher states a direct and clear relationship between the dependent and the independent variables.
Usually this relationship is a cause and consequence effect, so the way it is usually written is as follows,
"If.... (independent variable), then .... (dependent variable response)"
To answer the question, since I do not have a background, I will assume the following, (note: I advise you check if this assumption is correct with your problem statement)
The goal of the experiment is to see if the amount of baking powder used to make cookies will make them rise more.
Treatment groups: two cookie masses using two different baking powder quantities.
Control group: one cookie mass using no baking powder.
The same amount of water and the same amount and type of flour was used to prepare the three masses.
Treatment groups were exposed to the same type of baking powder.
The three masses were placed in a room under the same temperature.
Variables,
Independent variable ⇒ amount of baking powder (amount nº 1 and nº 2)Dependent variable ⇒ cookies rising Controlled variable ⇒ room temperature, water amount, flour amount and type, baking powder type, etcetera.Hypothesis: Here I propose two possible hypothesis with the same idea.
1)
If a higher amount of baking powder is used to make the cookies, they will rise more because more carbon dioxyde is released.
2)
If amount nº 2 of baking powder is used to make the cookies, they will rise more than using amount nº 1 because there is more powder acting on the mass.
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If you placed the celery into a bottle of colored water that was 35% sugar, would the colored water be seen in the celery? Why or why not?
Answers
Answer:
yes,The small "vessels" in the celery stalks carry the water and color to the leaves, like the way blood travels through your body.
Explanation:
adaptations in glut4 expression in response to exercise detraining linked to downregulation of insulin-dependent pathways in cardiac but not in skeletal muscle tissue
Answers
The downregulation of insulin-dependent pathways in cardiac muscle tissue during exercise detraining may result in decreased glucose uptake and utilization by the heart, which could have implications for overall cardiac function.
The statement suggests that adaptations in GLUT4 expression, in response to exercise detraining, are associated with a decrease in insulin-dependent pathways in cardiac muscle tissue but not in skeletal muscle tissue.
1. GLUT4 expression: GLUT4 is a glucose transporter protein that plays a crucial role in glucose uptake by cells. In response to exercise, GLUT4 expression increases to facilitate glucose uptake into muscle cells, promoting energy production.
2. Exercise detraining: Exercise detraining refers to the period of reduced or discontinued physical activity after a period of regular exercise. During this period, the adaptations gained from exercise may start to reverse.
3. Insulin-dependent pathways: Insulin is a hormone that regulates glucose uptake into cells. Insulin-dependent pathways involve insulin signaling and activation of various molecules that facilitate glucose transport into cells.
Based on the statement, here is a breakdown of the key information:
- In response to exercise detraining:
- GLUT4 expression decreases in cardiac muscle tissue.
- Insulin-dependent pathways are downregulated in cardiac muscle tissue.
- However, there is no change in GLUT4 expression or insulin-dependent pathways in skeletal muscle tissue.
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When Watson and Crick were constructing their model of DNA, they used all of the following information EXCEPT:
A. Linus Pauling's conclusion that hydrogen bonds held the bases together.
B. Chargaff's rules, that the amount of adenine equaled the amount of thymine and the amount of cytosine equaled the amount of guanine.
C. the width of the molecule, as determined by examining Dr. Franklin's X-ray crystallographic images.
D. the spiral nature of the molecule, determined by those same images.
E. Actually, they used all of this information.
Answers
Watson and Crick used all of the provided information, including LinusPauling's conclusion about hydrogen bonds, Chargaff's rules, the width of the molecule observed in Dr. Franklin's X-ray images, and the spiral nature of the molecule.
Watson and Crick utilized all of the mentioned information during their construction of the DNA model. Linus Pauling's conclusion about hydrogen bonds was crucial because it provided insights into the forces holding the DNA bases together. Chargaff's rules, which stated that the amount of adenine equaled the amount of thymine and the amount of cytosine equaled the amount of guanine, were fundamental for understanding base pairings within the DNA structure.
The width of the DNA molecule, determined by examining Dr. Franklin's X-ray crystallographic images, played a significant role. The X-ray images indicated that DNA had a consistent diameter, suggesting a helical structure. This observation supported the notion of a spiral nature for the DNA molecule, which Watson and Crick incorporated into their model.
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The mitochondria of a cell is the site for which two cellular processes?
Answers
Answer:Known as the “powerhouses of the cell,” mitochondria produce the energy necessary for the cell's survival and functioning. Through a series of chemical reactions, mitochondria break down glucose into an energy molecule known as adenosine triphosphate (ATP), which is used to fuel various other cellular processes.
Explanation:
Krebs cycle and electron transport chain
Answer:
The Krebs cycle and electron transport chain
Explanation:
The Krebs cycle takes place inside the mitochondria. The Krebs cycle produces the CO2 that you breath out. This stage produces most of the energy ( 34 ATP molecules, compared to only 2 ATP for glycolysis and 2 ATP for Krebs cycle). The electron transport chain takes place in the mitochondria.
How does the structure of the mitochondria enable such an increase of energy to be produced?
Answers
Where does the energy for most ecosystems originate? How is this converted into the energy in food?
Answers
Answer:
Explanation:
"Energy is transferred between organisms in food webs from producers to consumers. The energy is used by organisms to carry out complex tasks. The vast majority of energy that exists in food webs originates from the sun and is converted (transformed) into chemical energy by the process of photosynthesis in plants."
What are two abiotic and two biotic conditions in a coral reef that provide the conditions necessary for it to have high biodiversity?
Answers
Answer:
vbfxb
Explanation:
vgjjg
Wiping down hand rails with ethanol is best described as
A. sanitization.
B. sterilization.
C. disinfection.
D. antisepsis. The process of autoclaving bacterial growth media prior to use
A. sterilizes the media.
B. reduces the number of endospores.
C. kills all vegetative bacteria.
D. reduces the number of vegetative bacteria.
E. increases the media's nutrient value.
Answers
option (A) sterilizes the media is the correct answer.Wiping down handrails with ethanol is best described as disinfection.
Disinfection is a process that removes pathogenic microorganisms (but not necessarily all microbial forms) from inanimate objects. Ethanol is a common disinfectant that destroys most vegetative cells of bacteria, fungi, and viruses. Ethanol is known as a dehydrating agent, which removes water from cells and denatures their proteins. Sanitization refers to the process of removing dirt and dust from a surface. Sterilization refers to the process of destroying all forms of microbial life, including bacterial endospores. Autoclaving bacterial growth media prior to use sterilizes the media. Hence, option (A) sterilizes the media is the correct answer.
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What is the job of the cell membrane
Answers
Answer:
regulates the transport of materials entering and exiting the cell. In simpler terms, allows which materials can enter or exit the cell.
What type of cell does the HIV virus use as a host cell?
bone marrow cells
nerve cells
blood cells
CD4 cells
Answers
|| ▼ Answer ▼ ||
CD4 cells|| ✪ Explanation ✪ ||
The type of cell that HIV uses as a host cell by attacking and destroying such cell is called CD4 cells. It is a lymphocyte also referred to as T cells that is responsible for battling infections. Since HIV cannot reproduce on its own, it binds to a host cell which is the CD4 cell.
Hope this helps!
If you have any queries please ask. =)
Inventory inputs to MRP may include the following:
a. Lead times, safety stocks, and product structure trees.
b. Lead times, safety stocks, and amount of inventory on
hand.
c. Lead times, supply chain
Answers
The inventory inputs to MRP include lead times, safety stocks, and product structure trees.
Material Requirement Planning (MRP) is a system that is utilized for scheduling, planning, and controlling production processes. MRP assists businesses in maintaining ideal inventory levels, scheduling deliveries, and ensuring the efficient use of resources. It relies on various inventory inputs to function, and some of these inputs include lead times, safety stocks, and product structure trees.
Lead time refers to the time taken from the order of the material to the delivery of the material. This means the lead time involves the ordering, waiting, and delivery times. In MRP, lead times are important inputs since they enable the system to calculate the required materials, quantities, and timing needed to meet the production requirements.
Safety stocks are the extra stocks kept by a company to safeguard against unexpected situations like a surge in demand or unexpected delivery delays. In MRP, safety stocks are important inventory inputs since they help the system determine the ideal amount of inventory that the company should have on hand.
Product structure trees, also known as bills of materials, are documents that contain information on the components required for manufacturing a product. In MRP, product structure trees are important inventory inputs since they enable the system to calculate the quantities of raw materials required for production.
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A longitudinal wave moves energy that is_____ to the direction of the wave’s movement.
Answers
Answer:
The answer would be parallel to the direction of the wave's movement I believe :)
Answer:
parallel
Explanation:
e2021
4.
Which is found in a plant cell and not in an animal cell?
A
cytoplasm
В
glycogen granules
с
nucleus
D
starch grains
Answers
Answer:
Plastids, chloroplasts, and vacuoles are found in plant cells but not in animal cells.
Explanation:
1. Which of the following organisms would NOT display bilateral symmetry because of its feeding behavior?
A. a bee that collects nectar from flowers
B. a fish that follows its prey over a long distance
C. a filter feeder that eats food carried by currents
D. a crab that searches for debris on a beach
2. Perception of visual cues is essential for survival of most animals. A scientist analyzes the vision receptor molecule in invertebrates and vertebrates. The results show that the genes for opsin, the protein part of the photoreceptor, share strong homology in the regions that code for domains involved in light response. Which of the following conclusions is the MOST likely?
A. The receptor molecules will be structurally different but respond to the same light cues.
B. The receptor molecule will be similar in invertebrates and vertebrates because of convergent evolution.
C. The receptor molecules will be different because invertebrates and vertebrates perceive visual cues in different environments.
D. The receptor molecules will be similar in invertebrates and vertebrates because they appeared early in evolution.
3. A paleontologist identified two distinct species of mollusks in the fossil record of a region. In the layer below a mass extinction that devastated the region, the paleontologist observed that shells of species A was present in small numbers over a widespread area whereas species B was abundant and found in a few restricted areas. Which of the following predictions about the fossil record in the layer above the mass extinction is the MOST likely to be supported by further excavations?
A. Species A survived because of its widespread range including some areas that were not as affected by mass extinction.
B. Species A survived because the low number of individuals meant that there was less competition for resources.
C. Species B survived because it was the more abundant and more individuals survived.
D. Species B survived because the population was concentrated in a few areas and had a higher chance of survival.
4. Insects, birds, and bats can fly. Which of the following is a derived characteristic unique to birds and bats?
A. light body weight
B. modified limbs for flight
C. high metabolic rate
D. large surface of wings
Answers
C. A filter feeder that eats food carried by currents would not display bilateral symmetry due to its feeding behavior. D. Receptor molecules will be similar in invertebrates and vertebrates because they appeared early in evolution
What are the five bilaterally symmetrical organisms?Flatworms, common worms (also known as "ribbon worms"), clams, snails, octopuses, crustaceans, insects, spiders, brachiopods, sea stars, sea urchins, and vertebrates are a few examples of organisms possessing bilateral symmetry.
What kind of plant possesses bilateral symmetry?Family members of the pea and orchid are two examples of plants with bilateral symmetry. Phylum Platyhelminthes, Mollusca, Cnidaria, Arthropoda, etc. are some further examples.
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8. which thalamic nuclei are associated with pfc and motor cortices? what is the input to these thalamic nuclei that gets relayed to the cortex? how is this different from the relays to the visual, auditory and somatosensory cortex?
Answers
The mediodorsal nucleus is one of the thalamic nuclei linked with the PFC. The VL (ventrolateral) and VA (ventrolateral) thalamic nuclei are associated with the motor cortices (anteroventral).
The mediodorsal nucleus may receive input from the olfactory bulb and the amygdala. The basal ganglia and cerebellum may provide information for the anteroventral nuclei. This differs from relays to the visual, auditory, and somatosensory cortices in that...
The nucleus reunions (Re) and rhomboid nuclei of the ventral midline are also hypothesized to carry information between the prefrontal cortex and the medial temporal lobe.
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State TWO reasons why it is important to control the amount of body fat in the human body
Answers
Answer:
To maintain the right body temperature, it is essential to have adequate body fat. Body fats are the storehouses of energy in the body. Body fats are necessary to ensure the smooth functioning of cells. Body fats have a cushioning effect on organs and tissues.
how could a dog living now and a cat living thousands of years ago have in common
Answers
Answer:
They are both animals and both are mammals. I think that is what you mean.
Explanation:
John, a 20-year-old student, received a traumatic brain injury as the result of an auto accident in which he was texting while driving. When he was evaluated at the trauma unit at the hospital, his Glasgow Coma Scale score was 7. After his condition stabilized, John was referred to a rehabilitation center for ongoing management. Residual effects experienced from his injury are information processing difficulty and trouble with short-term memory.
Which level of brain injury did John experience based on the Glasgow Coma Scale score?
Answers
Traumatic brain injuries are classified by severity using the same scoring levels as adults, i.e. 8 or lower reflecting the most severe Patients with scores of 3 to 8 are usually considered to be in a coma.
The most used scoring method for determining a person's state of consciousness after a traumatic brain injury is the Glasgow Coma Scale (GCS). In essence, it is employed to determine the severity of an acute brain damage. The exam is straightforward, trustworthy, and has good correlations with recovery from serious brain damage. The GCS is a trustworthy and impartial technique to document a person's initial and continued state of awareness following a brain injuries. It is used by trained personnel in the emergency room and intensive care facilities as well as at the scene of an injury.Traumatic brain injury is the main cause of mortality and disability among kids between the ages of 0 and 4 and 15 and 19 years old, according to the CDC. According to studies, there are 691 paediatric TBI cases for every 100,000 kids.
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What makes up muscle tissue?
o organisms
O organ systems
O organs
Ocells
Answers
Answer:
cells
Explanation:
musscle tissue is made up of muscle cells
cells make up organs organs make up organs systems and organ systems make up organisms
Choose...
is the gradual change in living things over long periods
Extinction
Migration
evolution
Answers
What three major layers does rainwater touch in order to reach an aquifer?
Answers
Answer:
1.surface layer
2.zone of aeration
3.zone of saturation
Explanation:
Answer:
1. Surface layer
2. Zone of aeration
3. Zone of saturation
Explanation: