Since forces cause a change in motion or state of a body, friction is a force which opposes motion of an object over another.
What is frictional force?Frictional force or friction is the force that opposes the relative motion of one object over another at their surface of contact.
The two types of friction are:
static friction andkinetic frictionRough surfaces experience the greatest friction while smooty surfaces experience the least friction.
Hence, friction can be reduced by lubrication or polishing.
Based on the property of forces and friction:
Force is defined as a push or pull that starts, stops or changes the direction of a moving object.Friction is a force that opposes motion between two surfaces sticking or touching together.A sandy floor has the greatest frictional force among these surface.Friction is a force that opposes motion. It acts in the opposite direction of a moving object. Friction is a force that occurs when surfaces touch each other. Rolling friction is produced when an object rolls over a surface is produced.Rolling friction is produced when an object is rolled on a surface. Round objects like a Ball produces rolling friction.Riding a bicycle and using of wheelbarrow (kariton) are examples of rolling frictionA soccer ball rolling on the ground is an example of rolling friction.Sliding friction occurs between moving objects and a liquid or between an object moving in the air.Static Friction occurs when there is more force needed to travel an object in a surface than rolling Friction.A train going around its tracks is rolling frictionSliding friction opposes the sliding of objects over a surface.Mucus produced by snails, help them move along the ground because Mucus reduces friction.Therefore, it can be concluded that generally, friction opposes motion of an object over another.
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Why does the moon have craters in it?
Answer:
Because the Earth has an atmosphere, the Moon has more craters than the Earth. While we sweep up a lot more things because of our higher gravity, the majority of it burns up on entrance and never reaches the earth. Earth also possesses liquid water. This is significant in two ways: first, most things that strike water do not create a crater, and second, water erodes previous craters.
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Which cell wall is the furthest form the plasma membrane in plants
Answer:
Below
Explanation:
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Cell wall
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Outermost layer of the cell wall is
(A)Plasmalemma
(B)Secondary wall
(C)Middle lamella
(D)Primary wall
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Hint: The wall which is present at the outermost of the cell wall acts as a glue between the different cells. . The secondary wall is not present in every cell, it is present in few cells that alter the growth of the primary wall.
Complete answer:
A cell wall is an outer structural layer present in only some types of cells, just outside the cell membrane. It is usually tough, flexible, and sometimes rigid. The cell wall is mostly composed of two layers and sometimes three layers too. The layers of the Cell wall are as follows-
- The primary cell wall is generally a flexible thin, and an extensible layer formed while the cell is growing i.e not fully developed. It is usually made up of cellulose and it is often permeable too.
-The middle lamella, a layer rich in pectins. It is the outermost layer that forms the interface between adjacent plant cells and glues them together.
-The secondary cell wall, if present, is a thick layer formed inside the primary cell wall after the cell is mature. it's not found in all cell types.
Additional Information: The cell wall is majorly composed of the cellulose microfibrils that are linked via hemicellulosic tethers to form the cellulose-hemicellulose network, which is embedded in the pectin matrix. The most common hemicellulose present in the primary cell wall is xyloglucan.
The outer part of the primary cell wall of the plant epidermis is mostly covered with the cutin and wax, forming a permeability barrier known as the plant cuticle.
Secondary cell walls contain a wide range of additional compounds that helps to enhance and modify their mechanical properties and permeability. The major polymers that make up wood (largely secondary cell walls) include cellulose, 35-50% .xylan, 20-35%, a type of hemicellulose, and lignin, 10-25%.
The cell wall which is the farthest from the plasma membrane in plants is the primary cell wall.
What do you mean by Cell wall?A Cell wall may be defined as a specialized form of the extracellular matrix that surrounds every cell of a plant. It is made up of cellulose.
The primary cell wall is the outermost cell wall in the plants, while the secondary cell wall is the innermost cell wall in the plant cell.
The secondary cell wall is located near the plasma membrane, while the primary cell wall is located farthest from the plasma membrane.
Therefore, the cell wall which is the farthest from the plasma membrane in plants is the primary cell wall.
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Why is the coral snake venomous?
Answer:
Coral snake bites can be extremely painful and can cause muscular paralysis. The coral snake's venom is one of the most potent venoms in the animal world because it contains powerful neurotoxins. The neurotoxins are responsible for the rapid paralysis and respiratory failure in the coral snake's smaller prey.
Explanation:
Keep in mind what an independent variable is. What are some variables that can affect a person’s heart rate? Choose one variable that you would like to design an experiment for. State your hypothesis of how the independent variable might affect heart rate. Please be specific about what the independent variable is.
Here the experiment is on heart rate of a person
Controlled Variable:
TimeExplanation:
Both shall workout for the same time.Measure their heart rate and see who's heart rate is higher.Independent Variable:
AgeExplanation:
Age is different for everyone and independent.Make them workout for the similar amount of time then measure their heart rate.Older person will have greater heart rate.=================================================================
The person with less heartbeat means he has a great fitness.The person with greater heartbeat means he has a bad fitness.1) Water is one of the required reactants for photosynthesis. It provides electrons that are energized by sunlight and used to make energy carriers like ATP. Where do plants get the water they need for
photosynthesis?
Answer: Plants get water from the soil their roots are embedded in.
Explanation: Photosynthesis can be defined as the process by which the the autotrophs make food with the help of carbon dioxide and water.Water provides electrons,these electrons are energized by sunlight and used to make ATP.The plants get water from the soil. The water in the soil is absorbed by the roots of the plant that is transported to the leaves for photosynthesis.hence, the answer is soil.
What is one possible result of a mutation within a start codon? A stop codon?
The result of a mutation within a start codon is the non-start of the protein translation, whereas a mutation in the stop codon will long the length of the protein.
What are transcription and translation?Transcription refers to the process by which a fragment of DNA is used as a template to create an RNA molecule, usually a messenger RNA.
Subsequently, this mRNA sequence can be used to create a protein by a process called translation.
The triplets of nucleotides (codons) in the mRNA are read by the ribosomes during translation, thereby a mutation in the start codon would produce a nonfunctional mRNA.
Moreover, a mutation in the stop codon will long the length of the resulting protein sequence.
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Answer questions at top for 40ps
Scientists have studied the return of plant life on Mount St. Helens ever since the volcano erupted in
1980. Wildflowers began colonizing the area, followed by shrubs and small trees. Scientists predict
that it will likely take hundreds of years before the area returns to a forest dominated by fir and
hemlock trees. These changes are an example of:
a. humans degrading an ecosystem by removing wildflowers
b. the loss of genetic variation in a plant species
C. the growth of a forest through ecological succession
d. the biological evolution of wildflowers, shrubs, and trees
Answer:
C.
The ecosystem there will definitely go through ecological succession by which the structure of the flora there will evolve over time into forests.
Plants are ? They make their own food.
Animals are? They consume other organisms for food
Answer:
Plants are producers.
Animals are consumers.
If a cell becomes freely permeable to sodium ions (na ) and is not regulated, what will be the resulting membrane potential?
Since their are more sodium ions outside the cell at test, if a cell becomes freely permeable to sodium ions and is not regulated, the membrane potential will be positive.
What is membrane potential?The membrane potential is the potential difference across a neuronal membrane due to the difference in the concentration gradient of oppositely charged ions.
At rest, the inside of the membrane is negative while outside is positive due to more sodium ions being outside the cell.
Therefore, if a cell becomes freely permeable to sodium ions and is not regulated, the membrane potential will be positive.
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If a substitution of one nitrogen base for another nitrogen base occurs in this change has no effect on amino acid being called for this would be known as a
Answer:
Point mutation
Explanation:
Since it does not alter the amino acid, it would be a point mutation (unless if it did change the amino acid, it would be a frameshift mutation).
In towns and cities, generally, the bore wells have to be dug very deep to get water as compared to bore wells dug in villages. Give suitable reasons.
Answer:
nice English and I'm good morning
Can u help me
I need
Answer:
the first one would be DNA replication.
the second one would be Segregation
the third is Cytokinesis
and the last should be Binary Fission
This time period allowed for great advancements in technology and human health but it also led to many environmental problems. 5c
Group of answer choices
agricultural revolution
american revolution
industrial revolution
paleolithic era
Answer:
C. Industrial Revolution
Explanation:
Took the test ;)
Also, the new machines in the industrial revolution helped human health and of course, advanced technology but the machines and the mining harmed the environment.
Which of the following is a characteristic of all mammals? Question 4 options: lungs hair tail both 1 and 2.
Answer: both 1 and 2
Explanation: common sense
Both 1 and 2 are a characteristic of all mammals.
What are the characteristics of mammals?Characteristics of Mammals are:
The presence of hair or fur.Sweat glands.Glands are specialized to produce milk, known as mammary glands.Three middle ear bones.Specialized teeth.A four-chambered heartThus, Both 1 and 2 are a characteristic of all mammals.
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Question 1
the biological classification of organisms is called taxonomy. based on your own investigation, discuss
the importance of taxonomy in biological research.
Answer:
It helps to ascertain the number of living beings on earth.
Explanation:
More than one million of species of plants and animals have been discovered and classified so far. It aims to classify the living organisms. Millions of organisms are classified scientifically in categories, which helps to have a better understanding.
Which of the following statements best explains the pattern seen on the gel with regard to the size and charge of the molecules? Circle all that are correct.
Molecules A and B are positively charged, and molecule A is smaller than molecule B.
Molecules A and B are negatively charged, and molecule A is smaller than molecule B.
Molecules C and D are positively charged, and molecule C is larger than Molecule D.
Molecules C and D are negatively charged, and molecule C is smaller than Molecule D.
The following statement best explain the pattern of seen on the gel electrophoresis.
Molecules A and B are positively charged, and molecule A is smaller than moleculeWhat is gel electrophoresis?Gel electrophoresis is a laboratory technique that is used to separate combinations of DNA, RNA, or proteins base on their molecular size. In gel electrophoresis, the molecules to be separated are put and push forward by an electrical field through gel that that have small pores.
Therefore, The following statement best explain the pattern of seen on the gel electrophoresis.
Molecules A and B are positively charged, and molecule A is smaller than molecule.Learn more about gel electrophoresis here.
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The _____ theory is the theory of color vision that suggests three types of cones in the retina each make a maximal chemical response to one of three colors: blue, green, or red.
Answer:
It's the Trichromatic theory
Explanation:
Sun-->sagebrush-->jackrabbits-->coyotes
What would happen to this ecosystem if the amount of coyotes increased? plsss tell me
Answer:
there would be less jackrabbits, more sagebrus, and the coyotes would have less food leading them to death
Explanation:
what i said
the genetic makeup of a species is called-
the genetic variation that exists between a species is called-
the diversity of ecosystems, communities, and habitats is known as-
Answer:
i put makeup of my dog and on my cow i love to jump over the sun for joy
Explanation:
During translation, the peptide bond formation is catalyzed by:.
Answer:
RNA (referred to as a ribozyme)
Explanation:
Which statements about eclipses are true? check all that apply.
A total lunar eclipse has a reddish colour, The moon moves between Earth and the Sun during a solar eclipse, and A lunar eclipse occurs during a full moon.
How was the eclipse discovered?Scientists have examined eclipses since age-old times. Aristotle observed that the Earth's shadow has a circular form as it moves across the moon. He declared that this must mean the Earth was round.
Thus, the above-mentioned statements about the eclipses are true.
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What role do the proteins in a virus’s outer coat play in the invasion of a host cell?
Answer:
They fit the proteins on the surface of the host cell.
Explanation:
The proteins in a virus's outer coat play a significant role in the attachment with the host cells and invade the host body.
What do you mean by Virus?A Virus may be defined as a microorganism that infects cells and may cause diseases.
The outer coat of the virus consists majorly of spike proteins that attach to the host cells and enter the body through the process of endocytosis.
Therefore, the proteins in a virus's outer coat play a significant role in the attachment with the host cells and invade the host body.
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The blank the temperature of an object the lower it’s thermal energy
Answer:. An abject with a higher temperature always has greater thermal energy than an object with a lower temperature
Explanation:
If an herbicide were to selectively inhibit development of antheridia in a moss colony, what would be the consequence?
The most likely consequence of a herbicide that selectively inhibits the development of antheridia would be the reproduction of female plants only.
Whta are antheridia?The antheridia are haploid reproductive structures that produce male gametes in some types of plants.
The antheridia can generate a special type of biflagellate sperm (male gametes) required during se_xual reproduction.
Conversely, archegonia is a structure that produces a single egg, i.e., the ovum or female gamete.
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write the difference between
a.Soil formation and Soil erosion
b.Soil pollution and Soil profile
a.
In soil erosion, the soil is carried away from by the wind or water from the top layer of the ground. Soil formation is making soil. It can be by the deposition of the soil from water or wind
What is yhe role of decomposers in an ecosystem?
Compare aerobic and anaerobic respiration. Which produces more energy (ATP?) Why?
Answer:
Aerobic respiration is far more energy-efficient than anaerobic respiration. Aerobic processes produce up to 38 ATP per glucose. Anaerobic processes yield only 2 ATP per glucose
Choose one specific natural resource in your region. Describe what it is used for, how it is harvested, what attempts have been made to manage it in a sustainable way, and how social, economic, and environmental needs may come into conflict. Evaluate how effective the attempts of natural resource management have been.
Answer:
Rainwater is very important in my area, we use it for crops, animals and for everyday essentials. It's collected in jars and kept stored, it can be filter then boiled to extract any bacteria. Then I usually sit it outside in the sun to grab the suns energy. This saves me a lot of money on utilities like my water bill for example. It's safe for everyone and poses no threat to the environment.
Explanation:
This is a natural alternative for anyone who loves nature and alkaline water
Answer:
Blue crab is an important resource in my region. It is harvested in Chesapeake Bay. People in my region have been eating blue crabs for hundreds of years. Blue crabs are usually harvested in traps called crab pots. Most crabs are harvested commercially, but recreational crabbing is also important. Crab harvesting in Chesapeake Bay is regulated by the states of Maryland and Virginia, and special licenses are required. Limits are placed on the number of crab pots and the sizes of crabs that can be kept. Even though regulations are in place to protect the crabs, their numbers are declining due to deteriorating water quality in Chesapeake Bay. The crabs require additional protection, but too many restrictions could put people out of work because blue crabs are a popular, traditional food in the region, and thousands of people make a living from crab fishing. The natural resources management of the crabs is inadequate because the crabs continue to be harvested in an unsustainable way.
Explanation:
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Please help IT WOULD MEAN THE ENTIRE WORLD!!!
Answer:
-if I'm not wrong the technique is used to produce the bacteria cell is DNA cloning because after a ligation, the next step is to transfer the DNA into bacteria in a process called transformation.
-The organic compounds scientist used to cut DNA is enzymes.
-the possible result would be the transformations made and selection of the bacteria.