Answer:
70 °C
Explanation:
Since heat lost by 200 g of water = heat gained by 100 g of water
-mc(T - T') = m'c(T - T")
where m = 200 g,T' = 90°C, m' = 100 g,T" = 30°C and T = final temperature of mixture, c = specific heat capacity of water = 4.2jkg-1 k-1.
Substituting the values of the variables into the equation, we have
-mc(T - T') = m'c(T - T")
-200 g(T - 90 °C) = 100 g(T - 30 °C)
(T - 90 °C) = 100 g(T - 30 °C)/-200 g
(T - 90 °C) = -0.5(T - 30 °C)
T - 90 °C = -0.5T + 15 °C
collecting like terms, we have
T + 0.5T = 90 °C + 15 °C
1.5T = 105 °C
T = 105 °C/1,5
T = 70 °C
assume that the unaided human eye has a limit of resolution of about 1 mm. what was the limit of resolution of hooke's microscope?
The limit of resolution of Hooke's microscope was significantly smaller than the unaided human eye.
Robert Hooke, an English scientist in the 17th century, is known for his work in microscopy. He developed an early compound microscope, which allowed for higher magnification and improved resolution compared to the unaided eye.
While the exact limit of resolution of Hooke's microscope is not provided, it is generally accepted that his microscope had a resolution on the order of micrometers (μm) or even smaller. This means that it could distinguish details and structures that were much smaller than what the unaided human eye could perceive.
The resolution of a microscope depends on various factors, including the quality of lenses, the wavelength of light used, and the numerical aperture of the system. Hooke's microscope likely had a resolution in the range of tens or hundreds of micrometers, enabling him to observe and document microscopic structures and organisms with greater detail and accuracy.
Hooke's microscope had a significantly higher limit of resolution than the unaided human eye, allowing him to explore and contribute to the field of microscopy and our understanding of the microscopic world.
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Why did the size of the caribou population decrease?
Answer:
The herds have been declining in recent decades due to a complicated mix of factors including hunting, disease, diminished food availability, and climate change, the report explains.
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How does the movement, diet, and cellular structure of an organism play a role in classification?
Centrosomes and lysosomes are found in animal cells, but do not exist within plant cells.
The lysosomes are the animal cell’s “garbage disposal”, while in plant cells the same function takes place in vacuoles.
Plant cells have a cell wall, chloroplasts and other specialized plastids, and a large central vacuole, which are not found within animal cells.
The cell wall is a rigid covering that protects the cell, provides structural support, and gives shape to the cell.
The chloroplasts, found in plant cells, contain a green pigment called chlorophyll, which captures the light energy that drives the reactions of plant photosynthesis.
The central vacuole plays a key role in regulating a plant cell’s concentration of water in changing environmental conditions. follow me
Answer:
Describe the differences among meteoroids, meteors, and meteorites.
Explanation:
2. Draw a vertical profile of soil and groundwater below our feet, including a small stream. Include and label all major components: groundwater table, confining layers, unconfined aquifer, confined aquifer, saturated zone, unsaturated zone, the direction of groundwater flow. Be sure to show how the stream water level connects to the groundwater table. What if you spilled a DNAPL (a dense non-aqueous phase liquid) on the soil surface? Where would it migrate to in the subsurface? What if you spilled a LNAPL (a light non-aqueous phase liquid) on the soil surface? Where would it migrate to in the subsurface?
In a vertical profile, the soil and groundwater consist of the unsaturated zone, groundwater table, and saturated zone. A DNAPL spilled on the surface would migrate downward through the unsaturated zone, accumulating at a confining layer. An LNAPL spilled on the surface would migrate horizontally through the unsaturated zone, floating on the groundwater table.
A vertical profile of soil and groundwater below our feet, including a small stream is a type of representation of soil and groundwater below the earth's surface.
It is used to show the various layers present in the earth's surface, and how groundwater flows in it. In the profile, all major components are included and labeled as follows:
1. Groundwater table: The groundwater table is the topmost layer of groundwater. It is the surface of the groundwater, and it indicates the level of water in the subsurface.
2. Confining layers: Confining layers are layers of soil that restrict the flow of water. They can be made up of clay, silt, or other types of soil.
3. Unconfined aquifer: An unconfined aquifer is a type of aquifer that is not confined by any layer of soil. It is open to the surface and is connected to the atmosphere.
4. Confined aquifer: A confined aquifer is a type of aquifer that is confined by a layer of soil. It is not open to the surface and is not connected to the atmosphere.
5. Saturated zone: The saturated zone is the area of the soil where the pores are filled with water.
6. Unsaturated zone: The unsaturated zone is the area of the soil where the pores are not filled with water.
7. The direction of groundwater flow: Groundwater flows from higher elevations to lower elevations. It flows in the direction of the groundwater table.
8. Stream water level connects to the groundwater table by capillary action. If a DNAPL (a dense non-aqueous phase liquid) is spilled on the soil surface, it would migrate to the saturated zone since it has a high density and is non-aqueous. In the subsurface, it will move down until it reaches the first confining layer.
After it reaches the confining layer, it will move laterally and can eventually reach the confined aquifer. DNAPLs are hazardous chemicals that can contaminate groundwater, so they are a significant concern.
If a LNAPL (a light non-aqueous phase liquid) is spilled on the soil surface, it would migrate to the unsaturated zone because it has low density and is non-aqueous. The LNAPL will remain in the unsaturated zone until it is completely evaporated, absorbed by the soil, or removed. Because they are not as dense as water, they pose less of a risk to groundwater contamination than DNAPLs.
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Which components bond with andenine in a section if double stranded DNA
Answer: 3 and 5 only
Explanation:
Adenine is a purine nitrogenous base and it pairs with thymine which is a pyrimidine nitrogenous base with a triple hydrogen bond in a DNA structure. The adenine binds with thymine directly and indirectly with a deoxyribose sugar which is attached with it in the back it forms the part of sugar phosphate backbone and in the front hydrogen bonding helps in the stabilizing the DNA structure by binding two separate strands of DNA in a stable double helical structure.
P S Q R The biological levels of organization range from a single organelle all the way up to the biosphere in a highly structured hierarchy. Multicellular organisms are organized from the simplest to most complex: cells, tissues, organs, organ systems, organisms. Evaluate the model above. Select ALL of the statements that accurately depict the examples shown in the model. A) R shows an animal cell. B) O shows types of tissue. P shows organs in the endocrine system. D) P shows an organ system, the digestive system. E) S shows an organ system, the digestive system.
Answer: the red thing pretend is blood and blue thing is water you first ta
Explanation:
Answer:
A) R → Q → P → S
Explanation:
I just took the test on USA Test Prep
short note of all disease of
Bee farming
Answer:
American Foulbrood is a highly lethal and contagious disease of honey bees, caused by the spore-forming bacteria Bacillus larvae. The disease causes larvae to die after cells are capped. Worker bees have difficulty trying to remove the dead larvae, and often contaminate the hive with additional spores.
why does the male body stop producing testosterone when using anabolic steroids
Answer:
The use of anabolic steroids can raise blood levels of testosterone well above a person's normal range. As a result, the body may try to regulate testosterone levels by shutting down its own production of testosterone. In order to prevent this, people usually use anabolics in cycles of a few weeks on and then off.
Explanation:
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how do u get a perimeter of a rectangle?
Answer: All you have to do is add up all the sides
Explanation: Hope this helped you!!! Have a good day, and stay safe :)
Answer:
You would add all the sides
Explanation:
Area = multiplying 2 sides
Perimeter = adding up all the sides
so you would add all the sides of a rectangle
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if one jar of coffee costs $y, what will be the cost of four jars of coffee
Your answer would be $4 times $y.
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what is the relationship between the rate of wind and the amount of abrasion?
Which of the following amino acid changes can result from a single base change? a) Methionine to arginine. b) Histidine to glutamic acid. c) Glycine to alanine. d) Proline to alanine. e) Tyrosine to valine.
The amino acid change that can result from a single base change is : Glycine to alanine. (Option c)
A single base change in the DNA sequence, also known as a point mutation, can result in an amino acid change in the corresponding protein sequence. Among the given options, the amino acid change that can result from a single base change is:
c) Glycine to alanine.
Glycine (Gly) and alanine (Ala) are both nonpolar amino acids, and they have similar properties. They differ in the presence of a methyl group in alanine, which is absent in glycine. A single base change in the DNA sequence can lead to a substitution of one nucleotide, ultimately resulting in a change in the corresponding mRNA codon during translation. Depending on the specific codon affected, a glycine residue can be replaced by an alanine residue due to this single base change.
The other options:
a) Methionine (Met) to arginine (Arg): This change involves a substitution of a nonpolar amino acid with a positively charged amino acid. This change would typically require multiple nucleotide changes since methionine and arginine have different properties and are encoded by different codons.
b) Histidine (His) to glutamic acid (Glu): This change involves a substitution of a positively charged amino acid with a negatively charged amino acid. This change would typically require multiple nucleotide changes since histidine and glutamic acid have different properties and are encoded by different codons.
d) Proline (Pro) to alanine (Ala): This change involves a substitution of a cyclic amino acid (proline) with a nonpolar amino acid (alanine). This change would typically require multiple nucleotide changes since proline and alanine have different properties and are encoded by different codons.
e) Tyrosine (Tyr) to valine (Val): This change involves a substitution of an aromatic amino acid (tyrosine) with a nonpolar amino acid (valine). This change would typically require multiple nucleotide changes since tyrosine and valine have different properties and are encoded by different codons.
So, the only option where a single base change can lead to an amino acid change is c) Glycine to alanine.
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The building blocks of DNA are
Answer:
nucleotides
Explanation:
made of three parts , phosphate group, sugar group and one of four nitrogen bases
Answer:
Chromosomes
Explanation:
The chromosomes from both parents from the DNA of the offspring
List the pros and cons of nuclear power, coal, natural gas, and
petroleum. Compare the lists and select the preferred source(s) of
energy and explain why
Nuclear Power Pros: Nuclear energy is also a cleaner energy source than many other types of power plants. It emits fewer greenhouse gases than other power plants, including fossil fuel plants.
Cons: The risk of a nuclear disaster is high and can cause severe environmental damage. Radiation leaks can have devastating impacts on local ecosystems, and nuclear waste is very challenging to dispose of safely. There is also a high cost associated with building a nuclear power plant
Nuclear Power Pros: Nuclear energy is a highly concentrated energy source. The power produced from one nuclear power plant can operate an entire city and more. It is also a cleaner energy source than many other types of power plants. It emits fewer greenhouse gases than other power plants, including fossil fuel plants. It also has a lower risk of air pollution than other sources. The supply of uranium is abundant and reliable for the next 100 years.
Cons: The risk of a nuclear disaster is high and can cause severe environmental damage. Radiation leaks can have devastating impacts on local ecosystems, and nuclear waste is very challenging to dispose of safely. There is also a high cost associated with building a nuclear power plant. The preferred source of energy is nuclear power. Nuclear energy is highly efficient, and the supply of uranium is reliable for the next century. Though the risk of a nuclear disaster is high, nuclear energy is still a cleaner source of energy and releases fewer greenhouse gases than other sources of power. The supply of uranium is also abundant and can provide power for a long time. Overall, nuclear energy should be viewed as a viable option to produce electricity.
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Define the process of germination.
Answer:
Germination is usually the growth of a plant contained within a seed; it results in the formation of the seedling. It is also the process of reactivation of metabolic machinery of the seed resulting in the emergence of radicle and plumule.
or
Germination, the sprouting of a seed, spore, or other reproductive body, usually after a period of dormancy. The absorption of water, the passage of time, chilling, warming, oxygen availability, and light exposure may all operate in initiating the process.
or
Germination is the process by which an organism grows from a seed or similar structure. The most common example of germination is the sprouting of a seedling from a seed of an angiosperm or gymnosperm
Explanation:
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Which of the following characteristics is shared by viruses and living cells? Both viruses and living cells –
A. have a nucleus, as well as a cell wall.
B. contain nucleic acids such as DNA or RNA.
C. can replicate independently of a host cell.
D. use organelles to perform life functions.
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Answer:
B
Explanation:
The best-accepted hypothesis for the dispersal of monkeys to the New World is: Group of answer choices platyrrhines evolved from early anthropoids in Africa and rafted or island hopped across theAtlantic to South America. platyrrhines evolved from adapiforms in Asia and crossed a land bridge to the Americas. Old and New World anthropoids evolved independently from different lineages of Eocene primates in Africa and South America, respectively. transportation after human colonization.
Answer:
platyrrhines evolved from early anthropoids in Africa and rafted or island hopped across the Atlantic to South America. ( option A )
Explanation:
The best-accepted hypothesis for the dispersal of monkeys to the New World is ; platyrrhines evolved from early anthropoids in Africa and rafted or island hopped across the Atlantic to South America.
The group of answer choices are various hypothesis about the dispersal of monkeys but the best-accepted hypothesis is the first option ( Option A )
All the organisms in a community, along with all interacting environment factors, form a (n) ________
A. population
B. community
C. large biome
D. ecosystem
Answer:
D ecosystem
Explanation:
A ecosystem is liveing spiecies interacting with thier enviornment together as a system.
T/F. investigate two known causes for these rapidly dividing cells
True (T). Rapidly dividing cells have the ability to divide into two identical daughter cells more rapidly than normal cells.
This is because they are not subject to the same restrictions as normal cells when it comes to cellular division. Consequently, two known causes of rapidly dividing cells are mutations and stress. Mutations may lead to the formation of abnormal proteins or other cellular components that are unable to function correctly. Stress can also induce the overproduction of certain proteins or other cellular components.
Two known causes for rapidly dividing cells in cellular division are:
Cell Cycle Dysregulation: The cell cycle is a tightly regulated process that controls cell growth and division. Dysregulation of the cell cycle, such as the loss of cell cycle checkpoints or mutations in genes involved in cell cycle regulation, can lead to uncontrolled and rapid cell division. This dysregulation can result in the formation of tumors and is a hallmark of cancer.
Growth Factor Signaling: Growth factors are signaling molecules that stimulate cell growth and division. When cells are exposed to an excess of growth factors or when there is an abnormal activation of growth factor receptors, it can lead to uncontrolled cell division. Aberrant growth factor signaling pathways are implicated in various diseases, including cancer.
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FILL THE BLANK. 1. Nebula (cloud of gas and dust) Red Grant White Dwarf The above stages of evolution are for a Select one: O Low-mass star Ob. Normal-mass star OG High-mass star Od. Intermediate-mass star Through the use of a astronomers have determined that light from most stars is which produces evidence that the universe is ____ The statement above is completed correctly by the information in row Select one: O a radio telescope; blue-shifted; contracting. O b. radio telescope; red-shifted; expanding Oc. spectroscope; blue-shifted; contracting d. spectroscope; red-shifted; expanding Clear my choice
The above stages of evolution are for a high-mass star.
Through the use of a spectroscope, astronomers have determined that light from most stars is red-shifted, which produces evidence that the universe is expanding.
Explanation to the above given short answers are written below,
The stages of evolution mentioned in the question, namely nebula, red giant, and white dwarf, are characteristic of high-mass stars. Low-mass stars do not go through the red giant phase, and intermediate-mass stars have different evolutionary paths.
A spectroscope is an instrument used to analyze the light emitted or absorbed by celestial objects. When astronomers observe the light from most stars, they observe a redshift, meaning the light is shifted towards longer wavelengths.
This redshift is a result of the expansion of the universe, where galaxies and celestial objects are moving away from each other. The redshift provides evidence for the expanding universe and is a fundamental concept in cosmology.
Therefore, the correct completion of the statement is: Through the use of a spectroscope; red-shifted; expanding.
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Coral reefs support more species than any other marine environment. The biodiversity in a coral reef is great, and scientists estimate that there may be another 1 to 8 million undiscovered species of organisms living in and around reefs. Reef structures protect shorelines against waves preventing the destruction of beaches and coastal property. An artificial reef is a man-made structure that mimics some of the characteristics of a natural reef. Often, old ships and even subway cars are sunk off the coastal shore to create an artificial reef environment. What is the greatest benefit an artificial reef would provide to the people living along the coast
Answer:
The artificial reef would decrease erosion of the coastline.
Explanation:
Artificial reefs are created in area where there is little uderwater topography or near established coral reefs to imitate or even substitute for natural coral reefs where they are absent or endangered due various factors which are mostly human in nature. The artificial serves to provide a habitat for marine organisms and ensure more biodiversity around the area by providing shelter from predation and surfaces for encrusting organisms such as corals and sponges to grow on. The growth of these lower level food chain organisms attract larger predator organisms thereby increasing the biodiversity in the area.
Artificial reefs are made from a variety of materials such as shipwrecks, construction debris, oil rigs, concrete, and any other man-made objects. Since reef structures protect shorelines against waves, artificial reefs would decrease the erosion of the coastline providing benefit to the people living along the coastline by preventing the destruction of beaches and coastal property,
It is difficult to achieve global sustainability because
A. it is an unrealistic goal.
B. governments do not always agree on how to solve environmental problems.
C. international agreements are not binding.
D. globalization is increasing.
The genetic code is carried ____ molecule in most organisms.
chromosomal
DNA
Guanine
hereditary
27. What will happen if one kidney of a person is removed?
A) He will survive and remain normal.
B)
He will die.
Urea will go on accumulating in the blood.
D)
Urination will stop.
E)
He will always feel thirsty.
Answer:
he will survive and remain normal
Answer:
Explanation:
Option A is the correct answer
In all reptiles, birds, and mammals, the processes of excretion, water and salt balance,
and the regulation of pH in body fluids are controlled by the kidneys. This is an example
of the organism maintaining
a. reabsorption
b. homeostasis
c. insulation
d. hibernation
what is the difference between the way that saprotrophs and detritivores digest their food
Answer:
Externally
Explanation:
Usually, detritivores are mostly animals, while saprotrophs are mostly fungi. Furthermore, detritivores consume lumps of dead organic matter separately, while saprotrophs absorb chemically digested food. Saprotrophs digest their food externally, whereas detritivores do it internally in the digestive system.
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A) If a female spinach plant with green (GG) leaves is crossed (pollination and fertilization occur) with a male spinach plant with purple (gg) leaves. What are the genotypes of the offspring and what traits will they express including the probability or ratio.
Answer:
The genotype Ratio is 1. All are Gg.
The phenotype is all Green spinach
Explanation:
Punnett Square:
G G
_________________
g | Gg | Gg |
|________|________ |
g | Gg | Gg |
|________|________ |
The genotype Ratio is 1. All are Gg.
The phenotype is all Green spinach
1. The sister chromatids are moving apart.
2. The nucleus and other organelles are no longer visible.
3. A new nuclear membrane is formed around the chromosomes.
4. The centrioles have reached the opposite poles of the cell.
5. The threadlike genetic material is formed and found in the nucleus.
6. The chromosomes are located at the equator of the cell.
7. The mitotic spindle disappears.
8. The centromeres of chromosomes split.
9. The mitotic spindle is formed.
10
11. The cell elongates.
12. Centrioles start to move toward the opposite poles of the cell.
13. Cytoplasmic contents start to duplicate.
14. The reverse of prophase.
15. The mitotic spindles converge and connect to the kinetochore of
chromosomes.
What kind of inheritance do you think the trait for the pedigree shows
Answer:
The information from a pedigree makes it possible to determine how certain alleles are inherited: whether they are dominant, recessive, autosomal, or sex-linked. To start reading a pedigree: Determine whether the trait is dominant or recessive. If the trait is dominant, one of the parents must have the trait.
Explanation: