Donna has observed that her father can control the speed of their grandfather clock by adjusting
the height of the weight on the end of the pendulum. Donna thinks that the pendulum will move
faster when the weight is lowered, and wants to test her idea. Donna gets a stopwatch and
measures the time it takes for the pendulum to swing twenty times when the weight is moved to
its lowest position. Donna begins to move the pendulum up by 1 cm and continues to measure
the time for twenty swings of the pendulum. Donna records her data.
What is would the hypothesis be, Independent/dependent variable, the constants and the control group of this experiment?
Thanks!
Answers
Answer:
Hypothesis: IF the weight is lowered, THEN the pendulum will move faster
Independent variable: Weight on the end of pendulum
Dependent variable: Speed of the pendulum
Constant: Same pendulum, same stopwatch
Control group: when the weight is moved to its lowest position.
Explanation:
- Hypothesis is a testable explanation given to proffer solution to an observed problem or answer a scientific question. In this investigation, Donna thinks that the pendulum will move faster when the weight is lowered. Hence, Donna's hypothesis is IF the weight is lowered, THEN the pendulum will move faster.
- Independent variable is the variable that is changed or manipulated in an experiment. In this experiment, WEIGHT on the end of pendulum is the independent variable.
- Dependent variable is the variable that is measured or recorded in an experiment. In this case, the dependent variable is the SPEED of the pendulum.
- Constant is the variable that is kept unchanged for all groups throughout the experiment. In this experiment, the constants are Same pendulum used, same stopwatch
- Control group is the group that doesn't receive the experimental treatment in an experiment. In this case, the control is when the weight is moved to its lowest position.
Related Questions
After four half-lives of decay, what is the ratio of radioactive parent isotope to stable daughter isotope?
answer: 1:15
Answers
1:15 is the ratio of radioactive parent isotope to stable daughter isotope,
after four half-lives of decay.
Let:
'A' be the initial concentration of the radioactive parent isotope'n' be the number of corresponding half-lives'A/2ⁿ ' be the final concentration of the radioactive parent isotopeUsing the Exponential Decay Relation:
A → A/2ⁿ ( after 'n' half-lives )
A⁴ → A/2⁴
A⁴ → A/16
∵The final concentration of the radioactive parent isotope is A/16.
∴The initial concentration of the stable daughter isotope will be 15A/16.
1:15 is the ratio of radioactive parent isotope to stable daughter isotope,
after four half-lives of decay.
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Blood pressure is expressed in millimeters of mercury because mercury is so dense it enables pressure to be measured with shorter columns.true/false
Answers
It is TRUE that blood pressure is expressed in millimeters of mercury because mercury is so dense it enables pressure to be measured with shorter columns.
Mercury is a very thick liquid that makes it possible to measure pressure with shorter columns, which is why blood pressure is stated in millimeters of mercury. A sphygmomanometer, which measures blood pressure, typically consists of an inflated cuff wrapped around the arm and a mercury column that monitors the pressure placed on the cuff. The mercury column displays the systolic and diastolic blood pressure in millimeters of mercury as the pressure on the brachial artery in the arm is released after the cuff is inflated (mmHg). Because mercury is denser than water and creates a more observable column, it is used to monitor blood pressure with greater accuracy.
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what is the main use of technology
Answers
Answer:
Technology plays an important role because it helps us deal with the complexities of life. Everyone having daily use over want or need.
Things technology helps with daily. ...
Communication. Nowadays we have phones and other devices that we can use to contact loved ones or people we need help from, unlike the old days.
Education. Some students use virtual school for a more flexible schedule or just o keep learning at home without a classroom or place to be needed.
Health. For example, MRI scan, CT scan, x-ray, or ultrasound are tech used at hospitals.
Internet searches. We can go to multiple research platforms and get answers to our questions from world experience or even find out abt our history.
House assets. Things like refrigerators, microwaves, stoves, lamps, fans/AC, TVs, tech assistants (If you have) and more.
Hope this helps but there's too many things to list!
Carbohydrates are the main source for the body to _______
A
Gain Energy
B
Build muscle
C
insulate itself
D
Protect itself
Answers
Answer:
gain energy
Explanation:
precipitation, made toxic by air pollution, that destroys plant and animal life, is referred to as
Answers
The precipitation, made toxic by air pollution, that destroys plant and animal life is referred to as acid rain.
Precipitation that becomes toxic due to air pollution and causes harm to plant and animal life is commonly known as acid rain. Acid rain is a phenomenon where rainwater or other forms of precipitation such as snow or fog become acidic due to the presence of pollutants in the air.
The primary culprits of this pollution are sulfur dioxide (SO2) and nitrogen oxides (NOx), emitted from industrial activities, power plants, and vehicle emissions.
When these pollutants mix with moisture in the atmosphere, they form sulfuric acid and nitric acid, resulting in acid rain. As acid rain falls to the ground, it can have detrimental effects on ecosystems. The acidity of the rain can damage vegetation, leading to reduced plant growth, leaf loss, and even death.
Aquatic environments are particularly vulnerable as acid rain can lower the pH of lakes, rivers, and streams, endangering fish, amphibians, and other aquatic organisms. Additionally, acid rain can also impact human-made structures and materials, including buildings, statues, and infrastructure, by corroding and deteriorating them over time.
Efforts to reduce air pollution and limit the emission of sulfur dioxide and nitrogen oxides are crucial in mitigating the harmful effects of acid rain and protecting ecosystems and human health.
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PLEASE HELP ME OUT I NEED HELP
Answers
Answer:
2-1 switched
Explanation:
which of the following is true of kinetochores? which of the following is true of kinetochores? they are the primary centromere structures that maintain the attachment of the sister chromatids prior to mitosis. they are sites at which microtubules attach to chromosomes. they interdigitate at the cell's equator and then move apart, causing the cell to elongate. they are located at the center of the centrosome; their function is to organize tubulin into elongated bundles called spindle fibers. they attach to the ring of actin along the cytoplasmic surface of the plasma membrane, causing the actin to contract to form the cleavage furrow.
Answers
Out of the provided options, the following statement is true of kinetochores: they are sites at which microtubules attach to chromosomes. Kinetochores are essential structures in the process of cell division.
Kinetochores are protein complexes that form on the centromere region of a chromosome, serving as an attachment point for spindle fibers (microtubules) during cell division.
In the process of mitosis, the following steps involving kinetochores occur:
1. During the prophase, the chromosomes condense, and kinetochores start to assemble at the centromere region of each sister chromatid.
2. In the prometaphase, the nuclear envelope breaks down, and spindle fibers (microtubules) extend from the centrosomes. The kinetochores on each sister chromatid capture the spindle fibers, ensuring proper attachment.
3. At the metaphase, the chromosomes align at the cell's equator (also known as the metaphase plate), with the help of kinetochores and spindle fibers.
4. In the anaphase, the sister chromatids separate as the kinetochores' spindle fibers shorten and pull the chromatids toward opposite poles of the cell.
5. During the telophase and cytokinesis, the separated chromatids reach the cell poles, the nuclear envelope re-forms, and the cell divides.
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Another question for today help me plz
And plz give me brainlyest
Answers
Answer:
HOW DARE YOU DELETE MY ANSWER
Explanation:
;O
which of the statements about gastrin is false? gastrin secretion is initiated in response to the sight or smell of food. gastrin stimulates the production of hcl. a low ph in the stomach inhibits the secretion of gastrin. gastrin is produced by cells lining the stomach.
Answers
The only false statement about gastrin is that it is produced by cells lining the stomach. Gastrin is actually produced by G-cells, which are located in the antrum of the stomach and in the duodenum.
Gastrin is a hormone that is secreted by cells lining the stomach. It plays an important role in regulating the secretion of gastric acid and pepsinogen, which are essential for digestion. When food enters the stomach, gastrin secretion is initiated in response to the stretch of the stomach wall, the sight or smell of food, and the presence of amino acids or peptides in the stomach. Therefore, the statement that gastrin secretion is initiated in response to the sight or smell of food is true.
Gastrin stimulates the production of hydrochloric acid (HCl) by parietal cells in the stomach. This acid is important for breaking down food and killing pathogens. Therefore, the statement that gastrin stimulates the production of HCl is also true.
A low pH in the stomach inhibits the secretion of gastrin. This is because gastrin secretion is regulated by a negative feedback loop. When the pH in the stomach drops too low, gastrin secretion is inhibited to prevent excessive acid production. Therefore, the statement that a low pH in the stomach inhibits the secretion of gastrin is also true.
These cells are stimulated to secrete gastrin in response to the factors mentioned earlier. Overall, gastrin is an important hormone that regulates gastric acid secretion and plays a crucial role in the digestion of food.
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Glycolysis does not require oxygen to occur in cells. However, under anaerobic conditions, glycolysis normally requires fermentation pahtways to occur to continue to produce ATP. Which best describes why glycolysis is dependent on fermentation under anaerobic conditions?
a. Glycolysis requires fermentation to produce more glucose as a substrate
b. Glycolysis requires fermentation to generate pyruvate for a later step in the pathway
c. Glycolysis requires fermentation to synthesize lactic acid and restore NADH to NAD+
d. Glycolysis requires fermentation to generate ATP molecules to complete the early steps of the pathway
Answers
Need help plspspl pls pls pls guys o need help pls pls pls pls
Answers
Answer:
sure what the question
Explanation:
Answer:
نام من باب سازنده استنام من باب سازنده استنام من باب سازنده است
Explanation:
نام من باب سازنده استنام من باب سازنده استنام من باب سازنده استنام من باب سازنده استنام من باب سازنده استنام من باب سازنده است
What is the ability of a cell membrane to allow materials to pass through it
called?
A. Catalysis
B. Synthesis
C. Permeability
D. Polarity
Answers
Answer:
C. Permeability
Explanation:
Answer:
c
Explanation:
Permeability is the amount of water that a cell membrane can allow to pass through it depending on the size of its pores.
TWO predator adaptations used to help them capture their prey are *
camouflage
outrunning prey
mimicry
fleeing
Answers
Answer:
Under the pressure of natural selection, predators have evolved a variety of physical adaptations for detecting, catching, killing, and digesting prey. These include speed, agility, stealth, sharp senses, claws, teeth, filters, and suitable digestive systems.
Explanation:
hope this helps mah dude.
Biologists are surveying a biome with an average precipitation of 188 cm and an average temperature above 18 c identify the biome they are surveying?
Answers
A biome having a rain fall of about 188 cm and above 18 degrees centigrade is a tropical savanna.
What is a biome?A biome refers to a zone of life found on earth. Different biomes are characterized by different amounts of rainfall and temperature.
A biome having a rain fall of about 188 cm and above 18 degrees centigrade is a tropical savanna.
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In the Tonicity of Red Blood Cells lab, you mixed whole blood with solutions of different concentrations in order to
Answers
The whole blood with solutions of different concentrations mixed in order to find the tonicity of each solution.
Osmosis is the movement of water from the high solvent concentration to low solvent concentration. The solution on addition of the red blood cells becomes opaque and the cells can be observed under the microscope. If the solution is hypertonic, the red blood cell loses water and undergo shrinkage. If the solution is isotonic, the water flow will be at equal rates and the cell will remain intact. If the solution is hypotonic, the water will flow into the cell causing the cell to swell up.
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Can someone help me please. Due tonight at 11:59pm.
PLEASSEE
Answers
Answer:
Explanation:c
Dominant allele frequency = number of dominant alleles / total number of alleles
Dominant allele frequency = 7 / 12
Dominant allele frequency = 0.5833
2)To find the percentage of dominant alleles, we can multiply the allele frequency by 100:
Percentage of dominant alleles = dominant allele frequency x 100
Percentage of dominant alleles = 0.5833 x 100
Percentage of dominant alleles = 58.33%
3)The allele frequency for the recessive allele can be calculated by subtracting the dominant allele frequency from 1:
Recessive allele frequency = 1 - dominant allele frequency
Recessive allele frequency = 1 - 0.5833
Recessive allele frequency = 0.4167
4)To find the percentage of recessive alleles, we can multiply the allele frequency by 100:
Percentage of recessive alleles = recessive allele frequency x 100
Percentage of recessive alleles = 0.4167 x 100
Percentage of recessive alleles = 41.67%
Image of grassland biome
Answers
Answer: here you go
Also I like burritos
For purposes of the law a mental disorder is:
Select one:
a. a disorder such as drug or alcohol dependence
b. all of the above are correct
оооо
C. any disorder or disability of the mind
d. a disorder such as learning disabilities
Answers
Answer:
C
Explanation:
if its a mental disorder i think it would be a disability of the mind
What is contained within the archegonium of both mosses and ferns? Sperm cells. The sporophyte generation. Egg/ovule cells
Answers
The archegonium of both mosses and ferns contains egg/ovule cells. These cells play a crucial role in the sexual reproduction of these plants by receiving and fertilizing sperm cells, leading to the development of the sporophyte generation.
The archegonium is a structure present in the gametophyte generation of these plants and serves as the female reproductive organ. It consists of a venter, which is a flask-shaped structure that houses the egg cell, and a long neck that extends above the surface of the plant. The egg/ovule cells within the archegonium are essential for sexual reproduction in mosses and ferns. When a sperm cell from the male gametophyte reaches the archegonium, it fertilizes the egg cell, resulting in the formation of a zygote.
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The leakage of vascular fluid into tissues is called:______
a. chemotaxis.
b. edema.
c. diapedesis.
d. vasoactivity.
e. pus.
Answers
The leakage of vascular fluid into tissues is called edema
Edema means swelling. The condition called edema arises when part of the body becomes swollen because fluid gathers in the tissue. It most commonly affects the arms and legs.
Edema can have various causes. Edema can be a mild and temporary water retention problem (or) a symptom of a serious disease (or) an adverse effect of medication or an allergic reaction.
There are different types of edema based on the underlying cause, they are peripheral edema (circulation damage), lymphoedema (damage of lymph nodes), pulmonary edema (fluid in lung air sac), cerebral edema (fluid in brain), etc.
Symptoms of edema include an arm or leg that starts feeling heavy and swollen, the skin near the edema feels tight or warm and there is a sensation of tautness or pain in the surrounding area.
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Gender can be defined as all of the following EXCEPT: the psychosocial ramifications of biological sex an ascribed status characteristic an acquired and transmitted pattern of shared meaning, feeling, and behavior a multidimensional phenomenon with many different facets, including gender schemas and stereotypes, gender-role identity, attitudes, and values
Answers
Gender can be defined as all of the following: the psychosocial ramifications of biological sex, an acquired and transmitted pattern of shared meaning, feeling, and behavior, and a multidimensional phenomenon with many different facets, including gender schemas and stereotypes, gender-role identity, attitudes, and values.
Gender can be defined as the psychosocial ramifications of biological sex, an acquired and transmitted pattern of shared meaning, feeling, and behavior, and a multidimensional phenomenon with many different facets, including gender schemas and stereotypes, gender-role identity, attitudes, and values. However, it is not accurate to define gender as an ascribed status characteristic. Unlike attributes such as age or race, which are typically assigned at birth and remain constant throughout life, gender is a social construct that encompasses a complex interplay of individual, cultural, and societal factors. It is not solely determined by external factors but also involves personal identity and self-perception. While gender can be influenced by societal norms and expectations, it is not solely an ascribed status but rather a dynamic concept that individuals may engage with and interpret in different ways.For more such question on gender
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What are the biggest misconceptions about sleep paralysis?
Answers
Sleep paralysis does not refer to the normal paralysis one experiences while sleeping.
If the frequency of an allele is maintained by new mutations replacing that allele at a rate equal to the rate of elimination of that allele by natural selection that allelic frequency is maintained by _______________________. A. mutation-selection balance B. frequency-dependent selection C. heterozygotic superiority D. mutation-dependent equilibrium
Answers
The correct answer to the question is A. mutation-selection balance. This is a state in which the frequency of a particular allele in a population is maintained over time by the balance between the rate at which new mutations of that allele occur and the rate at which natural selection eliminates that allele.
If the rate of new mutations equals the rate of elimination by selection, then the allelic frequency will remain constant. Mutations are the source of genetic variation, and they are constantly occurring in populations. Some mutations may be beneficial, some may be harmful, and others may have no effect on the organism's fitness. Natural selection acts on these mutations, eliminating those that are harmful and favoring those that are beneficial. Heterozygotic superiority, also known as overdominance, is a condition where the heterozygote has a higher fitness than either homozygote. This can contribute to the maintenance of genetic diversity in a population.
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Match the following terms and definitions.
1. any substance that can be decomposed by bacterial action
pollution
2. heat energy coming from inside the Earth; heat from volcanoes or geysers
geothermal
3. the act of contamination; making dirty or unclean
biodegradable
Answers
2.geothermal
3.pollution
hope this helps!!
2.geothermal
3.pollution
Which of the following is the
stigma,
where pollen lands on
the flower?
A. D
B. C
C. B
D. A
Answers
Answer: D
Explanation: The stigma is the part of the pistil where pollen lands and germinates.
Answer: The answer is D
Explanation:
2 paragraphs about interdependence-biology
Answers
Answer:
Interdependence is mutual dependence between things. If you study biology, you'll discover that there is a great deal of interdependence between plants and animals. Inter- means "between," so interdependence is dependence between things. We often use interdependence to describe complex systems.All living things depend on their environment to supply them with what they need, including food, water, and shelter. ... Many living things interact with other organisms in their environment. In fact, they may need other organisms in order to survive. This is known as interdependence.Explanation:
Hopes this helps. Mark as brainlest plz!Select all of the characteristics that apply to members of Phylum Arthropoda.
Open circulatory system
Segmentation
Nervous system centralized in head region
Three tissue layers
Answers
Open circulatory system, Segmentation, Nervous system centralized in the head region, Three tissue layers, All of the characteristics listed apply to members of Phylum Arthropoda.
Phylum Arthropoda is characterized by:
Segmentation: The body is divided into segments with jointed appendages.
Open circulatory system: Arthropods have a circulatory system in which the blood or hemolymph is pumped through a dorsal vessel and bathes the tissues directly, rather than contained in closed vessels.
Nervous system centralized in the head region: Arthropods have a centralized nervous system in the head region, consisting of a brain and several ganglia along the ventral nerve cord.
Three tissue layers: Arthropods have three germ layers during development (ectoderm, mesoderm, and endoderm) that give rise to the various tissues and organs of the body.
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-Salicylic acid is a naturally occurring chemical produced in willow trees.
Salicylic acid is used by humans in some acne products to kill bacteria that
cause skin irritation
Based on this information, what stimulus most likely causes willow trees to
increase the production of salicylic acid?
Freezing conditions that damages leaves
Changing seasons with less direct sunlight
Damage to the bark of the tree trunk
Exposure to pathogens in the vascular tissue
Answers
Answer: D on eduphoria
Explanation:
true or false? rock appears to be rising to the surface at each side of the sub-oceanuc rift valleys
Answers
The rock appears to be rising to the surface at each side of the sub-oceanic rift valleys True.
Many rift valleys are part of “triple junctions,” a form of divergent boundary in which 3 tectonic plates meet at about one hundred twenty° angles. fingers of the triple junction can cut up to form an entire ocean.
Rift valleys shape when tectonic plates beneath the Earth's surface diverge (or circulate far from each other in opposite directions). it's miles important to observe right here that rift valley formation, in contrast to rivers and glacial valleys, is entirely created as a result of tectonic plate motion.
Rift valleys are normally slim and long, some measuring masses of kilometers in duration. Their floors are relatively flat, owing in large elements of volcanic deposition and marine or lacustrine sedimentation. the edges of rift valleys drop steeply away within the shape of steps and terraces.
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Correct the mistakes in the paragraph by highlighting the mistakes. Correct the answers on a scratchpad.
The cell membrane controls the transport of materials in and out of the cell. It is very permeable. Animal cells also have a cell wall surrounding their cell membrane. The nucleus is a large organelle that is the control center and makes the DNA. The endoplasmic reticulum membranes provide a decrease in surface area where chemical reactions occur. The function of smooth ER is protein synthesis. If no ribosomes are attached to the ER, it is called rough Endoplasmic Reticulum. The function of rough ER is synthesis of lipids. Ribosomes are large organelles. The are made of rRNA and protein. The function of ribosomes is that they are the site of protein synthesis. Golgi Bodies functions in modification, assembly, packaging, storage and secretion of proteins. Vacuoles and vesicles are formed by pinching off from the Golgi apparatus, endocytosis of the cell membrane, and an extension of the ER membrane. Vacuoles are used for transport and storage of new materials.
Answers
Answer:
The cell membrane controls the transport of materials in and out of the cell. It is selectively permeable. Animal cells don't have cell wall surrounding their cell membrane. The nucleus is a large organelle that is the control center and makes the DNA. The endoplasmic reticulum membranes provide a increase in surface area where chemical reactions occur. The function of smooth ER is to make hormones. If there are ribosomes are attached to the ER, it is called rough Endoplasmic Reticulum. The function of rough ER is protein synthesis . Ribosomes are small organelles. The are made of RNA and protein. The function of ribosomes is that they are the site of protein synthesis. Golgi Bodies functions in modification, assembly, packaging, storage and secretion of proteins. Vacuoles and vesicles are formed by pinching off from the Golgi apparatus, embryogenesis of the cell membrane, and an extension of the ER membrane. Vacuoles are used for transport and storage of new materials