Three different dynamic carts of different masses are rolled down a ramp. The heaviest one rolls down the ramp the fastest. Before concluding that a more massive cart will roll down a ramp faster, what experiment with these three carts might you want to do?
A) Run an experiment with the ramp at a different angle.
B) Find a fourth cart to add to the test, then test again
C) Change the surface of the ramp, then test the carts again.
D) Add masses to each car until they have the same mass, then test the carts again.
Answer:
The answer is D ;)
Explanation:
I got it right on USA TEST PREP
D) Add masses to each car until they have the same mass, then test the carts again.
How does mass of an object does have an effect on its acceleration?The mass of an object does have an effect on its acceleration down a ramp, as described by the formula F=ma (force = mass x acceleration).
However, the relationship between mass and acceleration is not as simple as assuming that a more massive cart will always roll down the ramp faster.
This is because there are other factors that can affect the acceleration of the cart, such as the angle of the ramp, the surface of the ramp, and the friction between the cart and the ramp.
To isolate the effect of mass on acceleration, it would be necessary to control for these other variables. Adding masses to each cart until they have the same mass would allow for a fair comparison of the effect of mass on acceleration down the ramp.
By ensuring that the only variable that is changing is the mass of the cart, it would be possible to determine whether the heaviest cart does indeed roll down the ramp the fastest.
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A cell membrane is ...................which means that it allows only
certain substances to enter or leave a cell
semipermeable
permeable
2
Passive transport is the movement of substances through a cell membrane by using energy
true
false
3
Diffusion is the movement of substances from an area of low conc. to an area of high concentration
true
false
4
diffusion continues till equilibrium
true
false
5
...............is the diffusion of water molecules only through a membrane
facilitated diffusion
Osmosis
6
Transport proteins that carry large molecules, such as sugar molecules, through a cell membrane ..........
Carrier proteins
channel proteins
7
Transport proteins that form pores through a cell membrane
channel proteins
Carrier Proteins
8
When molecules pass through a cell membrane using special proteins
facilitated diffusion
Osmosis
9
facilitated diffusion needs energy
true
false
10
membranes are boundaries between cells and organelles
true
false
Answer:
semi-permeable
Explanation:
passive transport is the movement of substances along the concentration gradient and no energy is utilized in it
Why is the Sl measurement system so important to the scientific community?
Answer:
Scientists use a shared system for reporting measurements called the International System of Units (SI). We use common measurement systems because science involves a lot of replication (i.e., repetition) to confirm results.
Explanation:
How does the atmosphere help life on Earth?
-It creates water.
-It provides a habitat.
-It keeps the planet cool.
-It filters out harmful radiation.
Answer:
It filters out harmful radiation
Explanation:
Earth is covered by a thick blanket of atmosphere to avoid high radiations from sun
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Calcium, magnesium, and strontium are near each other on the periodic table and have some characteristics in common, but they differ in chemical reactivity. Which lists these metals in order from most reactive to least reactive?
A. calcium, magnesium, strontium
B. magnesium, calcium, strontium
C. strontium, calcium, magnesium
D. strontium, magnesium, calcium
Answer:
B
Explanation:
Answer:
strontium calcium magnesium
Explanation:
magnesiums atomic number is 12
calciums is 20
strontium is 38
Which soil would most likely be found in the Arctic?
O Andisols
O Gelisols
O Histosols
O Spodosols
Answer:
B. gelisols
Explanation:
tundra soils are formed at high latitudes
Answer:
Explanation:
B. gelisols
Hydrangea plants produce flowers that can be either blue or pink in color. The flowers will be blue if they are grown in acidic soil (having a pH of 5.5 or less) or pink if they are grown in soil with a neutral to basic pH of 6.5 and up. What can be concluded from this information?
Answer:
The correct answer would be - Hydrangea plants depend on the concentration of some element which is affected by the acidic or basic nature of the soil.
Explanation:
Hydrangeas plants produce two different type of flowers blue and pink. The color of the plant depends on the pH of the soil or the acidic or basic nature of the soil. If the pH of the soil is acidic which means 5.5 or less the color of the flower would be blue and if it is near or above the 6.5 flowers would be pink.
So, it is clear that the concentration of any element that affected by the pH of the soil is responsible for the color of the flowers, in this case, it is found that the concentration of aluminum ions (Al+++) in the soil. When the soil is alkaline less concentration aluminum available for the plant and more available to the plant when the soil is acidic.
Now, we would like you to share your plant evaluations with Sandy Waters, President of Save the Shoreline. You will do this by writing Mr. Waters a letter. When writing your letter, be sure to use a traditional letter format. This means that your letter should include a greeting (Dear ________, ) a body, and a closing (Sincerely, _________). The body of your letter must include the following: an opening that describes the procedure for ranking plants all plant rankings evidence from the data to support plant rankings a closing that explains how plant rankings could protect the dunes As always, be sure to use complete sentences and proper punctuation, capitalization, and spelling.
Identification of a sample includes providing the scientific name and origin of the species. More detailed information that requires a bibliographic survey is not included in the standard identification.
How is the identification of plants?Dear Sandy Waters, the most common process of plant identification is by comparison; in this process the newly collected sample is compared with another previously collected and identified. If all the characteristics are similar, the name of the sample can be determined.
Yours sincerely.
With this information, we can conclude that identification of a sample includes providing the scientific name and origin of the species. More detailed information that requires a bibliographic survey is not included in the standard identification.
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Describe the four characteristics of life and give an example of how a bird shows that characteristic
Answer:
1: it has one or more cells
2: it can reproduce
3: it grows
4: and it maintains homeostasis
Projection maps of earth are made in a variety of ways , such as the Robinson’s projection , Mercator projection, and conic projection.
Why is this variety necessary?
A) all projection maps are accurate only across small regions .
B)most projection maps are more accurate near the center .
C)all projection maps are subject to varying types of distortion.
Answer:
C. All projection maps are subject to varying types of distortion.
Explanation:
The only truly accurate representation of Earth is the globe, as earth is a sphere. When one tries to map out a 3-d sphere on a piece of paper, it is impossible without some kind of distortion occurring. This distortion happens with distance, size, and sometimes other factors. Different projections are used for different purposes because some are more accurate than others in terms of distance, size, relative position, etc.
What is the total magnification used to view these onion cells through the microscope setup on the right?
Answer:
400
Explanation:
Answer:
x400
Explanation:
Describe the electric charges of the three main subatomic particles
Answer:
Electrons-negative
Protons-positive
Neutrons-neutral
Explanation:
Electrons have a negative charge, protons have a positive charge, and neutrons have no charge, so they have a neutral charge.
The electric charges of the three main subatomic particles are as follows:
Electrons: negative ([tex]-1.602[/tex] × [tex]10^-^1^9[/tex] coulomb).Protons: positive ([tex]+1.602[/tex] × [tex]10^-^1^9[/tex] coulomb). Neutrons: neutral (no net charge).What is the location of subatomic particles?Protons are the type of subatomic particles which are present within the nucleus of an atom along with the neutrons. While electrons are consistently revolving around the nucleus of an atom. Each one of them are having specific characteristics with respect to their identities.
Protons significantly have a positive electrical charge of one (+1) and electrons generally have a negative electrical charge of one (-1), while neutrons are neutral subatomic particles that bear no net charge.
Therefore, the electric charges of the three main subatomic particles are described above.
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Which three components are common to all amino acids?
an amino group, a carboxyl group, and an R group
an amino group, a phosphate group, and an R group
a five-carbon sugar, a phosphate group, and a nitrogenous base
a five-carbon sugar, an amino group, and a nitrogenous base
Answer:
A
Explanation:
eg
Inorganic solvents cannot dissolve amino acids, but water can.The only type of amino acid found in proteins in the human body is L-. Thus, option A is correct.
What are the components are common to all amino acids?All amino acids have at least one basic amino group and one acidic carboxylic acid group. Amino acids are crystalline, colorless solids.
The fundamental structure of each amino acid is the same, Each amino acid has a carbon atom at its “core” known as the carbon, and four groups are connected to it: a hydrogen atom, a—carboxyl group, an -amine group, and an R-group, also known as a side chain.
Therefore, The R-group is the only distinctive component of each amino acid because the carbon, carboxyl, and amino groups are shared by all amino acids.
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CER (Claim, Evidence, Reasoning). Is a virus a living thing?
No, they are not, without cells of a living thing, they would not be able to multiply.
You look at a cell under the microscope and see cell walls and membrane-bound organelles. What type of cell are you looking at? Justify your answer.
Answer:
Plant cells.
Explanation:
plant cells have features that animal cells do not have: a cell wall, a large central vacuole, and plastids such as chloroplasts. ... In addition to containing most of the organelles found in animal cells, plant cells also have a cell wall, a large central vacuole, and plastids.
explain hypothesis with scientific knowlage
Answer:
So it is an experimental statement where scientists try predict what wwill happen
Explanation:
Example
Diffusion in teabags happen fastest in boiling water.
Because the particles gain energy abd move around more
True or false an aquatic succession can result in a terrestrial primary succession
Answer:
True
Explanation:
Humans get most of their energy from eating what type of food?
Lipids
Meat
Protein
Carbohydrates
A chemist is studying dissolved gases in the ocean. She graphs her data as shown below. Explain the trend shown in dissolved oxygen and carbon dioxide versus depth, and then predict where organisms that rely on high oxygen concentrations would live. Justify your answer by using the data provided.
Answer:
Don't copy word for word, but here are the explanations for the two parts of this question.
Explanation:
1. Explain the trend shown in dissolved oxygen and carbon dioxide versus depth
~ Looking at the chart you can see that there is a higher concentration of O2 in the higher depths of the ocean. Its concentration is around 6 ml/l when the depth is around 0 ft. The chart showing the depth getting deeper - to around 8,000 ft, O2 concentration is around 2 ml/l. Which concludes that the higher you are in the ocean, the higher the concentration of oxygen there is. The opposite conclusion applies for CO2. For example 8,000 ft of depth causes the level of CO2 to rise to 4.4 ml/l. At a depth of 2,000 ft carbon dioxide levels are about 2.8 ml/l. This data tells us that carbon dioxide levels rise the deeper you go into the ocean.
2. Predict where organisms that rely on high oxygen concentrations would live
~ Organisms that rely on high oxygen concentration would live in higher depths of the ocean. The epipelagic and mesopalegic zones have a higher concentration in oxygen than bathypelagic or abyssopelagic zones, so the epipelagic and mesopalegic zones would be good for organisms that need a higher concentration of oxygen to survive. Light is also much closer to the water in the higher zones making it a better habitat for those specific organisms. Organisms that rely on high oxygen also rely on photosynthesis.
Oxygen is present in large amount near the surface whereas carbondioxide gas is present in large amount at the depth of the ocean.
According to the graph, oxygen gas is present in large amount near the surface of ocean but with the increase in depth, the concentration of oxygen gas decreases while on the other hand, the concentration of carbondioxide gas is higher in the depth and lower at the surface.
So those organisms that needs oxygen for their growth and survival are present near the surface of the ocean but those organisms that needs carbondioxide for their growth and survival are present at the depth of the ocean so we can conclude that oxygen is present in large amount near the surface whereas carbondioxide gas is present in large amount at the depth of the ocean.
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Which lipid acts as a chemical messenger?
adipose tissue
cholesterol
testosterone
beeswax
the answer is testosterone
Answer:
the answer is c, testosterone
Explanation:
I just took the quiz on edge
1. Zach made a chart to show how many mm his plant grew each week for 7 weeks. Each block equals 5 mm of growth. How tall is the plant?
The given question is missing the chart or the details of blocks, each week. However, the details of the blocks are as follows:
1week = 2blocks
2weeks = 3blocks
3weeks = 5blocks
4weeks = 4 blocks
5weeks = 5blocks
Oweeks = 5blocks
7 weeks = 3blocks
Answer:
The correct answer is - 13.5 cm.
Explanation:
According to the details of the blocks, the number of blocks each week as follows:
1week = 2blocks
2weeks = 3blocks
3weeks = 5blocks
4weeks = 4 blocks
5weeks = 5blocks
Oweeks = 5blocks
7 weeks = 3blocks
Adding total blocks would be :
2 +3 + 5 + 4 + 5 +5 + 3 = 27 blocks
Each block equals 5 mm of growth.
Then, 27 x 5 = 135 mm
135mm = 13.5 cm
Thus, the correct answer is : 13.5 cm
.
Think about the relationship between each word pair
below. Then write a question about the first term that
uses the second term as the answer. For the pair
organism. cell, the question could be "What is the
basic building block of all organisms?" Answer the cell
4. evolution, adaptation
5. observation data
6. DNA gene
Answer:
4. Question : In theory of evolution, name the mechanism by which species adjusts to their changing environment?
Answer : Adaptation
5. Question : An observation is used to collect what?
Answer : data
6. Question : Your DNA consists of what ?
Answer : gene
Explanation:
4. Question : In theory of evolution, name the mechanism by which species adjusts to their changing environment?
Answer : Adaptation
In evolutionary theory, the mechanism of adaptation is the biological method by which any organisms try to adjust to the new environments or to the changes in the current surrounding environment.
5. Question : An observation is used to collect what?
Answer : data
An observation may be defined as a data collection method, which allows you to gather knowledge or information of a researched phenomenon by making observations when any phenomena occurs.
6. Question : Your DNA consists of what ?
Answer : gene
Genes are defined as the segments of DNA (deoxyribonucleic acid) that contain code for the specific protein which functions in one cell or more types of body cells.
In the laboratory, students pressed hulled, raw sunflower seeds between
two pieces of paper cut from a brown lunch bag. Oily dark spots
appeared on the paper. The test confirmed the presence of which
biological macromolecule in the sunflower seeds? *
O Carbohydrate
Lipid
Nucleic acid
Protein
Answer:protein
Explanation:
Numerous amino acids with positively charged amino groups in their side chains make up proteins, hence option D is correct.
What is Protein?Nitrogen atoms are present in these amino groups, large, intricate molecules known as proteins that serve a variety of vital functions in the body.
They are crucial for the construction, operation, and control of the body's tissues and organs and carry out the majority of their job inside cells.
Pre-translational activities such as protein folding, modifications, and proteolysis are often included together with transcription, translation, and post-translational events.
In order for your body to repair damaged cells and create new ones, you need protein in your diet. Children, teenagers, and expectant women all need protein for healthy growth and development.
Therefore, oily dark spots appeared on the paper the test confirmed the presence of Protein.
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Cellulose is found throughout the cell walls of plant cells. Cellulose makes cell walls rigid, which indicates that cellulose is a carbohydrate. lipid. nucleic acid. protein
Answer:
Carbohydrate
Explanation:
Cellulose is a type of carbohydrate
Answer:
Carbohydrate
Explanation:
Blank is a blank found in the cell
A student set up four test tubes containing starch solution in which to perform starch digestion. Supplies include amylase and an incubator. Amylase is an enzyme present in humans and works best and standard body temperatures. In which tube listed would starch digestion proceed most quickly?
A) Tube 3: Amylase present, when the temperature is freezing (0 c)
B) Tube 1: No amylase, room temperature (25 c)
C) Tube 2: No amylase, body temperature (37 c)
D) Tube 4: Amylase present, body temperature (37 c)
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The amylase will achieve greater digestion of carbohydrates in tube 4 where amylase is present at body temperature.
Enzymes are biological catalysts that perform various functions in the body. Enzymes are proteins and they function optimally at body temperature. Amylase is one of the enzymes involved in carbohydrate digestion.
Amylase breaks down carbohydrates into simple sugars. As a result of this, digestion of carbohydrates starts in the mouth. The amylase will achieve greater digestion of carbohydrates in tube 4 where amylase is present at body temperature.
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A turtle laying in the sun to maintain its body temperature
Answer:
is there another part of this?
Explanation:
What is the pattern of population growth in which growth slows and population size
levels off as the population approaches carrying capacity?
just needed coins xd
Which of the following kinds of cells preform basic functions such as obtaining energy from food?
Plant cells, but not animal cells
Animal cells, but not plant cells
Both plant cells and animal cells
Neither animal cells nor plant cells
Answer:
Both plant cells and animal cells
Explanation:
The process where the energy locked up in food is extracted take place in both plants and animal cells.This process is called Cellular respiration.It is the process of combining inhaled and diffused oxygen in the blood with assimilated food substances (glucose,amino acids,fatty acids and glycerol) to produce energy.
In both cells it takes place in the the cytoplasm and mitochondrial.
It begins with Glycolysis, followed by Krebs's Cycle..These two steps gives certain of ATPs to these cells
.However,the largest amount of ATPs is synthesized during oxidative phosphorylation for maximum of energy to be produced.This process involved the chemiosmosis where protons were diffused into the intramembranes by the proton pump (PMF) and diffused back into the matrix of the mitochondria to generate the electrochemical gradients.
The electrochemical gradients generate the energy for enzymes ATPase synthase needed for phosphorylation of ADP with Pi to give ATPs.
The oxygen act act the final electron acceptor.
What process signals the end
of the cell cycle and the start
of a new cycle?
A. cytokinesis
B. mitosis
C. S phase
Answer:
B
Explanation:
Mitosis
