Big question for physicists out there:How can we be sure dark matter actually exists in our universe?
Answers
Answer:
We can see the bright matter, like stars, but we know some other matter is there(dark matter)because of how it pulls on the bright matter.
Explanation:
Related Questions
Award is 100 Points for the First Correct Answer!
Question:
which has more calories : table sugar or aspartame ?
Answers
Table sugar, also known as sucrose, contains 4 calories per gram, whereas aspartame contains only 0.2 calories per gram. This makes table sugar much higher in calories than aspartame.
Answer:
Table sugar has more calories than aspartame. A teaspoon of table sugar (4 grams) contains approximately 16 calories, while a teaspoon of aspartame (0.5 grams) contains only 0.4 calories. This is because table sugar is a carbohydrate and contains four calories per gram, while aspartame is a non-nutritive sweetener and is virtually calorie-free.
A grade 8 students burnt white phosphorus in the air contained in a bell jar. what will be the volume of the renaming air in the bell jar.
A. 20%of the air
B. 50% of the air
C. 25% of the air
D. 79%of the air
Answers
Identify the 3 types of variables for each example experiment below, and then provide an explanation as to why you identified the variables in the way that you did. The variables include the following: independent variable, dependent variable, and the control variable.
Example 1: You would like to add some depth and charm to your garden by adding different sized plants to your garden. You’ve done some research and would love to plant chimney bellflowers because of their appeal and height. One of the questions that comes to your mind is “which brand of fertilizer to use in order to produce the tallest bellflowers?”
Example 2: Your younger brother has asked that you help him with his 5th grade science fair project. One of the areas he is interested in knowing more about is acid rain. You decide to simulate acid rain by creating an experiment that involves vinegar and limestone chips. You and your brother decide to determine if the amount of vinegar will impact limestone chip mass. You set up four different treatments. Each treatment will contain a different percentage or concentration of vinegar but with the same initial mass of limestone chips. You both make a hypothesis and discuss how it relates to acid rain together, and then illustrate the results on a trifold board.
Example 3: In your biology class, you’ve learned a lot about marine ecosystems. It has created an interest in maybe one day being a marine biologist. You’ve decided that you will design an experiment that looks at the impact of rising sea temperature on the quantity of algae in a specific ocean site. You will determine the number of algae under varying temperatures at this ocean site. You are hoping that these findings will help you become more of an advocate for marine life in this time of global climate change.
NEED ASAP I WILL GIVE Brainliest
Answers
Answer:
Example 1:
Independent variable = The brand of fertilizer
Dependent variable = The height of the chimney bellflower measured (in cm or m) using a ruler or metre stick or measuring tape etc
Control variable = The type of flower used i.e., chimney bellflower
Example 2:
Independent variable = The percentage/concentration of vinegar
Dependent variable = The (change in) mass of the limestone chips measured (in g or kg) using a scale
Control variable = The initial mass of the limestone chips
Example 3:
Independent variable = The temperature of the seawater
Dependent variable = The quantity of algae in a specific ocean site
Control variable = The ocean site and the starting amount of algae in it
Explanation:
The independent variable is the variable in an experiment that it changed e.g., in example 1 the test was about which brand of fertilizer would produce the tallest bellflowers. Therefore, to test this, you would have to experiment with different brands of fertilizers thus constantly changing it in the experiment.
The dependent variable is the variable in an experiment that is measured e.g., in experiment 2 the test was about if the mass of the limestone chips would change with different concentrations of vinegar. Therefore, to test this, you would have to measure if there was a change in the mass of the limestone chips thus making it the dependent variable
The control variable is the variable in an experiment that you keep the same e.g., in experiment 1, in order to test which brand of fertilizer produced the tallest bellflowers, you would have to keep the type of flower the same (i.e. chimney bellflowers) because that is the flower you are experimenting. It would not make sense to use a different flower since that could produce different, incorrect data
Experiments contain different types of variables. We will present you with some of the main types of experimental variables, their definitions and give you examples containing all variable types.
Types of experimental variables:
Independent variables (IV): These are the factors or conditions that you manipulate in an experiment. Your hypothesis is that this variable causes a direct effect on the dependent variable.
Dependent variables (DV): These are the factor that you observe or measure. As you vary your independent variable you watch what happens to your dependent variable.
Figure 1. Shows the relationship between the independent and dependent variable.
Extraneous variable: An extraneous varable is any extra factor that may influence the outcome of an experiment, even though it is not the focus of the experiment. Ideally, these variables won’t affect the conclusions drawn from the results as a careful experimental design should equally spread influence across your test conditions and stimuli. Nevertheless, extraneous variables should always be considered and controlled when possible as they may introduce unwanted variation in your data. In this case, you need to tweak your design and procedure to be able to keep the variation constant or find a strategy to monitor its influence (constant or controlled variables). All experiments have extraneous variables. Here are some examples of different types of extraneous variables:
aspects of the environment where the data collection will take place, e.g., room temperature, background noise level, light levels;
differences in participant characteristics (participant variables); and
test operator, or experimenter behavior during the test, i.e., their instructions to the test participants are not consistent or they give unintentional clues of the goal of the experiment to the participants.
PLSSSSSSSS HELP MEEEEEEEEEEEEEE
Answers
Answer: The answer to your question is B,C,D.
Answer: i think A, B, D?
Explanation:
Calculate the mass of an object that has a density of 20 g/mL and a volume of 5 mL.
Answers
Answer:
4
Explanation:
density= mass/volume
Answer:
100kg
Explanation:
\(density= mass/volume\)
using this formula you can re arrange the equation my moving the volume onto the opposite side
giving you this formula : mass= density x volume
in doing so you can calculate the mass of the object by extracting the relevant information of the question
density=20g/ml
volume=5ml
mass = density x volume
=20 x 5
= 100
please help bohr diagram practice
Answers
Answer:
nothing is here
Explanation:
What factor is responsible for keeping the inner core in a solid state?
O A. High temperature
OB. High pressure
O c. Strong magnetism
O D. Strong electricity
SUBMIT
Answers
Answer:B should be the right answer “High pressure”
Explanation:
please help me 7th grade science
When a chemical reaction occurs, what happens to the atoms of the two substances? Provide an example from the Sim (on Amplify) as evidence to support your answer.
When a chemical reaction does not occur, what happens to the atoms of the two substances? Provide an example from Sim as evidence to support your answer.
Answers
An example of this can be seen in the Sim on Amplify, where students can experiment with different chemical reactions. For instance, in the "Chemical Reactions" Sim, students can explore the reaction between iron and sulfur to form iron sulfide. In this reaction, the iron atoms and sulfur atoms combine to form a new compound, iron sulfide, with different properties than the original iron and sulfur. The atoms of the iron and sulfur are rearranged to form new bonds, resulting in the formation of a new substance. This is an example of a chemical reaction, where the atoms of the two substances are rearranged to form a new compound with different properties.
Answer:
Explanation:A chemical response is a chemical transformation in which two chemicals combine to create a third component.
(i) Adding diluted acid to an active metal causes the test tube to heat up and hydrogen gas to escape, which results in the production of heat.
(ii) When diluted hydrochloric acid is added to silver nitrate, AgCl, a white precipitate, results.
(iii) When water is added to quicklime, the mixture boils and produces heat along with a hissing sound.
(iv) Thermal breakdown of mercury oxide - Mercury turns from red to a metallic silver tint as a result of this process.
An electromagnet is magnetic because electric current runs through it
ОО
True
False
Answers
The image shows the gravitational effects of the moon (not shown) on the Earth (depicted here) and the resulting tides that form. Which statements are true about the gravitational force between the Earth and the moon? Select ALL that apply.
Responses
A The moon exerts equal gravitational force on all locations of the Earth
B The moon exerts a smaller gravitational force on Earth locations that are farther away
C The moon must be to the right of the Earth because gravity is an attractive force.
D The moon must be to the left of the Earth because gravity is a repulsive force.
E The moon exerts a greater gravitational force on the Earth than the sun does.
Answers
Answer: B
Explanation:
Brainliest please! (if im right)
Can someone help me. I fell asleep in class. T-T
Answers
explain the difference between the 3 types of galaxies
elliptical galaxies
spiral galaxies
barred spiral galaxies
Answers
There is quite a big difference between a barred spiral galaxy and an elliptical galaxy.
The image attached below shows a barred spiral galaxy, NGC 2217. In barred spiral galaxy there is large bar like structure across the core of the galaxy , and on the terminal end there are the spiral arms of the galaxy. It is believed that the bar plays a role of material transportation to the core. The bar funnels in the surrounding material toward the SMBH at the core. The arms of the barred spiral galaxy often host high star formation rate as seen in the image below. The bar is often consist of dust and old stars.Where as in elliptical galaxy, the galaxies are somewhat diffused and also they don’t host much of the new stars. Elliptical galaxies are often unbounded. Elliptical galaxies are believed to be formed from several mergers and that’t the reason for their inability to form new stars.
Hope it will help
I know this is very big answer
How does water vapor move to different areas in the atmosphere?
Answers
Answer:
heat from the sun
Explanation:
Match the term to its definition (Lessons 6.03, 6.04 and 6.05)
(i can't fit this all without confusion)
Answers
Answer: the first paragraph is rain forest biome and the 2nd one is arctic tundra biome and finally the last paragraph is ocean or marine biome
Explanation:
rain forests have warm temperatures and include alot of animals and plants , artctic tundra biome includes cold temperatures ice stuff and all that and ocean or marine biome is pretty much just the ocean with seals , whales and marine life yk.
can someone help me with this please? i dont see the errors
Answers
Answer:
tooth paste should be together like "toothpaste"
Explanation:
when putting the phrase into a spell checker that is what it said to do, hope it helps
How does an atom change if all of its electrons are removed?
p.s. I'll mark the first answer the brainliest if it is correct! ;)
a. The atom’s volume increases.
b. The atom’s mass increases.
c. The atom becomes positively charged.
d. The atom becomes negatively charged.
Answers
c. The atom becomes positively charged
if the electrons are removed it means theres no longer a negative charge to balance the positive charge of the protons in the atom
What are six ethical concerns that people have about genetic modification?
Answers
Answer:
Potential Harm to Human HealthPotential Damage to the EnvironmentNegative Impact on Traditional Farming PracticeExcessive Corporate DominanceUnnaturalness of TechnologyCreate Unknown Side Affects or Outcomes
Answer:
1 potential harm to human health.
2 potential damage to the environment.
3 negative impact on traditional farming practice.
4 excessive corporate dominance.
5 and the 'unnaturalness' of the technology.
6 Create Unknown Side Affects or Outcomes
1. the rate of change in an object's position over time is called what
2. the type of energy that is the sum of kinetic and potential energy at any given time is what
3. A push Or pull that can change the motion of an object (examples: magnetic force, frictional force. Please Help me this is due tomorrow
Answers
Answer: 1 . velocity 2. total mechanical energy. 3. magnetic force
Answer:
1. Rise over run, slope, or velocity
2. Mechanical Energy
3. Temperature
It is a broad question
WILL GIVE BRAINLIEST
What is the density of an object with a volume of 34 cm^3 and a mass of
15 g
Answers
Answer:
Density= 0.4412g/cm^3
Explanation:
When finding density the formula is mass divided by volume. So the mass of 15g divided by 34cm^3 equals to the density of 0.4412g/cm^3.
Where does most fresh water exist?
Answers
Answer:
aquifers, ice caps, and glaciers I think
(C) aquifers, ice caps and glaciers
Who would most likely need thermal clothing?
A. a tourist on a tropical beach
B. an explorer at the South Pole
C. a dancer performing in a classical ballet
D. a woman attending a religious service
Answers
Answer:
B
Explanation:
Thermal clothing is something you wear under your regular clothing. It prevents you from getting chilly.
A is incorrect because usually a beach is warm and not really that cold. So, you would not need warm clothes.
C is incorrect because a dancer would not be most likely in need for thermal clothing. They would be okay.
D is incorrect because the woman is in a room and not it such a cold room that she would need really warm clothing.
Hope you have a great day;)
Help please... urgently! its worth 30 points
Answers
Explain how thinking about chemicals at the atomic and molecular scale can help to explain observable phenomena, such as the changes you see when you etch copper.
Answers
Not a straight up answer, but moreover to help you get it: (Circuit Boards)
Aside from the tasks it performs, perhaps the most important function of a circuit board is providing a way to integrate the electronics for a device in a compact space. A PCB allows components to be correctly connected to a power source while being safely insulated. Also, circuit boards are less expensive than other options because they can be designed with digital design tools and manufactured in high volume using factory automation.
Partially straight up, helping you get the answer: (Copper Chloride)
Copper(II) chloride is the chemical compound with the chemical formula CuCl 2. This is a light brown solid, which slowly absorbs moisture to form a blue-green dihydrate.
Etching helps us to see the structure of the atoms of copper.
What is etching?The term etching refers to the process by which we expose the inner structure of copper. It is usually done electrically or by the use of an acid. The surface of the copper is removed and the inner structure of the copper is shown.
As such, when you etch copper, you can see the inner structure such as the arrangement of the atoms of copper and how they fit together.
As such looking through the etched copper would help you to appreciate that matter is composed of atoms.
Learn more about etching of copper:https://brainly.com/question/28190564
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what might a scientist do to identify an organism that cannot be seen with a naked eye?
Answers
Answer:
I believe they would use a microscope.
Explanation:
Microscopes provide a higher magnification, so scientist use them to see things they cant quite see with a naked eye.
Can you help me with this assignment
5th-grade science
pls give the right answers and if you don't know the answers pls pls pls do not answer the question
Answers
Convex lenses can form magnified or minified inverted real images, or magnified right-side-up virtual images. Concave lenses can only produce minified, right-side-up virtual images.
You are given an unknown substance, which may be an acid or a base or may be neutral. To determine which, you will need to test for specific properties. Select the laboratory equipment below that would help classify this substance.
Answers
Inappropriate equipment-magnet, hot plate, beaker of water, conductivity tester, and balance
To determine the need to test for specific properties the equipment used is litmus paper.
What are specific properties?Specific properties are defined as a features of a material are generated from its other extensive and intensive properties. The uses of specific properties are Ranking, Classifying, and Comparing: Specific features can be used to compare two attributes while reducing the impact of differences in a third attribute.
Litmus paper is defined as a kind of paper that can be used to detect acidity because it changes color in relation to how acidic the solution it is dipped in is. As blue litmus paper turns red under acidic conditions, and red litmus paper turns blue under basic or alkaline settings, the primary application of litmus is to evaluate whether a solution is acidic or basic.
Thus, to determine the need to test for specific properties the equipment used is litmus paper.
To learn more about specific properties, refer to the link below:
https://brainly.com/question/13178675
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HMH Daily Demo Lab: Water Magic
Electric Charge (guided inquiry)
Purpose: To show how matter becomes charged by induction
Materials: comb, sink with working faucet
Predict: Predict what you think will happen to the charges of the comb and water if the comb comes in contact with the water. Record your hypothesis before following the directions below to carry out the lab experiment. The charges would attract. How and why is what I don’t know.
Directions:
1. Turn on a faucet just enough to allow a thin stream of water to flow.
2. Have a student volunteer-run a comb through his/ her hair a few times.
3. Observe. Tell the student to hold the comb near, but not touching, the stream of water.
4. Answer all questions below in complete sentences, using the R.A.C.E. strategy.
Ask and record your findings: What do you observe? Describe. I observed the stream of water bend toward the comb. I gave the comb electric charge by passing a comb through my sister’s hair and that allowed the comb to bend the stream of water.
Ask and record your findings: What does this indicate (show)? Explain. I
Observe:
1. To test students’ predictions, have the student volunteer pass the comb through the water.
2. Then have them move the comb so that it is near but not touching the water.
Ask and record your findings: What do you observe? Describe. WILL GIVE BRAINLIEST
Answers
Answer:
3
Explanation:
Explanation:
Please help me por favor :'(
Answers
Which is not one of the benefits of biodiversity?
Economic value
Uniform genetics in a species
Survival of species in the ecosystem
Cultural value
Answers
In total honesty I'll say economic value
Answer: Uniform genetics in species
Explanation:5 of the benefits of biodiversity is economic value,ecological life support, cultural value , recreational value, scientific value
A and D are out and c is the same thing as ecological life support.
How is the momentum of an object determined?
What happens every time one of the boys playing ping pong hits the ball?
How could the boy playing ping pong keep from hitting the ball off the table?
I GIVE 20 PTS PLS HEELP
Answers
Answer: He needs to hit the ball with less force.
Explanation:
hope this helps
2. Based off the answer to the first question, by hitting the ping pong ball, momentum is transferred from the boy to the ball. Causing the ball to have more velocity/speed and gain more momentum.
3. Momentum before = momentum after
Every time the ball hits the table, some momentum transfers from the ball to the table. Every time the player hits the ball, some momentum transfers from the player to the ball. This allows the player to continue playing ping pong as the ball always has momentum.