The andromeda galaxy is located approximate 2.5 million light-years from earth. Why is the light that Reaches earth 2.5 million years old

Answers

Answer 1
 its not. A 2.5 million light years 14696563432959 miles light years aren't actually years they're just another term for a certain amount of miles.

Related Questions

what is the density of a cube that has a mass of 25 grams and a volume of 125cm

Answers

Density = mass/volume

Density = 25 grams/ 125 cm³ = 0.2 g/cm³

The density of a cube that has a mass of 25 grams and a volume of 125cm will be 0.2 centimeter cube.

What is density?

The density of the material is defined as the mass of the substance per unit volume or it is the ratio of mass of the substance to the volume of the substance and the unit will be centimeter cube.

To calculate density the given formula is mass of material to the volume of material.

                   

density = mass / volume

                     mass = 25 grams        

                      volume = 125 cm

Substituting the value in the formula,

                  density = 25 / 125

                                = 0.2 centimeter cube.

Therefore, density of a cube that has a mass of 25 grams and a volume of 125cm will be 0.2 centimeter cube.

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how do atoms form a new substance

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Atoms form a new substance by bonding with different atoms.

For example, hydrogen atoms and oxygen atoms bond to form H2O as per this equation:

2H2 + O2 ---> 2 H2O

To understand how to hydrogen and oxygen atoms form water you can write that as:

2 H - H + O - O ---> 2 H - O - H

Each hypen represent a chemical bond.

What is happening is that the H - H atoms and the O - O separate and  bond with different atoms: H bonds to O which in turn bonds to other H.

Also, you have to know that chemical bonds are the result of interaction between the electrons of the valence shell of electrons of each atom. This is,  valence electrons from O interact with valence electrons of H to form the bond H - O.

The interaction may be in different ways depending on the properties of the atoms: the kind of bonds known are metallic, ionic and covalent.


what do you think he will found out when he swings the pendulum for 15 seconds

Answers

I believe he will find the frequency of the pendulum

Visible light represents a very small portion of the electromagnetic spectrum. Radiation to the left in the image, such as microwaves, has a longer wavelength than visible light. Radiation to the right has a shorter wavelength than is observable. Which radiation has a higher frequency than visible light?

Answers

x- ray is the answer, believe old dude if you want to.. I just had this question on USA Test Prep

Answer: It is xrays

Explanation: because  i got it right just trust me

During an investigation a scientist heated 27 g of mercuric oxide till it decomposed to leave a dry product. The total mass of the product formed was 25 g. Does the law of conservation of mass hold true in this case?

Answers

The law of conservation holds true always so there the last two grams has be lost as a gas probably

Answer:

Yes.

Explanation:

The law of conservation of mass holds true, because the mass missing is in gas form. The fact that matter can change, doesn't mean they violate this law of conservation.

So, this law is always happening.

What characteristic of the molecule is important for this force to be effective in bonding?

Answers

Van der Waals forces' is a general term used to define the attraction of intermolecular forces between molecules. The bigger the molecule, the bigger the force. 

Answer:

Van der Waals forces' is a general term used to define the attraction of intermolecular forces between molecules. The bigger the molecule, the bigger the force.

Explanation:

explain how the nettle is adapted for defence and protection

Answers

Stinging weeds have created stinging cells as an adjustment to hinder herbivores from eating them. The plants contain long, thin, empty hairs that cover most of the stem and the underside of the clears out. The dock abandons themselves contain oxalic corrosive, which deflects herbivores from eating them.

Answer:

In biology, adaptation has three related meanings. The definition that relates most to this question is given below:

Adaptation is the dynamic evolutionary process that fits organisms to their environment, enhancing their evolutionary fitness.

A Nettle plant also known as common nettle, stinging nettle nettle leaf, or just a nettle or stinger, is a herbaceous perennial flowering plant in the family Urticaceae with the ability to sting.

Explanation:

One of the biological traits that the nettle has is its ability to produce inflammatory effect (that is a burning stinging sensation on the skin known as "contact urticaria"). This unpleasant effect is achieved by impaling the skin of the animal via spicules. The spicules cause mechanical irritation.

The stinging effect is also achieved by the introduction of biochemical irritants such as histamine, serotonin and choline among other chemicals into the skin.

This sort of defence or protection mechanisam keeps animals away from the nettle.

Cheers!

What is the formula for germicide that is sufficient to kill blood-borne pathogens?

Answers

It is 1 ounce. Bloodborne Pathogens can be transmitted when blood or body liquid from a tainted individual enters someone else's body by means of needle-sticks, human chomps, cuts, scraped areas, or through mucous films. Likewise, semen, vaginal discharges and salivation in dental methods are considered conceivably tainted body liquids.

A sample of a substance that has a density of 0.824 g/mL has a mass of 0.451g. Calculate the volume of the sample.

Answers

Final answer:

The volume of the substance can be calculated by dividing the given mass (0.451g) by the density (0.824 g/mL). Therefore, the volume equals approximately 0.547 mL.

Explanation:

The subject of this question is the calculation of volume using the given mass and density of a substance. The density is defined as mass per unit volume. Thus, you can calculate volume by dividing the mass by the density.

For this specific question, the given mass of the substance is 0.451g and the density is 0.824 g/mL. To calculate volume, divide the mass by the density. So, Volume = mass/density = 0.451g / 0.824 g/mL = 0.547 mL.

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science question down below hurry

Answers

Tissues. Hope it helps (let me know if it was correct)
A.Tissues since none of the others would make sense.

list the major points in daltons atomic theory

Answers

1. all elements are made of small particles called atoms
2. atoms of one element are identical in their properties, different atoms from different elements differ in properties
3. chemical reactions consist of atoms rearranging in whole number ratios
4. atoms can not be subdivided, created, or destroyed

Dalton's atomic theory proposed that elements are made of atoms, which are indivisible and have specific mass and properties for each element. His theory also stated that atoms combine in fixed ratios to form compounds and cannot be created or destroyed in chemical reactions. Modifications have been made to this theory, as atoms can be divided and isotopes and nuclear reactions exist.

Dalton's Atomic Theory

John Dalton's atomic theory was a groundbreaking attempt to explain the nature and behavior of atoms. The main points of Dalton's atomic theory include:

Elements are composed of extremely small particles called atoms.

Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in these properties.

Atoms cannot be subdivided, created, or destroyed in chemical reactions.

Atoms of different elements can combine in whole number ratios to form chemical compounds.

In chemical reactions, atoms are rearranged, combined, or separated.

Despite its success, modifications to Dalton's atomic theory have been made. We now know that atoms can be divided into subatomic particles (electrons, protons, and neutrons), isotopes of elements can have different masses, and atoms can be transformed via nuclear reactions.

Always report their observations and results truthfully

Answers

The scientific method usage forms this specific ideal of thinking of the reality before them.

For the following experiment, write a possible hypothesis, and then identify the independent variable, dependent variable, and controlled variables. Susan wants to find the fastest route to drive to youth group. She can take the freeway, arterials, or residential roads on her way to youth group.

We discussed the importance of having only one independent variable, but trying to test more than one independent variable is an error many people make. In the following experiment, identify the errors that the experimenter made and summarize a valid way to test his research question: What cooking spray best keeps food from sticking to a pan? In the morning, Dan uses grapeseed oil to cook eggs for breakfast; for lunch, he uses vegetable oil spray to coat a muffin tray and cooks cornbread to eat with his chili; for dinner, he uses olive oil to pan cook a hamburger patty.

Design a simple experiment that you could conduct at home. What is your hypothesis? What are the independent, dependent, and…

Answers

1st question:
possible hypothesis: What is the fastest route to drive through to reach the youth group?
Independent variable: This would be the speed of the car she will be driving.
Dependent variable: The length of time it would take Susan to arrive in her destination using each route.
Controlled variable: The speed of the car she will be driving. This should remain constant in every route she takes. 

2nd question: 
What cooking spray best keeps food from sticking to a pan?

Dan used different independent variables and dependent variables. There is nothing to compare in each experiment because there is no controlled variable.

breakfast: grape seed oil in a pan to cook eggs.
lunch: vegetable oil spray in a muffin tray to cook cornbread
dinner: olive oil in a pan to cook a hamburger patty.

The cooking oil used are not all in spray form. The pan is only used in two occasions. Different type of food were cooked. 

Dan should used cooking oils in spray form. He should also use only one pan and only one type of food to determine whether said food will stick to the pan using a certain cooking oil spray.

Which factor causes a decrease in the rate of dissolution?

Answers

Decreasing the surface area of the solute.

Answer: Size of Solute and Surface area

Explanation:  Rate of dissolution is the speed at which the given solute gets dissolved in the given solvent.

Now this rate of dissolution depends on may factors like-

a) Size of Solute - If the solute size is bigger then it will take much more time to get dissolved. Thus smaller size solute are easily dissolved in the solvent.

b)  Surface area - If the surface area of the solvent is larger, then the collision between the solute and solvent will be much higher and thus rate of dissolution will increase.

Thus decreasing the surface area of solute will lead to decrease in the rate of dissolution.

How might a hurricane in Florida cause anomalous nest data

Answers

Assuming that the nests are bird's nests and the data is a data gathered by the biologists about those nests. 
A hurricane would cause some damage to the nests that is existent and cause a remarkably low count even during breeding season. It would also influence later birds because of population weakening due to the hurricane.

Why is it hard to prove the law when a gas is produced?

Answers

If you are referring to the law of conservation of mass when a gas is produced it is difficult to prove that because it would be virtually impossible to measure the mass of gas in a container as it would probably be similar in density to the air.

Chemical reactions occur when the starting materials called the reactants rearrange their electrons to create new bonds. It is very difficult to prove the law of conservation of mass in the case of gases.

What is law of conservation of mass?

According to the law of conservation of mass, mass can neither be created nor be destroyed. It can be converted from one form to another. The law of conservation of mass says that the mass of reactants must be equal to the mass of products.

The gas molecules move quickly into the outside space and away from the system. When a gas is produced, it quickly diffuses away from the site of synthesis making it difficult to measure the mass of the products.

So the law of conservation of mass cannot be proved in the case of gases. Randomness is found to very high in gas molecules, so that the measurement of mass is difficult and could not be accurate.

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Pleasssssssssssssssssss help me in this 4 question

Answers

hi, im guessing it's because when it cracks the cold inside gets released allowing warm air to replace the cold air

Starting with the unbalanced equation for the combustion of ethanol,

C2H5OH(l)+O2(g)→CO2(g)+?H2O(l)
what coefficient should be placed in front of H2O to balance the hydrogen atoms

Answers

C2H5OH +3O2 -> 2CO2+3H2O

Final answer:

The coefficient that should be placed in front of H2O to balance the hydrogen atoms for the combustion of ethanol is 3. After balancing the hydrogen atoms, the fully balanced chemical equation for the combustion of ethanol is C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l).

Explanation:

To balance the hydrogen atoms in the combustion of ethanol, we start with the unbalanced equation C2H5OH(l) + O2(g) → CO2(g) + H2O(l). Ethanol (C2H5OH) contains 6 hydrogen atoms, and since each molecule of water (H2O) contains 2 hydrogen atoms, we need 3 molecules of water to account for all the hydrogen atoms from ethanol. Therefore, the coefficient for H2O in the balanced equation is 3.

After placing 3 in front of H2O, the equation looks like this: C2H5OH(l) + O2(g) → 2CO2(g) + 3H2O(l), which balances the hydrogen atoms. To complete the balancing, the oxygen atoms also need to be accounted for. In the product side, there are a total of 7 oxygen atoms (4 from the 2CO2 and 3 from the 3H2O). There is 1 oxygen atom in the ethanol molecule, so we need 6 more oxygen atoms from O2, which means we need 3 O2 molecules. Thus, the coefficient for O2 is 3. The fully balanced equation is C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l).

What happens to the speed of molecules in water vapor when it condenses to form a liquid?

Answers

They slow down, i may be wrong
When water vapor condenses it changes from a gas to a liquid. During the condensation the speed of molecules is lower, which means that the molecules slow down and their attractions bring them closer together. 
Also, making water vapor colder increases the rate of condensation. The rate of condensation depends on the temperature.

Which layer of earth atmosphere contains no water vapor, has an atmospheric pressure less than 0.1 atmosphere, and has an air temperature that increases with altitude?

Answers

Well could u list the layers for me? It would be helpful to answer

the fuel tank of an automobile has a capacity of 14.8 gallons. if the density of gasoline is 42.0 lb/ft^3, what us the mass of fuel in kilograms when the tank is full?

Answers

The capacity of the fuel tank = 14.8 gallons.
Note that
1 US gallon = 0.13368 ft³.
Therefore the capacity is
(14.8 gals)*(0.13368 ft³/gal) = 1.9785 ft³.

The density of gasoline is 42.0 lb/ft³, therefore the mass of gasoline is
(42 lb/ft³)*(1.9785 ft³) = 83.097 lb.

Because 1 lb = 0.4536 kg, the mass is
(83.097 lb)*(0.4536 kg/lb) = 37.693 kg

Answer: 37.7 kg (nearest tenth)

A block has sides that are 2cm long, 3 cm wide, and 2cm high. What is the volume ?

Answers

volume= h*l*w
2*3*2=12cm
You're answer is 12cm.   Hope it helps!




which element is most reactive sodium,magnesium, or aluminum and why?

Answers

Magnesium would be more reactive.

Which of the following is a unit of volume in the English system of measurement? A. Meters B. Gallons C.liters per cubic gram D. Kilograms per cubic centimeter

Answers

b everything else is used in the uk

Answer :  The correct option is, (B) Gallons

Explanation :

English system : It is defined as the measurement system that is used in many countries including the United States.

The English system measured the things in feet, inches and mile for length, ounce, ton, pint and gallons for volume.

As per question, we conclude that  the unit of volume in the English system of measurement is gallons.

Hence, the correct option is (B) Gallons

What is a boundary between geologic units?
geologic map

geologic unit

contact

fault line

Answers

faulty line would be the result of an earthquake 
the answer to this question is Contact
depending on the geological event that put into place, this will have a specific semantic value.
A contact usually represented by different kind of lines on the geological map and usually use to determine where rocks come into contact across fault zones

What is the difference between a terrestrial planet and a gas giant

Answers

Gas Giants are usually bigger than Terrestrial Planets. Gas Giants also have thicker atmospheres, and have gaseous surfaces. Terrestrial planet tend to be smaller, and have solid surfaces. In our solar system, Mercury, Venus, Earth (home), and Mars are Terrestrial planets.  While Jupiter, Saturn, Uranus (the planet), and Neptune are Gas Giants. Gas Giants are also known as Jovian planets.

Give the number of significant figures: 0.011 cm

Significant figures:

Answers

There are 2 significant figures

Answer:

Significant figures: 2

Explanation:

There are 2 significant figures since the zeros at the left side don’t count and the number can be expressed in its scientific notation as 11x10-3 cm

What advantage do computers give scientist as tools for investigations?

Answers

Computers are the most important role of technology. It has been used in variety of purposes like digital and electronic evidence . Computer forensics' main advantage is its ability to search and analyze large volume of datas quickly and and efficiently. computer forensics field and other field it has been helpful to identify wherein important datas that has been deleted, lost or damaged that can be retrieved easily.

why is the principle about the relationship between mass volume always true of substances , but not always true for mixtures

Answers

For pure substances, the mass and volume will always be the same or will always change the same way because all substance are the same throughout.

While for mixtures, you can have varying amount of each component therefore mass and volume will not change the same way for substances.

How many atoms are equal to 1.5 moles of helium

Answers

One mole substance there are [tex]6.02 \times10^2^3[/tex] elementary chemical entity present.  1.5 moles of Helium, there are  [tex]\bold{9.03 \times 10^2^3}[/tex] atoms present.

Mole Concept:

In one mole substance there are [tex]6.02 \times10^2^3[/tex] elementary chemical entity present.

This number is as many as Carbon atoms present in 12g of Carbon 12. [tex]6.02 \times10^2^3[/tex] is also known as Avogadro's constant.

As we know 1 mole = [tex]6.02 \times10^2^3[/tex]

hence,

1.5 moles of Helium = [tex]1.5 \times 6.02 \times10^2^3 = \bold{9.03 \times 10^2^3}[/tex]

Therefore we can conclude that in 1.5 moles of helium, there are  [tex]\bold{9.03 \times 10^2^3}[/tex] atoms present.

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