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

Answers

Answer 1
I believe he will find the frequency of the pendulum

Related Questions

which of these id an indication that a chemical reaction has occurred?

A) formation of a gas

B) boiling of a substance

C) melting of a substance

D) freezing of a substancd

Answers

Bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
I think the answer is B

After you add water to the sand-salt mixture what happens when you pour it through a filter??

Answers

I think when you mix sand, salt and water, salt will dissolve in the water and sand will not. When you about to filtrate the mixture, sand will be left in the filter paper, and the salt solution will pass through. If you wish to separate salt from water, just do evaporation. 
The water with the salt dissolved it it will go through filter and the the sand will not. So, the sand and salt will separate

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

Answers

Magnesium would be more reactive.

Which of these is not a challenge an organism encounters

Answers

staying healthy
 that is the answer

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.

What best describes the degree to which a material can transmit Heat A:melting point B:boiling point C: thermal conductivity D: electrical conductivity

Answers

Your answer is going to be C
C. Thermal Conductivty

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:

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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how do atoms form a new substance

Answers

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.


How many newtons are necessary for a 6,000 g mass to accelerate at a rate of 2.5 m/s2.

Answers

the answer is 15000 Newton's
hope this helps!

Formula Mass for AgNO2

Answers

153.88 g/mol is the formula mass

The formula mass of AgNO₂ is approximately 153.88 amu.

To calculate the formula mass for AgNO₂, add the atomic masses of silver (Ag), nitrogen (N), and oxygen (O). Silver has an atomic mass of 107.87 amu, nitrogen is 14.01 amu, and oxygen is 16.00 amu. Since there is one nitrogen atom and two oxygen atoms in nitrite (NO₂), you compute the mass of NO₂ by adding the atomic mass of nitrogen to twice the atomic mass of oxygen.

Formula mass of AgNO₂ = atomic mass of Ag + atomic mass of N + (2 × atomic mass of O)
= 107.87 amu + 14.01 amu + (2 × 16.00 amu)
= 107.87 amu + 14.01 amu + 32.00 amu
= 153.88 amu

Therefore, the formula mass of AgNO₂ is 153.88 amu.

The complete question is:

What is the formula mass of AgNO₂?

Identify the compounds that can be deprotonated by −OH

Answers

HELP PLEASE!! 

What are some compounds that are made out and a simple molecule?
( Please something else rather than water! )

And what does it look like?
Chemical formula?
Compound name?

PLEASEE HELPP!! THANK YOU TO THE HELPERS!

The compounds that can be deprotonated by −OH are formic acid and hydrogen sulfide.

What is Deprotonation?

Deprotonation may be defined as the process of elimination of a proton from a Bronsted-Lowry acid in an acid-base reaction. Deprotonation does not refer to the ejection or removal of a hydride ion (H-). The process of deprotonation actually removes a +1 charge from a chemical compound.

Formic acid (HCOOH) and hydrogen sulfide (H2S) is typically compound that can be deprotonated through the mechanism of deprotonation.

Such types of compounds are easily ionized in the forms of ions like HCOO- and H+. The deprotonation of such compounds is facilitated by the delocalization of protons to other instable form.

Therefore, the compounds that can be deprotonated by −OH are formic acid and hydrogen sulfide.

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convert 25 kilometers to meters

Answers

25,000 meters is youre answerr
There are 1 kilometers in 1000 meter, and so

25 km x 1000 (conversion unit) = 25000 (meters)

your answer is 25000 meters

hope this helps 

Which expression of distance uses SI units?
A.
30 miles
B.
16 kilograms
C.
24 feet
D.
500 meters

Answers

SI stands for International system of units. Metre is a conventional unit of measuring distance.

Thus, option D is correct.

What is SI unit?

The International system of units contains the base units for quantifying any object, quantity or a substance.  The standard unit for measurement is the same world-wide.

It remains unchanged and is accepted universally. SI units remains the same in any language, in any field or area and in any condition.

SI unit is taken as the quantity of need. Any derived values are not included in SI units.

There are seven standard units included in SI system. SI units are devised for measurement of time, mass, length, temperature, current etc.

Using SI unit for measurement provides accuracy and consistency. The problem could be viewed in one dimension by all and thus solved appropriately with standard measurements.

Therefore, SI unit forms a fundamental unit for quantification in metric system.

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Which statement best describes the difference between a physical change and a chemical change

Answers

physical change happens alone without adding chemical but by doing things  but you add chemicals and other things to have chemical change

The best statement describing the difference between a physical change and a chemical change is that a physical change involves a change in the state of matter, while a chemical change results in forming a new substance. Correct option is: B.

The difference between a physical change and a chemical change can be best described with the following statement:

B. A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.

Physical changes involve changes in the state of matter (e.g., ice melting into water, water evaporating into steam) without altering the chemical composition of the substance.

On the other hand, chemical changes involve breaking and forming chemical bonds, resulting in the formation of new substances with different chemical properties (e.g., hydrogen and oxygen reacting to form water).

Examples of physical changes include melting, freezing, condensation, and evaporation. Examples of chemical changes include combustion, oxidation, and reactions that produce gas or precipitate.

Complete Question: -

Which statement best describes the difference between a physical change and a chemical change?
A. A chemical change results in a new element being formed, and a physical change results in a new compound being formed.
B. A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.
C. A chemical change does not result in a new substance being formed, whereas a physical change does.
D. A physical change produces a new element, and a chemical change results in a bond breaking between atoms.

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

The table lists the chemical formulas or symbols of a few common substances. Which two substances are compounds? A) aluminum and iron B) iron and sodium chloride C) carbon dioxide and aluminum D) sodium chloride and carbon dioxide

Answers

D is the correct answer

every other option contains an element

Each elements, molecules and compounds have their own formula to identify them. The two compounds in the given lists are sodium chloride and carbon dioxide.

What are compounds?

Compounds are chemical substances formed by the combination of two or  more different elements. For example water is a compound formed from two hydrogens and one oxygen atom.

Combination of same atoms forms molecules but not compounds. Sodium, iron, aluminum  ets are single atoms and not compounds. There are different types of compounds such as ionic compounds, covalent compounds, coordination compounds etc.

The compounds are classified based on their bond type, composition etc. sodium chloride (NaCl) os an ionic compound of sodium and chlorine. Similarly carbon dioxide is a covalent compound formed from carbon and oxygen atoms.

Hence, the two compounds in the given lists are sodium chloride and carbon dioxide.Thus, option D is correct.

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Justine observed that the water level in a dish placed on the window sill decreased after a few days, and vapor formed. What best explains that she observed a physical change? Vapor can be easily condensed back to form water. Water and its vapor react with substances in different ways. The molecular composition of water changed when the water level decreased. Bonds between hydrogen and oxygen broke when the water level changed.

Answers

Physical change, heat caused this.

Water molecules that only vibrate are in solid form. If heat energy is added, the molecules will speed up their vibrations until they can break loose from the organized pattern of a solid and begin to slide over each other, changing to liquid state. If more heat energy is added, the molecules will speed up more and move randomly in all directions as a gas/vapor. Removing heat energy will reverse these changes.

yes the answer would be A. Vapor can be easily condensed back to form water. I know because I took this exam and had this question too.

True or false forces on earth are different from those elsewhere in the universe

Answers

False, other planets have things we have not discovered yet, but for one thing for sure there are storms and hurricanes on other planets as well.

Always report their observations and results truthfully

Answers

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

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

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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is sodium hydroxide dissolves in water a physical change

Answers

Yes, because when something is desolated in water, it can be undone. If it couldn't be undone, then it would be chemical.

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.

The following neutral atoms each have 8 places for electrons in their outermost shells.

Which atom will tend to lose rather than gain 1 or more valence electrons when forming an ion?

a. Li with 1 valence electron
b. O with 6 valence electrons
c. Ne with 8 valence electrons
d. F with 7 valence electrons

Answers

c. ne with 8 valenc3 electrons

Answer:

a. Li with 1 valence electron

Explanation:

For this it is necessary to see the electronegativity of this atoms. The electronegativity is the force or tendency that has an atom to attract electrons, so the atom who has the lower value of electronegativity is the one that will tend to lose rather than gain electrons.

The electronegativity of these atoms is:

Li – 0.98

O – 3.44

F – 3.98

Ne is a noble gas so has no tendency to gain nor lose electrons

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

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.

A neutral chlorine atom has 17 protons and 18 neutrons. How many electrons does it have?
A. 16
B. 17
C. 18
D. 19


(And if you want please explain how you get the answer.)

Answers

The atom has as many electrons as protons.
The correct answer is b) - 17 electrons.

:)

Answer : The correct option is, (B) 17

Explanation :

Atomic number is defined as the number of protons or number of electrons.

Atomic number = number of protons = number of electrons

Mass number is defined as the sum of number of protons and number of neutrons.

Number of neutrons = Mass number - Number of protons

As we are given that:

Number of protons in chlorine atom = 17

Number of neutrons in chlorine atom = 18

For neutral atom :

As, Atomic number = number of protons = number of electrons

So, Number of electrons in chlorine atom = Number of protons = 17

Hence, the correct option is (B) 17

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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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.
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