♦Will mark brainliest♦
Answer all Questions And will mark brainliest if not will not mark
When swinging on a park swing when is your kinetic energy the least?

Question 1 options:

Kinetic energy is least at the lowest point of your swing when you are closest to the ground.


Kinetic energy is the least when you are halfway between the highest point of the swing and the bottom.


Kinetic energy is least at the at the top of the swing when you are still for a moment just before falling again.


Kinetic energy is least as you are moving past the bottom of the swing and going back up to the highest point.

Question 2 (3 points)
In the EXPLORE section of your lesson 4.08 on Potential energy there were several animations to watch that provided a graphic illustrating how the PE and KE in a system changed as a skateboarder rides a halfpipe or a pendulum moves, why did the bar for the total energy remain constant?

Question 2 options:

all answers given are correct


Because these models do not take into account the impact of friction and air resistance and are helping to solidify the concept of energy conservation and that the total mechanical energy remains constant in that model.

Energy is converted from kinetic to potential and potential to kinetic, but the total amount of energy is conserved.

This is because no energy is being created or destroyed in this system

Question 3 (3 points)
Studying energy involves determining the amount of energy an object has. This energy can be kinetic or potential, or it could be a combination of both. Consider a 2-kg bowling ball sits on top of a building that is 40 meters tall. It falls toward the ground. Think about the amount of kinetic energy the bowling ball has as it falls, select when the ball would have the most kinetic energy from the choices given.

Question 3 options:

after it hits the ground and is no longer moving.


as it sits on top of a building that is 40 meters tall.


as it is halfway through the fall and it has reached a speed of 19.8 meters per second.


just before it is to hit the ground and it has reached a speed of 28 meters per second.

Question 4 (3 points)
How can you increase the gravitational potential energy (GPE) of an empty shoe box on the middle shelf of a bookcase?

Question 4 options:

raise the box to a higher shelf


add items to the box and raise it to a higher shelf


all of the options listed here will increase the GPE


add items to the box to increase its mass on the self it is on

Question 5 (3 points)
Which is an example of an object increasing its kinetic energy

Question 5 options:

an airplane after parking at the gate on the airport runway


a rocket resting in the docking claps just before the launch sequence it to begin


a jogger running faster after spotting a mountain lion following him on the trial


a train that is no longer moving and has come to a complete stop at the station platform so people can board

Question 6 (3 points)
Changing which factor would NOT influence the total kinetic energy of a moving shopping cart?

Question 6 options:

Decreasing the mass or the speed of the cart


increasing the rate of speed you push it down the aisle


increasing the mass of the cart by adding items while moving


Turning a different direction at the end of the aisle while continuing to move at the same speed.

Question 7 (3 points)
Mechanical energy is defined as

Question 7 options:

potential energy


Energy of machines and tools


the energy of motion and position, which is represented by the formula KE + PE = ME


Energy of motion

Question 8 (3 points)
Two children are waiting to go down a slide. The first child goes down and then stays sitting at the bottom of the slide. If there is no friction involved and all of the mechanical energy is conserved what would happen to the energy of the second child from the top to the bottom of the slide?

Question 8 options:

All energy stays the same, it does not change


The energy is destroyed


Kinetic energy would turn in to Potential energy at the bottom


Potential energy from the top of the slide would turn to Kinetic energy as they slide down, in turn the kinetic energy of the child coming down the slide will be given to the child sitting at the bottom when they collide.

Question 9 (3 points)
Conservation of mechanical energy is defined as

Question 9 options:

Energy of motion


Potential energy added to kinetic energy


Law of conservation of energy


The sum of the kinetic and potential energies of an object remains a constant value unless there are forces acting on the object that cause a loss of energy overall, such as friction and air resistance

Question 10 (3 points)
Which is an example of gravitational potential energy only.

Question 10 options:

a puppy walking around under a tree


an apple resting on the teacher’s desk


a rolling skateboard going down a hill


an elevator moving up to the 3rd floor

1. The right atrium 2. veins 3. lungs 4. heart valves. 5. pulmonary artery   6. Lungs 7. pulmonic valves 8. left atrium.

Circulation is the process by which your heart continuously pumps around five liters (eight pints) of blood throughout our body. our cardiovascular system is made up of our heart, blood, and blood arteries (or heart and circulatory system). Because the majority of the oxygen has been used up by the body and brain, the right side of the heart receives blood that is deficient in oxygen. our lungs then take in a new supply of oxygen as a result of this being pumped to them. In order to be pumped back out to the brain and the rest of our body, the blood then travels back to the left side of the heart.

Learn more about blood here-

https://brainly.com/question/17030548

#SPJ9

Answer:

0.25 g/cm

Explanation:

First, you multiply 10 *10 *10 and you get 1000. Then you divide it by 4000 and since 1000 is 1/4 of 4000 you get 0.25 or 1/4.

Please mark brainliest.

Answer: 4.136 g

Explanation:

1000 mg=1 g

4136 mg * 1 g/1000 mg=

4136*1/1000=

4136/1000=4.136 g

Mole fraction of ethylene is = 0.144  

How to find mole fraction ?

As, Given that vapor pressure = 7.88 torr

pure water vapor pressure = 9.21 torr

∆P solvent = (X Solute)(Pº solvent)

∆Psolvent = change in vapor pressure = 9.21 torr - 7.88 torr = 1.33 torr

Xsolute = mole fraction of the solute = ?

Pºsolvent = vapor pressure of the pure solvent = 9.21 torr

1.33 torr = (Xsolute)(9.21)

Xsolute = 1.33 torr/9.21 torr)

Xsolute = 0.144

Hence the mole fraction of ethylene is = 0.144  

learn more about mole fraction is here :

https://brainly.com/question/14783710

#SPJ4

Titanium (Ti,) atoms bond with Oxygen (O,) atoms. covalent type of bond  hold them together.

An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond.

When atoms share electrons, a permanent equilibrium of the attractive and repulsive forces between them is known as covalent bonding.

These electron pairs are referred to as shared pairs or bonding pairs.

Thus ,Titanium (Ti,) atoms bond with Oxygen (O,) atoms. covalent type of bond  hold them together.

To learn more about Covalent bond, refer to the below link:

https://brainly.com/question/11674395

# SPJ1

Answer:

Explanation:

in metal IE 1 < IE 2 < IE 3. why

Answer:

Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons.

Iron l is said to have a high permeability. High coercivity, high retentivity, and high permeability materials make up the permanent magnets. An object made of a substance that has been magnetized and produces its own persistent magnetic field is referred to as a permanent magnet.

In contrast to an electromagnet, which is made of a coil of the wire wrapped around a ferrous core and needs an electric current to create a magnetic field, a permanent magnet's magnetism is "always on" and it creates its own permeability magnetic field. A common example is a refrigerator magnet used to the keep notes on the door of the refrigerator.

To learn more about permeability, click here.

https://brainly.com/question/22370062

#SPJ4

Substance X - compound because it is a combination of elements

Substance Y - Mixture because it is a  combination of substances

Substances Z - Element because it contains atoms

Substance T -   compound because it is a combination of elements

We know that an atom is the smallest particle of a substance that can take part in a chemical reaction. A compound is formed by a mixture of atoms. An element is obtained as the smallest independent part of a substance.

Now let use classify the samples shown in the images attached.

Substance X - compound because it is a combination of elements

Substance Y - Mixture because it is a  combination of substances

Substances Z - Element because it contains atoms

Substance T -   compound because it is a combination of elements

Learn more about compounds:https://brainly.com/question/13516179?

#SPJ1

AlT₂B₂ (where T=Fe, Mn, Cr) and AlFe₂₋ₓMnₓB₂ were formed by a technique referred to as arc-melting.

By victimization arc melting to form the quaternary phases AlFe2-xMnxB2 and therefore the ternary phases AlT2B2 (T=Fe, Mn, Cr), these materials are studied and represented.

AlT₂B₂ (where T=Fe, Mn, Cr) and AlFe₂₋ₓMnₓB₂ were formed by a technique referred to as arc-melting.

AlMn₂B₂ and AlCr₂B₂ don't carries with it any form of magnetic ordering.

Nonmagnetic and magnetic attraction cluster in AlFe₂–xMnₓB₂.Ferromagnetism is suppressed by weakening of antibonding T–T interactions.The third phases AlT₂B₂(whereT=Fe, Mn, Cr) and fourth phases AlFe₂–xMnₓB₂ that are shaped by Arc-Melting and powder by X-ray diffraction.

The activity of magnet tells that AlFe₂B₂ could be a ferromagnet with Tₓ=282 K. AlMn₂B₂ and AlCr₂B₂ don't show any form of magnetic ordering within the studied of temperature vary of one.8–400 K.A systematic investigation of solid solutions AlFe₂−xMnxB₂ showed a non-linear modification. The magnetic attraction ordering temperature is step by step small because the content of Mn will increase.Calculation of Quantum chemical and crystal orbital Hamilton population analysis provides a transparent rationalization of the excellence in properties of series of compounds.

Thus, we are able to say that, AlT₂B₂ (where T=Fe, Mn, Cr) and AlFe₂₋ₓMnₓB₂ were ready by a technique referred to as arc-melting.

Learn more regarding Arc Melting here

https://brainly.com/question/17701622

#SPJ4

A yellow-gold sphere has a mass of 15.2 g when passes in the orange liquid with volume 43 mL

Density= mass/volume

Density = 15.2 g/ 43mL

Density = 0.35 g/mL

Question is to find density

The solubility of water is useful in maintaining various life processes because its capability to dissolve a variety of molecules.

Water is a “universal" solvent.

The ability of water to function as a versatile solvent arise from the structure of water molecules are because:

Water molecules form hydrogen bonds with atoms that are part of polar covalent bonds other molecules.

Water's versatility as solvent arises from the polar covalent bonds of water molecules.

Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.

In water, atoms of hydrogen (H) and oxygen (O) are connected by polar covalent bonds.

Covalent bond is bond between nonmetals. Hydrogen and oxygen are nonmetals.

Solvation is the interaction of solvent (water) with molecules or ions (for example K⁺ and I⁻) in a solute.

More about water solubility: brainly.com/question/24453293

#SPJ4

Rutherford conclusion was: Inside of the gold atom consists of empty spaces.

Rutherford theorized that atoms have their charge concentrated in a very small nucleus.

This was famous Rutherford's Gold Foil Experiment: he bombarded thin foil of gold with positive alpha particles (helium atom particles, consist of two protons and two neutrons).

Rutherford observed the deflection of alpha particles on the photographic film and notice that most of alpha particles passed straight through foil.

That is different from Plum Pudding model, because it shows that most of the atom is empty space.

More about Rutherford model: brainly.com/question/6708627

#SPJ4

The temperature of liquid nitrogen (LN), an inert cryogenic fluid, is 196 °C (320 °F). To drop the temperature of the concrete as much as is possible without causing it to freeze, LN is directly injected by lances into the batch water storage tank, the aggregate, or the mixer.

Cryopreservation is the process of preserving live cells, tissues, and other biological samples by placing them in a deep freezer at extremely low temperatures. The sample is typically stored at 196°C or lower. All of a cell's biological processes come to an end at such low temperatures, and the cell dies.

Learn more about Cryopreservation here:

https://brainly.com/question/24314907

#SPJ4

Percentage yield = 87.3%

How to find percentage yield ?

As ,the reaction is :

4Fe + 3O2 →2Fe2O3

Molar mass of Fe = 55.8 g

Molar mass of Fe2O3= 159.6 g

According to the balanced equation :

This is the theoretical mass obtained .

Actual mass is 4.77

So, % yield is = (actual /theoretical )/100 =( 4.77/5.46 )/100 = 87.3%

learn more about percentage yield here :

https://brainly.com/question/14714924

#SPJ4

If you see the nuclide notation of uranium (u).

The letter in the mid is the symbol of the element.

The number in the bottom left corner is atomic number (Tells you the number of protons)

The number on the upper left corner is the mass number (equal to the mass number ; = the neutrons and protons added together)

At the last, the charge is on the upper right corner, if there is no +ve and -ve symbol then the charge is neutral.

To find the number of neutrons, protons and electron :

1. No. of protons = Atomic Number (Z)

2. No. of neutrons = Mass number (A) - Atomic number(Z)

3. No. of electrons = Atomic number - Charge

To find the charge it is find by the periodic table suppose group 1 alkali metals have +1 charge and in the same way group 16 -2 charge .

Uranium is a radioactive element and hence it is an alpha particle and hence it has a positive charge.

There are many radioactive element who are alpha particles like thorium and plutonium. Beta particles have negative charge.

To know more about Radioactive element here :

https://brainly.com/question/23759636?referrer=searchResults

#SPJ1

The empirical formula of the compound is Fe2O3 and its name is Iron(III) oxide or ferric oxide.

The oxide of iron has 70% of iron by mass.

This means that in every 100 grams of this oxide,70 grams is of iron and the other 30 grams are of oxygen.

To calculate the empirical formula, we have to first find the number of moles of iron and oxygen by dividing the given mass by their molar mass.

Moles of iron = 70/56 = 1.25 moles

Moles of oxygen = 30/16 = 1.875 moles

Now we need to divide the moles of iron and oxygen by the lowest common number i.e. 1.25

Moles of iron/1.25 = 1.25/1.25 = 1

Moles of oxygen/1.25 = 1.875/1.25 = 1.5

The ratio of iron(Fe): to oxygen(O) comes out to be 1:1.5.

Hence, we should multiply this ratio by 2 to get a whole number.

The ratio of Fe:O comes out to be 2:3.

Thus, the empirical formula of the compound is Fe2O3 and its name is Iron(III) oxide or ferric oxide.

To know more about "iron oxide", refer to the link given below:

https://brainly.com/question/18500540?referrer=searchResults

#SPJ4

Answer:

either (a) or (b)

The charge on histone octamer at ph7 is +146.

To know more about histone visit:

https://brainly.com/question/13647139

#SPJ4

17.85 mL of 3.0 M stock solution of nitric acid is needed to make a 150 mL 0.357 M nitric acid.

The dilution of a stock solution can be solved by using the formula below, which indicates that the concentration of the solution changes but the number of moles of the solute remains the same.

(concentration of stock solution)(volume of stock solution) = (concentration of diluted solution)(volume of diluted solution)

Given:

(3.0 M)(volume of stock solution)=(0.357 M)(150 mL)

volume of stock solution = [(0.357 M)(150 mL)] / (3.0 M)

volume of stock solution = 17.85 mL

To learn more about the dilution process, please refer to https://brainly.com/question/27097060.

#SPJ4

The balanced chemical equation is CaCO3---> CaO+CO2 and the mass of the used limestone is 5.0 kg

The heating of limestone yields calcium oxide and carbon dioxide. It is a decomposition reaction.

The reaction is as follows;

CaCO3---> CaO+CO2

According to the law of conservation of mass, mass is conserved in a reaction,

So the mass of limestone used will be (2.8+2.2=5.0 kg)

To learn more about conservation of mass visit:

https://brainly.com/question/13383562

#SPJ1

Amount of water form will be 2.925 gram

2H2 + O2 -------> 2H2O

4 gram + 32 gram 36 gram

2 moles + 1 mole 2 mole

Moles = Given mass/molar mass

Moles of Oxygen = 2.6 gram/32gram = 0.08 moles

Moles of Hydrogen = 3.5 gram/2 gram = 1.75 moles

Here, we can see that Oxygen moles are less than Hydrogen moles so it is the limiting reagent and it will determine how much water will be formed

The substance that is entirely consumed at the end of the chemical reaction is known as the limiting reagent. This limiting reagent is required for the reaction to proceed since it limits the amount of product that can be produced.

32 gram of O2 produces water = 36 gram

1 gram of O2 produces water = 36/32 = 1.12 gram

2.6 gram of O2 produces water = 1.12 x 2.6 = 2.925 gram

Hence, amount of water form will be 2.925 gram

Learn more about Limiting reagent here:

https://brainly.com/question/14222359

#SPJ9

Properties that cannot be observed are due to the structure of atoms and molecules that can be observed.

The correct option is True.

A molecule is a group of two or more atoms held together by attractive forces known as chemical bonds.

It is true that properties that cannot be observed are due to the structure of  the atoms and molecules of that matter.

Physical properties are often referred to as those properties we can observe with our eyes.

Molecules made up of two or more elements are called compounds Example of molecules includes water, calcium oxide, glucose etc.  

Learn more about molecules at: https://brainly.com/question/773170

#SPJ1

Answer:

A half life is the amount of time it takes for half of a mass of a given radioactive element to decay to something else. 36 days is 4 1/2 life cycles, so by running  1/2*4  , we get how much of the original substance would be left. That would be 1/16 of the original substance left.

Explanation:

Of course, this is not always perfect, and can vary. In addition, if less than 16 atoms of the original substance are present, there is instead a  1/16∗a  chance of at least one remaining.

The amount of substance left after 39 days will be 1/16th of the original amount.

The half-life period of the radioactive material can be defined as the time required to reduce its actual amount to half after disintegration. The half-life period of a radioactive substance is independent of the initial amount of the substance.

Consider that N₀ is the initial amount of the substance

Consider that 'n' is the number of half-lives of given substance.

The time for which substance decay, t = 36 days

Half-life of substance (t½) =  9 days

t = n ×t½

36 = n × 9

n = 4 days

Assume that N is the amount of the substance after decay for 39 days.

N ×2⁴ = N₀

N × 16 = N₀

N = N₀/16

Therefore, one-sixteenth of the initial amount of the substance will be left after 39 days.

Learn more about half-life period, here:

brainly.com/question/14521252

#SPJ2

The concentration of a basic solution is determined by the degree of dissociation of base molecules in solution (option B).

A basic solution is an aqueous solution containing more OH-ions than H+ions.

In other words, a basic solution can be said to be an aqueous solution with a pH greater than 7, which is the neutral range.

The concentration of a basic solution is a function of the OH- ions in the solution. Therefore, the concentration of a basic solution is determined by the degree of dissociation of base molecules in solution.

Learn more about basic solution at: https://brainly.com/question/3595168

#SPJ1

The cell potential at 250c for the following galvanic cell

pb(s)|pb2 (1.0m)||cu2 (1.0 x 10-4 m)|cu(s)

is 0.345V.

It is a device that is used for the conversion of the electrical energy of the redox reactions into a chemical energy.

The reaction in which reduction and oxidation reaction both take place in the reaction is known as redox reaction.

Oxidation reaction are those reaction in which compound or substance looses its electron. In this type of reaction, oxidation state of an element increasing.

Reduction reaction are those reaction in which compound or substance accept the electron. In this type of reaction, oxidation state of an element goes on decreasing.

Reaction at cathode:

Cu+2 + 2e ------ Cu E°(anode) = -0. 126V

Reaction at anode:

pb ------- pb(+2) + 2e E°(cathode) = 0.337

E°cell = -0.126 -0.337

= -0.463V.

As we know that,

E cell = E°cell -0.059/2(log([cathode]/[anode])

= -0.463 - (0.059/2) × (-4)

= -0.463 + 0.118

= 0.345V

Thus, we concluded that the cell potential at 250c for the following galvanic cell

pb(s)|pb2 (1.0m)||cu2 (1.0 x 10-4 m)|cu(s)

is 0.345V.

learn more about redox reaction:

https://brainly.com/question/13293425

#SPJ4

The volume of 0.3 M oxalic acid(C2H4O2) solution containing 22.5 grams of oxalic acid is 833.3 ml.

The molarity(M) of a solution can be expressed by the following formula,

Molarity(M) = Mass of solute/Molar mass of solute x 1000/Volume of the solution

We are given that, the molarity of a solution containing 22.5 grams of oxalic acid(Molar mass= 90 g) is 0.3 M.

Putting these values in the given formula, we can calculate the volume of the solution

0.3 = 22.5/90 x 1000/V

V = 22.5/90 x 1000/0.3

V = 833.3 ml.

Thus, The volume of 0.3 M oxalic acid(C2H4O2) solution containing 22.5 grams of oxalic acid is 833.3 ml.

To know more about "oxalic acid", refer to the following link:

https://brainly.com/question/11101969?referrer=searchResults

#SPJ1

Answer:

•Melting of solid ice

• Evaporation of liquid

• Sublimation of solid cheese

since we don’t know the examples I can’t really answer your question but I can say a physical change alters the form or appearance of matter but doesn’t turn any substance in the matter into a different substance once you provide me with the examples I’ll let you know ok