The vapor pressure of the solution can be calculated using the expression of Clausius-Clapeyron equation. Putting the value of 23.5g of glycerin in 130g of methanol in the equation we get the result.
The vapor pressure can be defined as the force that an evaporating substance exerts against the walls of a sealed container.
ln (P1/P2) = (ΔHvap. /R) (1/T2 - 1/T1)
Here where P1 and P2 are the vapor pressures at two temperatures T and T2 . Clausius - Clapeyron equation allows to estimate the vapor pressure at another temperature if the vapor pressure is known at some temperature and if the enthalpy of vaporization is known. The partial vapor pressure of a component in a mixture is equal to the vapor pressure of the component at that temperature multiplied by the component's mole fraction.
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What statement best describes the transfer of energy in the photo?
B. when water changes state from a solid to a liquid, thermal energy is absorbed.
What is transfer of energy?The process of moving energy from one system to another, such as through the transmission of heat, work, or mass, is known as energy transfer.
It should be noted that the transformation of energy into another form or the transfer of energy from one location to another.
The mode of energy transfer are:
RadiationConduction, and Convection of Heat EnergyIn summary, thermal, radiant, chemical, nuclear, electrical, motional, acoustic, elastic, and gravitational energy are some of the different types of energy.
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water molecules are composed of an oxygen atom and 2 hydrogen atoms. which atom is the more electronegative atom?
Answer: Oxygen is more electronegative than the two hydrogen atoms. I hope this helps!
Explanation:
This is due to their electrons in their covalent bonds, they are closer to the oxygen atom then the two hydrogen atoms.
Luis5385
04/28/2018
Chemistry
High School
answered • expert verified
The tendency for a replacement reaction to occur increases as the _____. interval between any two elements in the activity series decreases temperature decreases valence electrons are used up interval between any two elements in the activity series increases
Option (d) is correct. The tendency for a replacement reaction to occur increases as the interval between any two elements in the activity series increases.
A replacement reaction is said to be a reaction occurs when elements switch places in compounds. This reaction involves ions. In this type of reaction more reactive elements replace less reactive elements. A replacement reaction occurs when one element replaces another element in one compound. here, less reactive elements replaced by more reactive elements. so, larger the interval between the elements in the activity series the greater the tendency for the replacement reaction to occur.
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The complete question is,
The tendency for a replacement reaction to occur increases as the _____.
(a) interval between any two elements in the activity series decreases ( b) temperature decreases
(c) valence electrons are used up
(d) interval between any two elements in the activity series increases
How many molecules of carbon dioxide (CO2) will be produced when 36.60 g of benzene (C6H6) reacts completely with excess oxygen (O2)?
1.69× 10²⁴molecules of carbon dioxide will be produced when 36.60 g of benzene reacts completely with excess oxygen .
What is moles?Mole, often known as mol, is a commonly used unit of measurement in chemistry for vast amounts of tiny objects including molecules, atoms, or other specific particles. In addition, the General Conference for Weights and Measures defines a mole as a unit of both the International Units System.
2C[tex]_6[/tex]H[tex]_6[/tex] + 15O[tex]_2[/tex] [tex]\rightarrow[/tex] 12CO[tex]_2[/tex] + 6H[tex]_2[/tex]O
moles of benzene = 36.60 g/78.11
=0.468 moles
the mole ratio between benzene and carbon dioxide is 2: 12
moles of carbon dioxide =6×0.468 moles
=2.80 moles
number of molecules of carbon dioxide =2.80 moles ×6.022×10²³molecules
=1.69× 10²⁴molecules
Therefore, 1.69× 10²⁴molecules of carbon dioxide will be produced when 36.60 g of benzene reacts completely with excess oxygen .
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Which of the following chemical equation represents a decomposition reaction? answer choices. H2SO3 → H2O + SO2. 2K + 2H2O → 2KOH + H2
The first equation, H2SO3 → H2O + SO2 is an equation that represents a decomposition reaction whereas the second equation, 2K + 2H2O → 2KOH + H2 is a single displacement reaction.
A decomposition reaction is defined as a chemical reaction wherein one reactant among the reactants, breaks down into two or more products.
The general format/formula of a decomposition reaction is:
AB -> A + B
where, AB is the parent molecule i.e. the reactant and A & B are the product molecules of the equation.
A decomposition reaction can be both endothermic (heat absorbing) or exothermic (heat releasing) in nature. However, the latter is more common in nature than the former.
One of the major applications of decomposition reaction is in the extraction of metals from their respective ores. For example, zinc(Zn) can be obtained/extracted from calamine (ZnCO3) by subjecting it to a decomposition reaction. In a manner similar to this, sodium can be obtained from it's ore sodium chloride (NaCl).
Some common existing examples of a decomposition reaction are provided below:
The decomposition of carbonic acid (H2CO3) in soft drinks, which can be equated as H2CO3 → H2O + CO2The reaction in the electrolysis of water to yield hydrogen and oxygen.Learn more about decomposition reaction here:
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Pleaseee help now ASAP please
Diphosphorus trichloride has a phosphorus content of 22.554%. Phosphorus is indeed a mineral that can be found in many foods naturally as well as in supplements. It has a number of functions in the body. It is a crucial component of cell membranes, bones, and teeth.
What occurs if you have a high phosphorus level?Frequently, high phosphorus does not result in any symptoms. On the other hand, an excess of phosphorous in your blood can result in calcium loss from your bones and other body tissues, resulting in low calcium levels (also called hypocalcemia). Low calcium levels do result in symptoms like: tense muscles
Does phosphorous hurt people?Severe vomiting & diarrhea, both of which are characterized as "burning," "luminescent," and with a garlic-like odor, are frequently brought on by ingestion of basic white or yellow phosphorus. Dysrhythmias, comas, hypotension, and even death are potential additional symptoms of severe poisoning.
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the maximum buffering effect of a weak acid occurs at.....?
When the ratio of weak acid and its salt in a buffer is equal to 1, it is said that the buffering capacity is maximum.
A buffer is made up of either a weak acid and its salt or a weak base and its salt.
The amount of acid or base that can be added to a given volume of a buffer solution before the pH changes significantly, usually by one unit, is referred to as the buffering capacity. Buffer capacity is determined by the amounts of weak acid and conjugate base present in a buffer mixture.
When NaOH is added to solutions containing varying concentrations of an acetic acid/sodium acetate buffer, the observed change in buffer pH is inversely proportional to the buffer concentration. If the buffer capacity is increased by tenfold, the buffer solution can absorb ten times the amount of strong acid or base previously.
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explain why the composition of an element is fixed
A fixed composition exists when an element contains only one type of atom.
What is fixed composition?A chemical substance's composition is fixed. "All samples of a compound have the same composition; i.e., all samples have the same proportion, by mass, of the elements present in the compound," Proust concluded.Pure Substance Matter with a defined composition and properties. Every pure substance is either an element or a compound. Elements All atoms are the same type, and elements only have one type of atom. For example, oxygen (O2), gold (Au), silicon (Si), and diamond (C).A pure substance is one that has a consistent chemical composition throughout, such as water, air, or nitrogen. A pure substance does not have to be composed of only one element or compound.To learn more about fixed composition refer to :
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How many moles are in 95 grams of MgCO3
1.1 moles
Explanation:Stoichiometry allows us to convert units such as grams to moles.
Molar Mass
Before we can convert grams to moles, we need to understand molar mass. Molar mass is the number of grams per mole. For example, the molar mass of oxygen is 16 g/mol. This means that there are 16 grams in one mole. Inversely, there is one mole in 16 grams of oxygen. Molar mass is a constant for each element that can be found on a periodic table.
Now, for this conversion, we need to find the molar mass of MgCO₃. To do this, we need to find the molar mass of each element within the compound.
Mg = 24.3C = 12O = 16Now, multiply each molar mass by its subscript; then add the molar masses together.
24.3 + 12 + 3(16) = 84.3 gramsThe molar mass of MgCO₃ is 84.3 grams.
Converting to Moles
Now we need to use stoichiometry to convert grams to moles. So, we are going to divide the grams by the molar mass.
[tex]95g*\frac{1mol}{84.3g} =1.127 mol[/tex]So, there are approximately 1.127 moles in 95 grams. However, due to significant figures, we round this to 1.1 moles.
Amazon ell a 12 pack of Sprite for $5. 79. Each can hold 12 fluid ounce. How much are you paying per gallon?
The price per gallon is $5.16.
How much are you paying per gallon?To determine the price per gallon, we first need to convert the number of fluid ounces in each can to gallons.Therefore, to convert fluid ounces to gallons, we divide the number of fluid ounces by 128.A 12 pack of Sprite cans holds 12 fluid ounces x 12 = 144 fluid ounces.In gallons it will be equal to 144 fluid ounces / 128 fluid ounces/gallon = 1.125 gallons.To determine the price per gallon, we divide the total price of the 12 pack by the number of gallons.$5.79 / 1.125 gallons = $5.16/gallon.So the price per gallon is $5.16.
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Oxides of active metals, such as CaO, react with water to produce...A) Metal CarbonatesB) Metal HydridesC) Metal HydroxidesD) Acids
The correct answer is Metal Hydroxides
What are metal hydroxides?
Metal hydroxides are metal hydroxides.They are often strong foundations. They consist of hydroxide anions and metal cations. Some metal hydroxides, such as alkali metal hydroxides, completely ionize when dissolved. Some metal hydroxides are weak electrolytes and only partially dissolve in aqueous solution.They are often strong foundations. They consist of hydroxide anions and metal cations. Some metal hydroxides, such as alkali metal hydroxides, completely ionize when dissolved. Some metal hydroxides are weak electrolytes and only partially dissolve in aqueous solution.To know more about metal hydroxides, click the link given below:
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c) Calculate the frequency of light required to remove the valence electron(s).
The frequency of light required to remove the valence electron(s) from an atom is known as the ionization energy. The ionization energy is dependent on the atomic structure and is specific to each element.
What is calculation of frequency of light?This energy can be calculated using the equation: E = hf = hc/λ, where E is the ionization energy, h is Planck's constant, f is the frequency of the light, c is the speed of light, and λ is the wavelength of the light.E = hf = hc/λwhere E is the ionization energy, h is Planck's constant, f is the frequency of the light, c is the speed of light, and λ is the wavelength of the light.To calculate the frequency of light required to remove the valence electron(s) from an atom, the ionization energy of the atom must be known, and then the equation can be rearranged to solve for frequency:f = E/h = hc/λEIt is important to note that the ionization energy for each element is unique and can be found in periodic table or in the reference book.To learn more about frequency of electron refer:
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How do I balance this?
Answer: 4NH3 + 5O2 —-> 4NO + 6H2O
Explanation: You balance it by making sure each have the same amount on each side.
There is 4 nitrogen on each side.
There is 12 hydrogen on each side (4*3) and (6*2).
There is 10 oxygen on each side (5*2) and (4+6)
how much heat must be removed to freeze a tray of ice cubes if the water has a mass of 40.0 q? heat offusion=334 j/g; q = mHf
The heat that is removed is obtained as 13.36 kJ.
What is the heat that is to be removed?We have to note that the heat that is to be removed can be obtained from the heat of fusion of the substance. We have to note that the heat of fusion has to do with the heat that is absorbed or evolved when the substance is changed from solid to liquid.
We know that;
q = mL
q = Heat that is absorbed or evolved
m = mass of the object in grams
L = Heat of fusion.
Then we have;
q = 40 g * 334 J/g
q = 13.36 kJ
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An atom of the ame element X ha an atomic number 8 and ma number 16,17,18. What i reponible for the difference in their ma number
The atomic weight of oxygen would be 16 if every known oxygen atom had 8 protons and 8 neutrons.
However, we are aware that some types of oxygen contain fewer than 8 neutrons in their nucleus, which accounts for the slightly below-16 atomic weight of some kinds of oxygen.
As a result, oxygen atoms have eight protons. Oxygen atoms typically have 8 neutrons as well. Oxygen atoms with 8 neutrons would have a mass of roughly 16 amu since their mass number is 16 (8 p+ + 8 n0).
Isotopes are atoms with the same number of protons but differing numbers of neutrons. Various atoms of an element may have different masses because the amount of neutrons for a particular element might change.
As an illustration, certain helium atoms have three neutrons as opposed to two.
Take the atomic number (Z) of 8 for oxygen. As a result, oxygen atoms have eight protons. Oxygen atoms typically have 8 neutrons as well. Oxygen atoms with 8 neutrons would have a mass of roughly 16 amu since their mass number is 16 (8 p+ + 8 n0).
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I’m doing a science project about does brands affect the way kids see clothing i need help finding my independent and dependent variable
express the answer in scientific notation
(7.296 x 10^2) Divided by (3.6 x 10^-9)
7.296 x 102 in scientific notation 23x1011 is obtained by dividing by 3.6 x 109.
What do the symbols used in science mean?Very big or very low numbers can be written using scientific notation. Once a number within 1 and 10 has been multiplied by such a power of 10, it is then expressed in scientific notation. For instance, the scientific notation for 650,000,000 is 6.5 108.
What does notation serve as?A system of symbols and signs is used in notation to represent words, numbers, sentences, etc. The efficient communication of words, figures, and other objects is greatly aided by notation, which is frequently created for a specific purpose. Music notation is a prime example of notation.
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Which one of the following is the largest mass?
A) 7.6 x 10^4 mg
B) 7.6 × 10^7 ng
C) 7.6 x 10^-² kg
D) 7.6 × 10^8 μg
Answer: its d
Explanation:
sorry if you get it wrong
An ad claims that a supplement helps a person lose weight, helps curb appetite to snack less, raises levels of serotonin to make a person feel less hungry, blocks new fat from forming, and increases metabolism to have more energy and burn existing fat. The manufacturer of the supplement published the data from the study of the product.
The study of the supplement used 100 subjects between the ages of 20 and 65. Of the 100 participants, 50 were male and 50 were female. Once the participants were selected for the study, each had the visceral fat measured. After all 100 participants were measured, it was determined that each had a measurement of more than 90 centimeters.
The testing subjects were divided into two groups. One group of 50 received the supplement and one group of 50 received a placebo. The study lasted for 16 weeks, but after 12 weeks, both groups were given the placebo.
After 16 weeks, men in both groups had a slight decrease in body weight. At the end of the study, the group receiving the supplement had reduced visceral fat when compared to the placebo.
After reading this data summary, what do you think? Answer the following questions in a post. Each question is worth 2 points.
1.Based on the testing data of the supplement, were any of the product's claims, proven correct? If so, identify the claims.
2.What data led you to that conclusion?
3.Which of the product's claims, if any, were not proven to be correct?
4.What type of testing data would you need to see in support of those claims to believe they were true?
5.When you see a product advertised on social media, how can you determine whether it is making reliable claims?
Answer:
If FDA finds that the evidence supporting the proposed claim is credible and the claim can be qualified to prevent it from misleading consumers,
fda.gov
Explanation:
How energy saving is done in cloud computing?.
Cloud computing is an efficient way to save energy, by utilizing virtualized resources and reducing or eliminating the need for physical hardware.
By utilizing virtualized resources, companies can reduce the amount of energy needed to power physical hardware such as servers. This also reduces the need for cooling systems, as the machines are running in a virtual environment.
Additionally, cloud computing allows for more efficient resource allocation, meaning that more users can be supported with fewer resources, which in turn reduces the energy used.
Finally, cloud computing also enables automated operations, which can reduce the human energy used to manage complex IT tasks.
By implementing these energy-saving measures, cloud computing can help businesses save on energy costs and help reduce their environmental impact.
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classify each statement based on whether it describes prokaryotes only, eukaryotes only, or can describe both prokaryotes and eukaryotes.Prokaryotes Eukaryotes Both Answer Bank unicellular contain mitochondria are generally less than 2 pm multicellularlack membrane-bound organelles
The following is the solution to the given question:
What are prokaryotes?
An organism lacks a distinct nucleus and other organelles due to the lack of an internal membrane. Bacteria are one of the best-known prokaryotes.
What are Eukaryotes?
Eukaryotes refer to unicellular or multicellular organisms whose cells contain distinct membrane-bound nuclei. Examples: plants and animals, fungi, and protists.
Prokaryotes: are generally less than 2um, lack membrane-bound organelles
Eukaryotes: multicellular, contain mitochondria
Both: Unicellular
Prokaryotes are single-celled organisms, but there are also single-celled eukaryotes such as yeast, and protists.
Eukaryotes have membrane-bound organelles like mitochondria, whereas prokaryotes lack membrane-bound organelles and prokaryotic cells are smaller than eukaryotic cells.
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How do you find the moles of H2O?.
To determine mole of Water or H₂O, you can do as follow:
Determine the atom of Water. As we know that is two hydrogen atoms and one oxygen atom.Each mole of the water molecule has 0.2 g. this calculated by adding the masses of a number of atoms elaborate in the formation of the water molecule Mass of water = ( 2 × 1 . 008 ) + 16 = 2032Determine total mr of water from periodic table and we will found the value is 18 g/molDetermine the mole by the formula: n = mass :total Mr. then we will find out that n = ( 2032)x : 18 where x is total water molecule.What are molecules?Molecule is a chemistry essence that contain two or more atom combines. The characteristic of molecule could be acid, base or neutral. Water is a molecule that has pH in neutral or pH = 7.
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Select all intermolecular forces that contribute to creating a solution of CH2Cl2 In H20. a. London Dispersion b. lon-dipole c. Dipole-dipole d. H-bonding
Intermolecular forces that contribute to creating a solution of CH2Cl2 in H2O are London Dispersion forces, Dipole-dipole interactions, and Hydrogen bonding.
London Dispersion forces occur between all molecules and result from the fluctuating distribution of electrons in the molecules, leading to a temporary dipole moment.
Dipole-dipole forces are attractive interactions between the positively charged end of one molecule and the negatively charged end of another molecule.
Hydrogen bonding occurs between molecules with hydrogen atoms covalently bonded to highly electronegative elements such as nitrogen, oxygen, or fluorine. In the case of CH2Cl2 in H2O, hydrogen bonding could occur between the polar H2O molecules and the chlorine atoms of the CH2Cl2 molecule.
Therefore, Intermolecular forces that contribute to creating a solution of CH2Cl2 in H2O are London Dispersion forces, Dipole-dipole interactions, and Hydrogen bonding.
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Solve C2H4 + O2 = CO2 + H2O using the algebraic method.
C2H4 + O2 → CO2 + H2O ⇒ C2H4 + 2.5O2 → 2CO2 + H2O
How does balancing of chemical rection?The algebraic method of balancing a chemical equation involves writing the reactants and products of the reaction as symbols and assigning each side of the equation a numerical coefficient to balance the equation. The coefficients must be rational numbers, and all coefficients must be multiplied by the same number to conserve the number of atoms of each element on both sides of the equation.For example, if a reaction is written as A + B → C, then the coefficients of A and B are multiplied by the same constant until the number of atoms of each element on both sides of the equation is equal. If the coefficients of A and B are 2 and 3 respectively, then they must both be multiplied by 3 to balance the equation, so the balanced equation would be 6A + 9B → C.
In this question
Step 1: Balance the equation.
C2H4 + O2 → CO2 + H2O
2C2H4 + 5O2 → 4CO2 + 2H2O
Step 2: Isolate the variable.
Divide both sides of the equation by 2.
C2H4 + 2.5O2 → 2CO2 + H2O
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In the diagrams above, explain what type of competition is in each and support your answer.
Answer:
1st one is competition (when two organisms fight for limited resources)
2nd one is predation (pursuit, catching food)
Explanation:
hope this helps
Answer the following question by entering the numeric value with appropriate units. when entering units, capitalization is important. for example, m is the symbol for meter and m is the symbol for molarity. if the length of one side of a square is 12.0 m , what is the perimeter of the square?Express the perimeter with the appropriate units.
The perimeter of the square is 48 meter if the length of the side is 12 meter.
A square can be defined as a two-dimensional closed shape with 4 equal sides and 4 vertices. The opposite sides of the square are parallel to each other. Square is also a rectangle with equal length and breadth. The perimeter of the square is a two-dimensional shape. The perimeter the length of one side must be multiplied by 4 as squares have 4 sides. so, 12 is multiplied by 4 and the result will be 48 meters. so, the parameter of the square will be 48 meters. A square is a quadrilateral with four equal sides. There are so many objects that are in the shape of a square. The square shape is identified by its equal sides and the interior angles are equal to 90°.
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What is kinetic energy class 11?.
Kinetic energy is the energy an object possesses due to its motion.
It is the energy an object has because of its movement, regardless of the direction it is moving in. The kinetic energy of an object increases as the square of its velocity, so as the velocity increases, the kinetic energy increases rapidly. It can be calculated by using the formula KE = 1/2 * m * v^2, where KE is the kinetic energy, m is the mass of the object and v is the velocity of the object. Kinetic energy is a scalar quantity, meaning it does not have a direction, and it is measured in joules (J). It is an important concept in physics and it can be found in many everyday applications, such as in sports, transportation, and machinery. Kinetic energy is also a form of mechanical energy and it is related to other forms of energy such as potential energy and thermal energy.
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what is the difference between organic and inorganic chemistry ?
The primary difference between organic chemistry and inorganic chemistry is that organic compounds mandatorily have a carbon atom, while most of the inorganic compounds do not contain a carbon atom.
Inorganic chemistry is mostly concerned with the properties and behavior of the inorganic compounds, which include minerals, metals and organometallic compounds.
Inorganic chemists are employed in fields ranging from mining to microchip making. The works are based on understanding the following:
The behavior and analogues for the said inorganic elements, and How these materials can be separated, modified and used.On the other hand, Organic chemistry is the study of the properties, structure, composition, preparation and reactions of carbon-containing compounds. Most organic compounds contain carbon and hydrogen together, but they may also include any number of other elements too (e.g., nitrogen, oxygen, halogens, phosphorus, silicon, sulfur).
Organic chemists spend most of their time developing noval/new compounds and finding better sustainable ways of synthesizing existing ones.
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If 165 J of energy raises the temperature of 20 g of an unknown metal from 30 to 50 degrees Celsius, what is the metal's specific heat?
0.103
0.413
66,000
4,950,000
AT=(Tr-T))
c = Specific Heat
AE= Heat Energy / Heat Gain or Loss
AE=mcAT
0.4125 joules per gram per degree Celsius is the metal's specific heat.
What does specific heat mean?
The amount of heat needed to increase the temperature of one gram of a substance by one degree Celsius is known as specific heat. Typically, the units of specific heat are calories or joules per gram per Celsius degree. As an illustration, the specific heat of water is 1 calorie (4.186 joules) per gram per degree Celsius.
The heat that a system releases or absorbs per unit mass during an irreversible isobaric-isothermal phase shift is known as latent heat.
c = Specific Heat
AE= Heat Energy / Heat Gain or Loss
AE=mcAT
165 = 20 *c * (50-30)
c = 165/ (20*20)
c = 0.4125
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What is the kinetic energy of a body of 2 kg moving with a velocity of 2 m s?.
The kinetic energy of the body is 4J
The body's kinetic energy is made up of
The energy of motion, or kinetic energy, can be seen in the movement of an item or subatomic particle. Kinetic energy is present in every moving object and particle. Kinetic energy is present when something moves, such as a person walking, a baseball soaring through the air, a piece of food dropping from a table, or a charged particle in an electric field.
According to the information provided, the body has a mass of 2 kg and a velocity of 2 m/s.
Kinetic energy is [tex]\frac{1}{2} mv^2[/tex]
where m is the mass of the body and v is velocity of the body.
k.E = [tex]\frac{1}{2} 2(2)^2[/tex]
K.E = 4 J
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