Which of the following equations best describes the energy at point
C, assuming energy is conserved?
O A. PEA= KEC
o B. PEA= KEc + PEC
C. PEg= KEC + PEC
O D. PEg = PEC
Answers
Answer:
The correct option is
B. PEA = KEC + PEC
Explanation:
The potential energy is the energy possessed due to position
From the image the point with the highest position and therefore the most potential energy and the lowest or zero kinetic energy is point A
Given that we have;
Total mechanical energy = The potential energy + The kinetic energy
Where there is constant total mechanical energy in the system, then, at the point A where the kinetic energy is zero, the potential energy is equal to the total mechanical of the system, we have;
Total mechanical energy = The potential energy at A = PEA
Total mechanical energy = PEA
At point C where we have the total mechanical energy presented as follows;
Total mechanical energy = Kinetic energy at C + Potential energy at C
Total mechanical energy = KEC + PEC
Therefore;
PEA = KEC + PEC.
Related Questions
22. Write a balanced equation for each of the following reactions.
b) Magnesium metal with steam.
Answers
Answer:
2Mg(s) + O2(g) - >2MgO(s)
A plasma that has particles that never collide frequently enough to exchange kinetic energy and never reach a temperature equal to the surroundings is categorized as a thermal plasma. ionized plasma. low density plasma. nonthermal plasma.
Answers
Answer:
For comprehension, the question is written properly with options attached below:
plasma that has particles that never collide frequently enough to exchange kinetic energy and never reach a temperature equal to the surroundings is categorized as:
A. a thermal plasma.
B. ionized plasma.
C. low density plasma
D. nonthermal plasma.
The correct answer to the question above is "Option D (nonthermal plasma.)"
Explanation:
Plasma, for example radiant sun are state of matter made up of atoms where the ions move freely, there are composed of photons and free electrons but the positive and negative ions are equal creating a swirling gas of positive ions and negative electron and they are also good conductors of electricity as their charged particles move.
Unlike thermal plasmas that ensure their temperature is equal to their surroundings, non-thermal plasma, is not in equilibrium with its surrounding., in other words, non-thermal plasma never reaches temperature that is equal to their surroundings. They can be formed by electrifying electromagnetic waves.
A plasma with particles that never collide frequently to exchange kinetic energy is : ( D ) Nonthermal plasma
A plasma is a body of matter made up photons and freely moving ions contained its atoms the free moving ions are both positive and negative ions which are equal to each other.
A Thermal plasma collide frequently enough to reach a temperature that is equal to the temperature of the surroundings while Nonthermal plasma does not collide enough and does not reach an equilibrium temperature with its surrounding.
Hence we can conclude that A plasma with particles that never collide to exchange kinetic energy is A Nonthermal plasma.
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carbon + oxygen= carbon dioxide ( give me answe)
Answers
Answer:
C+O2=CO2
Explanation:
During combustion the reaction is formed.
When ionic solids dissolve in water, they produce soluble aqueous cations and anions. For example, adding MgBr2 solids to water will produce ions according to the dissolution reaction below.MgBr2(s) ? Mg2+(aq) + 2 Br?(aq)
solid cation anionIn this lab, you will be mixing two solutions containing soluble ions and observing any reactions that occur. Please write the dissolution reaction for the ionic solid Al(NO3)3.(Use the lowest possible coefficients. Include states-of-matter under the given conditions in your answer. Explain each step.)
Answers
Answer:
Al(NO3)3(s)--------> Al^3+(aq) + 3NO3^-(aq)
Explanation:
The equation shown above describes the dissolution of Al(NO3)3 in water using the lowest coefficients.
This occurs when solid Al(NO3)3 is added to water. It dissolves to give rise to ions as shown. This is a property of all ionic substances.
4. Express the answers to the following problems in scientific notation. Hint: Use the subtraction example to solve the addition problem. A. (1.8 X 1020) X (2.5 X 10^16) C. (9.2 X 10^19) ÷ (3.0 X 10^7) B.(7.9 X 10^9) - (6.0 X 10^8) D. (4.2 X 10^9) + (8.0 X 10^18)
Answers
Answer:
see below
Explanation:
A. (1.8 X 10^20) X (2.5 X 10^16)
= 4.5 x 10³⁶
B.(7.9 X 10^9) - (6.0 X 10^8)
= 7.3 x 10⁹
C. (9.2 X 10^19) ÷ (3.0 X 10^7)
= 3.067 x 10¹²
D. (4.2 X 10^9) + (8.0 X 10^18)
= 8.00000002042 x 10¹⁸
Answer:
see below
Explanation:
A. (1.8 X 10^20) X (2.5 X 10^16) = 4.5 x 10^36
B.(7.9 X 10^9) - (6.0 X 10^8) = 7.3 x 10^9
C. (9.2 X 10^19) ÷ (3.0 X 10^7) = 3.067 x 10^12
D. (4.2 X 10^9) + (8.0 X 10^18) = 8.0 x 10^18
The density of aluminum is 2.70 g/cm3. What is the mass of 235 cm3 of aluminum?
634.5 g
635 g
635 g/cm3
634.5 ml
Answers
Answer:
JUST B
Explanation:
Which of the following means a natural occurring solid that has a specific chemical makeup?
A. Rock
B. Mineral
C. Erosion
Answers
Answer:
mineral
Explanation:
Because every natural thing has mineral
Why doesn’t the temperature of an object constantly rise as you add more and more kinetic energy?
Answers
how did Bohr change Rutherford's model
Answers
Explanation:
To solve that deadlock problem, in 1913 Bo kept Rizopho's model of planetary atom and combined with Plang quantum theory, he produced a hydrogen atom model with the following three determinations: - In atoms, The clectron cannot orbit any other, but only rotates with a certain number of orbits. Each "allowed" orbit is equivalent to a certain energy. - When rotating in "allowed" orbits, electrons do not lose energy, meaning they do not emit radiation, but emit radiation only when the electron jumps from an orbit with the high energy level in the orbit corresponding to the the low energy and the household energy of radiation are equal to the difference of the two energy levels. - - When rotating in those "allowed" orbits, the electron has a momentum moment that is an integer times of h / (2π).
Write in standard notation 6.078 x 10 expo 3
Answers
Answer:
6078
Explanation:
I bake some flour until it turns into leavened bread. Is this a physical or chemical change? Why do you think this?
Answers
Given the reaction for the nickel-cadmium battery: 2NiOOH + Cd +2H2O -> 2Ni(OH)2 + Cd(OH)2 What species is oxidized during the discharge of the battery?
Answers
Answer:
Cd is oxidized during the discharge of the battery
Explanation:
Based on the reaction:
2 NiOOH + Cd + 2H₂O → 2Ni(OH)₂ + Cd(OH)₂
And knowing Oxygen and hydrogen never change its charge, we must to find oxidation state of Ni and Cd before and after the reaction:
Ni:
In NiOOH: 2 O = -2*2 = -4 + 1H = +1, = -4 + 1 = -3. And as the molecule is neutral, Ni is 3+
In Ni(OH)₂: OH = -1. As there are 2 OH = -2. That means Ni is +2
The Ni is gaining one electron, that means is been reduced
Cd:
Cd before reaction is as pure solid with oxidation state = 0
Cd after the reaction is as Cd(OH)₂: 2 OH = -2. That means Cd is +2
The Cd is loosing 2 electrons, that means is the species that is oxidized.
In DNA replication, what is the leading strand? A. the strand that is unzipped at the replication fork B. the strand that assembles new nucleotides in a continuous fashion C. the strand that does not assemble new nucleotides in a continuous fashion D. the strand that waits for the DNA replication process to be finished
Answers
Answer:
B
Explanation:
Answer: B.) the strand that assembles new nucleotides in a continuous fashion
Explanation: edgenuity
What are the favourable condition
the formation of ionic bond?
for
Answers
Answer: Favourable conditions for the formation of ionic bond are low ionization energy of metal and high electronegativity of non-metal.
Explanation: An ionic bond is defined as the bond formed due to transfer of one or more number of electrons from one atom to another.
Answer: Favourable conditions for the formation of ionic bond are low ionization energy of metal and high electronegativity of non-metal. Explanation: An ionic bond is defined as the bond formed due to transfer of one or more number of electrons from one atom to another
hope this helps, sorry if im off
Behold a mixture of oily/hydrophobic (yellow) and water (purplish) molecules. recall that hydrophobic regions are ones with few or no partial charges--so there's nothing for water's hydrogen interaction donors or acceptors to 'play with'. so! how many of the water molecules are 'stuck' contacting at least part of a hydrophobic molecule in this arrangement?
Answers
Answer:
about 40
Explanation:
In the attached diagram, there are 5 hydrophobic molecules show, each of which has 9 water molecules shown around it. There are "about 40" water molecules 'stuck' to the hydrophobic molecules.
How many significant figures are in 463?
Answers
Sig Figs
3
Decimals
0
Scientific Notation
4.63 × 102
Is 500mL greater than 5L
Answers
If the density of a set of keys is 8 g/cm', what is the volume if its mass is 54 g?
a.432 mL
b. 6.75 mL
c. 432 g
d. 0.148 mL
Answers
Answer:
the volume of a set of keys is 6.75ml
The work of which scientist was most essential to the use of the scientific
method and quantitative measurements in chemistry?
Answers
Answer:
Antoine Laurent Lavoisier
How to prevent environmental hazards?
Answers
Answer:
by throwing away or recycle
Explanation:
A human zygote has 46 chromosomes. This number of chromosomes represents what in a human cell?
Answers
Which statement accurately compares the trends in atomic number and atomic mass in the periodic table
Answers
Answer: is C
Explanation:
Both the atomic mass and the atomic number increase from left to right
Answer:
The answer is number 3
Explanation:
A gold-colored ring has a mass of 17.5 grams and a volume of 0.82 mL. What is the density of this ring?
Answers
Answer:
21 g/mL
Explanation:
To solve this problem, first look at the density equation, which is D=M/V, which D stands for density, M stands for mass, and V stands for volume. When you substitute in the variables, you get D=17.5/.82, which is equivalent to 21.34. However, since we need to pay attention to the sig fig rules for multiplying, we need to have the same amount of sig figs as the value with the least amount of sig figs, which is the number .82. .82 has two sig figs, so you round down. Your answer will be 21 g/mL.
Which of the following is not likely to appear on a map?
A. Remote sensors
B. compass rose
C. contour lines
D. latitude lines
E. the equator
Answers
A. Remote Sensors
Hey student made a model of a river in a sandbox a pile of sand represents soil and bits of rocks in the riverbed water pouring from 100% river water as it flows downhill which two characteristics are limitations of the students model
Answers
Answer:
The model is missing plants, fish and other details found in a real river
The model is much smaller then a real river
Explanation:
Answer:
The model is missing plants, fish and other details found in a real river
The model is much smaller then a real river
Explanation:
Does corrosion occur when iron nail is in salt water
Answers
Answer:
Yes
Explanation:
: The corrosion of iron indicates a chemical change in the metal. ... Where salt is present, electrochemical corrosion occurs, and the protective oxide film does not form, thus the corrosion (buildup of rust) continues unchecked. Your iron nail will indeed rust more quickly and severely in salt water.
Maggie loves fresh brownies, and her grandma told her if she places a piece of bread in the storage container with the brownies, the brownies will stay fresh and moist longer. Maggie decides to test this idea. She bakes a batch of Betty Crocker brownies. She places 6 brownies in 6 individual tupperware containers. Each brownie is the same size and placed in the same location. She adds a piece of bread to three of the brownie containers, and leaves the other three alone. Each day for three weeks she measures the moistness of the brownies and records her results. What is the independent variable? What is the dependant variable? What are the constants? Hypothesis? What are the control groups? What is the experimental group?
Answers
Answer:
Independent variable - Piece of bread
Dependant variable - Moistness of brownie
Constants- Same size and location of brownie
Hypothesis - IF a piece of bread is added to a brownie container, THEN the brownie will be moister
Control groups- The set of brownie containers she adds no piece of bread to
Experimental group- The set of brownie containers she adds a piece of bread to
Explanation:
The hypothesis in an experiment is a testable explanation to a given problem, which is whether a piece of bread can make brownie moist in this question. Hence, a possible hypothesis will be: IF a piece of bread is added to a brownie container, THEN the brownie will be moister
Independent variable is the variable that the experimenter changes or manipulates in the experiment. In this case, the independent variable is the PIECE OF BREAD added to the brownie.
The dependent variable is the variable that is being measured in an experiment. The dependent variable in this case is the MOISTNESS of the brownie
Constants are variables that the experimenter keeps unchanged for all the groups throughout the experiment. In this case, the constants are SAME SIZE AND LOCATION OF BROWNIE.
Control group is the group that does not receive the experimental treatment or independent variable while the experimental group is the group that receives the experimental treatment. The control group in this experiment is: The set of brownie containers she adds no piece of bread to, while the experimental group is the: The set of brownie containers she adds a piece of bread to
Iron has a density of 5.5 g/mL. What would be the volume of a 1500 g sample?
Answers
Answer:
volume = 272.7 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{Density} [/tex]
From the question
mass of Iron = 1500 g
Density = 5.5 g/mL
Substitute the values into the above formula and solve
That's
[tex]volume = \frac{1500}{5.5} \\ = 272.727272...[/tex]
We have the final answer as
volume = 272.7 mLHope this helps you
What is the formal charge of i in icl4
Answers
Answer:
Explanation:
in the Lewis structure of ICl4- there are total of 36 valence electrons. Since Iodine (I) is below Period 3 on the periodic table it can hold more than 8 electrons. ... Also note that you should put the ICl4- Lewis structure in brackets with as 1- on the outside to show that it is an ion with a negative one charge.
The formal charge present on the iodine atom of ICl₄ is -1.
How do we calculate formal charge?Formal charge on any atom present in any compound will be calculated by using the below formula:
Formal Charge = (No. of valence electrons in neutral atom) - 1/2 (No. of electrons in covalent bond) - (No. of electrons in lone pair)
In the structure of ICl₄, 4 covalent bonds are present and for iodine atom no. of valence electrons in iodine is 7 and lone pair present on iodine is 2 means 4 electrons of lone pair is present. Structure is shown in the attached image.
On putting these values we get,
Formal charge = 7 - 1/2(8) - 4 = -1
Hence in iodine atom -1 charge is present.
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What are 2 examples of what happens when scientist do not have a standard system of measurement of the scientific community?
Answers
Answer:
Explanation:
The standard system of measurement is what is popularly referred to as SI unit (or international system of units). For example, the SI unit for length is basically in meters (m), which is convertible to millimeter (mm), centimeter (cm) or even kilometer (km).
If there is no standard system of measurement,
1) Scientists will not be able to compare data as every scientist will use a unit that suits him/herself which might make data incomparable as some units might be difficult to convert to other units or there conversion methods might even be debatable.
2) There might be a general lack of understanding of the research work done by a scientist/scientists in the scientific community. This is because the standard system of measurement affords scientists to communicate properly with the same or convertible units and based on 1. above, if scientists use any unit that isn't agreed upon, different/unknown/debatable units might make understanding of research works incomprehensible.