Which of the following equations best describes the energy at point C.
assuming energy is conserved?
OA. PEA = KEC
O B. PEA = KEc+PEC
OC. PER = KEc+ PEC
OD. PEB = PEC
Answers
Answer:
B. PEA = KEC. +PEC
Explanation:
From the figure it is clear that there is interconversion between potential energy ( PE ) and kinetic energy ( KE ) , so that total mechanical energy is conserved .
At A only potential energy exists . Kinetic energy is zero .
At B only kinetic energy exists . Potential energy is zero .
At C both potential and kinetic energy exist .
So Potential energy at A is equal to potential energy at C and kinetic energy at C
Ie , PEA = KEC + PEC .
Option B is correct .
Related Questions
Which of the following MOST directly influences a measurable outcome in an experiment? a. An independent variable b. A variable hypothesis c. A dependent variable d. Previous information
Answers
Answer:
A). An independent variable
Explanation:
The Independent variable is characterized itself as the variable that is controlled or manipulated by the experimenter to observe its direct impact on the dependent variable. It is a variable that is not dependent and can stand alone. For example, if a student aims to observe the impact of temperature on solubility of a substance(sugar/salt) in a liquid, the temperature will be the independent variable as any change in the temperature will directly affect the solubility power of the liquid. Thus, option A is the correct answer.
Answer:
D.
Explanation:
Can someone help me with this please....
Answers
a. vinegar
b. Mineral deficiencies in the body can make joint pain worse. Because Vinegar contains the calcium, magnesium, potassium, and phosphorus your body needs, it helps as a supplement and therefore reduces pain.
1. in making fertilisers which are chemical compounds or salts to increase fertility of soil.
2. lithium hydroxide is used in space because of its high absorption of carbon dioxide and the small amount of heat produce by the reaction.
3. Acid rain has a lower pH than "normal" rain . Rain is naturally somewhat acidic with a pH between 5.0-5.5 typically. Acid rain has a pH that is below this: 4.4-4.2
4. lemon juice is an anti bacterial and a good germicidal solution which helps in removing the unseen bacteria on our hands.
Hope this helps :)A cake recipe calls for 0.75 cups of milk, but all you have is a tool that measures out one tablespoon. How many tablespoons of milk needs to be put in the cake batter? Hint: 16 tablespoons = 1 cup
Answers
Answer:
12 tablespoons
Explanation:
because 3/4 of 16 tablespoons is 12 tablespoons
16x 0.75 =12
A mineral is described as "metallic." This description refers to its:
Answers
Answer: properties
Explanation:
The element which has the properties
Mallablity
Ductility
Lusterous
High electric. Conductivity
High tensile strength is said to be metal.
Which actions would increase the rate at which salt dissolves in water? Stir the water. Crush the salt. Use less water. Heat the water. Cool the salt.
Answers
Answer:
Crushing or grinding increases the surface area of the salt that is exposed to the molecules of water. Stirring increases the speed at which the particles of salt come in contact with the water molecules.
Select the correct answer. An iron nail is made up of particles. What is true about the particles? A. They move all over the place. B. The force of attraction between them is small. C. The spacing between them is large. D. They stay in place and vibrate.
Answers
Answer:
Option B is correct.
Explanation:
Since an iron nail is solid and have very large force of attraction between the particles therefore the particles can't move freely and could only vibrate at it's place.
Answer:
Option B is correct.
Explanation:
Since an iron nail is solid and have very large force of attraction between the particles therefore the particles can't move freely and could only vibrate at it's place.
This is the responding variable, or the variable you don't control.
a. Independent
b. Dependent
Answers
Answer:
The dependnet varaible(B)
Explanation:
The dependent variable changes as the independnet variable changes. In an experiment you change the independnet varaible and you observe the resulting changes in the dependent variable.
Write a simple procedure for measuring out 2.6 grams of sodium bicarbonate NaHCO3 or commonly known as baking soda?
PLEASE I REALLY NEED THIS!!! :/
Answers
Answer:
See explanation
Explanation:
If I intend to measure 2.6 g of sodium bicarbonate, I need a spatula, a filter paper, and a weighing balance.
The filter paper is placed on the balance and the balance is adjusted to read zero. The spatula is now used to collect the sodium bicarbonate solid from its container and gradually drop it on the filter paper while watching the mass read out by the balance. This continues until the balance reads 2.6g.
How do starch and ATP store and supply energy?
Answers
Answer:
Explanation:
ATP is used for immediate energy and short-term storage, while starch molecules are stable and can be stored for a long time
ATP is used for immediate energy and long-term storage, while starch molecules are unstable and can be stored for a short amount of time.
c soluble bases are bases are called
Answers
Answer:A soluble base is called an alkali if it contains and releases OH− ions quantitatively. However, it is important to realize that basicity is not the same as alkalinity. Metal oxides, hydroxides, and especially alkoxides are basic, and conjugate bases of weak acids are weak bases.
Bob walks 81m East and then he walks 103m East.
Answers
Answer:
81m + 103 m
= 184 m to the east
Which of these steps would most likely be part of a lab procedure?
Write a hypothesis to answer a question.
Write a title at the top of a completed lab report.
Record the time to complete a chemical reaction.
Create a question on the cause of a chemical reaction.
Answers
Answer:
the answer is C
Explanation:
Record the time to complete a chemical reaction
The step that will be part of a lab procedure is; "Record the time to complete a chemical reaction."
A lab procedure refers to something that is done in the laboratory as part of an experiment.
If we look at the options carefully, we will notice that the only thing that is part of a laboratory experiment is "Record the time to complete a chemical reaction."
This action can be carried out in a live lab procedure.
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Question
Drag each label to the correct location in the table
Match each career to the correct career pathway.
Science and Mathematics
Engineering and Technology
anthropologist
fuel ce technician
Civil drafter
computer programmer
meteorologs
electrice
Submit
Answers
Answer: Science and Mathematics- Anthropologist, Meteorologist
Engineering and technology- Fuel Cell Technician, Computer programmer, electrical Drafter, Civil Drafter
Answer:
i have the same question
Explanation:math and science is the meteorologs and the anthropologist
what is the definition of anion
Answers
Answer:
Negatively charged ion.
Explanation:
Example:
Oxygen is an element containing negatively charged ions. Its valence number is minus 2.
Hope this helps ;) ❤❤❤
Question 5(Multiple Choice Worth 3 points)
(01.04 LC)
Complete this sentence. The electrical conductivity of a sample will
when the size of the sample increases.
O decrease
O stay the same
O increase
O be unable to be determined
Answers
Answer: B. Stay the same
how many electrons does the predictable (most common) ion of flourine contain
Answers
Answer:
8
Explanation:
This is because fluorine has the 9 electrons but because it's an ion it gives out an electron thereby losing an electron...so the electron number is 8
Answer:
8electron
Explanation:
Fluorine has 9electron on its orbit although it loses one weak electron to another strong element during ionization. example: Cl-F
basic atomic structure of argon
Answers
Answer:
structure of argon
Explanation:
The nucleus contains 18 protons ( red) and 22 neutrons (orange). 18 electrons (white) occupy shells ring.
A cylinder rod formed from silicon is 46.0 cm long it has a mass of 3.00 kg. The density of silicon is 2.33 g centimeters cubed. What is the diameter of the cylinder?
Answers
Answer:
Explanation:
First find the volume from the density.
d = mass/volume
mass = 3.00 kg = 3000 grams
density = 2.33 g/cm^3
volume = mass/ density
volume = 3000 / 2.33
volume = 1287.6 cm^3
============================
Next use the volume to find the radius.
V = pi * r^2 * h
V = 3.14 * r^2 * 46
1287.6 /46 = 27.99
27.99 / 3.14 = 8.91
r^2 = 8.91
r = 2.99
2r = d = 5.97
The half-life of radium-226 is 1590 years. if a sample contains 100 mg, how many mg will remain after 1000 years?
Answers
Answer:
[tex]a=64.7mg[/tex]
Explanation:
Hello,
In this case, we need to remember that for the required time for a radioactive nuclide as radium-226 to decrease to one half its initial amount we are talking about its half-life. Furthermore, the amount of remaining radioactive material as a function of the half-lives is computed as follows:
[tex]a=a_0(\frac{1}{2} )^{\frac{t}{t_{1/2}} }[/tex]
Therefore, for an initial amount of 100 mg with a half-life of 1590 years, after 1000 years, we have:
[tex]a=100mg(\frac{1}{2} )^{\frac{1000years}{1590years} }\\\\a=64.7mg[/tex]
Best regards.
What is the smallest division on this balance? 1g 0.1g 0.01g 0.001g
Answers
Correct Answer: 0.01g
The scales and balances have various divisions and units that define the accuracy of the measurement system. The smallest division on the balance scale is 0.001 gm. This, option D is correct.
What is scale?Scales have been defined as the measurement system that estimates the quantity of the various substances in various units including, centimeters, meters, kilograms, grams, milligrams, liter, milliliters, etc. These units are interconvertible.
1 gram is the while part of the gram unit, 0.1 shows one-tenth part of the gram, 0.01 shows the one-hundredth part of the gram, and 0.001 shows the thousandth part of the gram. one gram is the largest number on the scale and 0.001 gm is the smallest number on the balance.
Therefore, option D. 0.001 gm is the smallest number.
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In each pair of statements, choose the example that is more reliable.
Statement 1
The company Herbal Remedies Inc.
announced today that its antiobesity skin
treatment is safe and effective.
Statement 2
The US Food and Drug Administration (FDA)
announced today that cancer treatment X,
manufactured by Pharma Inc., is safe and
effective.
Statement 1
An independent chemical analysis paid for by
local residents determined that wells are
contaminated with dioxin at a concentration
of 3 ppb.
Statement 2
The chemical company Chemicals Inc. insists
that local groundwater has not been affected
adversely by a leak in its waste handling
system.
Answers
Answer:
"statement 2" for the first pair and "statement 1" for the second pair
Explanation:
What is the main hitch or problem in getting fusion to occur?
Answers
Answer:
working with intense pressure and heat
Explanation: you would you have to work with intense pressure and heat in order to fuse two hydrogen nuclei together to create helium isotopes.
Answer:
The main problem is achieving ignition to start the reactions. Fusion reactions can occur only at extremely high temperatures.
Explanation:
in which atom is the number of protons equal to the number of neutrons?
Answers
Answer:
neutral
Explanation:
What is the volume in milliliters, of a sample of helium that has a mass of 1.73 x 10^-3g given that the density is 0.178 47g/L
Answers
Given :
Mass of helium sample , [tex]m=1.73\times 10^{-3}\ g[/tex] .
Density of helium , [tex]\rho=0.178\times 10^{-3} \ g/cm^3[/tex] .
To Find :
The volume in millilitres .
Solution :
Density is given by , [tex]\rho=\dfrac{m}{V}[/tex]
So , volume is , [tex]V=\dfrac{m}{\rho}[/tex]
Putting given values in above equation we get :
[tex]V=\dfrac{1.73\times 10^{-3}}{0.178\times 10^{-3}}\ ml\\\\V=9.72\ ml[/tex]
Therefore , volume of sample of helium is 9.72 ml .
Hence , this is the required solution .
The volume of sample in milliliters is 9.72 mL .
Given data:
The mass of sample is, [tex]m=1.73 \times 10^{-3} \;\rm g[/tex].
The density of the helium sample is, [tex]\rho = 0.17847 \;\rm g/L =0.17847 \times 10^{-3} \;\rm g/cm^{3}[/tex].
The given problem is based on the concept of density. The density of any substance is equal to the mass per unit volume of the substance. The expression is given as,
[tex]\rho =\dfrac{m}{V}\\\\\\V =\dfrac{m}{\rho}\\\\\\V =\dfrac{1.73 \times 10^{-3}}{0.17847 \times 10^{-3}}\\\\V =9.72 \;\rm mL[/tex]
Thus, we can conclude that the volume of sample in milliliters is 9.72 mL .
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What is a scientific theory? (2 points)
a
A law that is always true
A hypothesis about nature
C с
An educated guelmes based on observations
d
An explanation of how the natural world works
Answers
Answer:A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. Such fact-supported theories are not "guesses" but reliable accounts of the real world.
Should be right
A scientific theory is defined to be the part and explanation of the natural world, its phenomena, and the detailed description of the working. Thus, option D is correct.
What is the relation between scientific theory and hypothesis?
A scientific theory is said to be the well-accepted and well-proposed explanation of the topic matter that has repeatedly undergone experiments to prove its ingenuity and uses well-constructed facts and hypotheses.
The hypothesis is the basis of the scientific theory as it gives the idea about the subject issue for which the experimental design is set for the analysis and reach a conclusion.
The scientific theory is proposed based on a hypothesis that assumes something based on limited evidence that is evaluated and undergoes experiments for it to be proved true or false.
Therefore, option D. a scientific theory is the explanation of the working of the natural world.
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What type of number is this. Water boils at sea level at 100.0 Celsius.
Answers
Answer:
100
Explanation:
answer is to simple why it is 100.0 when you write the number down on your calculator it give you 100 because the last zero does not count
why does spoiled food produce foul smell
Answers
Answer:
There is spoilage microbes growing on the food, such as bacteria, yeasts, and mold. The odor can either come from the chemicals that are released from the food as the microbes decompose it down, or the chemicals are produced by the microbes themselves.
Answer:
When food goes bad and starts to become pungent, it is most often due to the growth of spoilage microbes such as bacteria, yeasts and mold. Odors can come from two sources: chemicals that are released from the food as the microbes decompose it, or chemicals produced directly by the microbes themselves.
Hope this answer correct :)
Describe the relationship between wavelength, frequency, and energy in electromagnetic waves. Which waves are the most dangerous?
Answers
Answer:
Explanation:
relation between energy wavelength and frequency.....
we know that energy of photon is
E=hf but
v=fλ
f=v/λ when v=c(speed of light) then f=c/λ
putting the value of f in the equation of photon
E=hc/λ this equation gave a relation between wavelength frequency and energy in electromagnetic waves
among electromagnetic waves UV rays are most dangerous because exposure to these radiation cause serious problems in living organism
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The relation that we use in case of electromagnetic wave is E=hc/λ
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hc/λ
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave
Thus the relation that we use to find the energy of electromangetic wave is E=hc/λ
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how are sound waves different from the waves in the sea or the ripples on water???
Answers
Answer:
water wave shake energy over the surface to the sea, while sound waves thump energy trough the body of the air. sound waves are compression waves
Hope this helps :)
Mr. Krabs created a secret ingredient for a breath mint that he thinks will "cure" the bad breath people get from eating crabby patties at the Krusty Krab. He asked 100 customers with a history of bad breath to try his new breath mint. He had fifty customers (Group A) eat a breath mint after they finished eating a crabby patty. The other fifty (Group B) also received a breath mint after they finished the crabby patty, however, it was just a regular breath mint and did not have the secret ingredient. Both groups were told that they were getting the breath mint that would cure their bad breath. Two hours after eating the crabby patties, thirty customers in Group A and ten customers in Group B reported having better breath than they normally had after eating crabby patties. What is the independent variable?
Answers
Answer:
Type of breath mint
Explanation:
The independent variable, in this case, would be the type of breath mint given to each study group.
An independent variable refers to a variable whose variation does not depend on another variable or factor. In research, the independent variable stands alone and the researcher can control or manipulate it in order to measure its effect on some other variables.
In the case of Mr. Krabs, the two types of breath mints administered to the two study groups represent the independent variable. Any differences in the experience of the two study groups can be attributed to the difference in the breath mint taken.