Answers
Answer:
What is the formula for calculating pi? The pi is a ratio and is obtained from a circle. If the diameter and the circumference of a circle are known, the value of pi will be as π = Circumference/ Diameter.
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The value of pi is 2.96 cm.
What is the circumference of a circle?The circumference of a circle is the distance round the circle. It is the perimeter of the circle. The diameter of a circle is a straight line that touches two points on the circumference of a circle and also passes through the center.
The circumference of a circle = πD
Where:
π = pi D = diameter = 1.38π = Circumference / diameter
4.08 / 1.38 = 2.96 cm
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Related Questions
HELP ASAP!!! Plzzz
How many total atoms of oxygen are present in the molecules represented here?
Answers
A(n) __________ occurs when the moon enters the umbral shadow of the earth without being entirely immersed in it.
partial lunar eclipse
total lunar eclipse
annular eclipse
Answers
Answer:
Partial lunar eclipse.
Explanation:
A lunar eclipse is a cosmological event by which, in the presence of the Earth between the Sun and the Moon, the latter does not receive the light of the Sun in the totality of its visible face, with which a part (or the totality ) of her is in the dark.
Thus, if the lunar eclipse implies an absence of sunlight in the entire lunar surface, the eclipse will be total, while if the eclipse implies an absence of light only in part, the eclipse will be partial (which is the most common event).
As of 2017, the tallest roller coaster in the world is the Kingda Ka, located at Six Flags Great Adventure in Jackson, New Jersey. It stands 139 meters tall and, at one point, the cars drop 127 meters! Roller coasters are a great way to investigate energy. Look at the diagram of a roller coaster below, and answer the following questions. At what point on the track does the car have the greatest potential energy?
Answers
Answer:
energy due to its velocity. We can compare potential and kinetic energy by considering a car on a hill. When the car is at the top of the hill it has the most potential energy.
Two pistons are in an enclosed volume with fluid in between them, such that movement in one piston affects the location of the other piston, as shown in the image below if. An explosion occurs in the piston on the left such that it moves 1 m, what is the distance that the piston on the right will move ( assuming that friction can be neglected)? ( Recall that work on an object is equal to the force on the object times the distance is it moved, and that work is conserved
Answers
First, we have to set up the necessary equation for work:
\(W=\int_{V1}^{V2}PdV\)As we can approximate the integral to:
\(W=\text{ P*\lparen V}_2-V_1)\)Where V is the volume and P is the pressure.
So, we can calculate these variables:
We have a number 1 state, which is the initial for both pistons (let's call the left piston A and the right one B), and we have the change in the volume that can be shown in the next equation
\(\Delta V_=\text{ A*}\Delta\text{S}\)Where A is the transversal area and S is the position. We have the change in the position, so we can calculate the change in the volume:
\(\Delta V_A=0.25m^2*\text{ 1m = 0.25m}^3\)Now, we can make these equivalence as the exercise tells that work in conserved:
\(\begin{gathered} W=P*\Delta V_A=P*\Delta V_B \\ \\ \end{gathered}\)And, if we assume that the process is isobaric (the pressure is the same in both), we can calculate the change in the volume as follows:
\(\Delta V_B=\Delta V_A=0.25m^3\)And now, we can calculate the change in the position through the same equation that we used before:
\(\begin{gathered} \Delta V=A*\Delta S \\ \\ \Delta S=\frac{\Delta V}{A}=\frac{0.25\text{ m}^3}{0.5\text{ m}^2}=0.5m \end{gathered}\)So, the answer is that the right piston moves 0.5m
Six students used the ruler in model to measure the length of a metal strip. Their measurements are show at the right. Were all of the students able to agree on a single value for any digit If yes which value and digit did they agree on
Answers
From the measurements by the students, two of the measurements: 3 cm and 3.00 cm agreed.
What are measurements?Measurements refers to values which describe a characteristic of a given object.
Measurement are of two types;
Qualitative measurements which describes the physical features of a given object. Example of such measurements include texture, color, etc.Quantitative measurements which give numerical values to certain properties of substances.Considering, the measurements by the students:
The measurement by the first student, Susan is 3 cmThe measurement by the second student, Maya is 2 cmThe measurement by the third student, Jonah is 2.5 cmThe measurement by the fourth student, Mark is 3.33 cm The measurement by the fifth student, Emily is 3 ¼ cmThe measurement by the sixth student, Dionne is 3.00 cmTherefore, only two of the measurements agreed.
In conclusion, measurements are used to describe observations about a given quantity.
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Note that the complete question is given below:
Six students used the ruler in model to measure the length of a metal strip. Their measurements are show at the right.
Susan 3 cm
Maya 2 cm
Jonah 2.5 cm
Mark 3.33 cm
Emily 3 ¼ cm
Dionne 3.00 cm
Were all of the students able to agree on a single value for any digit If yes which value and digit did they agree on
In Chemistry we look at the composition and the_
change Y
of matter
Answers
Explanation:
A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds
A toy balloon blown upto 10° C has a
volume 900 cc. At this stage the balloon
is distended to 7/8 of its manimum stretch
ing capacity. Will the balloon burst it
it is brought to a room having temperature
25°c. If not calculate the temperature
at which balloon burst?
Answers
Answer:
this is an example
Explanation:
Yes, the balloon will burst at room temperature.
As we know that, 480 x 7/8 = 420 is the maximum Stretching capacity of the balloon.
b) V. / T. = V/T
Where
V = 480 ml and T. = 5 C(278 K)
And T= 30 C( 303 K)
V = V.T/T.
V = 480 x 303/278
V = 523.1 ml
b)V./V=T./T ?
Where
V = 480 ml and
T = 5 C (278 K)?
And V = 420 ml
T=T.V./V
=278 x 480/420
= 317.17 k
Therefore the balloon will burst at the temperature of 317.17 k
Also learn more
The temperature of 0.5 kg of water is 303 K. It is cooled to 278 K by keeping it in a refrigerator. what is the time taken by water to reach 278 K if 87.5 J of heat is given out in each second? ( specific heat capacity of water is 4200 J/kg K )
The total volume required to reach the endpoint of a titration required more than the 50 mL total volume of the buret. An initial volume of 49.17±0.04 mL was delivered, the buret was refilled, and an additional 1.56±0.04 mL was delivered before the endpoint was reached. The titration of a blank solution without the analyte required 0.60±0.04 mL . Calculate the endpoint volume corrected for the blank and its absolute uncertainty. Note: Significant figures are graded for this problem. To avoid rounding errors, do not round your answers until the very end of your calculations. volume: mL ± mL
Answers
Answer:
The answer is "\(\bold{50.42 \pm 0.08}\)".
Explanation:
Overall delivered volume \(= [(49.06 \pm 0.05) + (1.77 \pm 0.05)]\ mL\)
Its blank solution without any of the required analysis \(= (0.41 \pm 0.04)\ mL\)
Compute the volume of the endpoint as follows:
Formula:
\(\text{End point volume = Total Volume delivered - volume required}\)
\(= (49.06 \pm 0.05) + (1.77 \pm 0.05) - (0.41 \pm 0.04) \\\\= (49.06 + 1.77 - 0.41) \pm \ \ (absolute \ \ uncertainty)\)
therefore,
absolute uncertainty \(=\sqrt{(0.05)^2 + (0.05)^2 + (0.04)^2}\)
\(=\sqrt{0.0025 +0.0025 +0.0016} \\ \\=\sqrt{0.0066}\\\\=0.08124\\\)
The Endpoint volume \(= (49.06+1.77-0.41)\pm (0.08124)\)
\(= 50.42 \pm 0.08\)
Therefore, the volume of the endpoint adjusted for the blank is:
\(\bold { = 50.42 \pm 0.08}\)
Which of the following technique is used to purify the impurities that are not very different in chemical properties of element? [a] Gas chromatography [b] Column chromatography [c] TLC [d] HPLC
Answers
Answer:
Explanation: Liquid Chromatography
I'm sorry if i'm wrong
Which types of particles are charged and located within the nucleus of an atom?
a. protons and electrons
b. neutrons
c. electrons
d. protons
Answers
Whoever gets it right gets brainliest!!
Answers
When different atoms join together, they are called a compound. Compounds are made of molecules (so molecules could be an alternate answer, but not all molecules are compounds)
Answer:
it is compound
Explanation:
Two or more elements combined into one substance through a chemical reaction, such as water, form a chemical compound. All compounds are substances, but not all substances are compounds.
Scientific method practice hypothesis construction & experimental design
Answers
what mass of glucose c6h12o6 would be required to prepare 5000 mL of a 0.215 M solution
Answers
Approximately 194.0 grams of glucose (C6H12O6) would be required to prepare a 5000 mL solution with a concentration of 0.215 M.
To determine the mass of glucose (C6H12O6) required to prepare a 0.215 M solution in 5000 mL, we need to use the formula:
Molarity (M) = moles of solute / volume of solution (in liters)
First, let's convert the volume of the solution from milliliters (mL) to liters (L):
5000 mL = 5000/1000 = 5 L
Now, we can rearrange the formula to solve for moles of solute:
moles of solute = Molarity (M) x volume of solution (L)
moles of solute = 0.215 M x 5 Lmoles of solute = 1.075 mol
Since glucose (C6H12O6) has a molar mass of approximately 180.16 g/mol, we can calculate the mass of glucose using the equation:
mass of solute = moles of solute x molar mass of solute
mass of glucose = 1.075 mol x 180.16 g/mol
mass of glucose = 194.0 g (rounded to three significant figures)
Therefore, approximately 194.0 grams of glucose (C6H12O6) would be required to prepare a 5000 mL solution with a concentration of 0.215 M. It's important to note that the molar mass of glucose used in this calculation may vary slightly depending on the level of precision required.
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SSA PRACTICE QUESTION
Mandy wanted to see if a new
environmentally-friendly pesticide will
prevent insect damage to tomato plants.
After making a hypothesis, she conducts
her experiment. She treats five tomato
plants with traditional pesticide and five
with the new pesticide. Mandy also
leaves five plants untreated as a control.
She makes careful notes of how she set
up her experiment and then records her
data about all of the plants. Why is it
important for Mandy to record her
procedures and data accurately?
Answers
Answer:
The correct answer is - so that other scientists can replicate the experiment and make sure the results are correct or to check accuracy.
Explanation:
The data and procudres are required to be recorded or noted correctly so the experiment and research can be replicate and tested for the accuracy of the experiment by other scientist and researcher.
Mandy also need to note procedure, data, variables and other data correctly for the testing the accuracy and replication of the experiment. The replication is essential to check if every thing is correct and result are error free.
What solid element is black, is an electrical conductor, is brittle and is found in group 4 of the periodic table?
Answers
Answer: silicon Si, Germanium GE
Explanation:
a student know the 2.5 moles of iron. he also knows avagaRDO NUMBER? WHAT MUSTE HE DO TO THESE TWO MUMBERS TO FIND NUMBER OF IRON ATOMS IN THE SAMPLE? A. MULTIPLY THEM, B. ADD THEM, C. DIVIDE THEM D. SUBTRACT THEM
Answers
He must do to these two numbers to find number of iron atoms in the sample by multiplying them.
Using Avogadro's number, what is the number of molecules?Avogadro's number can be multiplied or divided to convert between molecules and moles: Adding 6.02 x 10²³ o the number of moles will convert it to molecules. Divide the number of molecules by 6.02 x 10²³ to get the equivalent number of moles.
One of the basic constants in chemistry is the Avogadro's number. When the same number of atoms or molecules are being compared, it allows comparison of the various atoms or molecules of the given substances.
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'Which of the following best describes cis-trans isomers? See Concept 4.2 (Page 60)View Available Hint(s)They differ in the arrangement of covalent bonds and in covalent partners.They are long chains of hydrogen and carbon atoms.They are mirror images of each other.They have the same number of atoms of the same elements but different structures.They differ in their spatial arrangement around inflexible double bonds
Answers
The best description of cis-trans isomers is that they differ in their spatial arrangement around inflexible double bonds. Option E is correct.
Specifically, cis-trans isomers are a type of stereoisomers that have the same molecular formula and the same covalent bonds but differ in the spatial arrangement of their atoms due to the inflexibility of a double bond. In cis isomers, the two substituents on each carbon atom are on the same side of the double bond, while in trans isomers, the two substituents on each carbon atom are on opposite sides of the double bond.
This results in different physical and chemical properties for the two isomers. For example, cis and trans isomers of some compounds may have different boiling points, melting points, and reactivities. Cis-trans isomerism is an important concept in organic chemistry as it affects the properties and behavior of molecules and can have significant implications for their biological activity, environmental fate, and industrial applications. Option E is correct.
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Why is the same type of nail used in all test tubes? in every experiment done to show how rusting works and in what conditions.
Answers
in test tube 1 iron nail gets both air and moisture which is required for rusting. ... in the test tube 3 iron nail is not rusted because of the calcium chloride which is moisture absorber. hence nail would not get moisture for the rusting.
We should exhaust all possiblr resources from nature says a miner?
Answers
Answer: No
Explanation: Some scientists have declared that mineral deposits containing important non renewable resources such as copper and zinc will be exhausted in a few decades if consumption does not decrease.
Is the mold on bread made up of cells
Answers
Answer:
Yes.
Explanation:
Mold is a living organism. All living organisms are made up of cells.
What would a possible length for the missing
side length?
16
8
Answers
Answer:
24
Explanation:
the total of any 2 sides must be larger than the 3rd side. x is the 3rd side.
8 + x > 16
x > 8
16 + x > 8
x > -8
8 + 16 > x
24>x
x < 24
the second inequality tells us nothing as sides must be positive.
the third side must be between 8 and 24
An element that is likely to combine with other elements to form new substances is said to be ______.
A. buoyant
B. chemically reactive
C. metallic
D. solid at room temperature
Answers
Answer:
B. Chemically reactive
Explanation:
A Chemically reactive element is an element that is likely to combine with another element to form new substances
The reactivity of the element depends on the number of electrons in the outermost energy level and even the distance of the outermost energy level from the nucleus. From the periodic table, Fluorine is the most reactive non-metal while francium is the most chemically reactive metal
Which of the following is NOT an advantage of a wireless network? convenience reliability security speed
Answers
Answer:
Security
Explanation:
A wireless network consists of good connection with fast speed, convenience, and reliability. Security is a major problem with wireless connection as someone can get your information by joining the same connection as you.
Which of the following is a balanced chemical equation?
Select one:
NaOH + H2CO3 → Na2CO3 + H2O
N2 + H2 → 2NH3
NH3 + HCl → NH4Cl
AlCl3 + Li → Al + LiCl
Answers
Answer:
NH3 + HCl → NH4Cl: this equation is balanced as it has one nitrogen atom, four hydrogen atoms and one chlorine atom at each side of the equation.
Explanation:
Hello there!
In this case, according to the law of conservation of mass, we need to have the same number of atoms of each element at both sides of the equation; therefore we analyze each reaction:
NaOH + H2CO3 → Na2CO3 + H2O : three hydrogens at the left and two at the right, so this is not balanced.
N2 + H2 → 2NH3: two hydrogens at the left and six at the right, so this is not balanced.
NH3 + HCl → NH4Cl: this equation is balanced as it has one nitrogen atom, four hydrogen atoms and one chlorine atom at each side of the equation.
AlCl3 + Li → Al + LiCl: three chlorines at the left and one of the right, so this is not balanced.
Best regards!
hello, can you help me identify the name of these 4 molecules as well as the structural formula and the skeletal formula? thank you
Answers
Answer:1. metyletevinyl
4. (Z)-3-hydroxypropenal
Explanation:
yo please help. There is an image PLEASE... HELP... MEEEEE
Answers
Answer:
9. B different sounds the dog is exposed to
10. control, dependent, control, control, independent
Explanation:
which is correct when aluminium atom(al) loses three electrons. group of answer choices A. al3- B. al0 C. al3 D. al
Answers
The correct configuration when aluminium atom loses three electrons is Al3.
Aluminum has an atomic number of 13. There are 3 valence electrons in it. It will achieve the noble gas configuration of neon, which has an atomic number of 10, after losing 3 valence electrons.
In order to generate Al3+, aluminum, which contains 3 electrons in its valence shell, loses those 3 electrons.
The element Al (aluminum) belongs to group 13 and has an atomic number of 13. Al loses three electrons—two 3s and one 3p—from its valence shell as it forms the cation Al3+. Hence, to create the Al3+ cation, one electron from 3p and two electrons from 3s are lost.
Aluminium is a light, silvery-white metal. It is bendable and soft.
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If 6.81 mol of an ideal gas has a pressure of 2.99 atm and a volume of 94.35 L, what is the temperature of the sample?
Answers
Answer:
504.57 K.
Explanation:
From the question given above, the following data were obtained:
Number of mole (n) = 6.81 moles
Pressure (P) = 2.99 atm
Volume (V) = 94.35 L
Gas constant (R) = 0.0821 atm.L/Kmol
Temperature (T) =.?
Using the ideal gas equation, the temperature of the ideal gas can be obtained as follow:
PV = nRT
2.99 × 94.35 = 6.81 × 0.0821 × T
282.1065 = 0.559101 × T
Divide both side by 0.559101
T = 282.1065 / 0.559101
T = 504.57 K.
Thus, the temperature of the ideal gas is 504.57 K.
Calculate the mass of one mole of
(a) calcium atoms.
(b) oxygen molecules.
Anyone can help me ? Thanks
Answers
Answer:
(a) Molar mass of ca= 40g/mol
(b) O2= 16 * 2 = 32g/mol
Consider a buffer solution consisting of 0.35 M HNO2 and 0.50 M KNO2, which has an initial pH of 3.30 (Ka for HNO2 = 7.1 x 10-4). If 0.030 mol of HCl are added to 1.0 L of this solution, select all the options that correctly reflect the steps required to calculate the change in pH.
Answers
A water solvent-based solution with a pH change of 3.24 is made up of a combination of a weak acid and the conjugate base of the weak acid
The simple buffer solution is what?A simple buffer is a solution that combines a strong acid with a weak base in relatively high concentrations. These buffers are alkaline because their pH is higher than 7 at 298 K. Consider NH4OH and NH4Cl.
the operation of a buffer solution:Buffer solutions maintain a constant pH by neutralizing extra acids or bases. These compounds consist of a weak acid and its conjugate base, which exchange protons and hydroxide ions to produce water.
pH = -log(7.1×10−4×0.380.47)7.1×10-4×0.380.47 = 3.24
[H3O+] = 7.1 x 10-4 x 0.380.47
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