Search: A sample of a radioactive substance decayed to 93.5% of its original amount after a year. (Round your answers to two decimal places.)

Number of results: 11,307

calculus
A sample of a radioactive substance decayed to 94.5% of its original amount after a year. (Round your answers to two decimal places.) (a) What is the half-life of the substance? (b) How long would it take the sample to decay to 65% of its original amount?
Friday, November 9, 2012 at 6:00pm by kela

Calc
A sample of a radioactive substance decayed to 93.5% of its original amount after a year. a) What is the half-life of the substance? ? years (b) How long would it take the sample to decay to 10% of its original amount? ? years
Sunday, November 8, 2009 at 7:47pm by Lee

MATH!
The mass of a radioactive substance follows an exponential decay model, with a decay rate of 5% per day. A sample of this radioactive substance was taken six days ago. If the sample has a mass of 3 kg today, find the initial mass of the sample. Round your answer to two decimal...
Thursday, March 15, 2012 at 8:53pm by Kim

Science
Radioactive substance decays so that after t years, the amount remaining, expressed as a percent of the original amount, is A(t)=100(1.6)^(-t). a) Determine the function A’, which represent the rate of decay of the substance. b) what is the half-life for this substance? c...
Tuesday, March 6, 2012 at 11:03pm by jessica

calculus
The rate at which an amount of a radioactive substance decays is modeled by the differential equation dA/dt = kA, where A is the mass in grams, t is the time in years, and k is a constant. Answer the following. a) If a 100-gram sample of the radioactive substance decays to 95 ...
Monday, March 19, 2012 at 12:43pm by ronnieday

science
A 10g sample of radioactive substances is lift to decay for five half-lives. How much of the radioactive substance remains?
Tuesday, February 19, 2013 at 3:51pm by mirian hernandez

precal
If the half-life of a certain radioactive substance is 2000 years, estimate how many years must elapse before only 35% of the radioactive substance remains?
Tuesday, January 22, 2013 at 10:15pm by james

calculus
Carbon-14 is a radioactive substance produced in the Earth's atmosphere and then absorbed by plants and animals on the surface of the earth. It has a half-life (the time it takes for half the amount of a sample to decay) of approximately 5730 years. Using this known piece ...
Friday, July 24, 2009 at 1:11pm by j

AP Chem
105. A radioactive metal atom decays (goes to another kind of atom) by emitting an alpha particle (He+2 ion). The alpha particles are collected as helium gas. A sample of helium with a volume of 12.05 mL was obtained at 765 mmHg and 23 Degrees C. How many atoms decayed during ...
Wednesday, November 12, 2008 at 9:20pm by DrBob222

Chemistry
How many half lives will it take for a sample of a radioactive isotope containing 20000 radioactive nuclei to decay to 2000 radioactive nuclei
Tuesday, November 16, 2010 at 7:41pm by Dianne

Science
If a 20 gram sample of a radioactive substance has a half-life of 6000 years, how many grams would be present after 18000 years?
Wednesday, December 5, 2012 at 4:21pm by Owen

Science
The number of radioactive atoms has decayed to 8/32 = 1/4 of the original value. That takes two half lives.
Wednesday, April 15, 2009 at 11:47pm by drwls

chem
after 30 days 50% of the sample would have decayed. 50% / 30 days gives you a daily decay rate of 1.6666667. multiply this by 16.2 to give 27. 27 is the percentage of the sample that has decayed after 16.2 days so 100-27 = 73%
Saturday, April 27, 2013 at 6:29pm by jimbo

math
if the rate for radioactive decay for a substance is r=-.0063 and time is being measured in days how do you find the half-life of the substance to the nearest hour?
Monday, March 30, 2009 at 1:16am by mike

Physical Science- Help Please!
Suppose that you are given a 100 gram sample of a radioactive substance with a half-life of 32 days. How many grams will be left after 192 days?
Wednesday, December 5, 2012 at 4:13pm by Molly

math30
The mass of a radioactive sample is represented in the graph below. The initial mass of 32 mg decays to 8 mg after 21 hours. 1)What is the half-life of the radioactive sample, in minutes? 2)Solve each equation. a. 4 8x-1 = 8 b. 3^(2x-5) = 1/27x
Tuesday, July 3, 2012 at 4:16am by alejandro

queen of peace academy
If 1g of sodium-24 has decayed from a sample that was orinally 2g. How old is the sample?
Thursday, March 28, 2013 at 1:43pm by michael

Calculus-Modeling Equations
An unknown radioactive element decays into non-radioactive substances. In 420 days the radioactivity of a sample decreases by 39 percent. 1.What is the half-life of the element? 2.How long will it take for a sample of 100 mg to decay to 46 mg?
Friday, March 6, 2009 at 12:08am by Kim

precalculus
Twenty percent of a radioactive substance decays in ten years. By what percent does the substance decay each year?
Thursday, March 3, 2011 at 5:40pm by katrina

Chemistry
A radioactive sample contains 3.25 1018 atoms of a nuclide that decays at a rate of 3.4 1013 disintegrations per 26 min. (a) What percentage of the nuclide will have decayed after 159 d? % (b) How many atoms of the nuclide will remain in the sample? atoms (c) What is the half-...
Friday, April 16, 2010 at 8:47pm by Trixie T

chm
An unknown radioactive substance has a half-life of 3.20 . If 34.8 of the substance is currently present, what mass was present 8.00 hours ago?
Friday, February 10, 2012 at 12:23am by cp

Pre Calculus
Exponential growth and decay find the half life of a radioactive substance if 220 grams of the substance decays to 200 grams in 4 years?
Tuesday, October 25, 2011 at 1:40am by Josh

chemistry
If you accidentally spill phosphorus-32 onto your shoe, how long would it take before 99.9 of the radioactive material has decayed so that you can safely wear the shoes again?
Thursday, May 12, 2011 at 5:23pm by brittany

ALGEBRA
Suppose that a certain radioactive substance has a half-life of 20 years. If there are presently 2400 milligrams of the substance, how much, to the nearest milligram, will remain after 70 years?
Wednesday, March 21, 2012 at 12:59pm by Anonymous

9th grade math
Here is a causal relatlionship. The amount of radioactive decayed products depends on the time since it was formed. Amount=OriginalAmount* e^(t/k) where k is a constant.
Thursday, March 5, 2009 at 8:20pm by bobpursley

Calculus-derivatives
Verify if these are correct answers. 1. The derivative of f(x)=e^2x -e^-2x is f'(x)=2e^2x - 2e^-2x? 2.A certain radioactive substance is decaying so that at time t, measured in years, the amount of the substance, in grams, given by the function f(x)=3e^-3t. What is the ...
Tuesday, March 6, 2012 at 7:09pm by Matthew

Chemistry
If a 100.0 gram sample of a radioactive isotope goes through three half-lives, how much of the original radioactive isotope will remain?
Thursday, January 24, 2013 at 9:17pm by OhSnap

math
An unknown radioactive element decays into non-radioactive substances. In 100 days the radioactivity of a sample decreases by 64 percent. a)(a) What is the half-life of the element? half-life: b)How long will it take for a sample of 100 mg to decay to 51 mg? time needed:
Saturday, May 18, 2013 at 4:06am by Rachel

chemistry
A particular radioactive substance has a half-life of 4 minutes. How long will it take for 250 g of this radioactive material to decay to less than 0.1g? 24 min 36 min 40 min 48 min 72 min I got 32 min but that not one of the choices. Please help
Monday, December 5, 2011 at 2:53pm by Anonymous

chemistry
sometimes,instead of percentage composition, you will have the composition of a mass sample. using the actual mass of the sample, determine the empirical formula for compounds that have the following analyses. b. a 13.07g sample of an unknown substance is composed of 9.48g of ...
Saturday, February 23, 2013 at 7:34pm by tula

Physics
Suppose a hypothetical radioactive nucleus (Hy) has a half-life of 10 days. If we have 80 gms of the substance at the start of an experiment, how many gms of the substance will remain undecayed after 30 days
Saturday, May 10, 2008 at 8:27pm by Tim

chemistry
what is the density of an 84.7g sample of an unknown substance if the sample occupies 49.6cm3? what volume would be occupied by 7.75g of this same substance? PLEASE help need the answer tonight i have a test tomorrow i kind of not understand the second question. THANK YOU SO ...
Wednesday, September 22, 2010 at 6:02pm by heather

chemistry
A radioactive sample contains 3.25 1018 atoms of a nuclide that decays at a rate of 3.4 1013 disintegrations per 26 min. (a) What percentage of the nuclide will have decayed after 159 d? % (b) How many atoms of the nuclide will remain in the sample? atoms (c) What is the half-...
Friday, April 16, 2010 at 5:04pm by Trixie

Math/Calculus
After 5 days, a particular radioactive substance decays to 37% of its original amount. Find the half life of this substance. Is this right? Th= ln 2/ln(1/.37) x 5 days
Monday, October 17, 2011 at 8:32pm by Christine

AP Chem
Help with these two please. 105. A radioactive metal atom decays (goes to another kind of atom) by emitting an alpha particle (He+2 ion). The alpha particles are collected as helium gas. A sample of helium with a volume of 12.05 mL was obtained at 765 mmHg and 23 Degrees C. ...
Wednesday, November 12, 2008 at 9:20pm by Anna

Physics
100-g sample of substance is heated to 100˚C and placed into calorimeter cup containing 150 g of water at 25˚C. The sample raises the temperature of water to 32.1. What is the specific heat of the substance?
Sunday, March 21, 2010 at 10:04pm by John

chemistry
The idea is to use an isotope of O or make O radioactive and use that to produce CO2 or H2O (that is make O different so you can find it). Then (if you made O radioactive) measure the glucose and the O2 and see if the O2 is radioactive or if the glucose is radioactive. Let'...
Monday, April 15, 2013 at 12:04am by DrBob222

Science
If the half-life of a radionuclide is 1 month, is a sample of it completely decayed after 2 months?
Friday, March 22, 2013 at 11:07pm by Dee

chemistry
Which of the following is true of a substance with a pH of 11.0? A. The substance is an acid. B. The substance is a base. C. The substance is neutral. D. The substance is a transition metal. I think A
Saturday, November 10, 2012 at 3:28pm by Keri

chemistry
a radioactive material is undergoing nuclear decay. After 40 minutes, 25% of the sample remains. What is the half-life of the sample
Saturday, August 27, 2011 at 9:00am by marjani

Chemistry
Assume that a reaction occurs in which unknown substances R and S react to form unknown substances T and U. From the information below, determine the mass of substance T that will be formed if 45.0 grams of substance R reacts with 23.0 grams of substance S. (Assume that the ...
Tuesday, May 20, 2008 at 8:07pm by Daniel

Chemistry please check
1. All of the naturally occurring radioactive decay series end when the radioactive elements have decayed to bismuth (Bi) hydrogen (H) lead (Pb) uranium (U) answer: Uranium (U) 2. This type of radiation can easily pass through a human. gamma ultra-violet beta alpha answer: ...
Friday, February 15, 2008 at 11:35pm by Mary

physics
WHY IS RADIOACTIVE WASTE STORED UNDERGROUND IS IT BECAUSE IT IS A HARMFULL SUBSTANCE
Thursday, April 10, 2008 at 1:21am by exam in 3 weeks

chemistry
why is radioactive waste stored underground is it because it is a harmful substance
Thursday, April 10, 2008 at 3:31am by exam in 3 weeks

chemistry
Substance A has a specific heat of .650J/gK and substance B has a specific heat of .325J/gK. If 100 J of energy is applied to a 10 g sample of each substance, which will have a higher temperature?
Monday, September 19, 2011 at 8:53pm by Anonymous

Chemistry
1. We identify substances from their physical and chemical properties. 2. If we know the density of a substance, we can calculate the mass of a sample from the volume or the volume from the mass. 3. The density of a substance is taken into account in determining how that ...
Wednesday, September 2, 2009 at 4:37pm by GK

chemistry
what is the density of a substance if a 2.50 ml sample has a mass of 0.880g at room temperature? what is the specific gravity of the substance?
Sunday, September 9, 2012 at 11:25pm by Sasha nelson

science
The half-life of carbon 14 is 5730 years. if a 1 g sample of old carbon is 1/8 as radioactive as 1 g of a current sample, then the age of the old sample is about ___________years. 22,900 17,200 11,500 716
Monday, March 5, 2012 at 3:49pm by chuck

Chemistry
6CO2 + 6H2O ==> C6H12O6 + 6O2 Make O in CO2 radioactive; see where the radioactive O is at the end. Make O in H2O radioactive; see where the radioactive O is at the end.
Sunday, April 14, 2013 at 11:52pm by DrBob222

Science
What fraction of the original activity of a radioactive substance will remain at the end of half-life?
Monday, July 16, 2012 at 4:50am by Nezz

Chemistry
Sometimes, instead of percentages compostion, you will have the composition of a sample by mass. Using the actual mass of the sample, determine the empirical formula for compounds that have the following analyses. A. a .858g sample of an unkown substance is composed of .537g ...
Saturday, January 24, 2009 at 7:00pm by Chopsticks

advanced functions HELP!!!
Radioactive decay is the process by which an unstable element transforms into different element, typically releasing energy as it does so. For 500g of a radioactive substance with a half-life of 5.2 hours, the amount remaining is given by the formula M(t)=500(0.5) ^ t/5.2 a) ...
Wednesday, December 10, 2008 at 8:55pm by james

physics/science
i dont understand why radioactive waste is stored underground is it because it is a harmful substance
Thursday, April 10, 2008 at 10:52am by exam in 3 weeks

Physcis 30
Q1) If there are 100 radioactive atoms with a half-life of 30 seconds, how many radioactive atoms will remain after one half-life (30 seconds)? How many will remain after two half-lives (60 seconds)? Three half-lives? So basically, after 30 seconds it will be 50.After 60 sec. ...
Thursday, January 6, 2011 at 11:13am by Marium

physics
The half life of a radioactive sample is 6.93 days.after how many days will only one -tenth of the sample be left behind?
Wednesday, August 1, 2012 at 2:37am by Mira

Chemistry
Suppose 1.0 mol of substance A reacts with 1.0 mol of substance B. to produce 2.0 mol of substance C. In a reaction, 2.4 mol of substance A is allowed to react with 2.1 mol of substance B. What amount in moles of substance c is produced?
Wednesday, April 1, 2009 at 10:22pm by Andrew

physics
Suppose 32000 radioactive nuclei are in a sample. About how many remain after two days if the half-life is 22 hrs? What is the initial activity of the sample in decays per minute?
Tuesday, May 5, 2009 at 10:06am by Anonymous

Pre Calculus
Exponential Growth and Decay Find the half-life of a radioactive substance that decays by 5% in 9 years.
Saturday, October 22, 2011 at 7:23pm by Josh

chemistry
Without even doing the math it the change in disintegrations is merely .03333, the sample must have decayed for d. less than a few years
Monday, April 25, 2011 at 2:33pm by drake

chemistry
Substance A and substance B react to form substance C as described by the equation: A + B ↔ C If only substance A and substance B are placed in an enclosed vessel and allowed to react what would the reaction be?
Monday, June 13, 2011 at 3:18pm by guilford technical college

Chemistry
Q1. The blood volume in a cancer patient was measured by injecting 5.0 mL of Na2SO4(aq) labeled with 35S (t1/2 = 87.4 d). The activity of the sample was 300 µCi. After 22 min, 12.9 mL of blood was withdrawn from the man and the activity of that sample was found to be 0....
Friday, April 16, 2010 at 6:35pm by Trixie

Algebra 2
A 14 gram sample of a substance that's used to preserve fruit and vegetables has a k-value of 0.1092. Find the substance's half-life, in days. Round your answer to the nearest tenth.
Tuesday, May 7, 2013 at 2:11pm by Tristan

Science
A material has 32 atoms in all; 24 decayed and the rest undecayed. If the half-life of the radioactive material is 1000 years, what is the age of the material? a. 1000 years b. 2000 years c. 3000 years d. 4000 years
Wednesday, April 15, 2009 at 11:47pm by Angie

Chemistry
The half-life of phosphorus-32 is 14.26 days. The decay constant is k=4.86×10−2/days. If you accidentally spill phosphorus-32 onto your shoe, how long would it take before 99.9% of the radioactive material has decayed so that you can safely wear the shoes again?
Sunday, May 1, 2011 at 2:08pm by Anonymous

Chemistry
How do you calculate the amount of a radioactive substance remaining after an integral number of half-lifes have passed?
Tuesday, April 6, 2010 at 12:27am by Tristan

math
You have just isolated a new radioactive element. If you can determine its half-life, you will win the Nobel Prize in physics. You purify a sample of 2 grams. One of your colleagues steals half of it, and eight days later you find that 0.1 gram of the radioactive material is ...
Sunday, October 21, 2012 at 2:34pm by Roseanne

11th grade
what is the density of an 84.7g sample of an unknown substance if the sample occupies 49.6cm3
Wednesday, September 9, 2009 at 8:43pm by Anonymous

chemisrty
When a substance changes from one phase to another, which of the following occurs? the substance loses or gains heat the average kenetic energy of the substance changes the temperature of a substance changes the molecular motion of a substance changes
Friday, November 16, 2012 at 11:14am by Tasia

Science Lab -Half-Life of Popcorn
When a radioactive sample decays, there is one less parent nuclei and one more daughter nuclei. As this decay process continues, the number parent nuclei decreases and the number of daughter nuclei increases. Eventually there are no parent nuclei increases. Eventually there ...
Friday, October 29, 2010 at 10:00pm by Anonymous

chemistry
The half-life for the radioactive decay of calcium-47 is 4.5 days.If a sample has an activity of 4.00uCi after 13.5 days, what was the initial activity of the sample?
Wednesday, September 26, 2012 at 2:30pm by Shay

Physics
This is related to the classic thought experiment "Schroedinger's cat". Your answer seems intuitively correct, but in quantum mechanics, until a decay measurement is actually made, the radioactive source exists in a mixed quantum state, with nonzero probability ...
Monday, March 31, 2008 at 4:04am by drwls

Math
Find the half-life (in hours) of a radioactive substance that is reduced by 10 percent in 5 hours.
Tuesday, August 28, 2012 at 6:58pm by David

chemistry
An unknown substance has a mass of 17.3 . When the substance absorbs 1.557×102 of heat, the temperature of the substance is raised from 25.0 to 45.0 . What is the most likely identity of the substance?
Monday, September 20, 2010 at 10:47pm by Kyle

Science (urgent)
Suppose 13.7kJ of heat are removed from 33.5g liquid sample of ethanol at 26.8^oC. When all this heatis removed from the substance, at what temperature and in what states will you find the substance?
Monday, May 4, 2009 at 11:29pm by Nick

chemistry
A certain substance has a molar heat of vaporization of 54.2 kJ/mol. How much of the substance is in a sample that requires 80.0 kJ to vaporize? Answer in units of mol
Thursday, March 1, 2012 at 6:32pm by anonymous

Half-Life
If the half-life of a radionuclide is 1 month, is a sample of it completely decayed after 2 months?
Sunday, February 19, 2012 at 5:08pm by Dee

Chemistry
A 50.6 mg sample of sodium perchlorate contains radioactive chlorine-36 (whose atomic mass is 36.0 amu). If 29.6% of the chlorine atoms in the sample are chlorine-36 and the remainder is naturally occurring nonradioactive chlorine atoms, how many disintegrations per second are...
Monday, February 13, 2012 at 4:33pm by Steven

math
The decay of 333 mg of a radioactive substance is given by A(t) = 333e-0.024t, where t is time in years. Find the amount left after 17 years.
Friday, April 8, 2011 at 7:17pm by allison

Calculus
A certain radioactive material decays exponetially. The percent, P, of the material left after t years is given by P(t)= 100(1.2)^-t a)Determine the half life of the substance
Tuesday, April 13, 2010 at 7:43pm by lala

Chemistry-pH
If you are given a colored substance as a sample, how would you measure the pH of a sample?
Tuesday, January 25, 2011 at 5:12am by Bam

Alg2
Radioactive iodine is used to determine the health of the thyroid gland. It decays according to the equation y=ae -0.0856t where t is in days. Find the half-life of this substance. Round to the tenths place.
Thursday, December 8, 2011 at 7:37pm by Rock

Chemistry
Caffeine C8H10N4O2, is a stimulant found in a tea and coffee. A sample of the substance was dissolved in 45.0g of choloroform CHCl3 to give a 0.0946m solution. How many grams of caffine were in the sample. m = molality
Wednesday, February 6, 2008 at 10:27pm by Lauren

science/math
write and solve an algebraic equation to find the original mass of the sample of the radioactive isotope uranium -235, which has a half-life of 704 million years your sample is about 700 million years old and weighs 120 grams
Tuesday, November 27, 2012 at 11:55pm by Justin

science
As redioactive material decays and the percentage of new material in the original sample increases, does the age of the sample substance increase, decrease, or remain the same?
Thursday, February 12, 2009 at 10:02pm by kerri

college physics
A 215 g sample of a substance is heated to 330 degrees C and then plunged into a 105 g aluminum calorimeter cup containing 165 g of water and a 17 g glass thermometer at 12.5 degrees C. The final temp is 35.0 degrees C. What is the specific heat of the substance?
Thursday, May 6, 2010 at 12:38am by E

chemistry
2. Imagine you have two beakers. Both beakers are filled with the same amount of water. The water in both beakers is the same temperature as well. You add 50 g of Substance A to the first beaker, and 50 g of Substance B to the second beaker. After stirring both beakers, there ...
Thursday, October 22, 2009 at 12:59pm by fatima

Chemistry
How much a 2.00 g 239 Pu would have decayed after 1.6 x 10^4 years? The half-life for 239 Pu is 2.4 x 10^4 years. amount remaining= originalamount*(.5)^(1.6/2.4) amount decayed = original - amountremaining
Sunday, November 26, 2006 at 9:09pm by James

Physics
If a sample of a radioactive isotope has a half-life of 5 year(s), how much of the original sample will be left at the end of the second year? How much will be left at the end of the third year of thr original sample? How much will be left at the end of the fourth year of the ...
Monday, November 23, 2009 at 7:19pm by TITA

calc
The half-life of polonium is 139 days, but your sample will not be useful to you after 95 % of the radioactive nuclei present on the day the sample arrives has disintegrated. For about how many days after the sample arrives will you be able to use the polonium? you want to ...
Tuesday, April 10, 2007 at 11:46pm by barb

physical science
A certain radioactive substance has a half-life of 1 hour. If you start with 1 gram of the material at noon, how much will be left at 3:00 P.M.? At 6:00 P.M.? At 10:00 P.M.?
Wednesday, November 2, 2011 at 10:08pm by cheryl

scince thanks
A chemical reaction is a change in which a substance reacts with a different substance usually to create a different substance or compound. A chemical change is a change in the chemical makeup of a substance usually ending with a different sunstance but the beginning substance...
Saturday, October 6, 2007 at 9:02pm by Michele

science
a scientist has two samples of a substance. both samples have the same temperature. one sample has a mass of 10 g. the other sample has a mass of 20 g. compare the average kinetic energy and total kinetic energy of the particles in each sample.
Monday, September 26, 2011 at 7:54pm by sha

physicalscience
(HELP ME)a secientist has two samples of a substance.both samples have the same temperature.one sample has a mass of 10g. the other sample has a mass of 20g. compare the average kinetic energy and total kinetic energy of the particles ineach sample.
Sunday, March 20, 2011 at 8:21pm by descha

AP BIO
a student wished to test a sample of organic material to determine whether it was sugar, a dat, or starch. If she could perform only one of the following, which would be the most revealing? 1- test for the presence of carbon and hydrogen in the sample 2- test the sample to ...
Wednesday, October 7, 2009 at 5:43pm by bubba

chemistry
a radioactive material is undergoin nuclear decay. After 40 minutes, 25% of the sample remains. What is the half life of the sample? Pls say the formula how to calculate it a)10 mins b) 20 mins c) 40 mins d)80 mins e) 160 mins
Monday, May 28, 2012 at 10:38am by star

physics-Radioactivity
1) The number of radioactive nuclei in a particular sample decreases over a period of 15 days to one-seventeenth the original number. What is the half-life (in days) of these nuclei? 2) What is the activity of a sample of 14C that contains 1.22E+21 nuclei?
Friday, April 18, 2008 at 9:16pm by Sandhya

Chemistry (Check)
Regarding 2&3: 2, always true. For a substance of known molar mass, the number of moles of a sample can (always) be calculated from the mass of the sample. The molar mass of O2 is 32.00 g. (This is the substance of known molar mass). Let's say you have a sample of 16 g...
Monday, February 5, 2007 at 3:01pm by Rosie

English
Select the answer that contains the correct punctuation for the following sentence. A diamond is the hardest natural substance it can scratch any other stone. A. The sentence is correct. B. ... substance, it can... C. ... substance; it can... D. ... substance; and, it can... I...
Wednesday, April 6, 2011 at 5:51pm by anthony

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