Friday
November 28, 2014

Posts by jason


Total # Posts: 1,120

physics
heyy thats right its in the physics book page 337 the answer is in the back of the book lol good job i need to learn how to do it lol :P
June 3, 2009

economics
What are the effects of the economic crisis on our society?
May 26, 2009

science assignment
what imapct has technology had on our society
May 25, 2009

MATH TRIG
FROM A DISTANCE OF 80 M. THE ANGLE OF ELEVATION OF THE TOP OF A FLAGPOLE IS 18 DEGREES. dETERMINE THE HEIGHT OF THE FLAGPOLE.(NEAREST TETH OF A M. mY CONFUSION IS ANGLE OF DEPRESSION AND ANGLE OF ELEVATION. mY TECHER CALLS FROM TOP ELEVATION WHILE i INSIST ELEVATION IS FROM ...
May 13, 2009

Chemistry
What is the molar solubility of PbCl2 in a solution of 0.23 M CaCl2? Ksp = 1.6 10-5 for PbCl2. idk how to do this because of the Cl2
May 11, 2009

Biology
Recent studies of children and juveniles of other species show that when their eyeballs are actively growing, frequent exposure to blurred images can permanently alter the shape of the eyeball. The blurring results when objects in the field of view are at various distances and...
May 7, 2009

Biology
Researchers in Africa found that a very high proportion of Masai, who routinely drink large quantities of milk, develop an amoebic infection after being given an iron supplement. Explain the role of lactoferrin in a diet and explain why the Masai get this problem and why Zulu ...
May 7, 2009

Biology
In 1999, Beverly Strassman published a study of menstrual cycling among the Dogon women in Mali. What did she find? Using her study results, what methods can you suggest reducing breast cancer in North American women who will have no children or very few children?
May 7, 2009

Biology
In the early 1900s, Julius Wagner-Jauregg noted that syphilis was rare in areas where malaria was common. Describe the experiment he did. What prize did he win in 1927 as a result of this experiment? Considering the ethical implications of his study, would he get the same ...
May 7, 2009

Biology
Haemophilia is a sex-linked recessive trait. A son born to phenotypically normal parents has Klinefelter syndrome and hemophilia. In which meiotic division of which parent is non-disjunction of the X chromosome most likely to have occurred? Explain with diagrams and state your...
May 7, 2009

Biology
In Drosophila, a cross was made between a female heterozygous for the recessive genes ct (cut wings) and se (sepia-coloured eyes) and a sepia male. Among their female progeny, half the phenotypes were wild-type and half sepia. Among their male progeny were 1/4 wild-type, 1/4 ...
May 7, 2009

Biology
At what time (be very specific) is the consumption of Thalidomide dangerous to pregnant women? What exactly goes wrong to produce phocomelia children?
May 7, 2009

Biology
In most Hymenoptera, all fertilized eggs develop into diploid females and all unfertilized eggs into haploid males-a condition known as haplodiploidy. Workers in these colonies share half the alleles they received from their mother, but share all of the alleles they received ...
May 7, 2009

Economics.
1 – One of the reasons that the U.S. Government started the Federal Reserve system was to: A – keep the banking power of the U.S. spread out among various districts. B – make sure that the U.S. banks were obeying laws regarding banking. C – have a place for...
May 6, 2009

Economics.
The buying and selling of government securities to alter the supply of money are: A. a painful necessity. B. Open market operations. C. equalizing the required reserve ration. D. tight money policies. I’m thinking its B.
May 6, 2009

geometry
how can you justify a shape
May 4, 2009

Pre Cal.
So I posted these...but no one answered them. Are they right? Solve 4sin^2 x + 4sqrt(2) cos x-6 = 0 for all real values of x. My answer: (pi/4)+2(pi)k, (7pi/4) + 2(pi)k Solve 2cos^2 x-5cosx+2=0 for principal values of x. My answer: 60 and 300 degrees
April 29, 2009

Advanced Math
Can someone check these for me? Please? Use half-angle identity to find the exact value of cos165 degrees. (-1/2) sqrt(2+sqrt(3)) Write the equation 2x+3y-5=0 in normal form. (-2sqrt(13)/13)x- (3sqrt(13)/13)y+ (5 sqrt (13)/13) = 0 Find the distance between the lines with ...
April 28, 2009

Advanced Math
Solve 4sin^2 x + 4sqrt(2) cos x-6 = 0 for all real values of x. My answer: (pi/4)+2(pi)k, (7pi/4) + 2(pi)k Solve 2cos^2 x-5cosx+2=0 for principal values of x. My answer: 60 and 300 degrees.
April 28, 2009

religion
I need to find the Historical figures and events, Central beliefs Nature of God, Texts, Ritual and practice (sacred elements & their meaning,) Ethics and morality for Hinduism
April 23, 2009

religion
Hinduism,Historical figures and events, Central beliefs Nature of God, Texts, Ritual and practice (sacred elements & their meaning,) Ethics and morality
April 23, 2009

Government
Laws that treat men and women differently: A. are always constitutional. B. are always unconstitutional. C. may be upheld by the Supreme Court if the meet certain criteria. D. may be passed by Congress, but not the states. My book says absolutely nothing about this, but I was ...
April 22, 2009

chemistry
Or would the bis(trichloromethyl) carbonate(triphosgene) react with itself to form the CO2
April 21, 2009

chemistry
How would CO2 form from the reaction of 3-methyl benzoic acid with bis(trichloromethyl) carbonate (triphosgene)? Is it possible to form CO2 from a mixture of dichloro ketone in heat?
April 21, 2009

algebra
i need help with these kind of problems 3x(3x + 5)(10x+2)
April 20, 2009

Chemistry
How would you scale down an organic chemistry experiment? Would you have to know an expected percent yield to scale it down?
April 14, 2009

pre cal--check
Name all the values of x that are not in the domain of f(x) = (2–x^2)/ (x+ 5) I got only x= -5 because that's the only value that would make the denominator zero.
March 31, 2009

college
Business Communications
March 24, 2009

college
Request for sample letters containing bad news messages. Need a few realy quick
March 24, 2009

calculus
26. A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has traveled another mile, it is going 80 mph, and the plane has traveled another 5 miles and is going ...
March 16, 2009

Chemistry
Thanks for the push in the right direction, I found the standard reduction potentials. Ag+ --- +0.799 H2 --- 0.0 H+ --- -0.83 Cl2 --- +1.359 Al3+ --- -1.66 I chose Cl2 as the strongest oxidizing agent. Please tell me this is correct.
March 10, 2009

Chemistry
Which of the following species is the strongest oxidizing agent under standard state conditions? a. Ag+(aq) b. H2(g) c. H+(aq) d. Cl2(g) e. Al3+(aq) I think Ag+(aq) will transfer electons sooner than the other four choices. BECAUSE: H2 will hold on it its elcctrons because the...
March 10, 2009

Chemistry
Which of the following species is the strongest oxidizing agent under standard state conditions? a. Ag+(aq) b. H2(g) c. H+(aq) d. Cl2(g) e. Al3+(aq) An oxidizing agent is a substance that gains electrons in a redox chemical reaction. I think Al3+ has a very high electron ...
March 10, 2009

chemistry
In the following half equation, which is the oxidizing agent? NO3–(aq) + 4H+(aq) + 3e– <--> NO(g) + 2H2O a. NO3– b. H+ c. e– d. NO e. H2O An oxidizing agent is a chemical compound that readily transfers oxygen atoms, or is a substance that gains ...
March 10, 2009

chemistry
In the following half equation, which is the oxidizing agent? NO3–(aq) + 4H+(aq) + 3e– <--> NO(g) + 2H2O a. NO3– b. H+ c. e– d. NO e. H2O An oxidizing agent is a chemical compound that readily transfers oxygen atoms, or is a substance that gains ...
March 10, 2009

math 7th grade
A coin is tossed. If a head appears, a spinner that can land on any of the numbers from 1 to 5 is spun. If a tail appears, the coin is tossed a second time instead of spinning the spinner. What are the possible outcomes? A. (T,H)(T,T)(T,1)(T,2)(T,3)(T,4)(T,5) B. (T,H)(H,H)(T,1...
March 8, 2009

math
A coin is tossed. If a head appears, a spinner that can land on any of the numbers from 1 to 5 is spun. If a tail appears, the coin is tossed a second time instead of spinning the spinner. What are the possible outcomes? A. (T,H)(T,T)(T,1)(T,2)(T,3)(T,4)(T,5) B. (T,H)(H,H)(T,1...
March 8, 2009

Biochemistry
How were the 3 coupling sites in phosphorylation discovered using ETC poisons and artificial electron acceptors?
March 7, 2009

finance
A firm has $600,000 in current assets and $150,000 in current liabilities. Which of the following is correct if they use cash to pay off $50,000 in accounts payable? 1)Current ratio will increase to 5.0. 2)Net working capital will increase to $500,000. 3)Current ratio will ...
March 2, 2009

finance
An increasing average collection period indicates 1)the firm is generating more income. 2) accounts receivable are going down. 3) the company is becoming more efficient in its collection policy. 4) the company is becoming less efficient in its collection policy.
March 2, 2009

Finance Management
Suppose the population of Area Y is relatively young and the population of Area O is relatively old. Would interest rates likely be the same or different in the two areas? Explanin. Would a trend toward nationwide branching by banks and the development of nationwide ...
March 1, 2009

math
solve: x lnx - 30 + 5 lnx - 6x = 0
February 19, 2009

Chem
What is the original molarity of a solution of ammonia whose pH is 11.11 okay i tried to convert to pOH- so i got 2.89 and then to [OH]=1.288e-3 and then solve using Kb=1.8e-5 whats going wrong???
February 14, 2009

Chemistry
okay i dding get 48.8 i got 68...
February 14, 2009

chem
Describe the melting point you expect to observe if the isolated product is the mixture of both syn and anti addition of bromine.
February 6, 2009

chem
write a mechanism for the reaction of sodium chloroacetate with 4-chlorophenolate. - i know its a sn2 mechanism, but I dont know who to go about from here
January 30, 2009

biology
Can someone explain to me how 2,3 BPG works for hemoglobin? BPG affects oxygen binding affinity by binding in a small cavity at the center axis of deoxygenated hemoglobin. In oxygenated hemoglobin, this cavity is too small to effectively accommodate 2,3-BPG. When bound, 2,3-...
January 30, 2009

College Prep
Thank you Ms. Sue
January 28, 2009

College Prep
Scenerio: Two days ago your manager phoned and said he would like to plan a field contact in order to evaluate your promotional deals and marketing skills. He will meet you at Kroger's, your top account, at 2:00 p.m. You immediatly got antsy because you know how important ...
January 28, 2009

chem
thank you sooo much. you guys are great.
January 16, 2009

chem
What would be the effect of raising the temperature and increasing the carrier gas flow rate on the ability to resolve two closely spaced peaks in gas chromatography? -I was thinking that the width or the maximum peak of each curve will change since the retention time is ...
January 16, 2009

History - School Project
Can someone please help me think of some ideas for an invention project? We just learned about some famous inventors in history and we have to now come up with our own invention. This can be something totally new, or it can be an improvement on a previous idea (but must have 3...
January 16, 2009

Math
5+67=
January 9, 2009

arithmetic
n=(3/5)2N=
January 8, 2009

physics
Two balls are connected by a string that stretches over a massless, frictionless pulley. Ball 1 has a mass of 0.45 kg and is held 0.74 m above the ground. Ball 2 has a mass of 5.7 kg and is held 0.88 m above the ground. When the balls are released, ball 2 falls to the ground, ...
December 22, 2008

Physics
Two balls are connected by a string that stretches over a massless, frictionless pulley. Ball 1 has a mass of 0.45 kg and is held 0.74 m above the ground. Ball 2 has a mass of 5.7 kg and is held 0.88 m above the ground. When the balls are released, ball 2 falls to the ground, ...
December 21, 2008

social studies
what is the largest river that runs through asia
December 17, 2008

economics
I answered some questions. pls check if they are correct and pls help in questions e and f. Production Possibilities Possibility Maximum Units of Good A Maximum Units of Good B a 200 0 b 180 60 c 160 100 d 100 160 e 40 200 f 0 220 a. Plot these production possibilities, label ...
December 15, 2008

math
Tom spent (in order) a third of his life to date in the united states, a sixth in india, twelve years in egypt, half the remainder of his time in australia, and as long in canda as he spent in india. where did he spend his fortieth birthday? use an alegbraic equation to solve ...
December 15, 2008

Math
1)Write a quadratic equation with integer coefficients that has -4+7i(Radical 3) and -4-7i(Radical 3) as its roots. 2) Solve your answer to part 1 using the quadratic formula verifying your answer
December 11, 2008

pre cal
solve for x: x^(2/3)=(1/27) (2^(x)+4)/(2^x)=2 explain please
December 7, 2008

physics
a crane drops a .3 kg steel ball onto a steel plate. the ball's speeds just before impact and after are 4.5 m/s and 4.2 m/s respectively. If the ball is in contact with the plate for .03 s, what is the magnitude of the average force that the ball exerts on the plate during...
December 4, 2008

chem
which of the following could be used to dissolve a carboxylic acid into the aqueous phase? a)MgSO4 b)1.5 M HCl c)1.0 M NaHCO3 d)2.0 M Na2SO4 e)saturated NaCl I'm leaning towards choice e because you can have an aqueous solution of sodium salt and a carboxylic acid.
December 3, 2008

English
What does Martin Luther King mean by "Continue to work with the faith that unearned suffering is redemptive?"
December 2, 2008

central america & the caribbean
yea ok kool,
December 1, 2008

central america & the caribbean
aight then thanx
December 1, 2008

central america & the caribbean
word bank : belize,costa rica ,coffee, cuba,honduras,lead,mestizos,multicultural,oil,panama canal,puerto rico,rice,sugar cane, slavery,canal 2.___was introduced in the caribbean after indians died from european diseases. 3.central america is an ___between north and south ...
December 1, 2008

CHEMISTRY
Observations Mass of Fe metal:100 MG Volume of water in Calorimeter: 100 ML Mass of water in Calorimeter (use 1g per ml): 100G Initial Temperature of metal: 20 Initial Temperature of water: 20 Final Temperature (both metal and water): 100 Determine the heat gained by the water...
November 30, 2008

English- vocab
can you please help me figure out a word that means something that happens for no reason and we dont know the reason why it happens. i dont think its mystery, I'm not sure.
November 28, 2008

chem
Would you expect 2-chlorobutane to react faster or slower than 2-bromobutane under Sn1 conditions? Sn2 conditions?
November 24, 2008

chem
would you expect 2-chlorobutane to react faster or slower than 2-bromobutane under sn1 conditions? sn2 conditions? - would it slower because of the stronger bond? and it would be sn2 reaction? i'm i on the right track?
November 24, 2008

chem
List the experimental conditions that favor Sn1 reactions, and those that favor Sn2 reactions.
November 24, 2008

chem
(R)-(+)- limonene has a boiling point of 176 C. What made it possible to steam distill it at 100C? - is it because you could have different weights of each one?
November 24, 2008

Chem
How would you expect the following series of compounds to compare in behavior in teh two tests(SN1 vs. SN2)? CH3CH=CHCH2Br (1-bromo-2-butene) CH3-C=CHCH3 l Br CH3CH2CH2Br (1-bromopropane) I know primary alkyl halides like 1-bromopropane favor SN2 reactions and tertiary alkyl ...
November 22, 2008

math
Using the table (ADBC)= 8 (DACB)=5 (BADC)=3 (BDCA)=1 (DCAB)=2 (it is supposed to be a table but the table won't paste correctly). Deter mine: a) deter mine the winner using the Borda count b) deter mine the winner using the Hare method? What round did you find an answer? ...
November 20, 2008

math
Sorry that did not come out good. Let me try again. In voting of 4 candidates, the outcomes are recorded as: (ADBC)=8 (DACB)=5 (BADC)=3 (BDCA)=1 and (DCAB)=2. It is supposed to be a table but it didn't copy. Using this table, determine: a)what is the total number of votes ...
November 20, 2008

math
(ADBC) (DACB) (BADC) (BDCA) (DCAB) 8 5 3 1 2 Using that table, determine: a) the total number of votes b) what does (ADBC) mean c) What the "8" mean d)how many votes will be necessary for a majority, why? is a)19 b) rank c) the number of votes d)?
November 20, 2008

chem
An optical rotation study gives a result of alpha=+140 degrees. Suggest a dilution experiment to test whether the result is indeed +140 degrees, and not -220 degrees. -could polarimetry experiment be used to find the r and s isomer?
November 18, 2008

Chem
A sample of 2-butanol has a specific rotation of 3.25. Determine the % ee and molecular composition of this sample. The sepcific rotation of pure (+)-2-butanol is +13.0. is it (3.25/13.0)x100%= 25%... i'm a little confused on the molecular composition though.
November 18, 2008

Chem
What determines whether 2-bromobutane undergoes an Sn1 or an Sn2 reaction how would you favor SN2 formation?
November 17, 2008

Math
your mom
November 13, 2008

chemistry
we did an extraction of a mixture between neutral compound fluorene and an unknown carboxylic acid. Diethyl ether was used as the organic solvent while NaOH was used as the aqueous solvent. After extracting the unknown acid we also had to extract the neutral compound and to do...
November 9, 2008

chemistry
what experimental difficulty would you encounter if you had neglected to include a drying step before evaporating the ether solution of the neutral organic compound? Water was added to the organic solvent ,but a drying agent wasn't added. So would the difficulty be a ...
November 9, 2008

chemistry
Calculate the number of grams of reactant left over when 28.35 grams of silver reacts with 50.0 liters of air at STP which is 20.9476 % oxygen by volume. The density of air at STP is 1.292 g/L. attemtp at solution volume of oxygen= .209476*50L=10.5L How do i go from volume of ...
November 8, 2008

chemistry
Calculate the number of grams of reactant left over when 28.35 grams of silver reacts with 50.0 liters of air at STP which is 20.9476 % oxygen by volume. The density of air at STP is 1.292 g/L. attemt at a solution: m = dv = 64.6 g of air moles silver =28.35/108=0.26 moles of...
November 7, 2008

chemistry
A sample of acid (C,H,O) massing 1.000 g burns to give 1.466 g of carbon dioxide and 0.6001 g of water. The molecular mass is approximately 120 g/mol. Calculate the molecular formula of the acid
November 7, 2008

Chem
What experimental difficulty would you encounter if you had neglected to include a drying step before evaporating the ether solution of fluorene?
November 5, 2008

Chemistry
how do u draw the lewis structure of F3S-SF
November 4, 2008

Chemistry
What is the geometry of S2O82- its basically two SO4 molecules connected by the O-O bond
November 4, 2008

chem
A student carried out a simple distillastion on a compound known to boil at 124 C and reported an observed boiling point of 116-117 C. Gas chromatographic analysis of the product showed that the compound was pure, and a calibration of the thermometer indicated that it was ...
November 3, 2008

chem
why would it be dangerous to heat a liquid in a distillation apparatus that had no vent or opening to the laboratory? - is this because the liquid will create vapor pressure and could cause a serious injury to a student?
November 3, 2008

chem
why do we add boiling chips or boiling stones before the distillation starts? Boiling chips should never be added to a hot solution!Why? i don't know what the answer is to the first one, but as for the second i think i have a clue. is it that the boiling chips will start a...
November 2, 2008

Math
Okay tell me if thease lines are parallel, perpendicular or neither. y=3x-2 y=1/3x+2
October 28, 2008

algebra
u solve the equation and the point should be the the end of the solution.
October 28, 2008

chem
Thank you soo much for all of your help!!!
October 28, 2008

chem
K2CO3 is an excellent drying agent for some classes of organic compounds. would it be a better choice for an acid (RCO2H)or an amine(RNH2)? why? i know this is RNH2. could it be explained that potassium carbonate itself is basic so it will make water and a salt if mixed with ...
October 28, 2008

chem
what precautions should be observed when an aqueous sodium carbonate solution is used to extract an organic solution containing traces of acid? is it that aqueous sodium carbonate is extremely combustible, which can't be exposed to an open flame?
October 28, 2008

chem
what precautions should be observed when an aqueous sodium carbonate solution is used to extract an organic solution containing traces of acid? is it that aqueous sodium carbonate is extremely combustible, which can't be exposed to an open flame?
October 28, 2008

chem
a crude non acidic product mixture dissolved in diethyl ether contains acetic acid. describe an extraction procedure that could be used to remove the acetic acid.
October 28, 2008

physics
the period of a comet is 100 years. At ists closest approach(perihelion), it is 0.37 AU from the sun. What is the semi-major axis of the comet's orbit? How for does it get from the sun(what is its aphelion distance)?
October 25, 2008

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