Saturday
October 25, 2014

Posts by David


Total # Posts: 1,685

Engineering
Determine the required nominal diameter of a threaded steel rod to carry an axial load of 16,000 pounds in tension if the tensile stress of 20,000 psi is permitted.
February 12, 2009

chemistry
a 16.2 L sample of CO(g) at 1.50 atm and 200.*C is combined with 15.39g of Fe2O3(s), How many moles of CO(g) are availabe for the reaction
February 11, 2009

AP Calculus
how do you evaluate integral of [lxl] from (0,2) , a step function. would you just do it as if it were a absolute value and then do two different integrals?
February 10, 2009

Calc
find the area between y=x^3–14x^2+45x and y=–x^3+14x^2–45x i am having trouble how the graphs look like and how to do this...
February 4, 2009

chemistry
.77
February 2, 2009

statistics
The questioner doesn't want the weighted mean, she wants the mean of the difference. This is equal to the difference between the means, or 0.12.
January 30, 2009

Math
You have a mean score of 86 on 9 quizzes. The teacher decides to drop your lowest quiz score to determine your final quiz mean. After dropping the lowest score, your mean score on the 8 remaining quizzes is 88. What score was dropped?
January 29, 2009

the novel "Ordinary People" by Judith Guest
Has anybody read this book? I have a few questions to ask, I've read the book but forgotten a few things reply ASAP!
January 28, 2009

Physics
(a)M.A=2 (B)F=186.6N(C)MASS=20KG,W=173N
January 21, 2009

accounting
Are condominiums taxable or exempt
January 14, 2009

12th grade English
A Lesson Before Dying- Quotations Analysis. " I had gone to barbershops;I had stood on street corners, and i had gone to many suppers in the quarter.But i had never really listened to what was being said.Then i began to listen, to listen closely to how they taked about ...
December 2, 2008

Finance-options
this was an exam question...i answer for a) long call option b) long put option. But i got it wrong, the instructor won't tell us the answer, he wants us to figure it out ourselves. But i just don't know. Any guidance would be helpful.
December 2, 2008

Finance-options
I need help on the following question. Suppose that you are the manager and sole owner of ahighly leveraged company. All the debt will mature in one year. If at that time the value of the company is greater than the face value of the debt, you will pay off the debt. If the ...
December 2, 2008

Chemistry
thanks a lot !!!
November 30, 2008

Chemistry
Q1. What will be formed when propanone reacted with sodium hydrogensulphite? There is white precipitate is the resulting solution . Is it sodium carbonate? Q2. What are the difference in the products bewteen the reaction of ethanal and propanone reacting with 2,4-...
November 30, 2008

Chemistry: ketone and aldehydes
Q1. What will be formed when propanone reacted with sodium hydrogensulphite? There is white precipitate is the resulting solution . Is it sodium carbonate? Q2. What are the difference in the products bewteen the reaction of ethanal and propanone reacting with 2,4-...
November 29, 2008

Chemistry
Q1. What will be formed when propanone reacted with sodium hydrogensulphite? There is white precipitate is the resulting solution . Is it sodium carbonate? Q2. What are the difference in the products bewteen the reaction of ethanal and propanone reacting with 2,4-...
November 29, 2008

French
Please correct the verb tenses in the following paragraph Alceste, le gros copain de Nicolas, se passionne pour la nourriture. Chaque fois qu’il sort avec ses amis il a envie de manger. La semaine dernière ses amis et lui ont décidé d’aller au ...
November 19, 2008

Financial management
evaluates investment opportunities using payback. The finance director who has been with the company since its formation in 1975, has recently heard that this method may not be the best for evaluating long term projects. You have been brought in to advise the company and have ...
November 18, 2008

English
Leaving Home(the play)proves that the family structure is by far the greatest cause of people's social dysfunctioning. say why you agree or do not agree with this statement.
November 11, 2008

math help me
sorry because of misunderstood of the question. The above answer is wrong
November 9, 2008

math help me
case 1 : both bottle give red balls 1/2 * 1/2 = 1/4 case 2 : one bottle gives red ball 1/2 * 1 =1/2
November 9, 2008

chem
methanoic acid react with potassium dichromate to form what? A colorless solution and CO2 is formed as known
November 9, 2008

math
Find the first and third quartiles, Q1 and Q3, of the following set of numbers. 14, 4, 13, 18, 8, 15, 8, 3, 11, 8
November 6, 2008

math
-1/2- (-5/8)=
November 5, 2008

math need help please
-9 to the 2nd power - (-6) to the 2nd power
November 5, 2008

Pharmacy Math
The dose of gentamicin sulfate is 1.7mg/kg. How many mls of an injectable solution containing 40mg/ml should be administered to a person weighing 220 pounds? Any help is appreciated.
November 3, 2008

Pharmacy Technician
A physician prescribed 5mg/kg q day of a drug for a patient that weighs 132 pounds. How many 100mg tablets will be needed for a 2-week prescription?
November 2, 2008

Need Help on this Microeconomics question, really
If firms in perfect competition all pay the same price for resources and all receive the same price for outputs, how can they have different total profits or different profits per unit sold?
November 1, 2008

Math
Make up a data set of at least 12 numbers that have the following landmarks. Maximum : 18 Range : 13 ___________________________________ ___________________________________ ____ mode: 7 median: 12
October 27, 2008

seventh grade science
Thank you!
October 25, 2008

seventh grade science
Thank you. I looked it up in a dictionary, but I do not understand the terminology. Can you please explain it in a simpler language? Thank you.
October 25, 2008

seventh grade science
what is a monomer what is a polymer what is the structure of a protein
October 25, 2008

Need examples of variable and fixed inputs (micro)
I just need some example of fixed and variable inputs.
October 24, 2008

Math
Imagine there are 100 lockers. Each locker is given a number 1-100. When the students are assigned to their lockers, the 1st student runds down the row of lockers and opens every door, student #2 closes the doors of locker #'s, 2,4,6,8, etc. to the end of the line. Student...
October 23, 2008

Microeconomics help please (urgent)
True or False? Explain your reasoning. a. The short-run average total cost can never be less than the long-run average total cost. b. The short-run average variable cost can never be less than the long-run average total cost. c. In the long run, choosing a higher level of ...
October 22, 2008

8th grade
I went to an unscramble a word site and came up with this "Zach's Word Unscrambler" Results The scrambled word you entered was "afsedrniru " ... Sorry, No Matches Were Found...
October 15, 2008

Microeconomics (margin Utility) need clarification
Someone was kind enough to help me with this question, but i was still confused on how they helped me with the first part of my question. The original question was: You go to an auction and set a maximum price of $100 you are willing to bid on an item. However, you are ...
October 15, 2008

Microeconomics help please (urgent)
Thank you. I will remember the advice in the future:)
October 15, 2008

Microeconomics help please (urgent)
You go to an auction and set a maximum price of $100 you are willing to bid on an item. However, you are fortunate and purchase it for $50. 1) Does the lower price alter the marginal utility you originally placed on the item? 2) Is your potential total utility increased ...
October 15, 2008

Math
Let f(x) = 1/(x+7)+15/(x-8). Find all a for which f(a)=f(a+15). How do I solve this problem? I understand this so far f(a)=f(a+15) 1/(7+a) + 15/(a-8) = 1/(a+22) + 15/(a+7) I am lost after that This is a multiple choice question and I am not getting any of the choices a.) -161/...
October 12, 2008

Formula help
This is a multiple choice question and I am not getting any of the choices a.) -161/8 b.) 120/7 c.) 161/7 d.) -17
October 12, 2008

Formula help
Let f(x) = 1/(x+7)+15/(x-8). Find all a for which f(a)=f(a+15). How do I solve this problem?
October 12, 2008

Help
Now solve for speed of wind in the first equation.. 33km/time=32km/hr-speedwind. How do I do that?
October 12, 2008

Physics
You should start by listing the given information. vi = 0 vf = 100 m/s t = 12.5s a = (vf-vi)/t A). a = (100m/s - 0m/s)/12.5 s a = 8.00 m/s^2 B). You can use several equations for this question. I'm going to use: d = (vf + vi)/2 * t. d= (100m/s + 0m/s)/2 * 12.5 s d= 625m C...
October 7, 2008

o-chem
explain how the rate of crystal growth can affect the purity of a recrystallized compound
October 7, 2008

o-chem
explain how the rate of crystal growth can affect the purity of a recrystallized compound
October 7, 2008

o-chem
well im confused because you said one needs to be great and the other has to be poor. so if you combine both do you get a great solvent or a horrible one?
September 29, 2008

o-chem
thanks. i understand why e won't work, but im a little confused on choice a. they both dissolve a wide range of solutes so would it be a great solvent?
September 29, 2008

o-chem
Explain whether or not each of the following pairs of solvents might be useful as a solvent pair for recrystallization. (a) ethanol-methanol (b) hexane-cyclohexane (c) acetone-ethanol (d) water-ethanol (e) water-cyclohexane
September 29, 2008

O- chemistry
During a recrystalliztion experiment, a student allows the hot solution to cool to room temperature, then chills the solution in an ice bath. Is the student using correct recrystallization technique? Why does the student not simply chill the hot solution in an ice bath initially?
September 29, 2008

AP US History
1775 to 1800
September 24, 2008

Re
i need to find eveidence of 3 things that jesus did and 3 things jesus didn`t do. thanks!
September 22, 2008

grammar
What part of speech is the word "Below" used in the following sentence. Below the main level, we have a large playroom.
September 16, 2008

education
Just to take the very first term you've listed, are you suggesting that income is a characteristic of a multicultural school? What would that mean - that a multicultural school has income? And if so, is that what you're trying to say? I don't think it is, is it? Or...
September 13, 2008

Calculus
8/h -> infinity as h -> 0, so I don't see how the above expression can tend to anything other than minus infinity.
September 12, 2008

Math
Can I throw in a note of clarification? Melissa'a answers are actually correct: what's INcorrect is the algebra that apparently gave rise to them. As Bob pointed out, the "16 divided by 6" is actually a measure of inches per car, not cars per inch. Also, the ...
September 10, 2008

algebra ll
im having trouble with this problem 6( n - 4 ) = 3n
August 26, 2008

Math
No, I'm sure the problem is written like this: [(3a^3-27a)/(2a^2+13a-7)]/[9a^2/4a^2-1)] And to divide you multiply by the reciprocal. So i still don't get the problem I also know to factor, but I'm stil confused.
August 7, 2008

Math
No, I'm sure the problem is written like this: [(3a^3-27a)/(2a^2+13a-7)]/[9a^2/4a^2-1)] And to divide you multiply by the reciprocal. So i still don't get the problem I also know to factor, but I'm stil confused.
August 7, 2008

Math
I'm totally stuck on this problem!! Simplify: (2a^2+13a-7/3a^3-27a)(4a^2-1/9a^2)
August 7, 2008

Algebra II/Trig
No, Problem! Thank you so much for the answer!
August 7, 2008

Algebra II/Trig
Simplify: (n/4)/(n/m) As my answer I got: 4m Is this response correct? If not, please let me know what I did wrong.
August 7, 2008

Math check
No, you distributed the 4 to the y only. You also need to distribute the 4 to the 8. This would then make the answer 4y+32
August 7, 2008

Math
Simplify: 24w^7t^4/6w^9t^2 And How Exactly do u do this? I got 4w^16t^6
August 5, 2008

Algebra II/Trigonometry
Thank you so much drwls! I can not believe I did not figure that out!
July 27, 2008

Algebra II/Trigonometry
Simplify this problem: (1/2m^4n^5)^2
July 27, 2008

English
No. I think you should work the subject back in, in place of "it" and remove the "s" tacked on to the end of accomplishment
July 27, 2008

math
Can someone show me all the combinations possible with these things A B X Y LB RB LT RT L R U D
July 26, 2008

math
img59.imageshack.us/img59/4912/dsc00716qy7.jpg
July 4, 2008

Physics
A passenger on a train traveling 90km/h on a straight, level track notes that it takes another train (180 m long and moving with constant velocity) 4.0s to pass by. What is the velocity of that passing train relative to the ground? **please include explanation** thnx!!
July 1, 2008

Chemistry
Nope, Kristen is right. It can also be written as 4-methylpent-2-yne but it's the same thing.
June 5, 2008

MAT 116 Algebra 1A
V = 1/5 ð t^2 s
May 26, 2008

Physics **PLEASE HELP**
plz ignore the 1st part just plz help with this: what's the relation between resistance and voltage?
May 22, 2008

Physics **PLEASE HELP**
During a short circuit, why does the voltage go down? I know that the resistance is almost zero...but what's the relation between resistance and voltage?
May 22, 2008

Geometry
They are similar. because ALL triangles have and will always have 180 degrees. BOTH of the right triangles have an 90 degrees angle, which leaves 90 degrees left in both triangles than they have an another angle which is less than 90 (x degree) just by knowing this, you can ...
May 2, 2008

Chemistry
For the following electrochemical cell: Fe(s) | Fe2+(aq) || MnO4–(aq), Mn2+(aq) | Pt(s) Which letter corresponds to the correct balanced chemical equation in an acidic solution? A. 2Mn2+(aq) + 8H2O(l) + 5Fe2+(aq)-> 5Fe(s) + 16H+(aq) + 2MnO4–(aq) B. Fe(s)+8H+(aq)+...
April 21, 2008

Chemistry
For the following balanced equation: 2Ag+(aq) + Cu(s)<->Cu2+ (aq) + 2 Ag(s) Which letter corresponds to the correct cell notation at standard state conditions? A. Cu(s) | Cu2+(aq) || Ag+(aq) | Ag(s) B. Ag+(aq) | Cu2+(aq) || Cu(s) | Ag(s) C. 2Ag+(aq) | Cu2+(aq) || 2Ag(s...
April 21, 2008

chemistry
The first step of the synthesis is described by the reaction below. When 1.200 g of Fe(NH4)2(SO4)2 6H2O is mixed with 13 mL of 1.0 M H2C2O4 , the theoretical yield of FeC2O42H2O is grams. Fe(NH4)2(SO4)26H2O(s) + H2C2O4(aq)-> FeC2O42H2O(s) + (NH4)2SO4(aq) + H2SO4(aq) + 4 ...
April 20, 2008

math
Astro Knots
April 17, 2008

chem
H2 + H2O ->??
April 15, 2008

chemistry
Because solution pH is a measurement of either [H3O+] or [-OH] concentration, the acidic or basic nature of the acids and bases used in this experiment can be ascertained by inspecting just the density (electrostatic) potentials from the products (which contain either H3O+ or...
April 14, 2008

Chemistry
What does the density potential (also known as the electrostatic potential) measure? What do the colors on the images indicate?
April 14, 2008

chemistry
calculate the equilibrium constant for the reactionas written at 940K. NH4Cl->NH3+HCl delta H= NH4Cl -1779, NH3 -46, HCl -92 delta s= NH4Cl - 682,NH3 192,HCl 187 i dont know how to solve for the equilibrium constant without the concentration of the values???
April 14, 2008

chemistry
The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.520. If a trial's absorbance is measured to be 0.275 and its initial concentration of SCN– was 0.00060 M, the equilibrium ...
April 14, 2008

chemistry
thanks
April 10, 2008

chemistry
The correct interpretation of the equation below is:? Fe3+(aq) + SCN¨C(aq)¡ú FeSCN2+(aq) A. The reaction is incomplete because the product is still charged. B. A heterogeneous equilibrium exists because of the charged ions. C. The equilibrium constant is Kc...
April 10, 2008

chemistry
the concentration of OH ions in a household ammonia cleaning solution is0.0035M. Calculate the concentration of H ions. would it be pH=-log (.0035)??? or Kc=1/.0035???
April 10, 2008

chemistry
If a solution is diluted, say by adding 100ml of solvent, does the number of moles of solute change? Does the concentration increase, decrease, or stay the same? i think it depends on what the solvent is, for example if its water then the concentration would decrease?? please ...
April 10, 2008

Algebra 2
A package with square ends has a combined length and girth (girth is the perimeter of a cross section) of 120 in. The surface area of the entire package is 3600 sq. in. Determine the dimensions of thr package. s in.*s in.*l in. one solution is: 11.08in*11.08in*75.68in. find ...
April 8, 2008

chemistry
how would i do something like this? Calculate the concentration of borate ion for each titration. Use the borate ion concentration to determine Ksp at each temperature.
April 8, 2008

chemistry
thanks soo much
April 8, 2008

chemistry
1)Does the solubility of borax in water increase or decrease as temperature increases? 2)Is the solvation of borax in water an exothermic or endothermic process? please help ive tried asking my ta but i cant understand him. he explains it through this weird process.
April 8, 2008

chemistry
Which of the following is NOT true of colligative properties? Colligative properties are... A. dependent on the mass of solute present. B. responsible for lowering the vapor pressure of a solution versus the vapor pressure of the pure solvent. C. independent of the chemical ...
April 7, 2008

chemistry
thanks sooo much
April 7, 2008

chemistry
When 18 g of ethylene glycol C2H6O2 is dissolved in 150 g of pure water, the freezing point of the solution is _C . (The freezing point depression constant for water is 1.86C kg) what i tried was 18/62 to find the moles. then i got .29/.150 to solve for the molality. then i ...
April 7, 2008

chemistry
thanks. sorry i go to ucla.hahaha
April 7, 2008

chemistry
Solid borax dissolves in water according to the equation: Na2B4O7 10H2O(s) 2Na+ (aq) + B4O5(OH)42–(aq) + 8H2O(l) The sign of Ssys will be A. positive B. negative because there are A. more B. less moles of products generated. i've tried solving this problem and i think...
April 7, 2008

math riddle ALGEBRA WITH PIZZAZZ
They are made for two wrists.
April 6, 2008

Accounting Multiple choice
ACON lTD ACQUIRES THE ASSETS AND ASSUMES THE LIABILITIES OF BIRD LTD WHICH HAVE OPEN MARKET VALUES OF A Assets $120,000 Liabilities $15,000 Acorn is to issue a debenture of $50,000 and 10,000 $1 Ordinary shares for the balance of consideration. What will be the credit to the ...
April 3, 2008

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