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August 31, 2014

Posts by Matt


Total # Posts: 1,775

calc- thanks!
is this series convergent the series from n=0 to infinity of (n^2+1)/(n^3+1) i said it converged at n=1
March 17, 2008

calculus
does this series converge, and if so is it absolutely convergent? the series from n=1 to infinity of ((-1)^*n+1))/n^4 I found that by the ratio test it was inconclusive, so no abs. conv is this right? and how do i know if it is simply convergent?
March 17, 2008

calculus
does this series converge, and if so is it absolutely convergent? the series from n=1 to infinity of ((-1)^*n+1))/n^4 I found that by the ratio test it was inconclusive, so no abs. conv is this right? and how do i know if it is simply convergent?
March 17, 2008

pre-calculus
given that c is the logarithm of x in base a, and d is the logarithm of x in base b, find the general statement that expresses the log of x in base ab, in terms of c and d. [*subscripts not included: a,b,ab] loga_x=c ; logb_x=d ...logab_x = [in terms of c and d]
March 16, 2008

chemistry
what is the hybridization at O with the lewis structure of 2-propanone?
March 13, 2008

college calculus
how do you intergrate sqrt((1+((1/4)/(4-x^2)))
March 11, 2008

college calculus
how do you integrate sqrt( x^2 - (x^2)(e^(-2x)) )?
March 11, 2008

chemistry
is calcium carbonate a base? (whats its ph?)
March 6, 2008

calculus
integrate (x+2)/((x^2+2x+4)^2) the usual partial fractions dont work???
March 3, 2008

Chemistr repost
Determine the cell potential (in V) for a platinum electrode in an acidic solution of 0.004M H+(aq), 3.226M ClO4-(aq) and 4.445M ClO3- (aq) ions, coupled to a gold electrode in 3.238 M Au3+ (aq) at 307.10 K. Im confused about the mulitple molarities given for the platinum ...
March 1, 2008

Chemistry
Determine the cell potential (in V) for a platinum electrode in an acidic solution of 0.004M H+(aq), 3.226M ClO4-(aq) and 4.445M ClO3- (aq) ions, coupled to a gold electrode in 3.238 M Au3+ (aq) at 307.10 K. Im confused about the mulitple molarities given for the platinum ...
March 1, 2008

College Calculus
Could someone explain how to distinguish improper integrals in non-mathematical terms so I may understand? Thanks!
February 28, 2008

Maths
Thank you
February 28, 2008

Maths
Solve the problem. Assume that simple interest is being calculated. Round your answer to the nearest cent. Susie borrowed $7500. from a bank for 18 months with interest of 5% per year. Find the total amount she repaid on the due date of the loan. (Use: I=prt)
February 28, 2008

chemistry
If the molecular speed of a gas increases, its rate of diffusion will__________.
February 27, 2008

Chem
what's the answer?
February 27, 2008

General Chemistry
Vinegar is a 5.0% solution by weight of acetic acid in water. Given that the pH for vinegar is 2.41 and that Ka= 1.8E-5 and the density s 1.00g/mL, what is the percent dissociation of acetic acid in vinegar? I know the % dissociation equals the amount which did dissociate 5.0%...
February 27, 2008

Physics
It is probably easy, but i don't know where to start A hockey puck leaves a player's stick with a speed of 9.50 m/s and slides 27.0 m before coming to rest. Find the coefficient of friction between the puck and the ice. Thank You for helping me!!!
February 25, 2008

physics
the tension T=ma, since the only acceleration is that due to gravity.. a=g (9.8m/s^2) so T=0.442*9.8
February 25, 2008

Science Proof-reader needed!
The current research project involves examining the photoreceptors of the fruit fly, Drosophila Melanogaster. Over the last 6 weeks, I have been spending about 2 hours a week working with a program called ImageJ and various slices of photoreceptor cells of Drosphila. I have ...
February 20, 2008

Proofread/Editing
The current research project involves examining the photoreceptors of the fruit fly, Drosophila Melanogaster. Over the last 6 weeks, I have been spending about 2 hours a week working with a program called ImageJ and various slices of photoreceptor cells of Drosphila. I have ...
February 20, 2008

Chemistry
Could I plese have an example of a everday experience of a chemical process for which a rate increases with temperature? I thought of ice melting but its a physical change...
February 19, 2008

College Calculus
What is the integral of cos^6x? I tried half angle identities but it didn't really help...
February 18, 2008

Chemistry
Calculate ∆G (in kJ) at 541 K for the following reaction under the given conditions. Use data obtained from the table below and assume that ∆Hfo and So do not vary with temperature. Report your answer to three significant figures in scientific notation (i.e. 1.23E4...
February 17, 2008

Psychology
What are electrolytic lesions in terms of psychology and the brain? I can't find it anywhere and I dont know what it means...
February 11, 2008

Bio-Genetics
In watermelons the allele for green color and for short shape are dominant over the alleles for striped color and for long shape. A plant with long striped fruit is crossed with one heterozygous for both characteristics. The results are: green, short: 14 green, long: 96 ...
February 9, 2008

Algebra 1
Since it takes 25 minutes at 37.5 MPH, we know that in 60 minutes, they would go 37.5 miles. We need to know how long to commute is. 25/60 = 5/12, so you multiply 37.5 by 5/12. The answer is 15.625, this is how long the commute is. 15 MPH is 4 minutes per mile, so you multiply...
February 7, 2008

Chemistry
The total pressure in a flask containing air and ethanol at 25.7 C is 878 mm Hg. The pressure of the air in the flask at 25.7 C is 762 mm Hg. If the flask is immersed in a water bath at 45.0 C, the total pressure is 980 mm Hg. The vapor pressure of ethanol at the new ...
February 4, 2008

chemistry
A) If you make up a solution of 50 mL of 0.1 M TRIS in the acid form, what will be the pH? (pka of TRIS: 8.3, molecular wt: 121.1 g) B) if you add 2mL of 1 M NaOH to the solution, what will be the pH? Thank you.
February 2, 2008

chemistry
When Dr. Farrell was a graduate student, he once made up a pH 8.0 sodium acetate buffer. Why would the casual observer to this buffering faux pas come to the conclusion that he had the intellectual agility of a small soap dish?
February 2, 2008

chem
The total pressure in a flask containing air and ethanol at 257C is 845 mm Hg. If the pressure of the air in the flask is 762 mm Hg, the vapor pressure of ethanol is ? mm Hg.
January 31, 2008

Physics
well 1 W = J/s So, 19 kW is 19000 J/s. But you want to find time, so you want to have seconds in the denominator, you you would multiply the inverse of the watts times the amount of work. so (1 sec/19000 J) * (6.8 X 10^7 J) Joules should cancel out with joules and you should ...
January 29, 2008

Lab Equipment
alright sorry, I posted that before I saw your second answer but number 2 is crucible so I am all set.
January 29, 2008

Lab Equipment
thanks, I also found that number 1 wish wire gauze. Now I just need number 2
January 29, 2008

Lab Equipment
What is a square mesh with a fiber center used for support? 9 letters, ends with an E What is a porcelain container used to heat things? 8 letters, second letter is "R" What type of bottle is used for storing acids and bases? 7 letters, _E_G_ _T Help? Thanks!
January 29, 2008

Algebra
you cant do that, Miley, the m's and n's are separated by an addition sign, so you cant use the quotient of powers rule
January 28, 2008

Algebra
SImplify: (x - 9/x) / (1 + x/3) and (m^-1 + n^-1) / (m^-3 + n^-3) I have no idea what to do
January 28, 2008

physics
a pulley with rotational inertia of 1.5 times 10 ^-3 kg times m^2 about its axle and a radius of 15 cm is acted on by a force applied tangentially at its rim. The force magnitude varies in time as F=.5t + .3 t^2, where F is in newtons and t in seconds. The pulley is initiall ...
January 28, 2008

Chemistry
Hey, can you help me balance this equation? Cu2S + HNO3 --> Cu(NO3)2 + CuSO4 + NO2 +H2O Thanks!
January 24, 2008

AP CHEM
thanks
January 24, 2008

AP CHEM
what type of cubic structure is iron?
January 24, 2008

Chemistry
thanks, this is how i calculated it: 1 mol Fe/.141 mol/cm^3 = 7.10 cm^3 (the .141 came from converting the density in to moles) is that correct? then the next step in the problem is to find the volume of 1 mol of Fe atoms assuming each atom to be spherical. the atomic radius ...
January 24, 2008

Chemistry
The density of iron at 25 C is 7.871 g/cm^3 what is the volume of one mole of solid iron at 25 C? i understand that volume = m/d but how would i go about solving this?
January 24, 2008

AP CHEM
The density of iron at 25 C is 7.871 g/cm^3 what is the volume of one mole of solid iron at 25 C? i understand that volume = m/d but how would i go about solving this?
January 23, 2008

CHEMISTRY
how is liquid or the inital mass relevant to the question, if we're only concerned with the gas?
January 20, 2008

CHEMISTRY
A glass vessel has a mass of 53.8718 g when evacuated (no air). When filled with a liquid of density 1.319 g mL-1 it has a mass of 255.7390 g and when filled with an unknown gas at 752.3 torr and 16.12°C it has a mass of 54.2483 g. What is the molar mass of the gas, ...
January 20, 2008

For DrBob222
thank you so much for your help, i know it wasnt that difficult, i think i just confused myself with the temperatures. i get the answer now.
January 19, 2008

For DrBob222
i had to convert 38.3 to kelvin... because i converted the initial T to kelvin.
January 19, 2008

For DrBob222
the chemistry question: v=0.465L T=559.15K P=112.496 kPa Pv/t = Pv/t 112.kpa(0.465)/559.15 = (x)(0.464428)/(247.8) x= 49.9 kPa ...i skipped conversion steps, but i'm pretty sure i did those right..
January 19, 2008

Chemistry
A sample of Kr gas has a volume of 465 mL at 286°C and 844 torr. When the gas is cooled by 38.3°C, its volume is reduced by 0.572 mL. What is the final pressure of the gas in kPa? the answer is supposed to be 105 but i keep getting 49.9!!!!!!
January 19, 2008

CHEMISTRY
A 8.90-g sample of ethane, C2H6, is mixed with 18.8 atm of O2 (an excess) in a 1.50 L combustion chamber at 130.0°C. The combustion reaction to CO2 and H2O is initiated and the vessel is cooled back to 130.0°C. What is the final pressure in the combustion chamber ...
January 17, 2008

science
what is a mineral
January 17, 2008

Chem Midterm Review
Ok, so I've been really busy with midterms and my chemistry one is tomorrow. Now, I never intended to let so much time slip by before i started studying, but it happened. It's one of my most important exams. Do I still have a chance of passing? If so, how should I ...
January 16, 2008

math
a. y= 4x b. y= 2x c. y= 1 half x
January 14, 2008

math
identify the value of m in each equation. Then match each equation with it's graph.
January 14, 2008

Calculus
how did you get ry and r^2y for y' and y''?
January 12, 2008

Calculus
I posted this several days ago but it hasn't been answered and I still can't figure it out: For which values of r does the function defined by y=e^(rt) satisfy the differential equation y''+ y'-6y = 0
January 12, 2008

Calculus
For which values of r does the function defined by y=e^(rt) satisfy the differential equation y''+ y'-6y = 0
January 10, 2008

Chemistry
Yeah, I know that, but why can Copper lose either one or two while cadmium only has a +2 OS. I think the answer has something to do with valence electrons, but I'm not sure exactly.
January 8, 2008

Chemistry
Why can Copper have both a +1 and +2 oxidation state?
January 8, 2008

Ap Chemistry
In a class discussion, my teacher told me that 74.06% of the volume of each unit cell is occupied by atoms (in the cubic closest structure). Where does this percentage come from? How can I find it?
January 7, 2008

Angles...
How do i express angles in a radian measure as multiples of pi. For example, suppose i have an angle of 30 degrees, and a angle of -270 degrees. How would I express them in a radian measure as a multiple of pi?. Thanks.
January 6, 2008

Chemistry
Thank you
January 1, 2008

Chemistry
or CH2 double bond C(CH3)CH(CH3)CH3
January 1, 2008

Chemistry
would 1. be CH3C(CH3) Double bond C(CH3)CH3
January 1, 2008

Chemistry
Hey Everyone I was wondering how I could write the condensed structural formula for the following organic chemicals: 1. 2,3-dimethyl-2-butene 2. 4-ethyl-2-hexyne 3. 3,3,6-trimethylnonane 4. 3-ethyl-4-prophylheptane 5. 3-octanol 6. 2-methyl-2-pentene 7. 5-methyl-1-hexene 8. 2,2...
January 1, 2008

Math
List the first eight prime numbers.
December 17, 2007

Writing
I am looking for some written a one act play. Write anc act out a one act play in front of class covering a specific workplace issue , exapmple my include sexual harassment, workplace stress, great/bad bosses etc.
December 10, 2007

physics
The radiation curve of the sun shows that the brightest light fro the sun is yellow- green. Why, then, do we see the Sun as whitish instead of yellow green?
December 8, 2007

physics
then it has to be reading glasses.
December 8, 2007

physics
Suppose that sunlight falls both on a pair of reading glasses and on a pair of dark sunglasses. Which pair of glasses would you expect to become warmer?
December 8, 2007

Chemistry
Barium's Oxidation State is +2, Nitrate's Oxidation state is -1 Does that help?
December 6, 2007

Physics
What two ways can waves interact? ^I have no clue what its asking
December 6, 2007

Is this how you derive the formula for arc length?
in the third step, how did you integrate the right side with no delta-variable?
December 4, 2007

chem
A 1.00 L flask containing 450 torr of H2 is connected to and mixed with a second flask with a volume of 0.500 L containing 250 torr N2. What is the final pressure of the resulting mixed gas system? a) 250 torr b)383 torr c) 450 torr d) 575 torr e) it cannot be determined
December 2, 2007

chem
A 1.00 L flask containing 450 torr of H2 is connected to and mixed with a second flask with a volume of 0.500 L containing 250 torr N2. What is the final pressure of the resulting mixed gas system? a) 250 torr b)383 torr c) 450 torr d) 575 torr e) it cannot be determined
December 2, 2007

chem
Suppose that Quebec had managed to succeed from Canada and became an independent country. Just to be difficult, they decreed that they will only measure pressure in mm Hg and volume in cm3. What value for R, the ideal gas constant, would students in Quebec use when solving the...
December 2, 2007

Math
Prove that a simple graph with n >_ 2 vertices must have atleast two vertices with the same degree. There was a hint given in the book saying that the key to this is the graph can not have both a vertex of 0 degree and a vertex of n-1 degree
December 1, 2007

Math
It means that it is attached to that many other vertexes, say if a vertex is attached to two other vertex by lines then it has degree 2
December 1, 2007

Math
Prove that a simple graph with n >_ 2 vertices must have atleast two vertices with the same degree. There was a hint given in the book saying that the key to this is the graph can not have both a vertex of 0 degree and a vertex of n-1 degree Thanks
December 1, 2007

Math
Use iteration to guess an explicit formula for the sequence. Pk=Pk-1+2*3^k P1=2
November 30, 2007

Business
Can you help me to understand what is the role of power in the control process? I am not even really sure I understand what the question is asking
November 29, 2007

Calc
I did simplify P' to be P'=-2p+33(p-9+100)+1(-p^2+33p+9) now I have to set the derivative,P', equal to zero and I do not know how to solve it.
November 25, 2007

science
How do you measure velocity???????
November 25, 2007

Algebra
I got 3p(-p^2+22) Now what
November 24, 2007

Algebra
I have learned factoring but I do not know what to do for this problem
November 24, 2007

Algebra
How do I solve -3p^2+66p=0
November 24, 2007

PHILOSOPHY REPOST
I'm sorry, I forgot it is thanksgiving in the States.
November 22, 2007

PHILOSOPHY REPOST
why is it wrong to teach creationism in a high school science class, based on the moral theory that the good of many outweigh the good of the individual? and im asking your personal opinion on this, im perfectly capable of going to google and typing in few key words.
November 22, 2007

Chemistry
i cant find a Ka chart that includes all those, and also, i wasnt even any numbers whatsoever to work with!
November 20, 2007

Chemistry
Rank the following compounds in order of increasing acid strength (1 = weakest, 4 = strongest) HCOOH CH2ClCOOH CHCl2COOH CH3COOH
November 20, 2007

Oral speech
bump?
November 19, 2007

Oral speech
Persuasive speech comparing old to modern games? I have to have a persuasive speech lasting 8-10 minutes, in which i am trying to persuade the listeners that modern games have came away from the "point" of a video game. and that old school games like SNES games and ...
November 19, 2007

math
an run contains 40 balls some red and some white if the probability of selecting a red ball is .45 how many red baslls are in the run?
November 19, 2007

ACC
A reason why absorption costing income statements are sometimes difficult for the manager to interpret is that: A)they omit variable expenses entirely in computing net operating income. B)they shift portions of fixed manufacturing overhead from period to period according to ...
November 16, 2007

ACC
When sales are constant, but the production level fluctuates, net operating income determined by the variable costing method will: A)fluctuate in direct proportion to changes in production. B)remain constant. C)fluctuate inversely with changes in production. D)be greater than ...
November 16, 2007

ACC
someone help me with this questions please 1. How would the following costs be classified (product or period) under variable costing at a retail clothing store? Cost of purchasing clothing Sales commissions A) Product Product B) Product Period C) Period Product D) Period ...
November 16, 2007

History
I need to find detailed information on Charles Darwin, specifically, about his results and the RELIGIOUS PERSECUTION involved with it. Thanks in advance!
November 3, 2007

Philsophy
Please help! I need a case of scientific fraud where the scientist was working alone and unwilling to cooperate/get reviewed by other scientists. (the standard of openness must apply) goggle doesnt help at all, as my case is so specific!
November 3, 2007

CHEMISTRY
When 2.47 g of chromium is reacted with an excess of sulphur, the compound Cr2S3 results. Treating the Cr2S3 so formed with strontium metal converts all of the sulphur to SrS. Reacting the SrS with sodium metal then converts all the SrS to Na2S. What mass in grams of Na2S is ...
November 3, 2007

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