Friday
August 22, 2014

# Posts by Christina

Total # Posts: 829

Math
A rectangular swimming pool that is 12ft by 15 ft has a deck of uniform width built around it. If the area of the deck is 198 square feet, find its width.
February 21, 2008

Honors Geometry
Thanks :) It is 30 by 44 feet :)
February 21, 2008

math
what are the place valuse for decimals?
February 12, 2008

Math
9187.5mg
February 9, 2008

history
i have a bunch of history questions that i cant get. did Sir Walter Raleigh found Virginia? and were books the only publications available during the REnaissance? Who was Geoffrey Chaucer? and one more.. Did Queen Elizbeth and London officials have a cooperative relationship? ...
February 4, 2008

Physical Science
The radius of a certain planet is 6.04x10^7 meters, and its mass is 5.19x10^26 kg. Find the density of this planet. (The volume of a sphere is given by (4/3)(pie)(r^3). Answer in units of grams/cm^3
February 3, 2008

geography
how could i explain ethnic cleansing?
February 3, 2008

science
the portion of your bodys weight which is bone is about? your heart and lungs are protected by your? sunlight aids the body in producing what?
January 9, 2008

human anatomy
what is the cellular level of the digestive system
January 9, 2008

SPELLING BEE
huh!!!!!!!!!!!!!sup anyway
January 9, 2008

essay
I changed my mind. I am doing it on Christine Todd Whitman, the first and so far only female governor of New Jersey. Thanks again for the help!
January 2, 2008

essay
Thanks! I did some prior research, and I think I will write about the current local mayor, although I am still undecided.
January 2, 2008

essay
I am writing an essay on a courageous United States elected official and cannot pick a subject to write about. The official must have been elected since 1956; presidents are not recommended subjects. Any ideas? Any ideas?
January 2, 2008

english
December 19, 2007

You decide to use your body as a Carnot heat engine. The operating gas is in a tube with one end in your mouth (where the temperature is 37.0 C) and the other end at the surface of your skin, at 30.0 C. What is the maximum efficiency of such a heat engine? e=2.26% Suppose you ...
December 15, 2007

math
how many ounces are in a pound?
December 13, 2007

maths
how do you write 2.089 in expanded form
December 13, 2007

Physics
I am beyond lost..I've never had any chemistry and our professor assumed that we had at least a basic knowledge...is there any way you could walk me thought this?
December 9, 2007

Physics
ok, that makes much more sense... then i'm assuming that:n=2 for O2 and the m is .032 ???? M=n*m =2*.032 =.064 Then (1/2)(.064)(492)^2 =7746 ??????
December 9, 2007

Physics
Here is what I've done, hopefully you can identify where I've gone wrong.. =(1/2)(.032)(492)^2 =3873J
December 9, 2007

Physics
Oxygen (O2) has a molar mass of 32.0 g/mol [.032kg/mol]. What is the root-mean-square speed of an oxygen molecule at a temperature of 310 K? Vrms=492 m/s What is its average translational kinetic energy at that speed? Kav= ?? J I am having problems with the second half, ...
December 9, 2007

I'm not getting the correct answer.. this is my work: Q=214.374/4.18 =51.286 51.286=(50)(10^3)T T=.001 Do I need to convert the T to something else? It says to have it in C, which I think it's already in...
December 2, 2007

From a height of 35.0 m, a 1.25 kg bird dives (from rest) into a small fish tank containing 50.0 kg of water. What is the maximum rise in temperature of the water if the bird gives it all of its mechanical energy? (delta)T= ?? degrees C
December 2, 2007

From a height of 35.0 m, a 1.25 kg bird dives (from rest) into a small fish tank containing 50.0 kg of water. What is the maximum rise in temperature of the water if the bird gives it all of its mechanical energy? (delta)T= ?? degrees C
December 2, 2007

Physics -I'm stumped
Europa, a satellite of Jupiter, appears to have an ocean beneath its icy surface. Proposals have been made to send a robotic submarine to Europa to see if there might be life there. There is no atmosphere on Europa, and we shall assume that the surface ice is thin enough that ...
November 30, 2007

Physics
If the force on the tympanic membrane (eardrum) increases by about 1.50 N above the force from atmospheric pressure, the membrane can be damaged. When you go scuba diving in the ocean, below what depth could damage to your eardrum start to occur? The eardrum is typically 8.20 ...
November 29, 2007

Physics
At the time this problem was written, the price of gold was \$427 per ounce, while that of platinum was \$866 an ounce. The "ounce" in this case is the troy ounce, which is equal to 31.1035 g. The density of gold is 19.3 g/cm^3 and that of platinum is 21.4 g/cm^3. a)If...
November 29, 2007

Physics
It is reasonable to assume that the bulk modulus of blood is about the same as that of water (2.20 m). As one goes deeper and deeper in the ocean, the pressure increases by 1.0*10^4 Pa for every meter below the surface. If a diver goes down 33.0 m (a bit over 100 ft) in the ...
November 14, 2007

Physics
In the Grimms' fairy tale Rapunzel, she lets down her golden hair to a length of 20.0 yards (we'll use 20.0 m, which is not much different) so that the prince can climb up to her room. Human hair has a Young's modulus of about 490 MPa, and we can assume that ...
November 14, 2007

Physics
I did that and I'm still getting a wrong answer... Is it possible that my calculations are wrong somewhere else?? I'm at a loss...
November 14, 2007

Physics
It is reasonable to assume that the bulk modulus of blood is about the same as that of water (2.20 GPa). As one goes deeper and deeper in the ocean, the pressure increases by 1.0*10^4 Pa for every meter below the surface. If a diver goes down 33.0 m (a bit over 100 ft) in the ...
November 14, 2007

Physics
I'm still getting A wrong.... F=(1.474*10^9)(7.81*10^-5)/(.25) *.0125 =5755.95 Pa
November 13, 2007

Physics
The Achilles tendon, which connects the calf muscles to the heel, is the thickest and strongest tendon in the body. In extreme activities, such as sprinting, it can be subjected to forces as high as 13.0 times a person's weight. According to one set of experiments, the ...
November 13, 2007

math
Find the surface area of the right prism. The height is 2.5 cm, the lenght is 8 cm, and the width is 5.3 cm. This is confusing. I need help.
November 11, 2007

Physics
The outstretched hands and arms of a figure skater preparing for a spin can be considered a slender rod pivoting about an axis through its center. When the skater's hands and arms are brought in and wrapped around his body to execute the spin, the hands and arms can be ...
November 7, 2007

Physics
I'm on the change in KE part and this is what I get: KEf=(1/2)(2.5*10^-2)(.150*7)^2 =.01378125 KEi=(1/2)(2.5*10^-2)(.300*1.75)^2 =.0034453125 I'm not quite sure what to do with these two numbers... I subtracted KEi from KEf, but was told I had "rounding error"...
November 7, 2007

Physics
A small block on a frictionless horizontal surface has a mass of 2.50×10−2 Kg. It is attached to a massless cord passing through a hole in the surface. The block is originally revolving at a distance of 0.300 m from the hole with an angular speed of 1.75 rad/s. The...
November 7, 2007

English
what is the indirect object in this sentence "Chandler gave her the magazine"
November 6, 2007

Physics
To strengthen his arm and chest muscles, an 83.0 kg athlete 2.00 m tall is doing a series of push-ups. His center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0 cm from the top of his head. Find the force that the floor exerts on each of ...
November 5, 2007

Physics
I can't seem to find where I've gone wrong... Volume=(1/4)PI(.25)^2*15=.736... Mass= V*7800= 5743.2... I=(1/3)M*15^2=430741.8... 10^6=(1/2)Iw^2 w=sqrt(4.64...) w=2.15... w*2[for the 2 blades]=4.309... I tried the above value and was incorrect.
November 3, 2007

Physics
I can't seem to find where I've gone wrong... Volume=(1/4)PI(.25)^2*15=.736... Mass= V*7800= 5743.2... I=(1/3)M*15^2=430741.8... 10^6=(1/2)Iw^2 w=sqrt(4.64...) w=2.15... w*2[for the 2 blades]=4.309... I tried the above value and was incorrect.
November 3, 2007

Physics
M=7800*[(1/4)*PI*(.25)^2*15] KE=(1/2[(1/3)M(15)2]w^2=10^6 KE=2.15... x2 (for the two blades) KE=4.31 would that be in radians or revolutions?
November 3, 2007

Physics
How do I determine the volume of the blade so I can find the mass? I'm not quite sure what shape the figure actually is...
November 3, 2007

Physics
Tidal Energy. If we model 2 blades as thin uniform steel bars 15.0m long and .25m in diameter, at what rate (radians/second and revolutions per minute) must they spin for a turbine to store 10^6 J of energy? Keep in mind that the density of steel is 7800kg/m^3 and density is ...
November 3, 2007

Physics
A CD rotates at 500 (revolutions per minute) while the last song is playing, and then spins down to zero angular speed in 2.60 seconds with constant angular acceleration. The magnitude of the angular acceleration of the CD, as it spins to a stop is 20.1 radians per second ...
November 3, 2007

chemistry
what is the name of the polyatomic ion (C2O4)-1?
November 1, 2007

grammar
books, magazines, newspapers, and movies are either underlined or italicized, while other titles (such as that of a tv show) are put in quotes. the former (books, magazines, newspapers, and movies) is generally italicized when written on the computer, but underlined when ...
November 1, 2007

math
how do you find a percent like 19 out of 50 people like dogs
October 20, 2007

vocab
what is a sentence using it???
October 17, 2007

vocab
I have to do a presentation on the word contempt. I need to think of a fun way to review it and all the other words people presented. Please give me ideas! thank you!
October 17, 2007

science
how does the intertidal zone influence humans?
October 9, 2007

Spanish
i am not exactly sure what you are asking, but if you are looking for the meaning of de Sra, i can tell you that Sra stands for senora, which means de Sra means from the woman OR of the woman.
September 30, 2007

history
thanks. i tried the first site already, but could not find the information i needed. hopefully the third site will help. :)
September 30, 2007

history
what are some of the natural resources found in maryland?
September 30, 2007

science
how old is the sun and the planets? how did the solar system form? what is a good website i can get this information from?
September 13, 2007

math
how do u factor these polynomials~ 5x^2 - 5x-60 81-x^4 18a^2b-50b
September 4, 2007

Algebra 2
3x+2y=6 -6x-3y=-6
September 4, 2007

3(square root of -1)(2+5(square root of -1) -3(2+-5) -9=x+6(square root of -1) -9=x+-6 -9+-6=x -15=x
August 18, 2007

History
This is so dumb, but what year did the Spanish America war begin? http://en.wikipedia.org/wiki/Spanish-American_War
August 10, 2007

Science.
Whats the difference between a scientific theory and a regular theory? A theory may be about anything but a scientific theory is designed to explain some scientific principle. Why people shop at a certain store might be an ordinary theory but why AgCl is more soluble than AgBr...
August 9, 2007

Managerial Economics
The MorTex Company assembles garments entirely by hand even though a textile machine exists which can assemble garments faster than a human can. Workers cost \$50 per day, and each additional laborer can produce 200 more units per day (the same for each additional worker). ...
August 8, 2007

english
If a person's name ends with "the third," do you capitalize "third?" Yes, but it would be preferable to use the Roman numerals (III in this case) after the name. DrWLS is right. Here's an example: Richard III John Edward Jones III See?
July 28, 2007

english
what are the differences between... to wake and to awaken? AND to rouse and to arouse? Here are two discussions of the usage of these words. awake, awaken, wake (up): awake is usually an adjective: "I am awake." Awaken is always a verb, either transitive ("A ...
July 28, 2007

english
which is right...? Pollution, costs of living, and the threat of global warming IS rising. OR Pollution, costs of living, and the threat of global warming ARE rising. The subject is plural (pollution, costs of living, and the threat...), so the verb needs to be plural, too. ...
July 28, 2007

essay topic
I cannot think of a creative essay topic related to the subject of "energy efficiency in my home." Please help! You could write from the point of view of someone who is buying a brand new house and can select all the appliances -- and then do so with energy ...
July 27, 2007

arithmetic
you can email me if you want i have more. A man owned 75 shares of stock worth \$50 each. The corporation declared a dividend of 8 percent payable in stock. How many shares did he then own? 81 shares but how? If a scow is towed at the rate of 3 miles an hour, how many hours ...
July 25, 2007

science(chem) Dr.Bob (activity coeficent)
When a 0.1M solution of weak acid HA was titrated with a 0.1M NaOH. The pH measured when Volbase=1/2Voleq point was 4.62. Using the activity coeficents, calculate pKa. fA-=0.854 and fHA=1.00 For this I'm confused once again. I know that using the activity coeficents I can ...
July 24, 2007

math problems
thanks alot for giving me those sites but i already know this stuff. They dont teach how to read an aritmetic problem so its confusing to me what to do with them, when sometimes its so obvious i just need someone to actually explain it to me in a diffent ways, that i might be ...
July 24, 2007

arithmetics
ok i have a few more questions. this question. If a barrel has a capacity of 100 gallons, how many gallons will it contain when it is two-fifths full? I know its 40 gallons but how and why? this one also. the number of half-pound packages of tea that can be made up from a box ...
July 24, 2007

arithmetics
ok i understand now what 3/4 means and i know what 1/2 of a cup is but what does 3/4 of a cup mean. You can do it with blocks but not with how much is in the cup. I dont understand. will someone help me? You can do it with blocks. Let four blocks equal a cup, then three of ...
July 24, 2007

How many ml of 0.8M KOH should be added to 5.02g of 1,5 pentatonic acid (H2A) Mwt= 132.11 to give a pH of 4.4 when diluted to 250ml before the first eq point pKa1= 4.345 Is the answer 25.2ml? If that IS correct then I need help b/c I can't get that answer... I've got ...
July 23, 2007

I REALLY REALLY NEED this to be checked by the END OF THE Day since my finals are tomorrow and I need to know if this is the correct way to do this type of question PLEASE TELL ME IF IT IS CORRECT. I AM posting this again since nobody replied to the other one The total Carbon ...
July 23, 2007

science( chem)
The total Carbon dioxide content (HCO3- + CO2) in a blood sample is determined by acidifiying the sample and measuring the volume of CO2 evolved with a van slyke manometric apparatuses. The total concent was determined to be 28.5 mmol/L. The blood pH at 37o was determined to ...
July 22, 2007

science( chem)
When a 0.1M solution of weak acid HA was titrated with a 0.1M NaOH. The pH measured when Volbase=1/2Voleq point was 4.62. Using the activity coeficents, calculate pKa. fA-=0.854 and fHA=1.00 For this I'm confused once again. I know that using the activity coeficents I can ...
July 22, 2007

science( chem)
When 100.0ml of a weak acid was titrated with 0.09381M NaOH, 27.63ml were required to reach the equivalence point. The pH at the equivalence point was 10.99. What was the pH when only 19.47ml of NaOH had been added ? I'll just post my work and I need someone to check and ...
July 22, 2007

science( chem)
Find the pH of a solution prepared by disolving 1.00g of glycine amide hydrochloride (BH+) (mwt=110.54g/mol) plus 1.00g of glycine amide (B)(mwt=74.08) in 0.10L PKa=8.04 I got pH= 8.21 Is that correct? This question actually has 4 extra parts but I wanted to make sure I got ...
July 21, 2007

science(chem)
I posted this before but nobody replied so I'll post again... this is in reference to whether textbooks such as Fundamentals of analytical chem should be cited as a literature source in a lab report on the titration of wine with standardized NaOH IF I said that %tartaric ...
July 21, 2007

science( chem)
Calculate the molar solubility of Mg(OH)2 in water I know Mg(OH)2=> Mg2+ + 2OH- 2H2O=> H3O+ + OH- Ksp= [Mg2+][OH]2 Kw= [H30+][OH-] Mass balance [Mg2+]=2[OH] So.. [OH-]=2[Mg2+]+ [H3O+] Charge balance is where I get kind of confused I know that the positive charge is ...
July 20, 2007

science( chem)
For literature citation at the end of a lab report if only the text is used would that have to be cited as well? Or would it not be cited and on the page for literature citation I would type no sources cited? You have to cite anything and everything that is used along with the...
July 20, 2007

science( chem)
For the lab of Determining the % of iron in an iron ore sample The instructions were to: 1) Weigh out btw 0.3-0.4g of iron ore 2) disolve in concent HCl (10ml) and 3ml of 0.25M SnCl2 3) add enough tin so the yellow color disapeared 4) heat until sample decomposes and disolves ...
July 17, 2007

science(chem)
What is Zimmerman Reagent made of? (I know it is acidic b/c I was told after it burned a hole in my jeans) acid? You must mean Zimmermann-Reinhardt reagent (79 g MnSO4, 100 mL of concentrated H2SO4, and 200 mL of concentrated H3PO4, diluted to 1 L) Zimmerman reagent is equal ...
July 16, 2007

science(chem)
For an example of charge balance in my text it says Write a charge balance eqzn for an aqueous sol that contains NaCl, Ba(ClO4)2, & Al2(SO4)3 The answer given is: [Na+] + [H30+] + 2[Ba+] + 3[Al3+]= [ClO4-] + [NO3-] + 2[SO42-] + [HSO4-] + [OH-] I know that the rxns are: NaCl=&...
July 16, 2007

science(chem)
For Mass-Balance eqzns, in my text it is described as "relating the equillibrium concentrations of various species in a solution to one another and to the analytical concentrations of the various solutes. Is the analytical concentration described, the molar concentration...
July 15, 2007

science(chem)
Situation: KMnO4 solution left in buret for awhile...would it be okay to go and titrate with the same solution left in the buret later? And if solution is discarded and refilled later wouldn't the solution go and react with the light thus contaminating the new solution? ...
July 14, 2007

science(chem&statistics)
I have to write a abstract for my paper I was wondering if it was better to write it at the beginning or the end of the lab report. If I was to eliminate 1 value as an outlier would I go and include that in calculations of the RSD? I would assume not since It would affect the ...
July 12, 2007

science (chem& statistics)
For a wine titration my results obtained were... 0.6402%, 0.5814%,& 0.6006% the I calculated was 0.04936 according to my text sometimes the # is expressed in ppt or 100% first which would be correct if asked to submit a RSD for the results of a lab like this and 2nd what would...
July 10, 2007

science (chem)
Does EDTA react with light? I forgot to cover a dilute bottle of EDTA (about 0.01M) and was wondering if that would have any affect on the solution I don't think so. I have used EDTA many times and never covered it or used a tinted container. okay =) i posted an answer to ...
July 2, 2007

CULTURAL DIVERSITY
I need help with an assignment. I am asked to have someone fill out this worksheet. Can anyone Please help? Appendix D United States-Centric Views Comparison Consider this question: What are an average American’s perceptions about Muslim/Arab American and Christian ...
June 30, 2007

science (chem)
In general when instructions are to let a solution cool to room temp would it be incorrect to put the bottle containing the solution into a cold water bath so it could cool faster? Would it affect the solution in an adverse way? or does it depend on what you are cooling? ...
June 27, 2007

science (chem)
what is the chemical eqzn of Na2CO3 + HClO4? Na2CO3 + HClO4 ==> NaClO4 + H2O + CO2 I will leave it for you to balance. how did you get that DrBob The rule on carbonates is: An acid added to a carbonate yields carbon dioxide, water, and a salt. oooh so you had to know that ...
June 24, 2007

science (chem)
For the preparation and standardization of NaOH with KHP im supposed to boil water for 1hr and 30 min to remove CO2....the problem is that if I don't boil it for that long and (30 min) b/c of not enough time but I put the water I boiled for 1/2 hr aproximately into a NaOH ...
June 22, 2007

science (chemistry)
I have to do this lab where I titrate Na2CO3 with HCl dilute solution but i had to add Methyl orange indicator to the solution and im not sure what the endpoint is supposed to be colored, is it supposed to be orange or pink?? im confused and just how orange is it supposed to ...
June 21, 2007

CULTURAL DIVERSITY
Can anyone please read over my assignment and let me know if there are any grammar or spelling errors? CheckPoint: Modern Challenges in Immigration o Should United States government policy favor certain kinds of immigrants? o Should [citizenship] preference be given to the ...
June 15, 2007

Accounting
Hello, I need help with this case please: All Star Cards and Bubble Gum Cards recently formed a New Company “Baseball Trading Cards” in order to combine their respective wholly-owned baseball trading card business. In connection with the formation of Baseball Trading...
June 1, 2007

poetry
i need to write a question poem with 10 lines and that asks a lot of questions i have no ideas please help! Pick a theme, then the questions, then put them in verse. Example: Theme Love questions.. What is how it began where will it lead how will it end and so on... the verse...
May 14, 2007

math
the cost of 6oz. of chicken is \$2.00. how much would it cost for 1.5lbs. of chicken ? (16oz=1lb.) 2 simple ways: 1. if 6 oz cost 2.00 then 1 oz costs 2.00/6 = .3333. and then 16 oz cost 16(.3333..) =5.33 2. by ratios 2.00/6 = x/16 cross multiply and solve for x you will get ...
April 23, 2007

vocab
i need to know if you can change frothed into a verb, adjective, or adverb. and if it can have any prefixes or suffixes. Please help thanks! See my response below. Dictionary definitions will also include part(s) of speech. =) Frothed is a verb. Frothing can be an adjective (...
April 19, 2007

vocab
i need three more sentences using frothed please help!!! thanks so much it means to bubble or foam. i figured out some sentences but now i need to know if you can change it into a verb, adjective, or adverb. and if it can have any prefixes or suffixes. http://www.answers.com/...
April 19, 2007

Math URGENT!!
The speed of a runner increased steadily during the first three seconds of a race. Her speed at half-second intervals is given in the table. Find a lower estimate for the distance that she traveled during these three seconds. t(s) 0 0.5 1.0 1.5 2.0 2.5 3.0 v(ft/s) 0 3 6.6 9.9 ...
April 14, 2007

vocab
what does waylaid mean? http://dictionary.cambridge.org/define.asp?key=89472&dict=CALD
April 11, 2007

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