Questions Asked on
April 10, 2007

  1. chemistry

    The vapour denisty of a mixture containing NO2 & N2O4 is 38.3 at 27 deg C. Calculate the moles of NO2 in 100 g of mixture. The vapor density is the mass of a volume of the mixture divided by the mass of an equal volume of H2 at the same P and T. If we take

    asked by sumati
  2. chem

    Barium nitrate is added to a solution of .025 M sodium fluoride. a) At what concentration of Ba+2 does a precipitate start to form? b) Enough barium nitrate is added to make [Ba+2]= .0045 M. What percentage of the original fluoride ion has precipitated?

    asked by chris
  3. Physics

    Radio amateurs are permitted to communicate on the "10 meter band." What frequency of radio waves corresponds to a wavelengthy of 20m? (The speed of radio wave is 3.00 x 10(8)m/s). Can you help me with setting up the formula? frequency = (wave

    asked by Trey
  4. physics..please help?

    At rest, a car’s horn sound at the note A(440Hz) The horn is sounded while the car is moving down the street. A bicyclist moving the same direction with one third the car’s speed hears a frequency of 415 Hz. What is the speed of the car? Is the cyclist

    asked by sammy
  5. Astronomy

    Calculate the ratio of the escape velocities from the moon and Earth. Calculate the ratio of the escape velocities from the moon and Earth In order to escape the gravitaional pull exerted by a central body on an orbiting object, it must must achieve a

    asked by Manny
  6. AP Chemistry

    1. Equilibrium 2SO3(g) O2(g) + 2SO2(g) A 3.21g sample of sulfur trioxide is placed in a 2.25 L cylinder and allowed to reach equilibrium at a constant temperature of 500 , as shown in the above equation. Analysis shows 1.23 X 10^-2 mol of sulfur dioxide at

    asked by anonymous
  7. physics

    A soft-drink bottle resonates as air is blown across its top. what happens to the resonant frequency as the level of fluid in the bottle decreases?

    asked by kimberley
  8. Chemistry

    What is the solubility of CuCl when it is in a solution of 0.35 M NaCl?(CuCl has Ksp=1.9 x 10^-7) The Ksp is given by Ksp=[Cu+][Cl-] if x=[Cu+] then in our mixture we have x moles l^-1 [Cu+] x moles l^-1 [Cl-] 0.35 moles l^-1 [Cl-] from the NaCl (there is

    asked by Chrissy
  9. Algebra II

    Write the simplest polynomial function with the zeros 2-i, square root of 5, and -2. I know that the conjugates are 2+i and -the square root of five, but when I multiply it comes out wrong. not sure A toy rocket is launched from the ground level with an

    asked by K.
  10. Physics

    A cyclotron designed to accelerate protons of mass 1.673 x 10^-27 kg to an energy of 5.5 MeV has a diameter of 9m. The charge on a proton is 1.602 x 10^-19 C. What magnetic field must be used? I think the formula r = mv/qB should be used but i don't know

    asked by Belle
  11. 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

    asked by barb
  12. physics

    A stereo speaker emits sound waves with a power output of 100W. (a) find the intensity 10.0m from the source. B) find the intensity level in decibels, at this distance. C) at what distance would you experience the sound at the threshold of pain,120dB?

    asked by sammy
  13. earth's systems

    What are the four earth systems? and how do they interact with eachother? Lithosphere, Biosphere, Atmosphere, and Hydrosphere. They operate in an integrated fashion. I recommend you cite some specific interactions. all of the systems work together by air

    asked by Gemma
  14. chemistry,

    in analyzing household bleach. I have a flask that contains 10.00 mL diluted bleach + 0.4g KI + 20 mL distilled water and 20 drops of 2M HCl. To that I titrated 30.60 mL Na2S2O3 and I need to calculate the number of moles of NaOCl reacted. This is what I

    asked by amy
  15. Social Studies

    What was Japan's feudal society around 1854? All I know is the Shoguns. You'll need to research Japan's feudal society. If you post your answer, I'll be glad to critique it.

    asked by Kirby
  16. CHEMISTRY

    How many moles of NAOCl are there in 3mL of bleach solution. The density of the solution is 1.005g bleach soln/mL and it is 5.25% by mass (5.25 NAOCl/100g soln. Can someone tell me if I have this set up correctly? 3mL * 1.005g/1ml * 5.25g/100g* 1mol

    asked by amy
  17. Astronomy

    Given that the mass of the Milky Way galaxy is 10^11 times that of the Sun and that the sun is 2.6x10^20 meters from its center, what is the Sun's orbital speed around the center of the galaxy? How long does it take the Sun to orbit the Milky Way? (In this

    asked by Manny
  18. solving trigonometrical equations

    arctan(tan(2pi/3) thanks. arctan(tan(2pi/3) = -pi/3 since arctan and tan are inverse operations, the solution would be 2pi/3 the number of solutions to arctan(x) is infinite, look at its graph. generally, unless a general solution is asked for, or a domain

    asked by Jen
  19. Physics, still don't get it!

    Good morning. I know I have posted this question several times but I am still getting the wrong answer. So I decided to repost it to get a fresh start. Thanks for your help! A glass bottle of soda is sealed with a screw cap. The absolute pressure of the

    asked by CJ
  20. Astronomy

    A cinder block can be weightless in space. Would you want to kick it with your bare foot? Even If it is weightless, does it have mass? An astronaut, circling the earth in the Space Shuttle, senses that his apparent weight is zero. He cannot feel the normal

    asked by Sunny
  21. Geography.

    What era was each of these physical landform regions formed? 1. Innuitian Mountains 2. Arctic and Hudson Bay Lowlands 3. Western Cordillera 4. Interior Plains 5. Canadian Shield 6. Great Lakes-St. Lawrence Lowland 7. Appalachians thanks so much.^^ Please

    asked by May
  22. calc

    2- The earth’s atmospheric pressure p is often modeled by assuming that the rate dpdhat Which p changes with the altitude above sea level is proportional to hp. Suppose that the pressure at sea level is 1013 millibars (about 14.7 pounds per square inch)

    asked by barb
  23. calculus

    find the solution of the differential equation dy/dt = ky, k a constant, that satisfies the given conditions: y(0)=50, y(5)=100 please show steps. INtegrate dy/dt I think the answer will be in the form of y=e^kt + C check that and see if it works. You

    asked by ae
  24. Elem. Ed. Another Question

    I need help with these questions to make sure I am right. If the art center is orderly and organized, children: 1.should be free to mess up the materials and use them with abandon. 2.are inhibited because the materials are too organized. 3. can find what

    asked by Keisha
  25. equilbrium II

    when CO2 (.15mol) and H2 (.302g) in a 500L vessel at 576'C are allowed to come to equilibrium the mixture contains .000183 mol/L of H20. what is the equilibrium concentration of CO? CO2 + H2 -->

    asked by christine
  26. vsu homework assignment(i need help real bad)

    Write a critical analysis by identifying and assessing the argument in the following passage. We in the rich nations are like the occupants of a crowded lifeboat adrift in a sea full of drowning people. If we try to save the drowning by bringing them

    asked by chris
  27. math: real numbers

    The statement below is false. Correct it by changing two symbols. "The interval (a,b) contains its infimum and its supremum." I'll give you a hint. The interval (a, b) is an open interval. What you need is a closed interval. Parentheses are used for open

    asked by sara
  28. Reading/Writing

    I have been told to write a letter to a character in this story as one of the characters ("The True Confessions of Charlotte Doyle" by Avi), anyone have any tips to really GET into the character and make the letter emotional and yet still into the story?

    asked by Dallas
  29. equilibrium

    when Br2 (5.7mol) and Cl2 (.0934mol/L)in a 61 L vessel at 604'C are allowed to come to equlibrium the mixture contains .0523 mol/L of BrCl. What concentration of Cl2 is reacted? - i know how to find the Kc... Br2 + Cl2 ==> 2BrCl 0.0523 mol/L BrCl at

    asked by christine
  30. critical thinking

    Write a critical analysis by identifying and assessing the argument in the following passage. We in the rich nations are like the occupants of a crowded lifeboat adrift in a sea full of drowning people. If we try to save the drowning by bringing them

    asked by chris
  31. physics-sound

    Explain why your voice seems to sound richer than usual when you sing in the shower?

    asked by kimberley
  32. ethics

    How do you think slavery influenced the evolution of both Black and White America today? Think about the degradation of one person "owning" another human being. The slave owner assumes s/he is superior. The slave assumes s/he is inferior. For many people

    asked by michael
  33. Personal injury/ laws

    i have question about me and my friend suppose me and my friend (soura) are hinking in colorado mountains, there is dog by its owner, who is from Wyoming, bites my friend caused him injury. I want my friend to sue the owner of dog, but my friend doesnt

    asked by Singh
  34. algebra

    needing help with is problem solve for x: 3x-2y=-6 here is my solution 3x - 2y = -6 3x = 2y - 6 x= 2y -6/3 x=2/3y-2 yep that's correct.

    asked by jessica
  35. Math(please help)

    Directions:Solve and explain the inequality using words.Tell which wa shading goes. Problem: 2x>-4 and x-4-4 x>-2 x-4

    asked by margie
  36. Job Application

    What are some good strenghts, and weaknesses to place on a job application. I'm feeling out a job application for papa johns pizza If you have weaknesses, put them...There are no good weaknesses, so don't search for them. But if you have one, such as

    asked by Anonymous
  37. Calculus

    The rate of performance is given by dN/dt=1/(2sqroot(t+1)) where N is the number of unity completed t hours after beginning a new tak. If 2 units are completed afer 3 hours, how many units are completed after 8 hours? N= INT 1/2 (t+1)^(-1/2) I will be

    asked by Chris
  38. algebra

    think of a condition under which product of anytwo binomials is a bionomial. you can support your answer with the help of one of the identies of factorization of polynomials A binomial is a polynomial with two terms. Try (x -a)(x + a)and see what you get.

    asked by Liam
  39. Math

    How can i make nine equations with the numbers 2, 7 and one other number to equal 8. The first equation should have one as the other number, then two and so on up to 9. I can only use a number once for each expression. I can use arithmetic symbols,

    asked by Alexandra
  40. science

    Gametes produced in the process of meiosis in humans (chromosome 4)has a long and short arm the short arm has the gene for Huntington's (H) attached and the long arm the gene for Red hair (R) state the differences in the product cells at telophase II if a

    asked by Gemma
  41. math: real numbers

    Determine whether the following statement is true or fase. If true, provide a proof; if false, provide a counterexample. If S is a bounded set of real numbers, and S contains sup(S) and inf(S), then S is a closed interval.

    asked by sara
  42. math: real numbers

    Prove that the Least Upper Bound Property holds for ℝ if and only if the Greatest Lower Bound Property holds for ℝ.

    asked by sara
  43. chemistry

    Please, can someone help? Evaluate log 1. This is my work up until I have gotten stuck: log 1 1=10^x I can't find a common base for 1 and 10^x. Wow, my apologies, this is algebra, not chemistry. but actually I think they use it in chemistry too... Take the

    asked by Darcy
  44. Mathematics

    I have a simple question but am having a hard time understanding the explanation of an unreasonable answer. Any help would be helpful. The question is, an auditorium holds 137 students but is only 60% full. How many students are in the auditorium? The

    asked by Viv
  45. Math2(Please help)

    Directions:Solve and explain the inequality using words.Tell which wa shading goes. Problem: x+3=>2x+1 and -4x

    asked by margie
  46. English/Grammar/Appositives

    Are the commas a correctly placed? 1. The term hardware refers to the computing equipment, itself. 2. The year, 1975, marked the arrival of the microcomputer Neither of those sentences needs any commas. =) Can u give me 3 examples of similies, metaphors

    asked by Christine
  47. Elem. Ed.

    Portfolios are a collaborative effort in that: A. children,teachers,and specialists can all choose samples to include in a portfolio. B. each item in the porfolio should be discussed with parents before it is included. C. teachers must have input from

    asked by Keisha
  48. Calc Help

    S'(t)= -147.78e^(-0.2t) S=7389 units when t=0 find the function that describes the number of daily sales t days after the end of the campaign Really stuck can someone help me to just find the function so I can head in the right track for the rest of the

    asked by Evan
  49. Calc Help

    The rate of performance is given by dN/dt=1/(2sqroot(t+1)) where N is the number of unity completed t hours after beginning a new tak. If 2 units are completed afer 3 hours, how many units are completed after 8 hours? see your other post under another name

    asked by Evan
  50. Algebra

    X+8 ____ x2 + 11x +24 see other post.

    asked by steph
  51. Physics

    The star has a mass n_1 times that of the planet, which orbits this star. For a person on the planet, the average distance to the center of the star is n_2 times the distance to the center of the planet. In magnitude, what is the ratio of the star's

    asked by Bobby
  52. Calculus

    How do you us implicit differentiation to solve x( y + 2 )^5 = 8 x( y + 2 )^5 = 8 ( y + 2 )^5 d/dx (x) + x d/dx(y+2)^5=d/dx 8 (y+2)^5 + 5x(y+2)^4 dy/dx=0 solve for dx/dy (Broken Link Removed) I assume you want dy/dx. Differentiate both sides of the

    asked by Patti
  53. biology/chemistry

    Please help i am on a dead line and am stuck on this question, Gametes produced in the process of meiosis in humans (chromosome 4)has a long and short arm the short arm has the gene for Huntington's (H) attached and the long arm the gene for Red hair (R) i

    asked by charlie
  54. math

    3 workers picked 66 bushels of peaches. The 1st worker picked 3 times more than the second worker and 2 times more than the 3rd worker. How many bushels did the second most productive worker pick? Let the number of bushels picked by the second worker be x.

    asked by LOis
  55. L>A

    CAN SOMEONE FIND ME A TIME LINE ABOUT AVI? (Avi is a famous writer) THANk YOU!! HAPPY SB07 You should be able to construct a timeline using the dates and Avi's ages by reading this site. http://content.scholastic.com/browse/contributor.jsp?id=3262 Here is

    asked by Lance
  56. math brain teaser

    Here are you a brain teaser. You have to buy at least on of every bird when you are done you will have 100 birds for $100.00 $.05 for Biddie $1.00 for Hen $5.00 for Rooster 19 roosters, 1 hen, 80 biddies

    asked by bo
  57. Statistics

    data from sample of 400 cases, variable has 95% confidence interval of 54.3 to 54.7 I found the mean- how do i find standard error- step by step please. Standard error = sd/√n Note: sd = standard deviation; n = sample size. You'll need to determine the

    asked by Angel
  58. Physics

    Why is the image distance equal to the focal length when the object is a very great distance from a simple thin converging lens? IT is that because all light converges on the focus. THe incoming rays are all parallel with the optic axis.

    asked by Caleb
  59. graphs

    how do i graph y=1/2x-3 well according to the equation y = mx + b, where m = slope and b = y-intercept, the graph hits the y-axis at b = -3 and the slope is 1/2. Remember m moves according to rise/run, so move one integer up then two over to get to the

    asked by landy
  60. math

    If A is a finite set and B is a proper subset of A, prove that |B| < |A|. Hint: B is finite. What is the union of the disjoint sets B and A - B? Note: |A| = size of A

    asked by sara
  61. Business law

    Information which comes to the knowledge of an agent is: a) required to be communicated to the principal in all circumstances. b)is imputed to the principal. c) can be disclosed to the principal only with the third party's consent. d) will result in

    asked by Sue
  62. science

    Granite is an intrusive, felsic rock, which may be produced by partial melting or fractional crystillisation. Explain how these processes can produce felsic magmas from more mafic parent magmas. any ideas please Wouldn't the presence of magnesium and iron

    asked by Charley
  63. biology

    What forms of energy are involved in metabolism? Since this is not my area of expertise, I searched Google under the key words "metabolism energy" to get these possible sources: http://www.elmhurst.edu/~chm/vchembook/5900verviewmet.html

    asked by laura
  64. Chem 011

    I can not figure out how many mols are in 102grams of NH3? mols = grams/molar mass. mols NH3 = 102/17 = ??

    asked by Stephanie
  65. Obesrvation question

    Teacher observation and subjective analysis of children are: 1.similar and done in the same way. 2.different and should be done separately. 3.Easiest to do while supervising. I vote for # 2.

    asked by Rachel
  66. Art

    When teachers discuss the elements of art with students, they may say which? 1. "That's so pretty." 2. "I like that picture." 3 "What's that?" 4. "What strong lines your drawing has." wouldn't the correct answer be #4? Number 1 isn't very specific or

    asked by Logan
  67. social studies

    Which best describes the US forign policy at the outset of WW1? A-isolationist B-internationalist C-indifferent D-imperialist E- interventionist Please tell us your answer and reasonings and we'll be happy to discuss it with you. I say answer A becuase

    asked by ...
  68. Calculus

    I have two problems that I can't figure out for my test review... 1. Productivity: Because a new employee must learn an assigned task, production will increase with time. Suppose that for the average new employee, the rate of performance is given by

    asked by Chris
  69. algbra 2

    1/27+9^4x+5 And what is the question or problem? what is x3-7y=21

    asked by alicia
  70. Math

    ummm what are some tips withh adding and subtracting fraction ? .... and what sign to you use when you have a postive and neg intger and you are add ing and what is it for subtracting I don't know what level you are at, so I will be very basic. The plus

    asked by CHristian
  71. Physics

    The star has a mass n_1 times that of the planet, which orbits this star. For a person on the planet, the average distance to the center of the star is n_2 times the distance to the center of the planet. In magnitude, what is the ratio of the star's

    asked by Tifani
  72. Calculus

    S'(t)= -147.78e^(-0.2t) S=7389 units when t=0 find the function that describes the number of daily sales t days after the end of the campaign Really stuck can someone help me to just find the function so I can head in the right track for the rest of the

    asked by Evan
  73. English/Reading

    I need 3 examples of metaphors and personification in the Book I am Regina by Sally M. Keehn Please tell us what you've found, and we'll be glad to critique your answer. I cannot, since I haven't ever read that book, but there are excellent explanations of

    asked by ReJeana
  74. math b

    if sinx=(4/5), where 0 degrees

    asked by manda
  75. Calc 2

    Ok, I have two questions first: 1. I'm asked to find a cartesian equation for the polar graph of this polar equation: r^2 = sin(2(theta)) The answer I got was (x^2+y^2)^2/(2xy) = 2 Is this the correct way to express it? 2. I need to find the cartesian

    asked by Nikki
  76. math

    the vcr mystery nancy watched the movie shoes n socks on her vcr. the movie lasted 1 hour and 45 minutes. at the end of the movie, the meter on the vcr read + 1:30. What was the reading on the meter when the movie began? Add 1 hour 45 min to 1 hour 30 min

    asked by cella
  77. English thinking

    I am looking for why the media does not talk about bird flue , any more? Is there is some reasons why they do not talk about it anymore, do u have any idea? Yes. It does not sell anymore. Media tend to go with sensationalism, and not cover subjects that

    asked by bob
  78. science

    When all parts of a circuit are composed of conducting materials, the circuit is said to be A. parallel C. open B. shorted D. closed the answer is d. closed

    asked by nelly
  79. Diversity

    Write a 1,050- to 1,400-word research paper identifying the linguistic, political, social, economic, religious, and familial conventions and/or statuses of four Hispanic groups living in the United States. Your paper should cover Mexican Americans, Puerto

    asked by Cathy
  80. Biology

    what differences would there be in the product cells at telephose II of meiosis if there had been one crossing over at a position halfway between the Huntington disease gene and the centromere.

    asked by Gemma
  81. Information Systems

    How do you explain to someone who is not computer savvy how general model of telecommunication works? Wouldn't this depend on the particular model? If you are not aware, there have been many general models of telecommunications. It sells texbooks..

    asked by gina
  82. Occupational Safety

    Compare countries Thailand and South Africa for Occupational Health and Safety statistics..how do they compare? who is in charge of worker safety in those countries? how are the laws enforced? and what are typical violations found and the fines given out

    asked by Ashley
  83. Biology, please help

    Gametes produced in the process of meiosis in humans (chromosome 4)has a long and short arm the short arm has the gene for Huntington's (H) attached and the long arm the gene for Red hair (R) state the differences in the product cells at telophase II if a

    asked by Gemma
  84. business

    In what ways do laws like the Americans with Disabilities Act affect human services organizations? If you look into this you will see that the ADA requires accommodations for indivual with disabilities. These would include people with handicaps and also

    asked by Kasey
  85. Biology: Diabetis insipidus

    Why is the level of AQP2 in the urine of patients with diabetis insipidus are either zero or low

    asked by bonita
  86. math

    Prove that the union of two finite sets is finite. Hint: A U B = (A - B) U (B - A) U (A ∩ B) where U = union and ∩ = intersection

    asked by sara
  87. algebra

    what is the ansewr to this -2-x-3x=50 well you can put all the like terms to one side which gives you: -4x = 52 then dividing by -4 gives you x.

    asked by dee-dee
  88. central

    quadratic equations by graphing The idea is to graph the function f(x)=ax^2 + bx + c, and where it crosses the x axis (y=0) are the real roots.

    asked by teyonna
  89. economics

    how can a loan for school tuition affect the money supply? how can it affect aggregate demand? A loan, taken out of some cash reserve, would increase the money supply. The amount of the increase would be determined by the money-multiplier. The increase in

    asked by Kayla
  90. English

    What does this poem mean exactly? Is it just the poet out on the sea missing his children, or is there more to it? Would the theme just be solitude? "In the land of Wu the mulberry leaves are green, And three times the silkworms have gone off to sleep. In

    asked by Sara
  91. equilibrium III

    what's Kp if Cl2CO was found to be 7.46% decomposed at 395'C when initial pressure is 7.60atm. Cl2CO -->

    asked by christine
  92. Calc Help

    C'(x)= 60sqroot(x+1) FC= 340 R'(x)=80x Finding profit or loss from production and sale of 3 units and 8 units. C(x)=40(x+1)^3/2+300 R(x)=40x^2 P(x)= R(x)-C(x) Are my integrations correct and how would i find profit or loss? INtegrations are correct.

    asked by Evan
  93. Algebra

    How do you solve the following problem? 3(4+4x)= 12x+2 It has no solution. X can be any value, and it wont equal.

    asked by James
  94. History

    In American history, who died on July 4, 1876? According to this site, no noted person died on this date. http://www.brainyhistory.com/daysdeath/death_july_4.html http://www.bklyn-genealogy-info.com/Newspaper/BSU/1876.July4.Acc.html

    asked by Catherine
  95. Algebra

    X+8 ____ x2 + 11x +24 factor the denominator (x+8)(x+3) then reduce by dividing out the common fractions.

    asked by steph
  96. English

    What does the title of a streetcar name desire Have you read the play? Stella: But there are things that happen, between a man and a woman, in the dark, that sorta make everything else seem unimportant Blanche: What you are talking about is brutal desire.

    asked by Tim
  97. mangement

    How might an automobile company use a management information system to reduce its costs and better serve its customers? Explain the various types of input data the system might use, and describe what types of output reports managers would find useful. Wow.

    asked by stacy
  98. math

    in volleyball, you can volley, set, or spike.how many ways can your team make two plays? use tree diagram. thanks Draw three "branches" for the first play, then three branches from each of them for the second "play" for a total of nine. However, two

    asked by dillon
  99. biology

    can anybody tell me what is meant by the term regulating mortality factor and how it can lead to successful biological control of pest in agriculture HI, I am doing tma 7 aswell. if you send ur email i'll send my answer to you. do you know the answer to

    asked by bex