Questions Asked on
November 3, 2007

  1. Physics

    The main water line enters a house on the first floor. The line has a gauge pressure of 1.70 105 Pa. (a) A faucet on the second floor, 6.5 m above the first floor, is turned off. What is the gauge pressure at this faucet? (b) How high could a faucet be

    asked by john
  2. Chemistry

    What is the de Broglie wavelength of an oxygen molecule, O2 traveling at 521 m/s? Is the wavelength much smaller or much larger than the diameter of an atom. (on the order of 100 pm) De Broglie wavelength = h/mv h = Planck's constant in J*s. m is mass in

    asked by Lauren
  3. 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

    asked by Christina
  4. economics

    The hand made snuffbox industry is composed of 100 identical firms, each having short-run total costs given by STC=0.5q^2+10q+5 and short-run marginal costs by SMC=q+10 where q is the output of snuffboxes per day. a. What is the short-run supply curve for

    asked by jennifer
  5. chem

    The units of parts per million (ppm) and parts per billion (ppb) are commonly used by environmental chemists. In general, 1 ppm means 1 part of solute for every 106 (one million) parts of solution. Mathematically by mass: ppm = µg solute / g solution = mg

    asked by mel
  6. Science

    Compare and contrast sedimentary rocks that have a granular texture with sedimentary rocks that have a nongranular texture.

    asked by Jenny
  7. Psychology

    Why are twin studies valuable in behavioral genetics research? What does the research say about the effects of environment on IQ scores in poor homes versus affluent homes? What does this suggest?

    asked by Christian
  8. Chemistry

    What is the wavelength of a proton traveling at a speed of 6.21 km/s? What would be the region of the spectrum for electromagnetic radiation of this wavelength. For this one I did the same thing 6.63 X 10^-34/ (? kg)(6210 m/s) = How do get the kg for the

    asked by Lauren
  9. Chemistry

    What is the wavelength of the transition from n=4 to n=3 for Li2+? In what region of the spectrum does this emission occur? Li2+ is a hydrogen-like ion. Such an ion has a nucleus of charge +Ze and a single electron outside this nucleus. The energy levels

    asked by Lauren
  10. Chem

    The space probe Pioneer 11 was launched April 5,1973, and reached Jupiter in December 1974 traveling a distance of 998 million km. How long did it take an electromagnectic signal to travel to earth from Pioneer 11 when it was near Jupiter. The speed of

    asked by Lauren
  11. Physics

    Two metal beams are joined together by four rivets, as the drawing indicates. Each rivet has a radius of 5.0 10-3 m and is to be exposed to a shearing stress of no more than 4.6 108 Pa. What is the maximum tension T that can be applied to each beam,

    asked by joe
  12. Chem

    What is the wavelength of the transition from n=4 to n=3 for Li2+? In what region of the spectrum does this emission occur? Li2+ is a hydrogen-like ion. Such an ion has a nucleus of charge +Ze and a single electron outside this nucleus. The energy levels

    asked by Lauren
  13. Japanese (extramural: linguistics/culture/history)

    Hallo, my name is Joshua. I'm currently doing my matric in south africa, which is most unfortunate, because south africa doesn't have much to offer in terms of "foreign languages/culture." (Moving to england in a month. Perhaps it has more to offer^^) I am

    asked by Joshua
  14. social studies

    what are some inventions from the industrial revolution?

    asked by sarah
  15. chem

    A solution of ethanol (C2H5OH) in water is prepared by dissolving 57.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 240.0 mL of solution. What is the molarity of the ethanol in this solution?

    asked by mel
  16. Financial Management

    HI, could anyone help with this please. :) 2. Find the following values: a) An intial $500 compounded for 10 years at 6 percent b) An intial $500 compounded for 10 years at 12 percent c) The present value of $500 due in 10 years at a 6 % discount rate. d)

    asked by perry
  17. Early Child Ed.

    Cn you help me with this question? Which would be the best answer for this question (B or D)? A normally developing child can learn two languages(English and the native language)simultaneously,provided that: A. the early learning teacher provides language

    asked by Anonymous
  18. Algebra

    Mrs. Lewis plans to drive 900 miles to her vacation destination, driving an average 50 miles per hour. How many miles per hour faster must she average, while driving, to reduce her total driving time by 3 hours? I'm not sure how to set up the equation.

    asked by Rose
  19. chemistry

    [Co(NH3)2(en)2]^+3 what is the A)coordination no. B)no. of ligands C)Oxidation state of Co

    asked by Sam
  20. human risk assessment

    The dose for an incremental lifetime cancer risk of 10-6 (a) Increases as the estimated cancer slope factor increases (b) Decreases as the estimated cancer slope factor increases (c) Is independent of the value of the cancer slope factor

    asked by Thano
  21. Chemistry

    The equilibrium constant for the reaction of bromine and chlorine to form bromine chloride under certain conditions is 4.7x10-2. Cl2(g) + Br2(g) --> 2BrCl(g) K= 4.7 x 10-2 What is the equilibrium constant for the following reaction under the same

    asked by Dan
  22. Physics

    The Mariana trench is located in the Pacific Ocean at a depth of about 10300 m below the surface of the water. The density of seawater is 1025 kg/m3 (a) If an underwater vehicle were to explore such a depth, what force would the water exert on the

    asked by pete
  23. please revise my essay

    Dreams Are Taken Away It was a tough day on September 30, 2002 with a crowd of high school students carrying posters and signs marching in the middle of the street. None of them were happy at all. “Governor Davis is throwing away our future with his

    asked by shylo
  24. Economics

    Suppose that a small open economy begins to use credit cards, starting from monetary equilibrium, allowing households to hold more of their wealth in interest bearing assets. Discuss the effect on real and nominal money supply, foreign-exchange reserves

    asked by Patrick
  25. Science

    Compare and contrast sedimentary rocks that have a granular texture with sedimentary rocks that have a nongranular texture. I have worked on this, and this is a question following an experiment so it's kind of hard to explain. The rocks in the experiment

    asked by Alex
  26. physics

    what is the initial velocity (Vyo) of a projectile launched horizontally? why? i know that it is 0 m/s, but i don't know why/how to explain it.

    asked by beckii
  27. Chemistry

    A container initially has 0.0186 M ammonia at a certain temperature. When the system reaches equilibrium the concentration of ammonia is 0.0035 M. Calculate Kc for the following reaction as written. N2(g) + 3H2(g) --> 2NH3(g)

    asked by Dan
  28. Chemistry

    One mole of methane has a mass of 16.0 grams. 1000cm3 of methane have a mass of 0.174 g. What is the correct expression for calculating the volume of 1 mole of methane?

    asked by Lucy
  29. chem

    A solution is prepared by dissolving 16.5 g ammonium sulfate in enough water to make 145.0 mL of stock solution. A 10.50 mL sample of this stock solution is added to 57.70 mL of water. Calculate the concentration of ammonium ions and sulfate ions in the

    asked by mel
  30. Physics

    A stone thrown horizontally from a height of 7.8 m hits the ground at a distance of 12.0 m. Calculate the speed of the ball as it hits the ground. I was able to find the initial speed of the ball, which is 9.52 m/s. However, I'm unsure about whether I need

    asked by Lindsay
  31. Environmental Science

    List five natural resources you believe are essential for civilization. If htese natural resources become limited because man's overuse or population, how will it have an effect on the individual, community,or population level.

    asked by Bonnie
  32. spanish SRAMCGUINN

    My child was helped so muc hby your spanish lessons. He said your help was amazing - and he got very overhwelmed by missing two days of school b/c of the fires. Even being an honor student Spanish I is the hardest class. I promised i would ask and see if

    asked by sams mom
  33. Math

    Natalie is making a tablecloth for a circular table 3 feet in diameter. The finished tablecloth needs to hang down 5 inches over the edge of the table all the way around. To finish the edge of the tablecloth, Natalie will fold under and sew down 1 inch of

    asked by Alicia
  34. Science

    Compare and contrast sedimentary rocks that have a granular texture with sedimentary rocks that have a nongranular texture. I have worked on this, and this is a question following an experiment so it's kind of hard to explain. The rocks in the experiment

    asked by Jenny
  35. Biology

    Of the following substances, which would react positively with Biuret's, Lugol's, and Benedict's? 1. water 2. starch 3. glucose 4. maltose 5. sucrose 6. fructose 7. galactose 8. albumin 9. hamburger juice 10. onion juice 11. milk 12. potato juice 13.

    asked by Coral
  36. Physics

    At what depth beneath the surface of a lake is the absolute pressure 2 times the atmospheric pressure of 1.01 105 Pa that acts on the lake's surface?

    asked by pete
  37. Financial Management

    Hi, would anyone be willing to help with this. Thanks :) 2. Find the following values: a) An intial $500 compounded for 10 years at 6 percent b) An intial $500 compounded for 10 years at 12 percent c) The present value of $500 due in 10 years at a 6 %

    asked by perry
  38. Early Child Ed.

    Would "D" be the best answer for this question? Which one of the following statements is NOT valid about the presence of a "mismatch between home and school?" A. There are differences in language and social communication patterns. B. Children's early

    asked by Anonymous
  39. human risk assessment

    David Hassenzahl discusses the relative risks of eating peanut butter contaminated with aflatoxin and apple juice contaminated with UDMH, a degradation product of Alar, in the Power Point presentation in the Week Five, Module 5 Conference. The following

    asked by Thano
  40. 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

    asked by Matt
  41. College Algebra

    Please Explain your reasoning Part 1: Suppose that the number of new homes built, H, in a city over a period of time, t, is graphed on a rectangular coordinate system where time is on the horizontal axis. Suppose that the number of homes built can be

    asked by Vision/Help!
  42. physicalscience

    1. which one of the 4 keeps electrons in orbit around the nucleus? electromagnetic force weak force strong force gravity 2. which is the greatest of the 4 fources

    asked by liz
  43. Nihongo for Joshua

    Ohayo, Joshua. A few more things you "might" like! 1. http://members.aol.com/writejapan/ 2. http://language.tiu.ac.jp/index_e.html 3. (toolbox): http://language.tiu.ac.jp/tools_e.html 4. (only because you said you might move to UK):

    asked by SraJMcGin
  44. physical science

    which one opf the 4 forces opposes the electromagnetic force in the nucleus of an atom: strong force weak force gravity I thought it was stong force

    asked by liz
  45. science

    Why does covering and refrigerating food help reduce spoilage from mould?

    asked by Erica
  46. Science

    Dunbar, South Africa identify at least two serious environmental problems, such as soil degradation, air or water pollution, pesticide misuse, overpopulation, wildlife extinction or threatened biodiversity, and deforestation, that impact this region. What

    asked by Daisy
  47. reading

    i an in forth grade and i have to do a book report.

    asked by adrian rodriguez
  48. physical science

    how is subatomic particles related to atomic mass unit how is an electron related t oenergy level

    asked by liz
  49. Business

    True or false: If a manager has control over their subordinates they are using delegation? I think that is false because I would think that is a manager controls their subordinates they are using authority, am I correct?

    asked by Jen
  50. English (Beowulf)

    Well, my assignment is to write a news article on the story of the conflict between Beowulf and Grendel. But one of the criteria is "the story reports facts not opinions." And another one of the criteria is "theme of the Anglo Saxon poem - triumph of good

    asked by Lucy
  51. College Algebra

    Part 1: Suppose that the number of new homes built, H, in a city over a period of time, t, is graphed on a rectangular coordinate system where time is on the horizontal axis. Suppose that the number of homes built can be modeled by an exponential function,

    asked by Vision/Help!
  52. phyiscal science

    I have to choose one as the greatest of the 4 forces. gravity - weakest weak force - no so it would have to be strong force or electromagnetic force

    asked by liz
  53. physical science

    is this correct or incorrect nonmetal are elements that tend to gain electrons in chemical reactions.

    asked by liz
  54. Algebra

    Factor 5x^2-13x-6 I got (5x-3)(x-2) as the answer, but I know that is wrong. Can someone please explain this to me? Thank-you.

    asked by Fanny
  55. physical science

    which one is responsible for holding an atom together strong force weak force electromagnetic gravity I answered both weak force and strong force

    asked by liz
  56. Science

    you are a patent agent, an inventor comes to you claiming he has invented a self-powered engine that requires no fuel to run. will you agree to patent this invention? why or why not? use the first law of thermodynamics. can anyone help me out with this?

    asked by Michelle
  57. physical science

    how is an electron related to atomic mass how is an isoptope related to mass number

    asked by liz
  58. Geography

    I need opinions Okay, what do you think is the major factor for population distribution. (where people live in our world) 1 Physical Features 2. Agriculture 3 Fresh Water/rainfall 4 Climate 5 Available Power 6 acess to other communities 7 history I'm

    asked by Dawn
  59. Chemistry

    Help needed for writing up a balance chemical equation for an acid/base titration: for an extended experimental experiment we tested the total acid content of orange juice, then had to write the balanced chemical equation for the experiment to do further

    asked by Lauren
  60. Business

    why should managers primarily follow affirmative action guidelines

    asked by Jen
  61. science

    rutherford = an atom is mostly empty space with a dense positively charged nucleus in the center do you agree

    asked by sam
  62. Physics

    A 3700 kg statue is placed on top of a cylindrical concrete (Y = 2.3 1010 N/m2) stand. The stand has a cross-sectional area of 7.2 10-2 m2 and a height of 2.0 m. By how much does the statue compress the stand?

    asked by fred
  63. science

    I have read over 20 sites and I still cant figure this one out - in an atom electrons are located in energy levels that are a certain distance from the nucleus.

    asked by sam
  64. physical science

    a family of elements is the same as a group. The word groud needs to be replaced with the correct word????

    asked by liz
  65. science

    how does the human reprodutive system work?

    asked by freddy
  66. Japanese - translate & construct sentences

    I need help translating the following into japanese. -Clan of the Shadow. -Village of the Shadow. -Hidden Village of the Shadow. -Country of the Shadow. -Land of the Shadow. -Second Royal Family of the Village of the Shadow This is what I have so far:

    asked by Joshua
  67. human risk assessment

    What are the advantages and disadvantages of animal studies and epidemiological studies for establishing dose-response relationships?

    asked by Thano
  68. physical science

    a family of elements is the same as a group. is this or should it be a family of elements is the same as a column

    asked by liz
  69. Algebra

    I need a function rule for the following: X Y -2 -2 0 1 1 3

    asked by Mary
  70. physical science

    is this correct if not we are to replace the word families elements that have the properties of both metals and non-metals are called families I think it is metaloids?

    asked by liz
  71. science(chem)

    How do I analyze a HPLC result? The lab tech injected the sample into the machine and I have the result paper for the sample injected which was caraway oil. However I'm not sure what to do with this now. It was recorded in volts per minutes. Thanks

    asked by ~christina~
  72. Algebra 2

    f(x)=3x+1 g(x)= -4 h(x)=5x m(x)=x^2 What is m(x)/ h(x) ? What is f ^-1(x) ? What is h(h(x)) ?

    asked by Allisen
  73. physical science

    we have a whole list and I am confused and can someone help me with the first 2 as a reference to use. substance O substance O2 **these are both separate lines** name = under the rest we check appropriate box element compound symbol formula atom molecule

    asked by liz
  74. physical science

    which one opf the 4 forces opposes the electromagnetic force in the nucleus of an atom: strong force weak force gravity I thought it was stong force

    asked by liz
  75. physical science

    the greatest of the 4 forces would be strong force not electromagnetic force - I am a little confused from the reading

    asked by liz
  76. physical science

    Most easily observed in the behavior of large objects electromagnetic strong force gravity weak force I answered electromagnetic

    asked by liz
  77. Physics

    I have this formula z=1/x (which is the formula for conductance) My x values are: 98.3 ohms, 967 ohms, and 545 ohms. What would my "z" values be? I know the units would be siemens.

    asked by Soly
  78. 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!

    asked by Matt
  79. Algebra 2(quadratic)

    Use the value of the discriminant to determine the number and type of roots for the equation: (x^2+20=12x-16) 1 real, irrational 2 real, rational no real 1 real, rational

    asked by Chels
  80. History

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

    asked by Matt
  81. 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

    asked by Christina
  82. BUSINESS MATH

    1.Describe a possible financial application for an Excell spreadsheet. Make it an application that a student has not listed before. Include at least two tricks or tips for using Excell, not previously listed by another student.

    asked by NELSON J
  83. Physics

    How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?

    asked by Onox
  84. Pigskin Geography

    What is the recreational facility in Little Rock, AR or Charleston, WV? I can't find it anywhere!

    asked by Anonymous
  85. AP Biology

    Why should we test water with Benedict's solution?

    asked by Coral
  86. science

    do you know where I can find an actual diagram/drawing of a structure of an atom I need to make one for helium

    asked by sam
  87. physical science

    the question ask if charcoal has a luster - and is maleable. I know it is not maleable - but does it have a luster - I am guessing no.

    asked by liz
  88. physical science

    is a property of metals luster

    asked by liz
  89. phyiscal science

    can you help me with the first two - I have a chart of 20. Substance O - check any appropriate element - compound - symbol-formula - atom - molecule Substance O2 - check any appropriate element - compund - symbol-formula- atom - molecule

    asked by liz
  90. writing a bussines letter

    Your local bank made a mistake on your printed checks. Additionally, the bank charged you for the checks, even though the order was supposed to be complimentary for customers opening a new account. How would you draft a letter that allows your irritation

    asked by Anonymous
  91. Maths

    What's the answer for x^2-2x+3 and 2x^2+9x+4?

    asked by Justin
  92. physical science

    O = oxygen o2 = ??? it ask for us to name the substance.

    asked by liz
  93. physical science

    is AL ( aluminium) an element compound formula atom molecule

    asked by liz
  94. Algebra 2

    How do I find the domain and range of a function?

    asked by Allisen
  95. physical science

    What is the substance name for NH3

    asked by liz
  96. physical science

    How is an isotope and a nuetron related? how is an atomic number and a proton realted?

    asked by liz
  97. science

    How does one explain the raltionship between quark and subatomic particle

    asked by sam
  98. French

    My text says C'est cette porte, l¨¤. = C'est la porte, l¨¤. I don't really get why does it have to change. Porte is feminine, does it also apply to masculin nouns?

    asked by Miche