Questions Asked on
December 4, 2007

  1. chemistry

    Why is the formal charge on B in BF4- is 1?

    asked by Km
  2. physics

    A .100 kg meter stick is supported at its 40.0 cm mark by a string attached to the ceiling. A .700 kg mass hangs vertically from the 5.00 cm mark. A mass, m, is attached somewhere on the meter stick to keep it horizontal and in rotational and translational

    asked by Anonymous
  3. physics

    A uniform disk with a mass of 800 g and radius 17.0 cm is rotating on frictionless bearings with an rotational speed of 18.0 Hz when Jill drops a 130 g clod of clay on a point 7.10 cm from the center of the disk, where it sticks. What is the new rotational

    asked by stephanie
  4. chem

    how do you write the equilibrium expression for: C3H8 + SO2->

    asked by madison
  5. Math

    Les Fleurs, a boutique in Paris, France, had the following accounts in its accounting records at December 31, 20X2 (amounts in Euros, denoted as "E") Purchases………………... E250,000 Freight In……………… E8,000 Sales discounts………….

    asked by Vision/ Help
  6. math

    a rectangular garden 30 m by 40 m has two paths of equal width crossing through it as shown. Find the width of each path if the total area covered by the path is 325 M^2 (m squared) help

    asked by sam
  7. Math

    Find the area between y=3sinx and y=3cosx over the interval [0,pi].

    asked by Ben
  8. Is this how you derive the formula for arc length?

    For a smal change in x, dx: ds² = dx² + dy² ds = sqrt [(dx² + dy²)] s = INTEGRAL of sqrt [(dx² + dy²)] s = INTEGRAL of sqrt [(dx² + dy² * dx²/dx²)] s = INTEGRAL of sqrt[(1 + dy² * 1/dx²)] dx s = INTEGRAL of sqrt[(1 + (dy/dx)²)] dx

    asked by Rob
  9. AP Biology

    In cattle, the gene pair for red (RR) or white (WW) coat color shows an absence of dominance. Heterozygotes (RW) have a roan coat. Outline a breeding procedure to establish apure breeding herd of red cattle from a roan bull and white cow. A cattle breed

    asked by bobby
  10. physics

    A diver can change his rotational inertia by drawing his arms and legs close to his body in the tuck position. After he leaves the diving board (with some unknown angular velocity), he pulls himself into a ball as closely as possible and makes 2.16

    asked by stephanie
  11. Calculus

    A section of highway connecting two hillsides with grades of 6% and 4% is to be build between two points that are separated by a horizontal distance of 2000 feet. At the point where the two hillsides come together, there is a 50-foot difference in

    asked by Jon
  12. Indicators and Solutions

    Which indicator is used to check for the presence or absence of simple sugars? What indcates the presence of simple sugars in a solution? What indicator is used to check for the presence of starch? What indicates the presence of starch in a solution?

    asked by Mia
  13. english

    can any one help me by getting me some info on princess diana her life story or a biography or something but not he wikipedia because i have that already so plz help me ty

    asked by stacy
  14. math

    A full grown oak tree loses an average of about 7 tons of water through its leaves per day. About how many tons of water is that per year? I need an exact answer using partial products. Can anyone please hlep?

    asked by Becky
  15. please help me with my engineering homework

    what are the advantages of having an optical biopsy?

    asked by shylo
  16. math

    what am I? I am a polygon and I have two right angles and one pair of parallel sides. Is it a rhombus? Please help.

    asked by Rachel
  17. science

    when on a roller coster at which point is the kinetic energy and potential energy located????

    asked by taylor
  18. Earth Science

    Hello, I need help with this question: When and why did eruptions occur with the volcanoes Pinatubo, Tambora, and mount toba. thanks

    asked by chris
  19. earth science

    Hello another question: why is yellowstone national park thought to be significant relative to volcanoes. thanks

    asked by chris
  20. Algebra

    I need the equation for this problem: I sold some books for $10 total on the Internet. If I had sold them at my garage sale I only would have received $6 or $4 less. What percentage did I gain by selling on the Internet?

    asked by Gandma Beni
  21. trigonometry

    find soultuion in degree, use exact value 1. cos2xcosx+sin2xsinx=-1/2

    asked by pam
  22. physics

    What are vector components?

    asked by Soly
  23. math

    well, if its not a rhombus or a trapezoid then.... what has two right angles and one pair of parallel sides?

    asked by Rachel
  24. physics

    if the pulling force P is 150 N and the crate dosent move, what is the magnitude of f

    asked by Anonymous
  25. Psychology

    Are IQ tests an acurate reflection of intelligence? Are there social factors that influence the results of IQ tests?

    asked by Christian
  26. factoring

    Factor x3 + 9x2 + 27x + 27 Factor 8a3 + 60a2b + 150 ab2+ 125b3 I tried doing them, but I just don't get how; perfect squares didn't work and neither did decomposition... someone please help me.

    asked by Chujung
  27. Science

    why is the process of mitosis and meiosis important to a living organism? when would an organism need to undergo the process of mitosis?meiosis? what would happen if meiosis did not occur? any links or ideas?

    asked by Michelle
  28. science

    what are 2 types of weathering?

    asked by dylan
  29. Mitochondria

    Assume Cell 1 produces 1.0 x 105 ATP molecules while Cell 2 produces 1.0 x 108 ATP molecules. Which mitochondria, A or B, has the hardware to produce 1.0 x 108 ATP molecules? What told you this?

    asked by May
  30. Science

    Why are waves called perpetuaing waves

    asked by Jordyn Henning
  31. HUM 130

    Why do you suppose Guatama's leaving his wealth and family led to a religion that is the 4th largest in the world today? What exactly was the "spark" that caused the religion to spread like wildfire?

    asked by dawn
  32. math

    I don't understand how to write the formulas for unit analysis. I can do the problems, but the explanation of the formulas in my book doesn't make sense with the problems I am doing. For instance, this one: Find the unit rate: $2 for 5 cans of vegetables.

    asked by Lydia
  33. AP Biology

    Hi you guys I am having trouble with the cell communication chapter so I would really appreaciate if someone could help out with this question "What could happen to the target cells in an animal that lack receptors for local regulators?" I know that some

    asked by Claudia
  34. Math

    To determine if 3417 is prime, you would have to try dividing 3417 by every whole number less than 3416. True or false and how did you get the answer

    asked by Beth
  35. AP World History

    I have to do a project that is like a ABC book for the Islamic religion. Like A is for apple, i just have to do them in islamic terms. I have everything but X and I have been all over the internet with no luck!! If you can help me out, it could be a person

    asked by Taylor
  36. geography

    does anyone know what the three parts of climate are? i know two are precipitation and temperature. what is the third part??

    asked by Alyssa
  37. civics

    explain two weaknesses of the Articles of Confederation

    asked by erika
  38. algebra

    Which one is greater 5/6 or 8/9? I think it's 8/9.

    asked by Tabby
  39. civics

    why was the ratification by New York and Virginia critical to the success of the Constitution

    asked by erika
  40. algebra

    a and b are both the lengths of the legs of a right triangle, c is the length of the hypotenuse. Find the missing length if b=24 and c=25. I don't know how to do this.

    asked by Tabby
  41. English

    In Great Expectations by Charles Dickens, Chapter 16-17, in what ways does Pip seem immature?

    asked by Anonymous
  42. science

    What type of electromagnetic radiation does a flame emit?

    asked by Lorlexrik
  43. science

    Why is visible light arranged into colors in order: red, orange, yellow, gree, blue, indigo, and violet?

    asked by janna
  44. science

    How could a thermogram taken of a home be helpful to the homeowner?

    asked by billy
  45. trigonometry

    How do you work these out? sec u- 1 / 1-cos u = sec u sec x-cos x= sin x tan x 1/sin x - 1/csc x= csc x - sin x

    asked by jd
  46. Social Studies

    What are the checks and balances? (In our government)

    asked by Ariana
  47. Religon

    What is the difference between the way Buddhists understand a person who has realized their buddha-hood (बुद्ध) and the way Western religions experience the relationship between a Divine Being and the founders of religions? In other words, why

    asked by Anonymous
  48. Physics, almost have it!

    In a physics lab experiment, a student immersed 205 one-cent coins (each having a mass of 3.00 g *.003kg) in boiling water. After they reached thermal equilibrium, she quickly fished them out and dropped them into 0.244 kg of water at 20.0 C in an

    asked by Tia
  49. religion

    Was there only one Buddha? This seems like a weird question. the first step is to decide what Buddha means and whether or not it is a name.

    asked by Anonymous
  50. science

    how does a water that you poured into a filter represent the concept of turbidity in nature?

    asked by Anonymous
  51. Physics???

    When the air temperature is below 0 C, the water at the surface of a lake freezes to form a sheet of ice. If the upper surface of an ice sheet 24.2 cm thick is at -10.7 C and the bottom surface is at 0.00 C, calculate the time it will take to add 1.80 mm

    asked by Chels
  52. language arts

    use a comma after introducttry elements in a sentence...can you give me an example if that kind of sentence??

    asked by brittany
  53. Trigonometry

    [sinxcosx/(1+cosx(]-[sinx/(1-cosx)]= -(cotxcosx+cscx)

    asked by Christie
  54. Physics

    A youngster shoots a bottle cap up a 15.0° inclined board at 1.92 m/s. The cap slides in a straight line, slowing to 0.95 m/s after traveling some distance. If the coefficient of kinetic friction is 0.35, find that distance. Can someone please show me the

    asked by Lindsay
  55. Albebra

    c squared-4c-12=0 we have to solve each equation by completing the square.

    asked by Ron
  56. science

    If radio waves are not compressional waves,like sund waves, what is their role in enabling us to hear music?

    asked by Juliann
  57. Social Studies

    I need help on these problems: 1.This water rising device cosists a simple leaver. 2.Which Egyptain word decribes the word Red Land, the desert 3.This Egyptaion god is represented by the Niles croc. 4.Blank is one of the world's oldest civilation and Busch

    asked by Miley
  58. Science

    why is the process of mitosis and meiosis important to a living organism? when would an organism need to undergo the process of mitosis?meiosis? what would happen if meiosis did not occur? any links or ideas?

    asked by Michelle
  59. math

    what pattern do you see in this list

    asked by vamsi
  60. math

    what is the solution for the logarithmic equation log2(x2+2x-44)=2? x2=x squared

    asked by sophea
  61. AP US History Essay

    Explain why Britain finally decided against intervention on behalf of the Confederacy. In what ways was Britain helpful to the South anyway? I got the first part of the essay question, but i am having difficulty with the second. Any help would be

    asked by Amanda
  62. trig

    how do you solve this problem? 1+sinØ/cosØ +cosØ/1+sinØ = 2secØ and cosß- cosß/1-tanß = sinßcosß/sinß-cosß

    asked by jd
  63. world history

    During caesar's rule, was italy affected?..and was italy even known around that time, like did they trade alot with other countries in the roman empire

    asked by gabs
  64. algebra

    if x+20-x=0 how do i find what x is

    asked by lee
  65. Physics

    A 5.70 kg block located on a horizontal floor is pulled by a cord that exerts a force F = 10.4 N at an angle theta = 27.5° above the horizontal. The coefficient of kinetic friction between the block and the floor is 0.10. What is the speed of the block

    asked by Lindsay
  66. Algebra

    I'm having trouble tunring 5 3/11 into a decimal. Can you explain it to me?

    asked by Cody
  67. french

    If i want to ask what clothing you are wearing today, is it Quels vetements or Qu'est-ce vetements tu portes or portes-tu aujourd'hui?

    asked by Jim
  68. Math

    Can somone explain what this means For a paper on philosophy of mathematics? Formalism holds that mathematical statements may be thought of as statements about the consequences of certain string manipulation rules.

    asked by Sharar
  69. african literature

    what is the meaning of the poem "africa" by david diop???

    asked by klar maesen
  70. economics

    What does internalizing an externality mean?

    asked by Tabby
  71. French

    so, how do u really say this quote in french? "You are in love when suddenly reality is in your dreams, and you cannot sleep anymore." help?

    asked by Ellen
  72. Physics-Rutherford

    Can you please give me a brief explanation of Rutherfords experiment?

    asked by Soly
  73. physics

    Two window washers, Bob and Joe, are on a 3 m long, 345 N scaffold supported by two cables attached to its ends. Bob, who weighs 750 N stands 1 m from the left end, as shown in Figure 8.37. Two meters from the left end is the 500 N washing equipment. Joe

    asked by Anonymous
  74. portugese

    Adeus Ano Veho Feliz Ano Novo Que Tudo se relize No Ano Que Vai Nascer Muito Dinhero no bolso Saude pra dar e vender can some plz translate this portugese song thanks

    asked by Kijhauna
  75. african literature

    what is the symbolic item will represent the poem "africa" by david diop???

    asked by klar maesen
  76. Accounting

    Can anyone give me a list of contra accounts and the accounts that they are contra counts too

    asked by Alex
  77. pre-calc

    How do you find the asymptotes in general?? For example... f(x)=(1/2)^x, how would I find that?

    asked by Anonymous
  78. PHysics-almost complete!

    In a physics lab experiment, a student immersed 205 one-cent coins (each having a mass of 3.00 g *.003kg) in boiling water. After they reached thermal equilibrium, she quickly fished them out and dropped them into 0.244 kg of water at 20.0 C in an

    asked by Tia
  79. Atoms

    You discovered a new atom! Wow, everyone at your lab is impressed!! Some are saying you may be nominated for the Nobel Prize in Medicine!!! If this is going to happen, you have to find out as much about the atom as you can, and you don’t have long to do

    asked by Gessica
  80. Mathematics

    Differentiate ln(x)-1 I have d/dx lnx-1 = d/dx(ln x)- d/dx1 = d/dx(ln x) = 1/x Could you tell me if this is right or not? If not, please suggest the right working out.

    asked by xX_Supaman_Xx
  81. Hum 130

    How has modern civilzation impacted the spirtual lives of the indigenons people

    asked by anaya
  82. Ions, Ions

    ION // H+ IONS OUTSIDE THE CELL // 2,000 IONS INSIDE THE CELL // 10 Will this ion enter or leave the cell? Explain why.

    asked by Angela
  83. Calculus

    Find the volume of the solid obtained by rotating the region enclosed by the graphs of y=15-x, y=3x+11 and x=0 about the y-axis.

    asked by Al
  84. history

    what is a group of people captured and taken to Babylon by the Chaldeans?

    asked by penelope
  85. Psychology

    What is "moral education" ?

    asked by Anonymous
  86. Another Ion Question

    ION // F- IONS OUTSIDE CELL // 19,000 IONS INSIDE CELL // 20,000 Why would this ion leave the cell? Explain please.

    asked by Angela
  87. Trigonometry

    x square root of 2 + 3x =4 all over square root of 2

    asked by Anonymous
  88. math

    Find the perimeterof a decagon if each of its sides are 5.9 yards long?

    asked by madison
  89. rec and leisure

    does anyone have any ideas of a class interaction i could use for a presentation on youth recreation.

    asked by DAVE MCDONALD
  90. Trig

    x[sqrt of 2] + 3x = 4

    asked by Anonymous
  91. math

    wat is 45x320?

    asked by rick
  92. analytical chemistry

    What is the pH of a solution formed by mixing 14.35 mL of 0.200 F HCl with 0.322 g of Na3PO4, followed by dilution to 500.00 mL?

    asked by Jonny
  93. analytical chemistry

    What is the pH at the equivalence point in a titration between 0.4450 F NH3 and 0.1520 F HCl?

    asked by Jonny
  94. please

    tell sme the answers to pig skin geogphy right now please right now please well i need them poisted

    asked by gel
  95. maths

    given function G(x)=1/3(x-2)^2-3 2

    asked by cecelia
  96. maths

    Given g(x)= 1/3(x-2)^2-3 2

    asked by cecelia
  97. Quadratic equation..

    Hi Can anyone tell me if this is correct X Sq - 4x - 16 = 0 using X = -b + Sqrt b sqrd - 4ac / 2a a =1, b = -4 , C = -16 x = -(-4) Sqrt (-4)sq - 4 x 1 x -16 / 2 x 1 = 4 + - Sqrt 80 = 9 + or minus 8.944/2 + = 4 + 8.944 = 12.944/2 = 6.472 - = 4 - 8.944 = -

    asked by Leo
  98. Physics help please

    In a physics lab experiment, a student immersed 205 one-cent coins (each having a mass of 3.00 g *.003kg) in boiling water. After they reached thermal equilibrium, she quickly fished them out and dropped them into 0.244 kg of water at 20.0 C in an

    asked by Tia
  99. Maths

    If we have p^2+p^3 how can it be simplified ?

    asked by ASD
  100. Science

    I am confused about diffusion in liquids can u explain it plz?

    asked by Georgia
  101. physics

    A figure skater is spinning at a rate of 1.7 rev/s with her arms outstretched. She then draws her arms in to her chest, reducing her rotational inertia to 62% of its original value. What is her new rate of rotation?

    asked by stephanie
  102. Digital Logic

    The input voltage to a certain op-amp inverting amplifier is 10 mV, and the output is 2 V. What is the closed-loop voltage gain?

    asked by Matthew
  103. Digital Logic

    How many flip-flops, in a shift register, would be required to hold an initial count of 16?

    asked by Matthew
  104. english

    how is the concept of empathy illustrated and developed in Raymond Carver's "cathedral"

    asked by kim
  105. MaTh WoRd PrObLeM

    Many years ago, a cruise liner sank in the middle of the Pacific Ocean. The survivors luckily landed on a remote desert island. There was enough food for the 220 people to eat once per day; this would make the food last for three weeks. Six days later a

    asked by Anonymous
  106. Chemistry

    Can someone tell me why N2^2+ is a diamagnetic molecule based on MO theory and diagrams? I get a bond order of 2, which is paramagnetic.

    asked by Andrew
  107. Maths

    How do you work out the IQR off of a scatter graph? Thanks !

    asked by Jess
  108. chemistry

    Are 0,1,2,3 values of the orbital quantum number of a 3p electron correct? or is the values 0

    asked by Km
  109. science

    similarities+differences between a light microscope and a electron microscope?

    asked by ash
  110. economics

    What changes if any to the current condition of these tools would you make at the next meeting of the Federal Reserve Explain why and the benefitsdrawbacks of this strategy

    asked by marty
  111. science

    HELP! (UNGERT)due next week tue 11 dec :what the similarities+differences between a light microscope and a electron microscope?

    asked by ash