Questions Asked on
January 27, 2008

  1. biochemistry with more info that was needed

    Calculate the weight of the buffers you will use to make the buffers for Part A for all the buffer possibilities listed under procedures in Part A, step 1. In other words, how many grams do you need to make 100 mL of a 0.1 M buffer? Buffer pKa1 pKa2 pKa3

    asked by stew
  2. AP Physics

    A uniform spherical shell of mass M and radius R rotates about a vertical axiss on frictionless bearings. A massless cord passes around the equator of the shell, over a pulley of rotational inertia I and radius r, and is attached to a small object mass m.

    asked by Kristen
  3. chemistry

    An aspirin tablet weighing 0.502 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of

    asked by John
  4. AP Physics

    A record turntable is rotating at 33 and 1/3 rev/min. A watermelon seed is on the turntable 7.5 from the axis of rotation Calculate the acceleration of the seed assuming that it does not slip? Suppose that the turntable achieves its angular speed by

    asked by Kristen
  5. AP physics

    A uniform spherical shell of mass M and radius R rotates about a vertical axiss on frictionless bearings. A massless cord passes around the equator of the shell, over a pulley of rotational inertia I and radius r, and is attached to a small object mass m.

    asked by Kristen
  6. physics

    (a) How many excess electrons must be distributed uniformly within the volume of an isolated plastic sphere 30.0 cm in diameter to produce an electric field of 1150 N/C just outside the surface of the sphere? (b) what is the electric field at a point 10.0

    asked by J
  7. Physics

    A bird is flying with a speed of 18.0 m/s over water when it accidently drops a 2.00 kg fish. If the altitude of the bird is 5.40 m and the friction is disreguarded,what is the speed of the fish when it hits the water?

    asked by Cassidy
  8. physics

    During a violent electric storm, a car is struck by a falling high-voltage wire that puts an excess charge of 850 uC on the metal car. (a) how much of this charge is on the inner surface of the car? (b) How much is on the outer surface? ok...I didn't think

    asked by J
  9. Chemistry

    A 15.0g sample of liquid ethanol, C2H5OH, absorbs 5.13x10^3 J of heat at its normal boiling point, 78.0C. The molar enthalpy of vaporization of ethanol is 39.3kJ/mol. (a) What volume of ethanol vapor is produced? The voume is measured at 78.0C and 1.00atm

    asked by David
  10. AP Physics

    A flywheel turns through 46 rev as it slows from an angular speed of 3.1 rad/s to a stop. Assuming a constant angular acceleration, find the time for it to come to rest? What is its angular acceleration (in rad/s^2) ? How much time is required for it to

    asked by ed
  11. Physics

    A rock is thrown vertically upward from ground level at time t=0. At time t=1.3s it passes the top of the tall tower, and 1.1s later it reaches its maximum height. What is the height of the tower? can someone please get me started....tnx in advance :)

    asked by Mary
  12. geometry

    "An angle has a measure three times that of its complement. What is the measure of the angle?" Complementary angles add up to 90 degrees. If x is the complement and 3x is the angle, and you added them to have 4x, then you'd have 4x=90, right? That would

    asked by Bee
  13. apchem

    A 15.0g sample of liquid ethanol, C2H5OH, absorbs 5.13x10^3 J of heat at its normal boiling point, 78.0C. The molar enthalpy of vaporization of ethanol is 39.3kJ/mol. (a) What volume of ethanol vapor is produced? The voume is measured at 78.0C and 1.00atm

    asked by alk
  14. 3rd grade english

    wat is a noun

    asked by Dakota
  15. us history

    what factors finally turn the tide for womens suffrage? On what grounds did people resist womens suffrage? what is the significance of the phrase"the perfect thirty-sixth"?

    asked by tt
  16. statistics

    The following frequency distribution presents a set of exam scores for a class of N= 20 students. X F CF % C% 90-99 4 20 20 100 80-89 7 16 35 80 70-79 4 9 20 45 60-69 3 5 15 25 50-89 2 2 10 10 a)Using interpolation find the 30th percentile. The answer I

    asked by Lezlie
  17. AP physics

    do you guys have an someone that good with advanced physics, because i have a few problems that i am not sure how to do and its for my AP physics class, and I wasn't sure if you had someone on board now that could help thanks

    asked by Kristen
  18. biology: the study of life

    2. what is meant by the statement "living things do not exist in isolation"? TRUE/FALSE 3.people study biology only if they are planning to become biologists. 4. by studying biology you can better appreciate the great diversity of species on earth and the

    asked by natalie
  19. physics

    A 2.8 kg air mattress is 2 m long, .5 m wide, & .1 m thick. What mass can it support in water before sinking?

    asked by Nico
  20. biochemistry

    How many grams do you need to make 100 mL of a 0.1 M buffer? I got .01 grams. Is that right? If not, will you show me the right answer and how you got it? Thanks.

    asked by Anonymous
  21. physics

    Define STPD, ATPD, BTPS and list the values. I'm in college and our books haven't came in from the bookstore. I don't understand how the prof. is still making us do this HW. my younger brother told me I should try to get help from this site since it helped

    asked by jamie
  22. chemistry

    An unknown was prepared with the concentration of 0.000630 M. A Beer's Law plot was prepared using the absorbance values from standard solutions of ASA and a line drawn through all the points passed through the origin with a slope of 1550.2 M–1. The

    asked by john
  23. math

    1)y=x²-3x+2 2)y=8x-16/x-3 A)Sketch both on axes B)Calculate coordinate of points of intersection I have drawn both on axes. I am having trouble with B). I know you have to do y=y. So far i have done this; x²-3x+2=8x-16/x-3 (x-3)(x²-3x+2)=8x-16

    asked by Anonymous
  24. physics(gas laws)

    Got a question 3. Given 325 ml of saturated gas at 760 mmHg and 25°C, what would be its volume if dry at the same pressure and temperature? I got confused when I read 'if dry' Does that mean I have to subtract something out of 760mmHg? And would I used

    asked by abby
  25. PHysics...last one :)

    hello sorry once again...this will be my last question...i promise...but here is the question.... A red car and a green car, identical except for the color, move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is

    asked by Mary
  26. maths

    1)y=x²-3x+2 2)y=8x-16/x-3 A)Sketch both on axes B)Calculate coordinate of points of intersection I have drawn both on axes. I am having trouble with B). I know you have to do y=y.

    asked by Anonymous
  27. world history

    What measures did wartime governments take to control (a)national economies (b) public opinion?

    asked by Sally Ann
  28. algebra

    Emily wants to buy turquoise stones on her trip to New MExico to give to at least 4 of her friends. The gift shop sells stones for either $4 or $6 per stone. Emily has no more than $30. What are the system of inequalities so I could be able to graph them?

    asked by aj
  29. physics

    One last question: If a 12lb. block is slowly tilted from horizontal when the plank reaches 30 degrees the block begins to slide. To find the coefficient of the static friction you take the tangent form of 30 degrees? To find the friction force you

    asked by Charles
  30. English

    The Odyssey By Homer -- Book 11 What lesson does Odysseus learn about himself? How has it strengthened his resolve to return to Ithaka?

    asked by Mark
  31. AP physics

    On Block has a mass M=500 g, the other has mass m=460 g, they are hooked to a string and is on a pulley will one mass on either side, the pulley, which is mounted in horizontal frictionless bearings, has a radius of 5 cm. When released from rest, the

    asked by Kristen
  32. physics

    starting from rest, a disk rotates about its central axis with constant angular acceleration. In 4 seconds, it has rotated 50 rad. What was the angualr acceleration during this time? What is the instantaneous angular velocity of the disk at the end of the

    asked by Kristen
  33. Data managment math

    1: What is the probability that at least two of the 12 councillors elected in the next municipal election will have the same birthdays on the same day? 2:Hoyda has 15 percent of the car market. If a random sample of 20 auto mobiles is conducted what is the

    asked by Samir
  34. world history

    how did the peace treaties both follow and violate Wilson principle of self-determination?

    asked by Anna
  35. Science

    What is a good science project to do? I am in 8th grade and am studying earth science. I need to present the project in front of class. Im really nervouse.

    asked by Katy
  36. chemistry

    An unknown was prepared with the concentration of 0.000630 M. A Beer's Law plot was prepared using the absorbance values from standard solutions of ASA and a line drawn through all the points passed through the origin with a slope of 1550.2 M–1. The

    asked by Michael
  37. Life Science

    I tried looking and can't find or understand where the following answer are. Please help me, I feel like I'm going crazy. I’m not sure about the answers I wrote but if someone could correct them and help me out with the ones I didn’t get.

    asked by Bretagne
  38. Rounding

    Round to two decimal places a. 3.1459 b. 6.003 c. 42 d. 6.0233 x 10^23 e. 14.456 + 3.87 f. 9.9999995 - 0.0108 g. 67.3 x 6.667 h. 4.93 / 3.946 check my answers please a. 3.15 b. 6.00 c. 42 d. 6.02 x 10^23 e. 18.33 f. 9.99 g. 448.69 h. 1.25

    asked by Britt
  39. Significant Figures

    Report the following to two significant figures a. 3.1459 b. 6.003 c. 42 d. 6.0233 x 10^23 e. 14.456 + 3.87 f. 9.9999995 - 0.0108 g. 67.3 x 6.667 h. 4.93 / 3.946

    asked by Britt
  40. biology- sex linked diseases, punnet sqares

    [IMG]ht tp ://i25 .tinypic. com/w7nyc. jpg[/IMG] i have an idea of how to do the questions above but can someone do them to so i can clarify?

    asked by Jan
  41. english

    i am not very good at analyzing/interpreting poems and figuring out their meaning. what are some tips/strategies/methods that i could use to better my poetry understandings? and please help me to interpret this here poem: Starlight Philip Levine My father

    asked by todi
  42. psychology

    1)What is your opinion of the Evolutionary theory of personality? How might you see yourself--traits of yourself operating for an evolutionary purpose? I am not quite understanding the theory of evolutionary theory of personality. Can someone please

    asked by Phylis
  43. chemistry

    the atomic number of oxygen is 8. How many protons, neutrons and electrons are in an oxygen icon with a charge of -2 and a mass number of 17?

    asked by cynthia
  44. Physics

    A volleyball is spiked downward at a 55 degree angle gom the vertical net.If the ball is traveling at 22m/s, what are its horizontal and vertical components?

    asked by Ash
  45. chemistry

    A 250 ml cylinder containing C2H4 at a pressure of 1.00 atm is connected by a valve to 950 ml cylinder containing PF3 at 2.50 atm pressure. Calculate the partial pressure (atm) of Pf3 when the valve is opened.

    asked by betty
  46. reading/ language arts

    hi... i need some similarities and differences between the movie and the book "the pearl"

    asked by Gracie
  47. Sci

    What are some Effects of Urbanization?

    asked by RENE'
  48. Chemistry

    For each of the compounds below, exlain why they do not have the same value for their standard heat of vaporization. 1. Propane and propanone 2. Propanone and 1-propanol

    asked by Allie
  49. world history

    who do most modern historians think was responsible for the war? Germany is this answer right.

    asked by Henrietta
  50. african literature

    can somebody help me...please........ interpret the way of life, culture and aspirations of african people from the literary piece that they produced.

    asked by klar maesen
  51. Physical Science

    What is the process called that could be used to sepate dissolved particles from the liquid in a solution

    asked by Kay
  52. Physics

    How do you use this equation? mgh+1/2mvh=mgh+1/2mv^2+Fd

    asked by Cassidy
  53. trig

    i vertex has no segment, 2 vertex have 1 segment , 3 vertex have 3 segments, 4 vertex have 6 segment , 5 vertex have 10 segments, how many segments are needed to connect 20 points?

    asked by maria
  54. social studies

    i need a historic place or person from 1860 and under

    asked by shienne
  55. Significant Figures

    Report the following to two significant figures a. 3.1459 b. 6.003 c. 42 d. 6.0233 x 10^23 e. 14.456 + 3.87 f. 9.9999995 - 0.0108 g. 67.3 x 6.667 h. 4.93 / 3.946 Can someone please check my answers a. 3.1 b. 6.0 c. 42 d. 6.0 x 10^23 e. 18 f. 10. g. 4.5 x

    asked by Britt
  56. algebra

    How do you work these problems? 8x-7=15+19x 7.6x-3.5x=-65.6 -7x-23=-25 1/3

    asked by Casey
  57. world history

    Why was Archuke Francis Ferdinand assassinated ?

    asked by Henrietta
  58. humanities

    The two different medieval accounts of creation in Genesis have caused scholars to believe that each was written at a different time by a different author. What are the two accounts? Where does one end and the other begin? How is creation described in

    asked by Tiffany
  59. Science

    If you need to speed up the rte at which your potatoes are cooking in boiling water, would it be better to turn up the heat or use a pressure cooker? why?

    asked by Karen
  60. Chemistry

    Calculate the entropy change of the universe (in J/K) when 43.4 g of ethanol vapor is condensed in a laboratory at 20.4 oC. Report your answer in scientific notation to three significant figures. If something is condensed, does that mean the system gaines

    asked by Student
  61. science

    [IMG]ht tp ://i25 .tinypic. com/w7nyc. jpg[/IMG] i have an idea of how to do the questions above but can someone do them to so i can clarify?

    asked by jan
  62. world histoy

    why did the United States declare war on Germany?

    asked by JoAnna
  63. African literature

    way of life of David Diop, in writing the literary piece Africa.

    asked by Rosette
  64. world history

    Describe the conditions in Europe after World War I.

    asked by Anna
  65. English

    How can I have a nice order of ideas in my paragraph so it doesn't ramble all over the place?

    asked by Karthik
  66. calc

    is the integral of 2x/(x^3-x) =-1/2ln(x+1)+1/2ln(x-1) I got this by doing this: (\=integral sign) 2\1/(x^2-1) 2\1/(x+1)(x-1) =A/(x+1)+B/(x-1) =Ax-A+Bx+B=1 Ax+Bx=0 B-A=1 B=1+A (1+A)x+Ax=0 x+Ax+Ax=0 1+AB=0 2A=-1 A=-1/2 B+1/2=1, B=1/2 etc.

    asked by sarah
  67. Poetry

    please read this poem and tell me how I can inprove it. Thanks! Where have you been I almost forgot you Its been a year or so Since I’ve seen you last Why did you have to come back I was trying to forget you And forget what you did Why bring back the bad

    asked by Madison
  68. us history

    In what ways did wilson support progressivism? In what ways did president Taft support the progressive agenda? Brefly describe theodore roosevelts progressive record what were some of the reform ideas at the turn of the century?

    asked by tt
  69. Algebra

    Suppose that a, b, and c are digits for which the number 708,16b,8c9 is a multiple of 99. Find a+b+c.

    asked by Ash
  70. Chemisry

    Use chemical principles of atomic structure and or chemical bonding to explain each of the following. 1. At 25.0 degrees C and 1atm, F2 is a gas, whereas I2 is a solid. 2. The melting point of NaF is 993 degrees C, whereas the melting point of CsCl is 645

    asked by Josh
  71. chemistry

    A 8.00 L cylinder containing SF6 at a pressure of 0.400 atm is connected by a valve to 91.0L cylinder containing 02 at 342 torr pressure. Both cylinders are at 8.00 C. Calculate the partial pressure (torr) of SF6 when the valve is opened and the

    asked by betty
  72. physics

    thank you for your help drwls

    asked by Charles
  73. math

    If in a problem it states 1.8 million how do I write that out in number form? Is it just 1.8 multiplied by a million to get 18,00,000

    asked by confused
  74. algebra

    Can you check these problems? 3x+13=96 x=6 -8-7x=-120 x=8

    asked by Anonymous
  75. Physical Science

    What method can be used to separate parts of a liquid mixture when the entire mixture can pass through a filter?

    asked by Kay
  76. Chem

    In thermodynaics, what is the relationship between enthalpy (H) and heat (q) - [at constant pressure]?

    asked by xX_Supaman_Xx
  77. world history

    Describe how each of the following nation was drawn in the assassinated of Ferdinand, Germany, Russia, France and Britain.

    asked by Monique
  78. algebra

    the lines described by y=(5a+3x) and y=-1/2x are perpendicular. what is the value of a?

    asked by nichole
  79. HUMANITIES

    WHY DO WE USE THE TERM CLASSICAL TO THE ANCIENT GREEK AND ROMAN CIVILIZATIONS?

    asked by z
  80. Chemistry - HELP IGCSE

    I have a chemistry exam tomorrow and I don't get the double bonding in covalent bonding I tried many websites , textbooks and other books and yet nothing worked Can someone please explain it clearely and in a simple way and please don't put any links for

    asked by AMY
  81. math

    solve the inequality: n^3-7n+6

    asked by devon
  82. Biology

    Can someone help me correct my answers and help me answer the questions not answered yet? Electron Tansport 1. Whats is the purpose of this pathway? 2. Where does it take place Mitochandria 3. What does this reaction need to proceed? Hydrogen,NADH and

    asked by Bretagne
  83. science

    Why is it not easy to observe individual chromosomes during the interphase?

    asked by Alicia
  84. Accounting

    For each fiscal year 2003, 2002, and 2001, is the amount of cash provided by operating activities more or less than the cash paid for dividends?

    asked by Adrian
  85. Chemistry

    If I am given a molecular hydrocarbon structure, how would I be able to tell how sp3 hybridized carbons it possesses? Like my current question asks How many sp3-hydridized carbon atoms does 11-cis-retinal possess?

    asked by Raj
  86. statistics

    -A set of seven scores has a mean of 10. If one of the scores is changed from X=15 to X=1, what will be the new value for the new mean? -A sample of n=8 scores has a mean of M=12. One new score is added to the same and the new mean is found to be M=13.

    asked by Joan
  87. Philosophy

    Describe christianity's impact on philosophy. Include the topic of principle christianized philosophical issues.

    asked by Angelina
  88. science

    the difference with growing alfalfa sprouts in soil and cotton buds and how come it grows faster and taller in the soil

    asked by kelli
  89. space

    does our solar system move in the milky way galaxy?

    asked by Isaac
  90. Math Analysis

    A quartic polynomial Q(x) with real coefficients has zeros 2+i and 3-2i, find the other two zeros.

    asked by Justin
  91. world history

    Who is Archuke Francis Fernidad? Who is Sergi Sazona? What happen at Passchendule?

    asked by Leo
  92. C Programming

    I am new to c programming and I cannot understand the teacher for the life of me. It becomes very difficult to learn this stuff even just by reading. I'd greatly appreciate any help... The program asks for the user to input the radius and height of a right

    asked by Brandon
  93. latin

    I have to write an analysis of Catullus 8th poem. Tips on how to write analysis please?

    asked by Anonymous
  94. Music

    So, I need zo post my question again... I have to write a report for school on the topic of film music. I want to show my class mates how different you feel when you see a movie scene with two different musics. So I was looking for two versions of a scene

    asked by Kelly
  95. science

    I did this experiment and I found these validity issues: they never specified if temperature to be measured in celcius or faren., they never mentioned that the buckets were to be the same, stirring until your arms get tired is not a good idea, but I need

    asked by peter
  96. science

    the lowest point of a tranverse wave is called.....

    asked by danielle
  97. algebra 2

    how do i do this? 64 negative cubed divided by 4 to the negative fifth. the answer is 1/256.

    asked by Miley
  98. world history

    describe conditions in Europe after World War I. the total of death, the cost of the war, homes,farm,factories, roads churches had been shelled into rubble.

    asked by Anna
  99. calc

    is the integral of the square root of x*ln(x) =(2/3 x^(3/2))(lnx-2/3) ?

    asked by sarah
  100. calc

    how would you do the integral of the sin(square root x) ? I just can't seem to get started

    asked by sarah
  101. environmental

    Climates modified by the oceans are called?

    asked by deanna
  102. Sociology

    Give an example of a human behavior that is considered deviant in one society but is not considered deviant in others. What are the factors that have contributed to this society's perspective of the deviant behavior? The human behavior I wanted to use is

    asked by RAY
  103. Algebra

    Digit d is randomly selected from the set {1, 2, 3, 4, 5, 6, 7, 8, 9}. Without replacement of d, another digit, e is selected. What is the probability that the two digit number de is a multiple of 3

    asked by Ash
  104. Physics

    A snail crawls up a bent piece of grass at 2cm/s. If the grass makes a 75 degree angle to the ground,what are the horizontal and vertical components of the snails velocity?

    asked by Ash
  105. Philosophy

    If you had to write a letter in the persona of an Eastern philosopher to one of his pupils, what would you write? That philosophers viewpoints concerning one of his philosophies needs to be included.

    asked by greatdanelola
  106. chemistry

    how to know clarify if the subtance is polar or nonpolar?

    asked by robert
  107. general

    need words that begin with X. thanks

    asked by angelina
  108. world history

    What impact did wartime failures have on Russia?

    asked by John
  109. biochemistry

    Is CAPS an acid or base? If it is an acid, what is its base? If it is a base, what is its acid? Also, is Tricine an acid or base? If it is an acid, what is its base? If it is a base, what is its acid? Thanks.

    asked by stew
  110. MATH

    64 negative cubed divided by 4 to the negative fifth. the answer is 1/256. Everytim I do this problem i keep getting 256. Can anyone help me?? PLEASE :)

    asked by Miley
  111. geometry

    Is a yield sign convex or concave?

    asked by shorty
  112. MATH

    I can't get the right answer on this question. The answer is 1/9. Question: (x^0 + 2y^0/x^0-2y^0)^-2 (Damon can you please explain this one to me)

    asked by Miley
  113. sci

    what some Benefits of Urbanization?

    asked by RENE'
  114. earth

    The short term condition in the troposphere are called?

    asked by deanna
  115. writing...

    hi what should i include in my first paragraph on a compare and contrast essay??? please help asap

    asked by Gabby
  116. critical Thinking

    Cntrolling Irrational Fears After 9/11 outline the premises and conclusion of each argument you find

    asked by Rhonda
  117. science

    I did this experiment and I found these validity issues: they never specified if temperature to be measured in celcius or faren., they never mentioned that the buckets were to be the same, stirring until your arms get tired is not a good idea, but I need

    asked by peter
  118. environmental

    A measure of the moisture content of the air is called?

    asked by deanna