Questions Asked in 2007

Most Popular Questions of 2007

  1. CHEM

    Help on part "c": The forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0g of luminol into a total volume of 75.0mL of H2O. a)What is the molarity of the stock solution of luminol? anwer I got: molarity of luminol

    asked by K on October 18, 2007
  2. chemistry

    Is NH4+ a polar or nonpolar bond?

    asked by Lin on November 30, 2007
  3. Physics

    A wheel with rotational inertia I is mounted on a fixed, fricitonless axle. The angular speed w of the wheel is inccreased from zero to w_f in a time interval T. 1: What is the average net torque on the wheel during the time interval, T? a) w_f/T b)w_f/T^2

    asked by Tammy on March 25, 2007
  4. chemistry

    how do i write a net ionic equation for Lead (II) Nitrate and Sodium Carbonate react to form Lead Carbonate and Sodium Nitrate??

    asked by caren on December 11, 2007
  5. CHEM

    What are the expected bond angles in ICl4+ (or) ICl_4^+ ?? I think that I have the stucture drawn correcty: I is the central atom with one lone pair above it. I then have the Cl's with 6dots around them & then bonded, singly, to the "I". Two "Cl's" go

    asked by K on November 26, 2007
  6. Physics;Help!!!!!!

    There is apparently no one online who can help with physics questions right now. Please check back later to see if a physics teacher has addressed your question. Multiple posts won't get faster answers. Thanks. =) The question is in the first question

    asked by Writeacher on June 7, 2007
  7. physics.

    A 20.0 kg cannon ball is fired from a cannnon with muzzle speed of 1000 m/s at an angle of 37.0 with the horizontal. A second ball is fired at an angle of 90.0. Use the conservation of energy principle to find a] the maximum height reached by each ball and

    asked by Jean on March 15, 2007
  8. EFFECTIVE WRITING

    WHAT ARE SOME ADVANTAGES FOR BOTH REVIWER AND WRITER-OF PEER REVIEWS? HOW WOULD YOU ENCOURAGE A RELUCTANT http://www.jiskha.com/search/search.cgi?query=HOW+WOULD+YOU+ENCOURAGE+A+RELUCTANT Idella, when you type in all-caps, two things happen: ~~it's harder

    asked by IDELLA JONES on April 13, 2007
  9. Senior Paper

    hey gurl IP address is your Internet Protocol address. Its kinda of like your street address but for your computer like how you put a return address on letters your IP address is recorded when visiting websites and posting things so the website operators

    asked by Haley on July 6, 2007
  10. Chemistry

    A colourless solution contains one type of ion. When one adds dilute HCl to it, a white precipitate initially forms. However, once more of the HCl solution is added, the precipitate dissolves. Explain why the ion is Pb2+ and not Al3+, Hg22+, Cu2+ nor Ag+.

    asked by Vic on September 3, 2007
  11. Physics

    A hollow, spherical shell with mass 2.00 kg rolls without slipping down a slope angled at 38.0 degrees. (a) Find the acceleration, the friction force, and the minimum coefficient of fricition needed to prevent slipping. You will find the moment of inertia

    asked by Karla on March 27, 2007
  12. Physics

    One end of a uniform meter stick is placed against a vertical wall. The other end is held by a lightweight cord that makes an angle, theta, with the stick. The coefficient of static friction between the end of the meter stick and the wall is 0.390. A. what

    asked by Karla on April 3, 2007
  13. Chemistry - solubility

    Arrange the following compounds in order of increasing solubility in water: * O2 * LiCl * Br2 * CH3OH Like dissolves like; that is, polar compounds usually are soluble in water and non-polar compounds are not soluble in water. From that description, make

    asked by Belinda on January 2, 2007
  14. CHEMISTRY

    HOW CAN U TELL IF HNO3 +KNO3 IS A BUFFER SOLUTION A buffer solution must contain a weak acid and its conjugate base OR a weak base and its conjugate acid. HNO3 is a strong base and KNO3 is the salt of a strong base (KOH) and a strong acid (HNO3);

    asked by CANDY on February 27, 2007
  15. Chemistry II

    C4H4 (g) + 2 H2 (g) --> C4H8 (g) Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C4H4 (-2341

    asked by Jayd on May 20, 2007
  16. CHEM

    Which statement best describes the polarity of SF_4Cl_2?? (or: SF4Cl2, if that helps more) 1. Always polar. 2. Always nonpolar. 3. Depending on the arrangement of outer atoms, this molecule could be polar or nonpolar. & how can you tell for certain??? I

    asked by K on November 26, 2007
  17. **CHEM**

    Arrange the following elements in order of decreasing atomic radius: Cs, Sb, S, Pb, Se *(list from largest to smallest...or..."the correct ranking cannot be determined") ***I think the answer 'should be', from largest to smallest: ***Cs, Pb, Sb, Se,

    asked by K on November 13, 2007
  18. Math

    Why Does The President Put Vegetables in His Blender? P.S.: It's puzzle 163 HELP!!!!!!!!!

    asked by Dorina on December 9, 2007
  19. chem

    3.0 mol sample of KClO3 was decomposed according to the equation 2KClO3 = 2KCl + 3 O2 How many moles of O2 are formed assuming 100% yield? is it 3 moles? I don't want to work through the details of this problem completely. Tell me what you don't understand

    asked by jill on July 17, 2007
  20. Physics Question......many thanks

    A projectile is shot directly away from Earth's surface. Neglect the rotation of Earth. (a) As a multiple of Earth's radius RE, what is the radial distance a projectile reaches if its initial speed is one-fifth of the escape speed from Earth? ____ times RE

    asked by Jessy on January 15, 2007
  21. Calculus

    I really need help with this problem an automobile accelerates from rest at 1 + 3(square root)t mph/sec for 9 seconds. How far does it travel in those nine seconds? I have found that the velocity, after nine seconds, is 63 I have figuredout the answer but

    asked by James on April 1, 2007
  22. Chemistry

    I have a few question about an equilibrium lab we performed. Approximately .1 g of CoCl2 * 6H2O was mixed with 2 mL of 12 M HCl. The solution turned blue. Then, water was added and stirred into the solution in 2 mL incriments until no further color change

    asked by Kim on May 29, 2007
  23. Economics

    Questions: Are the following workers more likely to experience short-term or long-term unemployment? Explain. a. A construction worker laid off because of bad weather. b. A manufacturing worker who loses her job at a plant in an isolated area. c. A

    asked by Sarah on March 24, 2007
  24. Physics

    A cylinder is fitted with a piston, beneath which is a spring, as in the drawing. The cylinder is open at the top. Friction is absent. The spring constant of the spring is 4100 N/m. The piston has a negligible mass and a radius of 0.023 m. (a) When air

    asked by Mary on April 24, 2007
  25. Romeo and Juliet (English Literature)

    1. To what heavenly body does Romeo compare Juliet? Why is this so? 2. What does Juliet mean when she says to Romeo, "tis, but thy name that is my enemy?" 3. How is Romeo let to Juliet's home? 4. Is it difficult for Romeo to win Juliet's love? Why? 5. Why

    asked by Han on October 31, 2007
  26. CHEM

    The mass of a golf ball is 45.9g. If it leaves the tee with a speed of 72.0 m/s, what is its corresponding wavelength? Express your answer numerically in meters. Would the correct answer be: lambda=h/mv lambda=6.626*10^-34/(45.9g)(72.0m/s)

    asked by K on November 5, 2007
  27. AP Chem

    A solution of potassium phosphate is mixed with a solution of calcium acetate. I am supposed to write a net ionic equation. Doesn't need to be balanced. Here is what I did: K3PO4(aq) + Ca(C2H3O2)2 --> KC2H3O2 + Ca3PO4 3K+ + PO4-3 + Ca+2 2(C2H3O2-) --> K+ +

    asked by Please check on October 3, 2007
  28. Calculus

    An equation of the line tangent to the graph of y=(2x+3)/(3x-2) at the point (1,5) is...do I take the derivative of y=(2x+3)/(3x-2) to find the slope and then plug that into y-5=m(x-1)?

    asked by Anonymous on November 18, 2007
  29. Chemistry

    What volume of O2 is required to react with excess CS2 to produce 4.0L of CO2 Assume all gases at STP. Not sure what I am doing wrong, but the answer I am getting is not one of the answers. 4L/X mole=22.4 L/1 mole ===>.1786 mols Balanced equation: O2 + CS2

    asked by T on December 13, 2007
  30. physics

    If a gasoline engine has an efficiency of 21 percent and loses 780 J to the cooling system and exhaust during each cycle, how much work is done by the engine? Is it 3709.5??? Chemical energy in (as fuel and oxygen) = Work out + Heat out 21% is the ratio of

    asked by anonymous on February 15, 2007
  31. Statistics

    A sign on the gas pump of a certain chain of gasoline stations encourages customers to have their oil checked, claiming that one out of every four cars should have its oil topped up. What is the probability that exactly 3 of the next 10 cars entering a

    asked by Matt on February 10, 2007
  32. MATH URGENT!

    Ok I don't understand how to find similar figures when using proportions. Can someone explain it to me? Two figures that have the same shape are said to be similar. When two figures are similar, the ratios of the lengths of their corresponding sides are

    asked by Ashley on April 24, 2007
  33. spelling

    what is the answer to this analogy brother:mother::fly:???? must start with the letters scr,spr,str,or thr brother:mother:fly brother:mother::fly:???? must end with scr, spr, str, thr brother:mother::fly:???? must end with scr, spr, str, thr i don't know i

    asked by austin on January 16, 2007
  34. Chemisry

    what mass of protons would be required to just neutralize the charge of 1.0g of electrons? how do I answer this? You know the mass of an electron. Calculate how many are in 1 gram. You will need the same number of protons. Knowing the mass of a proton

    asked by Chris on February 8, 2007
  35. physics!! plz answer me!

    A 0.15 kg baseball moving at +26 m/s is slowed to a stop by a catcher who exerts a constant force of -390 N. How long does it take this force to stop the ball? How far does the ball travel before stopping? plz plz plz help!!

    asked by julia on December 10, 2007
  36. Statistics

    Thank you!! A survey of an urban university (population of 25,450) showed that 750 of 1100 students sampled attended a home football game during the season. What inferences can be made about student attendance at football games? Using the 99% level of

    asked by Jenny on December 19, 2007
  37. math

    You are reducing a map of dimensions 2 ft by 3 ft to fit to a piece of paper 8 in by 10 in. What are the dimensions of largest possible map that can fit on the page? I really don't know how to do this but so far I tried to make 2 proportions by changing

    asked by keisha on November 24, 2007
  38. Physics

    This is probably a really easy question, but I just don't know how to set it up. An object in equilibrium has three forces exerted on it. A 33 N force acts at 90 degrees from the x-axis and a 44 N force acts at 60 degrees. What are the magnitude and

    asked by Corin on November 12, 2007
  39. Chemistry

    What is the pressure (in atmospheres) of the gas inside the container connected to an open-end, mercury-filled manometer as shown in the picture? The atmospheric pressure is 0.95atm. l----l | (G) l | l - --- l Hg l Hg *18cm - - --- Hg Hg HgHgHgHg what

    asked by leo on October 21, 2007
  40. COLLEGE PHYSICS

    a uniform bridge span weighs 50x10^3 and is 40m long. A car weighing 15X10^3 is parked with its center of gravity located 12m from the right pier. what upward support force does the left pier provide? im lost....this is what i think im supposed to do

    asked by natali on November 11, 2007
  41. CHEM

    A cylinder with a movable piston contains 2.00g of helium, He, at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the

    asked by K on October 28, 2007
  42. Chemistry

    Which radioactive sample would contain the greatest remaining mass of the radioactive isotope after 10 years? A. 2.0 grams of 198 Au B. 2.0 grams of 42 K C. 4.0 grams of 32 P D. 4.0 grams of 60 Co By the way the numbers next to the elements are their

    asked by Sanjay on March 3, 2007
  43. stat

    Which of the following statements is true about the t-distribution with k degrees of freedom? i. the t-distribution is symmetric ii. the t-distribution with k degrees of freedom has a smaller variance than the t-distribution with k+1 degrees of freedom

    asked by Anonymous on May 2, 2007
  44. 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 on December 4, 2007
  45. reading

    is the word penguin a metaphor?? please answer bye. It could be, depending on how it is used. Metaphors are totally dependent on usage and how they are compared. The men were penguins for the dinner, waddling to and fro. ya but could i use it as a metaphor

    asked by brittany on January 4, 2007
  46. CHEM

    You are a researcher for a golf club manufacturer. You are given two identical looking cubes of a metal alloy. You are informed that they are made of the exact same material, but one is a crystalline, while the other is amorphous. It is your job to

    asked by K on November 28, 2007
  47. Chemistry

    In a thermochemistry experiment the reaction of 0.0857 g of an unknown metal and an excess of 4.0 M HCl resulted in a 0.210 mL decrease in the volume of an ice/water mixture. Calculate the enthalpy of this reaction per 1 g of metal reacted. Needed data:

    asked by Raj on December 1, 2007
  48. physics

    A 650 kg weather balloon is designed to lift a 4600 kg package. What volume should the balloon have after being inflated with helium at 0 degrees celcius and 1 atm pressure to lift the total load? The buoyancy force must equal the weight lifted. Let V be

    asked by Anonymous on May 9, 2007
  49. AP chem

    A 0.345g sample of anhydrous BeC2O4, which contains an inert impurity, was dissolved in a sufficient water to produce 100ml of solution. A 20.0ml portion of the solution was titrated w/ KMnO4(aq). The balanced equation for the reaction that occurred is as

    asked by michelle on January 4, 2007
  50. Chemistry

    At 1100 K, Kp=0.25 for the following reaction. 2SO2(g) + O2(g) (reversible arrows) 2SO3(g) What is the value of K at this temperature? This is what I have so far: I did Kc=0.25(1100(0.0821))^-1 and got Kc=0.00276. That is incorrect. Why? What did I do

    asked by Taasha on July 31, 2007
  51. math

    5. A rubber ball dropped on a hard surface takes a sequence of bounces, each one 3/5 as high as the preceding one. If this ball is dropped from a height of 15 feet, what is the total distance it has traveled after it hits the surface the fifth time? The

    asked by Fidelia on May 31, 2007
  52. math

    How do you solve system of equations and tell if they're consistant and independant,consistant and dependent,and inconsistant? If you find no solutions then the system is inconsistent. Suppose you have N variables and M equations (N larger than or equal to

    asked by maddie on July 27, 2007
  53. science

    in a baseball-hitting contest at the office picnic, five men participated named: Biff, Carl, Fred, Marty, and Tom. Their last names in alphabetical order are Jenkins, Keech, McNabb, Miller, and Winslow. The distance that each man hit the ball in feet are:

    asked by angie on September 26, 2007
  54. CHEM

    The electron from a hydrogen atom drops from an excited state into the ground state. When an electron drops into a lower-energy orbital, energy is released in the form of electromagnetic radiation. Part A: How much energy does the electron have initially

    asked by K on November 4, 2007
  55. physics

    Three point charges, q1, q2, and q3, lie along the x-axis at x=0, x=3 cm, and x=5 cm, respectively. Calculate the magnitude and direction of the electric force on each of the three points when q1=+6.0 muC, q2=+1.5 muC, and q3=-2.0 muC. I would add the

    asked by Mischa on April 11, 2007
  56. Sales tax

    tom paid 695.5 for a tv when 7% sales tax was included in that price what was the price of the tv before the tax and how much sales tax did tom pay? You can set it up this way: 1.07x = 695.5 x = _______ That will tell you the price of the TV. The

    asked by Arkuk on April 13, 2007
  57. Chemistry

    Magnesium sulfate is often used it first aid hot-packs giving off heat when dissolved in water. When 2.00 g of MgSO4 dissolves in 15.0 mL of water (d= 1.00g/mL) at 25.0ÂșC, 1.51 kJ of heat is evolved. A) Write the balanced equation for this reaction. I

    asked by Chris on January 28, 2007
  58. CHEM-last part prob.

    Aluminum reacts with chlorine gas to form aluminum chloride via the following reaction: 2Al(s) + 3Cl2(g) -> 2AlCl3(s) You are given 19.0g of aluminum and 24.0g of chlorine gas. a)If you had excess chlorine, how many moles of of aluminum chloride could be

    asked by K on October 16, 2007
  59. Physics

    A spring has a force constant of 100N/m and an unstretched lenght of .07 m. One end is attached to a post that is free to rotate in the center of a smooth table. The other end is attatched to a 1 kg disc moving in uniform circular motion on the table,

    asked by Tammy on March 25, 2007
  60. african literature

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

    asked by klar maesen on December 4, 2007
  61. Chemistry

    At 40 degrees Celsius, the value of Kw is 2.92 X 10^-14 a.) calculate the [H+] and [OH-] in pure water at 40 degrees celsius b.)what is the pH in pure water at 40 degrees celsius c.)if [OH-] is .18M , what is the pH

    asked by Rebekah on December 21, 2007
  62. Algebra

    Hi! My name is Jason... today I have 2 problems for you both having to deal with Algebra. My questions are ::: Question 1 :: Direction: Find the degree of the polynomial. Problem: - 1 + 8 x ^ 4 - x ^ 2 (negative 1 plus 8x squared minus x squared) Question

    asked by Jason on August 20, 2007
  63. Chemistry

    Commercial vinegar was titrated with NaOH solution to determine the content of acetic acid, HC2H3O2. For 20.0 milliliters of the vinegar 26.7 milliliters of 0.600-molar NaOH solution was required. What was the concentration of acetic acid in the vinegar if

    asked by Sarah on May 23, 2007
  64. calculus

    a particle moves along the curve xy=10. if x=2 and dy/dt=3, what is the value of dx/dt. i'm guessing this is something to do with parametric equations. if x is 2, then y=5. but how do i get dx/dt. you have to differentiate the equation with respect to t so

    asked by Anonymous on April 21, 2007
  65. Chemistry

    Why is CH3I have a higher boiling point than CH3Cl? I thought, since Cl is more electronegative, it withdraws more electron density to its part and hence increase dipole movement within the atom and hence, requiring more energy to split them up and that

    asked by Vic on August 24, 2007
  66. Physics

    A small first aid kit is dropped by a rock climber who is descending steadily at 1.3 m/s. After 2.5 s, what is the velocity of the first-aid kit, and how far is the kit below the climber? This problem seems like it should be easy, but I'm not sure which

    asked by Stephanie on September 30, 2007
  67. CHEM

    For a molecule of fluorous acid, the atoms are arranged as HOFO. What is the formal charge on each of the atoms? Enter the formal charges in the same order as the atoms are listed. For this question I tried entering: +1,-2,+3,-2 and it was wrong...as was:

    asked by K on November 26, 2007
  68. physics- torque

    1. Find the magnitude of the torque produced by a 3.0 N force applied to a door at a perpendicular distance of 0.25 m from the hinge. 2. A simple pendulum consists of a 3.0 kg point mass hanging at the end of a 2.0 m long light string that is connected to

    asked by Anonymous on January 13, 2007
  69. Economics

    Suppose that the residents of Vegopia spend all of their income on cauliflower, broccoli, and carrots. In 2006 they buy 100 heads of cauliflower for $200, 50 bunches of broccoli for $75, and 500 carrots for $50. In 2007, they buy 75 heads of cauliflower

    asked by Sarah on April 2, 2007
  70. chemistry

    Can someone please tell me why I would (or wouldn't) expect a color change if FeCl3 were added to pure aspirin and also to oil of wintergreen? (I know aspirin is mostly salicylic acid, and I'm not even sure what compounds are in oil of wintergreen, I'm

    asked by Lacey on June 12, 2007
  71. CHEM

    What is the hybridization of the central atom in COH2?? Would the correct response, out of the following: a) sp b) sp^2 c) sp^3 d) sp^3d e) sp^3d^2 "e"-> sp^3d^2??

    asked by K on November 26, 2007
  72. chemisty help

    for the reaction shown, compute the theoretical yield of the product in grams for each of the following initial amounts of reactants. Ti + 2F2 to make TiF4 There are 3 sub questions for this. Help me out with one, then I'll try to figure out the rest.

    asked by Becky on March 1, 2007
  73. physics

    A water slide is constructed so that swimmers, starting from rest at the top of the slide leave the end of the slide traveling horizontally. There is still a height between the surface of the water and the end of the slide. One person hits the water 5.00m

    asked by ajo on December 11, 2007
  74. anatomy

    if you wanted to flex your arm, and both your biceps and triceps contracted simultaneously, what would happen? and where is most of the muscle weight found in humans?

    asked by sara on October 28, 2007
  75. ALGEBRA 3

    WHICH ORDERED PAIR IS A SOLUTION OF THE FOLLOWING SYSTEM OF LINEAR EQUATION 2X-5Y=NEGATIVE 12 NEGATIVEX +4Y=9 A{NEGATIVE6,0} B{3,3} C{NEGATIVE1,2} D{2,2} It is a trivial matter to put in each of the answers to see if the equation balances, much faster than

    asked by WOLF on January 12, 2007
  76. Econ MC

    Two firms, A and B, each currently dump 50 tons of chemicals into the local river. The government has decided to reduce the pollution and from now on will require a pollution permit for each ton of pollution dumped into the river. The government gives each

    asked by Anonymous on March 6, 2007
  77. CHEM

    A) a picture shows a container that is sealed at the top by a movable piston. Inside the container is a ideal gas at 1.00atm , 20.0 *C, and 1.00L. (The pic is of a 2L container which has a piston pushed downward to the 1L level. Under the piston, under the

    asked by K on October 28, 2007
  78. Chemistry (please help me!)

    H2(g) + CO2(g) H20(g) + CO(g) When H2(g) is mixed with CO2(g) at 2,000K, equilibrium is achieved according to the equation above. In one experiment, the following equilibrium concentrations were measured: [H2]=0.20 M [CO2]=0.30 M [H2O]=[CO]=0.55M a) What

    asked by sara on February 25, 2007
  79. Gen chem II

    Calculate the work done when 50.0g of tin dissolves in excess acid at 1.00atm and 25 (degree in celsius) Sn(s)+2H(aq)----- Sn(aq) +H2(g) Assume ideal gas behavior The work done = (pressure)*(increase in volume) The increase in volume is due to the H2 gas

    asked by Farzan on March 5, 2007
  80. physics

    Please see if I am doing this problem right. A mixture of gasoline vapor and air is placed in an engine cylinder. The piston has an area of 7.4 X 10^-3 m^2 and is displaced inward by 7.2 X 10^-2 M. If 9.5 X 10^5 Pa of pressure is placed on the piston, how

    asked by Anonymous on February 4, 2007
  81. Math Homework

    1) Given the side of a square pyramid is 6cm and the altitude is 4cm calculate the surface area. 2) Given the side of a square pyramid is 12cm and the altitude is 8cm calculate the surface area. 3) Given the side of a square pyramid is 18cm and the

    asked by Student on February 6, 2007
  82. Chemistry

    Rank the ions in order of decreasing size. Sr2+, Ba2+, Cs Cs>Ba>Sr

    asked by Sally on November 9, 2007
  83. help me for this stupid worksheet

    the question is.. why did the ghost decide to haunt city hall? urgh i don't fee like doing it so im hoping someone has the answer :] You might have gotten an answer if you'd told us the source of your question. To which story, poem, play are you referring?

    asked by brooke on January 31, 2007
  84. maths

    what fraction of 30p is 5p?

    asked by nishchay on November 26, 2007
  85. physics

    A pendulum clock that works perfectly on Earth is taken to the Moon. (a)Does it run fast or slow there? (b) if the clock is started at 12:00:00 am, what will it read after one Earth day(24hrs)? Assume that the free-fall acceleration on the Moon is 1.63

    asked by steph on March 21, 2007
  86. pre-cal... compound interest and modeling data

    Please help me with these 2 problems! 1. Complete the table for the time t necessary for P dollars to triple if interest is compounded continuously at rate r. r= 2%, t=? r= 4%, t=? r= 6%. t=? r= 8%, t=? r= 10%, t=? r= 12%, t=? 2. Draw a scatter plot of the

    asked by anonymous on December 11, 2007
  87. Grammar

    When learning pronoun case (subjective pronoun,objective,possessive) do I need to just memorize the list? I am having trouble identifying them. Any help please. I am in 5th grade. I recommend memorize, using homemade flash cards. It wont take long to

    asked by Lex on February 14, 2007
  88. Chemistry

    Propose a method for determining the specific heat for a metal like sodium, which reacts with water.

    asked by M on October 15, 2007
  89. calculus

    The radius of a circle is increasing at a nonzero rate, and at a certain instant, the rate of increase in the area of the circle is numerically equal to the increase in its circumstance. At this instant, the radius of the cirle is... Here is what I did:

    asked by Anonymous on November 18, 2007
  90. physics

    1. The efficiency of a squeaky pulley system is 73 percent. The pulleys are used to raise a mass to a certain height. What force is exerted on the machine if a rope is pulled 18.0 m in order to raise a 58 kg mass a height of 3.0 m? Answer: 13.24 N? A

    asked by anonymous on January 17, 2007
  91. history- world war 1 entrance

    What slowed down the U.S. entrance into World War 1? I already have many Americans simply did not want to send their sons to war and pacifists urged the United States to set an example for peace. I need one more. Your question presumes it should have been

    asked by Anonymous on February 1, 2007
  92. physics

    The hour hand and the minute hand for the famous Parliament clock tower Big Ben in London are 2.7m and 4.5m long and have masses of 60kg and 100kg, respectively. Calculate the total torque due to weight of these hands about axis of rotation when the time

    asked by Anonymous on December 9, 2007
  93. Chemistry

    I'm trying to find if potassium nitrate is polar or non-polar by using the electronegativity scale. Can someone check my work? Electronegativity: potassium: 0.82 nitrogen: 3.04 oxygen: 3.44 =3.44-3.04 =0.82-0.4 =0.4 =0.42 So the final answer is 0.42 and by

    asked by Marty on November 10, 2007
  94. physics

    A box of books weighing 300N is shoved the floor of an apartment by a force of 400N exerted downward at an angle of 35.2 degrees below the horizontal. If the coefficient of kinetic friction between box and floor is .570, how long does it take to move the

    asked by Anonymous on October 14, 2007
  95. math

    what is the answer to the riddle "why is it good to play cards in a graveyard"

    asked by Anonymous on December 16, 2007
  96. s.s

    before there was mills what was used to make thread? Before there were mills and factories, people made thread at home on spinning wheels. Check this site for more information and a picture of a spinning wheel. http://en.wikipedia.org/wiki/Spinning_wheel

    asked by Melsissa on February 8, 2007
  97. English

    In high school we have to read great expectations by Charles !@#$%^&ens for honors English but i do not understand the essay I have to write. Could someone help me please? Compare and contrast the ways in which the protagonist is stuck between two worlds,

    asked by Natalie on September 1, 2007
  98. Chemistry

    Phthalic acid, H2C8H404, is a diprotic acid used in the synthesis of phenolphthalein indicator. Ka1= 1.2x 10^-3, and Ka2 = 3.9 x 10^-6. a) Calculate the hydronium-ion concentration of a .015 M solution. b) What is the concentration of the C8H4O4^-2 ion in

    asked by Rachael on April 2, 2007
  99. Economics

    7. Suppose there are two possible income distributions in a society of ten people. In the first distribution, nine people have incomes of $30,000 and one person has an income of $10,000. In the second distribution, all ten people have incomes of $25,000.

    asked by Sarah on March 8, 2007
  100. finance

    Residual dividend model Buena Terra Corporation is reviewing its capital budget for the upcoming year. It has paid a $3.00 dividend per share (DPS) for the past several years, and its shareholders expect the dividend to remain constant for the next several

    asked by Linda on September 4, 2007