Questions Asked on
July 20, 2013

  1. Chemistry

    At 25C only .0190 mol of the generic salt AB2 is soluble in 1.00L of water. What is the Ksp of the salt at 25C? AB2A^2+ + 2B^- I took the .0190 mol and doubled it and multiplied by .019 again and got 6.859x10^-6 and got it wrong what should I do? Please

    asked by Cat
  2. physics

    a vertical spring with spring stiffness constant 305 n/m oscillates with an amplitude of 28.0 cm when 0.260 kg hangs from it. the mass passes through the equilibrium point (y=0) with positive velocity at t=0. (a) what equation describes this motion as a

    asked by Shandy
  3. algebra

    Company A rents copiers for a monthly charge of $360 plus 12 cents per copy. Company B rents copiers for a monthly charge of $720 plus 6 cents per copy. What is the number of copies above which Company A's charges are the higher of the two?

    asked by anna
  4. physics

    A full can of soda has a mass of 0.421 kg. It contains 3.57 x 10-4 m3 of liquid. Assuming that the soda has the same density as water, find the volume of aluminum used to make the can.

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  5. Physics

    On a certain dry sunny day, a swimming pool's temperature would rise by 1.60°C if not for evaporation. What fraction of the water must evaporate to carry away precisely enough heat to keep the temperature constant? (Lv =2430kJ/kg or 580kcal/kg)

    asked by Alice
  6. trig

    1. A Ferris wheel with a radius of 7m makes one complete revolution every 16 s. The bottom of the wheel is 1.5m above ground. a)Find the equation of the graph b)predict how the graph and the equation will change if the Ferris wheel turns more slowly c)

    asked by Azal
  7. physics

    In 1986 a gargantuan iceberg broke away from the Ross Ice Shelf in Antarctica. It was approximately a rectangle 160 km long, 45.0 km wide, and 250 m thick. (a) What is the mass of this iceberg, given that the density of ice is 917 kg/m3? (b) How much heat

    asked by Eric
  8. Chemistry

    Calculate the percent yield for the reaction if 76.8 g of H2O reacted and 125 g of NO were produced. NO2+H2O->HNO3+NO

    asked by Sara
  9. Chemistry

    A sample of oxygen is collected over water at 22 C and 762 torr. What is the partial pressure of the dry oxygen? The vapor pressure of water at 22C is 19.8 torr.

    asked by Sara
  10. trig

    An object suspended from a spring is oscillating up and down. The distance from the high point to the low point is 30 cm, and the objects take 4 sec to complete 5 cycles.For the first few cycles the distance from the mean position, d(t), in cm with respect

    asked by Azal - pleaseee helpp
  11. Chemistry

    Calculate how much acetylene (C2H2) can be produced from 358 g of H20 and an excess of CaC2 if the perfect yield for this reaction is 94.5% CaC2+H2)-> C2H2+C2H2+CA(OH)2

    asked by Sara
  12. Chemistry

    CoCl2CO+Cl2 Keq=7.6*10^-4 M CoCl2 is introduced in a closed container until its concentration is .890 M. What will be the concentration of Cl2 once the reaction has reached equilibrium?

    asked by Sara
  13. Accounting

    For the past year, Hornbostel Company had fixed costs of $6,552,000, a unit variable cost of $444, and a unit selling price of $600. For the coming year, no changes are expected in revenues and costs, except that a new wage contract will increase variable

    asked by Anonymous
  14. Chemistry

    A sample of oxygen is collected over water at 22 C and 762 torr. What is the partial pressure of the dry oxygen? The vapor pressure of water at 22C is 19.8 torr

    asked by Sara
  15. Physics

    The sun radiates like a perfect blackbody with an emissivity of exactly 1. (a) Calculate the surface temperature(K) of the sun, given it is a sphere with a 7.00 multiplied by 108 m radius that radiates 3.80 multiplied by 1026 W into 3 K space. (b) How much

    asked by Alice
  16. physics

    The "steam" above a freshly made cup of instant coffee is really water vapor droplets condensing after evaporating from the hot coffee. What is the final temperature of 200 g of hot coffee initially at 90.0°C if 2.00 g evaporates from it? The coffee is in

    asked by Alice
  17. geometry

    ABCD is a square. P is a point inside the square, such that AP:BP:CP=1:2:3. What is the value (in degree) of angle APB?

    asked by debjit
  18. general physics

    A meat baster consists of a squeeze bulb attached to a plastic tube. When the bulb is squeezed and released, with the open end of the tube under the surface of the basting sauce, the sauce rises in the tube to a distance h, as the drawing shows. Using

    asked by please help with these practice problems
  19. critical thinking

    I am struggling with deciding which evaluation criteria best fits for writing a critical essay on the passage written by Stephen Chapman...Legal Drugs Unlikely to Foster Nation of Zombies. I believe that this is a non-deductive argument. I was considering

    asked by nan
  20. physics

    A lighthouse standing on the top of a cliff is observed from two open boats (boats are not decked over) A and B in a vertical plane through the light house. The angle of elevation of the top of the lighthouse viewed from B is 16 degrees and the angles of

    asked by Romar
  21. Chemistry (Gas Law)

    A fire extinguisher filled with carbon dioxide has a mass of 3500g. After releasing all of the CO2, the mass of the extinguisher is 2735g. What was the pressure reading on the gauge before any CO2 was released, if the volume of the extinguisher is 4.25 L

    asked by Anonymous
  22. Accounting

    For the current year ending April 30, Hal Company expects fixed costs of $60,000, a unit variable cost of $70, and a unit selling price of $105.

    asked by Anonymous
  23. Accounting

    If fixed costs are $240,000, the unit selling price is $32, and the unit variable costs are $20, what are the old and new break-even sales (units) if the unit selling price increases by $4? a. 12,000 units and 15,000 units b. 7,500 units and 6,667 units c.

    asked by Anonymous
  24. Chemistry

    An aqueous solutions is 18.7% by mass Na3PO4. What is the boiling point of this solution? The Kb for water is .512 C/m. Consider if the solute is an electrolyte or a nonelectrolyte.

    asked by Sara
  25. Chemistry

    A gas mixture containing N2 and O2 was kept inside a 2 L container at a temperature of 23 C and a total pressure of 1 atm. The partial pressure of oxygen was .722 atm. How many grams of nitrogen were present in the gas mixture?

    asked by Sara
  26. math

    a quiz has 25 questions with 4points awarded for each correct answer and 1 point deducted for each incorrect answer,with zero for each question omitted.John scores 77points.how many questions did he omit?

    asked by sarah
  27. Chemistry

    Need help identifying organic functional groups of Mifepristone's lewis structure.

    asked by Tiffany
  28. ISBM

    The price P per unit at which a company can sell all that it produces is given by the function P(x) = 300 — 4x. The cost function is c(x) = 500 + 28x where x is the number of units produced. Find x so that the profit is maximum.

    asked by Nitish
  29. general physics

    The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. A swimming polar bear climbs onto a piece of floating ice that has a volume of 6.76 m3. What is the weight of the heaviest bear that the ice can support without sinking completely

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  30. general physics

    A solid concrete block weighs 160 N and is resting on the ground. Its dimensions are 0.400 m x 0.240 m x 0.0950 m. A number of identical blocks are stacked on top of this one. What is the smallest number of whole bricks (including the one on the ground)

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  31. Chemistry

    When the following reaction took place at 23.8 and a pressure of 758 torr, 3.9 L of o2 were collected. What mass of KCIO3 decomposed? KCIO3->KCI+O2

    asked by Sara
  32. physics

    The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 8.80 g of condensation forms on a glass containing water and 170 g of ice, how many grams will melt as a result? Assume no other heat transfer

    asked by Eric
  33. Chemistry Honors

    A 0.25 mol sample of n204 dissociates and comes to equilibrium in a 1.5 L flask at 100 degrees C. The reaction is N2O4 > 2 NO2. The Kc at 100 degrees C is 0.36. What are the equilibrium concentrations of NO2 and N2O4?

    asked by Marie Genvieve
  34. Chemistry

    Calculate the number of moles of excess reactant that will be left-over when .350 g if HCN react with .500 g of 02: HCN+O2->N2+CO2+H20

    asked by Sara
  35. physics

    A slab of a thermal insulator with a cross-sectional area of 115 cm2 is 4.00 cm thick. It is made out of red brick with thermal conductivity 0.600 J/s∙m•C°. The temperature difference between opposite faces is 95.0 C°. Calculate the following: (a)

    asked by Alice
  36. physics

    The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 8.80 g of condensation forms on a glass containing water and 170 g of ice, how many grams will melt as a result? Assume no other heat transfer

    asked by Alice
  37. calculus

    If f(x)=∫ (from -x to x) cos(t)/(1+e^t) dt and x=asin(77/85), then the absolute value of f′(x)−f(x) can be expressed as a/b, where a and b are coprime positive integers. What is the value of a, and what is the value of b?

    asked by andy
  38. math

    Q1:solve log(5)x-log(25)(x+10) = 0.5 Q2:If 2log(a)x=1+log(a) (7x-10a) ,find x in terms of a. Q3:Find x for which 27x3^lgx = 9^1+lg(x-20) Q4:Find x in terms of a and c ,given that log(√ a)(1/x)+log(a)x +log(a^2) x +log (a^4)x=c

    asked by Anonymous
  39. chemistry

    calculate the Ph of 0.3 M sodium propanoate, Ka 2.0 x 10 base -3. then calculate the pH after 0.03 mol NCL is added to 2L of the first solution.

    asked by Mandy
  40. general physics

    Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 6.3 x 1028 kg and 1.6 x 103 m. (a) Find the density of such a star. (b) If a dime (V = 2.0 x 10-7 m3) were made from this

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  41. Chemistry

    How many liters of Cl2 has at a pressure of .950 atm and a temperature of 298K will be collected from the reaction of 25 mL of a .100 M aqueous solution of KMnO4 and an excess of HCI? KMnO4+HCI->MnCl2+Cl2+H2)+KCl

    asked by Sara
  42. Accounting

    Motorcycle Manufacturers, Inc. projected sales of 76,000 machines for 2012. The estimated January 1, 2012, inventory is 6,500 units, and the desired December 31, 2012, inventory is 7,000 units. What is the budgeted production (in units) for 2012? a. 66,000

    asked by Anonymous
  43. Statistics

    I need help with this please. It is a multiple choice question, so choose one from a,b,c please. I believe the correct is c. What do you think? Ari lives about 10 minutes away from the college to which he intend to attend a summer seminar of 10 weeks.

    asked by Andrew
  44. math

    The average temperature for the month of April is 65 degrees. The temperatures ranged from 12 degrees warmer or colder. Write and solve an absolute value equation to represent this information. Write you answer in a sentence format to explain your answer.

    asked by rick
  45. Family

    Children, family and society

    asked by Tina
  46. Chemistry

    A mixture containing 5 g of H2 and 10 g of o2 is allowed to react in a 15 L rigid container at a constant temperature of 25 C. H2+O2->H2O Once the reaction is complete, what will be the pressure of the excess gas inside the container?

    asked by Sara
  47. English

    Informational text includes which of the following: a. a setting c. a plot b. a conflict d. an explanation

    asked by Anonymous
  48. Vocabulary

    choose the term that matches the definition. A belief that one's culture is superior to another. a.ethnocentrism b.prejudice c.stereotype d. racism i thinks its b or d

    asked by LadyT
  49. Teachers aide

    Latchkey children are

    asked by Tina
  50. English

    Ok so I have to do a comparative essay on a book and a film (I chose The Hobbit) .This is a comparison essay exploring to what degree an inherent film is discussed and how it relates to an aspect of the human condition. So my theme is revenge and the

    asked by Kristen
  51. science

    a small dog is train to jump straight up a distance of 1.2m. how much kinetic energy does the 7.2-kg dog need to jump this high ( the acceleration due to gravity is 9.8m/s2

    asked by keisha
  52. Vocabulary

    choose the term that matches the definition. building and construction. a.architecture b. engineering c.nursing d.statistics b

    asked by LadyT
  53. American History

    True or False Questions 1. The Kansas-Nebraska Act dealt a serious blow to sectional harmony by simply strengthening the Missouri Compromise. 2. Planters or merchants took advantage of the sharecropping system by forcing blacks to use credit to buy good

    asked by Anonymous
  54. general physics

    What is the smallest number of whole logs (ñ = 725 kg/m3, radius = 0.0556 m, length = 3.80 m) that can be used to build a raft that will carry four people, each of whom has a mass of 73.0 kg?

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  55. math

    2 people start off to work directly away from each other.they each walk for 4 kms then turn directly to their right and walk for another 3 kms.how far apart are they

    asked by sarah
  56. math

    solve log(5)(5x-4) = log(√5)(2-x)

    asked by Anonymous
  57. geometry

    Ryan’s teacher asked him to graph circle E with equation (x – 5)2 + y2 = 25. Below is the graph he submitted. Circle E that contains points 30, 0; 5, negative 25; negative 20, 0; 5, 25. What, if anything, did Ryan do wrong when graphing this equation?

    asked by leroy
  58. accounting

    how can full-absorption costing be abused by management to misstate financial results

    asked by Patiance
  59. calculus

    If f(x)=∫ (from -x to x) cos(t)/(1+e^t) dt and x=asin(77/85), then the absolute value of f′(x)−f(x) can be expressed as a/b, where a and b are coprime positive integers. What is the value of a+b?

    asked by andy
  60. Calculus-HELP!!!

    Find the complete general solution and a particular solution that satisfies the initial conditions: 2y'' + y' - 4y = 0 y(0)=0, y'(0)=1

    asked by Elyse
  61. GCSE Physics

    The energy value of gas used in a home is measured in KWH. The home owner has a prepayment meter and pays £30 into his account. With a prepayment meter, gas cost 15p per KWH. Use the below equation to calculate the total number of hours that the gas

    asked by abu hamza
  62. Statistics

    I need help with this please. A researcher is designing a research study. He hopes to show that the results of an experiment are statistically significant. What size of p value would take? a) Large value of p b) Small value of p c) The size of the p value

    asked by Andrew
  63. English

    Are adventure, revenge, Heroism and prejudice all human conditions?

    asked by Kristen
  64. Chemistry Honors

    At a particular temperature, 12.0 mol of NH3 is introduced into a 2.0 container, and the NH3 partially dissociates by the reaction: 2NH3 N2 + 3H2 At equilibrium, 6.0 mol of H2 gas are present. Calculate the K for this reaction.

    asked by Marie Genvieve
  65. math

    it takes 3weeks to build a large garage.if it takes 2/3 of a week to construct the frame and 5/4 of a week to put the roof on.how much time is spent on the rest of the construction?

    asked by sarah
  66. math

    The answer to the maths question was: "age>21". Make up a question that could have this as an answer.

    asked by Melissa
  67. Physics Lab

    Collision derivation problem. A car is released from rest on a frictionless inclined plane. Assume h/L is approximately equal to y/x. equations. If the car has a mass of 0.2 kg, the ratio of height to width of the ramp is 11/110, the initial displacement

    asked by Tiff
  68. Maths

    If f(x)=sin(x)+sin^2(x+60)+cos(x)cos(x+60) and g(5/4)=1 then find g0f

    asked by Anonymous
  69. math

    The answer to the maths question was: "age>21". Make up a question that could have this as an answer.

    asked by Melissa
  70. Science

    A thin plastic blanket, with a shiny metallic surface, is wrapped a walker who has collapsed after a steep climb. Which type of heat loss is the shiny surface intended to reduce?

    asked by Michelle
  71. english

    Ms sue you mean to say its correct ? Is there anything else I write in addition to it or improve what I have written

    asked by kirat
  72. math

    as a regular customer in my favourite restaurant,i get 10%discount.but to the cost of the meal must be +17.5%gstand 12%service charge.if the %are to be worked out in turn(which each%-addition or discount-being on the previous answer),which order of working

    asked by sarah
  73. math

    5 people measured a metal bar using the same measuing instrument,but each read the scale to a different level of accuracy.their 5 answers are show below.4 of them are correct(to the chosen level of accuracy),but one is not.which is the odd one out?1)244mm

    asked by sarah
  74. calculus

    f(x) and f′(x) are continuous, differentiable functions that satisfy f(x)=x^3+4x^2+∫ (from 0 to x)(x−t)f′(t) dt. What is f′(5)−f(5)?

    asked by andy
  75. Algebra 2

    -Explain the difference between log base b of m plus log base b of n and log base b (m+n). Are they equivalent? -Explain the difference between log base b (mn) and ( log base b of m)(log base b of n). Are they equivalent?

    asked by Anonymous