walter

Popular questions and responses by walter
  1. Science/Math

    A sailboat heads north at 3 m/s for 1 hour and then tracks back to the southeast (at 45 degrees to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location? The textbook that included the word problem is:

    asked on September 30, 2013
  2. Chemistry

    From the following data at 25°C, H2(g) + Cl2(g) → 2HCl(g) ΔH0 = −185 kJ 2H2(g) + O2(g) → 2H2O(g) ΔH0 = −483.7 kJ Calculate ΔH0 at 25°C for the reaction below. 4HCl(g) + O2(g) → 2Cl2(g) + 2H2O(g)

    asked on June 18, 2014
  3. Biomechanics

    A pitched ball with a mass of 1 kg reaches a catcher's glove traveling at a velocity of 28 m/s. How much momentum does the ball have? how much impulse is required to stop the ball? If the ball is in contact with the catcher's glove for 0.5 s during the

    asked on November 21, 2010
  4. Physics

    A small rock is thrown vertically upward with a speed of 13.0 m/s from the edge of the roof of a 20.0 m tall building. The rock doesn't hit the building on its way back down and lands in the street below. Air resistance can be neglected. A.) What is the

    asked on September 10, 2011
  5. math

    mr. Carr is installing wall to wall carpeting in a room that measures 12 1/2ft by 9 2/3 ft how much will it coast if the carpet is $26 per square yard

    asked on July 6, 2016
  6. modern physics - relativity

    A photon of energy E collides with a stationary particle of rest mass m0 and is absorbed by it . (A) what is the velocity of resulting composite particle ? (B) What is the mass of the resulting composite particle ? use conservasion of energy / momentum

    asked on June 7, 2011
  7. Science

    a layer of ice has an area of 35m2 and is 2.5cm thick and is -7.5'c. how much water (in kilograms) is needed to melt the ice?

    asked on March 22, 2014
  8. Science/Math

    Word Problems pages 18-19 A sailboat heads north at 3 m/s for 1 hour and then tracks back to the southeast (at 45 degrees to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location? The textbook that

    asked on September 29, 2013
  9. maths

    factorise the following equation 680x3-1407x2-614x+285 where x2 x3 mean x to the power of

    asked on October 26, 2007
  10. chemistry

    Aspirin is a monoprotic acid called acetylsalicylic acid. Its formula is HC9H7O4. A certain pain reliever was analyzed for aspirin by dissolving 0.311 g of it in water and titrating it with 0.0398 M KOH solution. The titration required 22.32 mL of base.

    asked on June 14, 2015
  11. physics

    A swimmer wants to cross a river, from point A to point B, as shown in the figure. The distance d1 (from A to C) is 200 m, the distance d2 (from C to B) is 180 m, and the speed of the current in the river is 1.0 m/s. Suppose that the swimmer's velocity

    asked on October 15, 2015
  12. math

    i am a number between 5 and 10. my decimal is in tenths. the sum of my digits is 10. what number could i be?

    asked on October 3, 2014
  13. Chemistry 104

    A reaction rate doubles when the temperature increases from 0 degrees Celsius to 10 degrees Celsius, maintaining everything else equal. What is the activation energy for this reaction? (R = 8.314 J/mol K)

    asked on March 8, 2013
  14. Chemistry 104

    A reaction rate doubles when the temperature increases from 0 degrees Celsius to 10 degrees Celsius, maintaining everything else equal. What is the activation energy for this reaction? (R = 8.314 J/mol K)

    asked on March 8, 2013
  15. chemistry

    For the reaction Al (s) + 3 HCl (aq) -> AlCl3 (s) + ₃/₂ H2 (g), it was observed that when 4.00 g of aluminum reacted with excess HCl, exactly 30.0 kJ of heat were released. The delta H for this reaction is a) – 91.3 kJ b) – 120 kJ c) – 202 kJ d)

    asked on January 23, 2012
  16. chemistry

    For the reaction Al (s) + 3 HCl (aq) -> AlCl3 (s) + ₃/₂ H2 (g), it was observed that when 4.00 g of aluminum reacted with excess HCl, exactly 30.0 kJ of heat were released. The delta H for this reaction is a) – 91.3 kJ b) – 120 kJ c) – 202 kJ d)

    asked on January 23, 2012
  17. relativity

    Show that the following process is dynamically inpossible: A single photon in empty space is transformed into an electron and a positron, each with rest mass m(e).Explain in detail, How can this this process be made possible? In this case, what is the

    asked on June 7, 2011
  18. Basic Math

    I need help adding fractions with different denominators. Here is the problem... 1 - 1/2 + 1/3 - 1/4 + 1/5 - 1/6 I can see that the demoninators increase. Since they are both addition and subtraction, how do I do this problem? Thanks, Walter, New York.

    asked on February 14, 2011
  19. Math

    start with the word RODE. change one letter at a time to form a new until u have the word FILM. the best solution has the fewest steps.

    asked on December 16, 2010
  20. chemistry

    Given the equilibrium system PCl5(g) PCl3(g) + Cl2(g) K = 12.5 at 60 degrees Celsius. A 1.0-L reaction vessel is analyzed and found to contain 3.2 mol Cl2(g), 1.5 mol PCL3(g) and 3.0 mol PCl5(g). Show that the reaction mixture has not yet reached

    asked on April 8, 2008
  21. maths

    solve the following equation for x

    asked on November 12, 2007
  22. chemistry

    write a balanced chemical equation for calcium nitate plus sulfuric acid produces calcium sulphate and ? This is a metathetical reaction, I think more properly called a double displacement reaction now. Just change + and - partners. Ca(NO3)2 + H2SO4 ==>

    asked on August 9, 2007
  23. problem solving

    25 Miles Long After 2 Hours John Has Run 7 Miles. How Many Miles, M Does John Have Left To Run?

    asked on August 22, 2016
  24. physics

    You throw a snowball at an angle of 34.0° below the horizontal from the roof of a building that is 74.0 m above flat ground. The snowball hits the ground a distance of 44.0 m from the base of the building. Assume free fall with up as positive, and use g =

    asked on October 15, 2015
  25. phy

    A young man is throwing rocks gently up to his girlfriend's window, and he wants the rocks to hit the window moving only with a horizontal component of velocity. He is standing at the edge of a flower bed h = 7.9 m below her window and d = 9.0 m from the

    asked on October 15, 2015
  26. physics

    An object is launched at a speed of 15 m/s. If it rises to a height of 2 m, at what angle was it launched?

    asked on October 15, 2015
  27. chemistry

    "Stomach acid" is hydrochloric acid. A sample of gastric juice having a volume of 6.68 mL required 13.90 mL of 0.0161 M KOH solution for neutralization in a titration. What was the molar concentration of HCl in this fluid? C(HCl) = If we assume a density

    asked on June 14, 2015
  28. chemistry

    A student prepares a solution of hydrochloric acid that is approximately 0.1 M and wanted to determine its precise concentration. A 25.00 mL portion of the HCl solution is transferred to a flask, and after a few drops of indicator are added, the HCl

    asked on June 14, 2015
  29. chemistry

    A 12.6 mL sample of vinegar, containing acetic acid, was titrated using 0.542 M NaOH solution. The titration required 24.1 mL of the base. what is the molar concentration of acid in the vinegar?'

    asked on June 14, 2015
  30. chemistry

    148 mL of 0.325 M MgCl2 is mixed with 68.7 mL of 0.388 M NaOH and allowed to react completely. how many grams of Mg(OH)2 will form?

    asked on June 14, 2015
  31. c

    mixture is prepared by adding 27.0 mL of 0.169 M Na3PO4 to 35.1 mL of 0.234 M Ca(NO3)2. (a) What mass of Ca3(PO4)2 will be formed? (b)What will be the concentrations of each of the ions in the mixture after reaction? Put your answers with 3 significant

    asked on June 13, 2015
  32. chemistry

    '24.6 mL of 0.488 M NaCl is added to 24.6 mL of 0.312 M AgNO3. How many moles of AgCl would precipitate? What would be the concentrations of each of the ions in the reaction mixture after the reaction? Ion Concentration (M) Ag+ M NO3- M Na+ M Cl- M'

    asked on June 13, 2015
  33. chemistry

    23.8 ml of a 2.0 mol/l surfuric acid solution reacted completely with 68.0 ml of potassium hydroxide. find the concentration of potassium hydroxide

    asked on June 12, 2015
  34. chemistry

    23.8 ml of a 2.0 mol/l surfuric acid solution reacted completely with 68.0 ml of potassium hydroxide. find the concentration of potassium hydroxide

    asked on June 12, 2015
  35. chemistry

    Calculate the number of moles of each of the ions in the following solution: 30.8 mL of 0.507 M AlCl3

    asked on June 10, 2015
  36. chemistry

    How many milliliters of water must be added to 153.2 mL of 2.73 M KOH to give a 1.68 M solution?

    asked on June 10, 2015
  37. north seattle college

    2CH3OH + 3O2→ 2CO2 + 4H2O When 9.63 g of CH3OH was mixed with 15.7 g of O2 and ignited, 9.46 g of CO2 was obtained. What was the percentage yield of CO2?

    asked on May 17, 2015
  38. Biology

    I need help with the life cycle of an ostrich! And what could go wrong with the development. I don't understand if it's bacterial or viral infections that may occur...

    asked on October 9, 2014
  39. math

    what is the integral of sin^5(6x)dx

    asked on June 27, 2014
  40. Geometry

    at 10 feet away from the base of a tree, angle the top of a tree males with the ground is 61 degrees. of the tree grows at an angle of 78 degress with the respect to the ground, how tall is the tree to the nearest foot?

    asked on June 1, 2014
  41. Physics

    I'm having trouble setting up/solving this physics problem? Can someone please help me? Thank you. A 4700 kg lunar lander is in orbit 45 km above the surface of the moon. It needs to move out to a 340-km-high orbit in order to link up with the mother ship

    asked on April 4, 2014
  42. Math

    Historically, an acre was the amount of land that an ox could plow in one day, which was deemed to be 4,840 square yards. Supposing that an ox could plow 4,840 square yards in a day, how manyyears would it take an ox to plow a square mile?

    asked on March 26, 2014
  43. Math

    The Brock family uses a 12-cup coffee maker, which leaks. For every 6 cup of coffee brewed, 1/12 cup leaks out. Mrs. Brock makes a full pot. If 4 coffee drinkers receive the same amount, how many cups (use a mixed number) will each individual receive?

    asked on March 26, 2014
  44. Math

    Jan is making a 3-tier wedding cake for 300 guests. She will make the cake for $3 per serving with the following specifications: -Each serving is 4 inch.3 -Each tier must be smaller than the tier below it. -Each square tier is 4 in. tall with a side length

    asked on March 26, 2014
  45. Trigonometry

    Consider the triangle ABC. Suppose that C=69 degrees, a=45 and b= 9 Carry your intermediate computations to at least four decimal places, and round your answers to the nearest tenth. List all solutions A= B= c=

    asked on March 18, 2014
  46. Mathematics

    Suppose that 4 people sit in 4 chairs in a circle. How many different new seating arrangements are possible if each person can move 1 chair to the left or right or remain as is and if 1 person must be in each chair?

    asked on March 12, 2014
  47. Science/Math

    John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200 m, which he covers at 4.5 m/s. At what average speed must Al run to beat John? The textbook that included the

    asked on September 30, 2013
  48. Math/Science

    Wendell invests $10,000 in a stock portfolio made up of Petroleum Special at $30 per share, Newshoe at $12 per share, and Beans and Sprouts at $2.50 per share. He places 60 percent of the money in P.S. (Petroleum Special), 30 percent in N (Newshoe), and 10

    asked on September 30, 2013
  49. Science/Math

    Math Problem page 18 Wendell invests $10,000 in a stock portfolio made up of Petroleum Special at $30 per share, Newshoe at $12 per share, and Beans and Sprouts at $2.50 per share. He places 60 percent of the money in P.S. (Petroleum Special), 30 percent

    asked on September 29, 2013
  50. Science/Math

    Word Problem page 19 John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200 m, which he covers at 4.5 m/s. At what average speed must Al run to beat John? The textbook

    asked on September 29, 2013
  51. Basic Biomechanics

    A sailboat heads north at 3 m/s for 1 hour and then tacks back to the southwest (at 45 degree to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location?

    asked on September 29, 2013
  52. Basic Biomechanics

    John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200 m, which he covers at 4.5 m/s. At what average speed must Al run to beat John?

    asked on September 29, 2013
  53. Basic Biomechanics

    Wendell invests $10,000 in a stock portfolio made up of Petroleum Special at $30 per share, New shoes at $12 per share, and Capital beans and Sprouts at $2.50 per share. He places 60 percent of the money in P.S., 30 percent in N, and 10 percent in B & S.

    asked on September 29, 2013
  54. Biomechanics

    A sailboat heads north at 3 m/s for 1 hour and then tracks back to the southeast (at 45 degrees to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location?

    asked on September 27, 2013
  55. Biomechanics

    John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200m, which he covers at 4.5 m/s. At what average speed must Al run to beat John?

    asked on September 27, 2013
  56. Basic Biomechanics

    Wendell invests $10,000 in a stock por5tfolio made up of Petroleum Special at $30 per share, Newshoe at $12 per share, and Beans & Sprouts at $2.50 per share. He places 60% of the money in P.S., 30% in N, and 10% in B & S. With market values changing (P.S.

    asked on September 27, 2013
  57. math

    The area of a rectangle is 15 + 5y square feet. Which of the following expressions could be the lengths of the sides of the rectangle, in feet? A.5 and 3y B.5 and 3 + y C.5 and 5 + y D.3 and 5 + 3y

    asked on July 16, 2013
  58. luella high

    The area of a rectangle is 15 + 5y square feet. Which of the following expressions could be the lengths of the sides of the rectangle, in feet?

    asked on July 16, 2013
  59. chemistry

    How many grams of ZnCl2 will be produced from 48 grams of zinc and 30 grams of HCL

    asked on March 26, 2013
  60. writing skills

    i need to write a essay on writing skills and writing assignment

    asked on October 31, 2012
  61. Physics HELP

    an object 3.00 cm high is placed 20.0cm from a convex mirror with a focal length of magnitude 8.00 cm. Find the position of the image. (Im using 1over20.00 + 1overQ = 1over-8.00) and the answer is q= -5.71cm. can someone tell how to do the math.. I suck at

    asked on June 16, 2012
  62. statistics

    The Deborah Heart Institute performs many open-heart surgery procedures. Recently research physicians at the Institute developed a new heart bypass procedure that they believe reduces the average length of recovery. The hospital board will not adopt the

    asked on April 18, 2012
  63. Statistics

    Waste Today Services operates a garbage hauling company in a South Jersey city. Each year, the company must apply for a new contract with the city. The contract is in part based on the pounds of garbage hauled. Part of the analysis that goes into the

    asked on April 4, 2012
  64. healthcare administration

    ◦What do you feel are the biggest weaknesses of the health care plan, and why? ◦Be sure to provide 2–3 weaknesses for each group (i.e. providers and patients), and explain your rationale for choosing each by supporting your thoughts with properly

    asked on November 22, 2011
  65. math

    one side of a square is decreased by 20% while its adjecent side is increased by 10%% forming a new rectangle. the area of the new rectangle formed is what percentage of the area of the original square?

    asked on October 18, 2011
  66. relativity

    A particle called neutral pi meson (or pion) decays into two photons (and nothing else).If the pion (whose rest mass is 135Mev) is initially at rest, What are the energies of the photons? How are they moving with respect to each other ?

    asked on June 7, 2011
  67. math

    the lengths of corresponding sides of similar rectangles have a ratio of 7:4 the perimeter of the smaller rectangle is 80 ft. what is the peremiter of the larger rectangle?

    asked on February 4, 2011
  68. science

    You are designing a scale model of the solar system mercury it is 4,878 km in diameter.using the following scale factor, how large does your model of mercury need to be? A. 160cm B. 16cm C.146cm D.30cm

    asked on January 26, 2011
  69. Math

    make a conjecture (obsevations based on patterns) for each sequence below. a)7,10,13,16 b)4,44,444,4444,44444 c)2,10,50,250 d)1,2,6,42,1806,3263442

    asked on December 17, 2010
  70. English

    Devil in the White City Chicago World's Fair benefits and downfalls... I need to write an essay on The Devil in the White City. I read the book and i have a pretty firm grasp on it, but im still having trouble finding events and ideas that occur that

    asked on September 15, 2010
  71. algebra

    When the quotient of a certain number and 6 is decreased by 14, the result is 4 find the number.

    asked on September 6, 2010
  72. Algebra II

    Y=-16X^2+100X+6 where x is the time in seconds and Y is the height in feet. find the zeros of the function? What do the zeros represent and are they realistic? and about how high does the rocket fly before hitting the ground?

    asked on February 14, 2010
  73. com 140 Contemporary Business Communication

    Characteristics of Interpersonal Communication Im having a little problem with this assignment not really sure what to do. There are 2 section on ths assignment 1 is Instructor message and 2 is Class mate message. In each section ther are 4 categories and

    asked on April 8, 2009
  74. arithmetic math

    For each of the following expressions, show each step a student would folow to mentally perform the calculations in the whole numbers. For each step, identify the law, definition , axiom ec that was used to roduce that step. 345+641+255+359

    asked on January 25, 2009
  75. basic math

    say i have something like (2/3)-(1/3) ---------------- 3 do i multiply the top this way (1/3)(3/1) by flipping the denominator or multiply it like this (1/3)(1/3)

    asked on May 15, 2008
  76. trig

    Work out the following identities a)sin pheta / cos pheta b)tan pheta cos pheta

    asked on April 8, 2008
  77. trig

    If a = 5 cm and b = 3cm, use the Pythagorean Theorem to find c

    asked on April 8, 2008
  78. Accounting question..

    Having trouble figuring out how to do this problem for my accounting homework.. any help would be greatly appreciated..the information given goes as follows.. On 1/1/08 you issue $400,000 of 7%, 10 year bonds that pay intrest semiannually. The Market

    asked on November 27, 2007
  79. maths

    solve for x 8=6^x using logs

    asked on November 12, 2007
  80. maths

    solve for x

    asked on November 12, 2007
  81. algebra

    can you show how to solve for x x+1/x + 6/2x-3 =0

    asked on November 1, 2007
  82. maths

    solve the following equation for x (x+1/x) + (6/2x-3)=0

    asked on October 23, 2007
  83. maths

    rearrange the following equation to find x in terms of y and t y(y-x)=3t(3t+x)

    asked on October 23, 2007
  84. algebra

    solve the following simultaneous equation algebraically,for a and b 8a+5b=23 12a+3b=12

    asked on October 23, 2007
  85. chemistry

    if you added sulfuric acid to calcium nitrate what products in addition to calcium sulphate would you get if any ? if you start with calcium nitrate mixed into H2SO4 (aq), wouldn't you get a solution of nitric acid? H2SO4 + Ca(NO3)2 >>> 2 HNO3(aq) +

    asked on August 13, 2007
  86. chemistry

    Given a solution in moles per litre how would you convert to parts per million)ppm.) could you help,no other information given apart from solution contains a known concentation of aluminium mols/L. Convert mols to grams. That will be grams per 1000 mL.

    asked on August 9, 2007
  87. chemistry

    calcium nitrate + sulfuric acid =caso4+? write a balanced chemical equation for this reaction including states. Ca(NO3)2 + H2SO4 ==> CaSO4 + 2HNO3 You don't have enough information to provide states. CaSO4 will be a solid so you write CaSO4(s). H2SO4 will

    asked on July 30, 2007
  88. chemistry

    write a balanced chemical equation for the following reaction including states not complete; no question.

    asked on July 30, 2007
  89. Math

    Show me how to solve problems like this. 1.) 7 + (-9) + (-5) + 6 2.) [(-3)(-4)(-5)]/ (-2)(-3)] Try reading the following sites' pages very carefully. Then make an attempt at doing the problem, and we'll see if you got it right:

    asked on June 6, 2007
  90. math proportions

    17/32 = x/100 1700 = 32x x= 53 1/8 Am I right? yep

    asked on February 25, 2007
  91. Proportional Lengths--Desperate for help!!!

    The lengths in the figure are proportional. In the first figure- 3 on top, and 2 on the bottom In the second figure- 4 1/2 on top, and x on the bottom These are the choices that are written on my assignment. One is the correct answer. A. 4 1/2 B. 3 C. 2

    asked on February 25, 2007
  1. language arts

    jesus christ this page is truly amazing

    posted on February 26, 2020
  2. math

    sx

    posted on January 14, 2020
  3. freedom similes and metaphors?

    Walter

    posted on February 7, 2019
  4. Chemistry

    Acid +metal

    posted on September 25, 2016
  5. physics

    80kg/m³

    posted on June 18, 2016
  6. Economics

    Welfare payment is an amount of money that is paid by the government to some who is poor,ill,or jobless people

    posted on April 24, 2016
  7. Pre- Algebra

    You are right

    posted on March 11, 2016
  8. MATH QUIZ PLS HELP!!!

    Thank you Drew

    posted on March 10, 2016
  9. Help me with this math ms sue.

    Thank you mystery person

    posted on March 9, 2016