Most popular questions and responses by Damon
  1. Chemistry

    C2D3 has a solubility product constant of 9.14×10−9. What is the molar solubility of C2D3? Express your answer with the appropriate units.

    asked on July 28, 2016
  2. physics-force

    A uniform ladder is 10 cm long and weights 400 N. It rests with ists upper end against a frictionless vertical wall. Its lower end rests on the ground and is prevented from slipping by a peg driven into the ground. The ladder makes a 30 degrees angle with

    asked on August 7, 2007
  3. Chemistry

    N2H4 + 2H2O2= N2 + 4H2O What are the mole ratios of hydrazine (N2H4) to hydrogen peroxide (H2O2) and hydrazine to water

    asked on July 14, 2016
  4. Math

    Add the following vector using the Component law. 3 N in a direction 15° south of west and 4 N in a direction 12° east of south.

    asked on December 7, 2018
  5. geometry

    a parallelogram has the vertices (-1,2), (4,4), (2,-1), and (-3,-3). determine what type of parallelogram. find the perimeter and area. i found the parallelogram part and its a rhombus but i cant find the perimeter and area

    asked on December 8, 2011
  6. geometry

    a regular hexagon is composed of 12 congruent 30,60,90 degree triangles. if the length of the hypotenuse of one of those triangles is 18 square root 3 find the perimeter of the hexagon

    asked on December 13, 2011
  7. Math

    What is 3 tens plus 52 and 11? Write your answer in 3 forms.

    asked on January 21, 2018
  8. Chemistry

    How many grams of hydrogen peroxide (H2O2) must be added to 1,500 ml of water to produce a concentration of 1.33 m (molal solution)?

    asked on July 20, 2016
  9. Chemistry

    What volume of nitrogen dioxide (in L) is produced from the complete reaction of 16.87 of lead (ii) nitrate at STP

    asked on July 25, 2016
  10. Chemistry

    How much H3PO4 is needed to neutralize 1 liter of a 0.75M solution of NaOH? (in moles)

    asked on July 26, 2016
  11. Chemistry

    If there are 25 mg of water in a typical drop of water, how many drops of water would react completely with 2 mmol of phenylmagnesium bromide? How do I set up the problem?

    asked on November 9, 2014
  12. math

    a 15 foot long standard weight pipe with a diameter of 4 inches is filled with water. what would be the total approximate weight of the pipe and the water it contains? If I recall my non-metric units, 1 cubic foot of water weighs about 62.4 pounds. the

    asked on August 9, 2007
  13. physics-speed

    i need help with this one thanks A particle starts from rest and is acted on by a net force that does work at a rate that is proportional to the time t. The speed of the particle is proportional to: a. sq. root t b. t c. t^2 d.1/sq. root t e. 1/t Work done

    asked on August 7, 2007
  14. Chemistry

    If the pH of a 0.46 M aqueous solution of a weak base is 9.2, estimate the Kb of the base:

    asked on August 1, 2016
  15. physics

    i need some help wih this, thanks!! Blocks A and B are moving toward each other along the x axis. A has a mass of 2.0 kg and a velocity of 50 m/s ( in the positive x direction ), while B has a mass of 4.0 kg and a velocity of -25 m/s ( in the negative x

    asked on August 7, 2007
  16. check my spanish 3

    escriba la forma del verbo indicado en el tiempo indicado yo/ tener/ futuro My answer is tendré

    asked on August 9, 2016
  17. Math

    At the same store, Peter bought 2 pairs of pants and 5 shirts for $61, and jissica bought 3 pairs of pants and 2 shirts for $64. How much does 1 pair of pants cost? ~Please explain this problem to me

    asked on March 27, 2017
  18. Physics

    An object of mass 1.00kg is moving over a horizontal circular path of radius 2.00m, with a speed of 3.00ms^-1. Determine: (a) its centripetal acceleration (b) its kinetic energy (c) its period (d) its angular velocity

    asked on November 4, 2016
  19. Steve - Damon is not sure!

    Steve, I am not sure about this: http://www.jiskha.com/display.cgi?id=1390496194 Damon

    asked on January 23, 2014
  20. Chemistry

    sample of silver metal is suspected to be contaminated with zinc. A 0.2365 g portion of this metal is dissolved in nitric acid and the silver ions precipitated with excess aqueous NaCl. After filtering and drying, the mass of the precipitate is found to be

    asked on August 2, 2016
  21. Chemistry

    Marcela dissolves 80.0 g of ammonium nitrate in 50.0 mL of water at room temperature and notes that the temperature of the solution decreases by 5.0°C. Which correctly designates the signs of changes of G, S and H for this reaction?

    asked on July 16, 2016
  22. 3rd grade math

    WRITING TO EXPLAIN. How can you use models to show and name the number 1,400 in two different ways? Explain.

    asked on September 11, 2011
  23. Chemistry

    The molar solubility of a generic substance, Mg(OH)2 ksp = (1.2x10^-11) in 0.10 M NH3 Kb = 1.8 x 10^-5 help me please =)

    asked on April 18, 2016
  24. physics

    A steel ball with a mass of 0.65 kg is swinging in a circle with a radius of 1.3 meters at a speed of 17m/s. What is the centripetal force?

    asked on February 20, 2015
  25. physics

    The latent heat of fusion for water is 33.5 × 104 J/kg, while the latent heat of vaporization is 22.6 × 105 J/kg. What mass m of water at 0 °C must be frozen in order to release the amount of heat that 2.32 kg of steam at 100 °C releases when it

    asked on July 30, 2013
  26. Bob Pursley

    I can not copy and paste to the board.

    asked on March 23, 2012
  27. Old -Linear programming - up where it may be found

    Posted by Anonymous on Wednesday, November 26, 2008 at 8:49pm. P=-30x+25y Subject to 2x+3y>=30 2x+y=30 when x = 0, y = 10 when x = 15, y = 0 area above that line is in our region (are you sure your arrow is correct?) second constraint #2 2x+y

    asked on November 27, 2008
  28. jennifer - Grand Canyon

    d = (1/2)g t^2 in feet, seconds units g = 32 ft/s^2 approximately so d = 16 t^2 t^2 = d/16 t = (1/4)(sqrt d) if d = 5280 t = .25 (sqrt 5280) = .25 * 72.7 =18.2 seconds

    asked on October 16, 2008
  29. Julia - Green's theorem

    Sorry, I did not see your question ================================= Posted by julia on Monday, December 10, 2007 at 9:15pm. Can someone show me step by step how to work this problem out please. Let C be the triangle with vertices (0,0), (1,0), and (1,2).

    asked on December 11, 2007
  30. physics

    The distance from earth to the center of the galaxy is about 22500 ly (1 ly = 1 light-year = 9.47 1015 m), as measured by an earth-based observer. A spaceship is to make this journey at a speed of 0.9995c. According to a clock on board the spaceship, how

    asked on August 10, 2007
  31. math

    A bag contains 2 white marbles amd 3 green marbles. Two marbles are drawn at random, one after the other. The first marble is replaced before the second one is drawn. What is the probability that the first marble is green and second one is white?

    asked on March 2, 2017
  32. Chemistry

    Dissolved 0.7500 g calcium chloride dihydrate and impure, in distilled water and the volume was elevated to 200.00 mL in a volumetric flask. A rate of 10.00 mL of the same consumed the titration 18.9 mL 0.0125 M EDTA using CALCON as indicator. What is the

    asked on August 27, 2016
  33. Physics

    A baseball is thrown horizontally from a height of 3.6 meters at a speed of 24 m/sec. How far will it travel along the ground?

    asked on February 20, 2015
  34. Chemistry

    Compare the physical and chemical properties of acids and bases.

    asked on March 4, 2014
  35. Cassie - please check this earlier question!


    asked on January 23, 2014
  36. geometry

    A regular hexagon is composed of 12 congruent 30-60-90 triangles. If the length of the hypotenuse of one of those triangles is 18 square root 3, find the perimeter of the hexagon.

    asked on December 7, 2011
  37. 9th grade

    A collective noun is plural when the group acts as a unit (i.e., "The team lost their fourth game in a row.").

    asked on October 1, 2010
  38. Guido KIRA odds and evens

    KIRA did not have to add the odds and the evens. It was a trick question. Each difference is one. one times five = five

    asked on February 20, 2008
  39. physics

    A film of oil that has an index of refraction equalto 1.45 floats on water (n = 1.33). When illuminated by white light at normal incidence, light of wavelengths 629 nm and 449 nm is predominant in the reflected light. Determine the thickness of the oil

    asked on August 10, 2007
  40. physics

    hi im having trouble with this i think the answer is zero! can u guys double check ty if there are three blocks tied together, with a force enacted on the first block, the net force on the middle block is..... a. zero b. F/3 c. F/2 d. 2F/3 e. F This cannot

    asked on August 6, 2007
  41. chem

    Forty-two grams of benzoic acid is treated with concentrated nitric acid in some sulfuric acid. Forty-two grams of the major expected organic product is isolated. What is the percentage yield for this experiment? Give an equation with structural formulas

    asked on August 6, 2007
  42. Chemistry

    Dissolved 0.7500 g calcium chloride dihydrate and impure, in distilled water and the volume was elevated to 200.00 mL in a volumetric flask. A rate of 10.00 mL of the same consumed the titration 18.9 mL 0.0125 M EDTA using CALCON as indicator. What is the

    asked on August 28, 2016
  43. life orientation ?

    Is it a violation of my human rights to be asked the same question time after time, day after day, week after week until I am ready to scream?

    asked on April 24, 2016
  44. Typos, math, physics

    Would everyone who posted math and physics problems this morning please go back and check for typos? It is difficult to guess what you mean and we do not have your text book.

    asked on June 21, 2015
  45. stastic

    Given the following information about a sample, calculate a z score for a test grade of 91. = 87, s = 4.01 (Points

    asked on April 2, 2015
  46. college stats

    can someone please explain the steps: suppose that the grade point average,denoted by X,of a university student is Normally distributed with the mean 2.786 and standard deviation 0.375 A). a student is on the deans list if her GPA exceeds 3.746. What

    asked on October 1, 2012
  47. Chemistry

    How did the metal atoms become ions? Metal atoms became ions by losing electrons to form positively charged ions(cations). How did the nonmetal atoms become ions? Nonmetal atoms became ions by gaining electrons to form negative ions(anions).

    asked on July 8, 2010
  48. Craig - baloon - calculus moved up

    Posted by Craig on Tuesday, November 25, 2008 at 7:54pm. t: 0 2 5 7 11 12 r'(t): 5.7 4.0 2.0 1.2 0.6 0.5 The volume of a spherical hot air balloon expands as the air inside the balloon is heated. The radius of the balloon in feet is modeled by a

    asked on November 26, 2008
  49. physics

    In the experiment of Lloyd's Mirror, I understand what happens when a light beam is shone on a mirror and reflected, and it is phase shifted by 180 degrees. But what I don't understand is what a phase shift actually is. Can someone explain? The electric

    asked on August 10, 2007
  50. chem

    in the design of parts, it is genarally a good idea to avoid region or points ofstress concentration since these regions are susceptible to corroisn. give examples of the things that can be done to avoid stress raisers. salt(NaCl) is stored in an

    asked on August 9, 2007
  51. physics-intensity

    The intensity of a certain sound wave is 6 ì W.cm2. if its intensity is raised by 10 decibels, the new intensity (in ìW/cm2) is : a. 60 b. 6.6 c. 6.06 d. 600 E. 12 You can calculate this if you wish using logs, but you can do it in your head: 3 db means

    asked on August 7, 2007
  52. math

    Find the binary equivalent of x^8+x^3+x+1 x^1000 + x^11 + x + 1 I just converted the decimal-format exponents to binary format (0's and 1's times powers of 2). The reason you did not get a reply so far is that most of the tutors have probably never heard

    asked on August 7, 2007
  53. chemistry

    There are three xylenes. Their melting points are 13 degrees C, -24 degrees C, and -48 degrees C. Nitration of the isomer with the 13 degree C mp results in only one mononitrated product. The isomer with mp= -24 degree C gives two mononitrated products,

    asked on August 5, 2007
  54. Math

    For what value(s) of r is r^2+5r+6/r+2 equal to 0? A) -2 only B) -3 only C) 3 only D)-2 or -3 E) 2 or 3 I got A but it is incorrect and I'm still confused Thanks

    asked on July 20, 2016
  55. Math

    The separation between goalpost uprights in college football changed from 23 feet 4 inches to 18 feet 6 inches. What percent reduction was this?

    asked on December 5, 2012
  56. Math

    Please help! How do I find the mean weight of 2 groups of 100 kids... 1st grp mean weight is 55.7lbs and 2nd grp mean weight is 42.6lbs.

    asked on December 5, 2012
  57. Algebra


    asked on October 23, 2012
  58. geometry

    I need help on this question. Write the contrapositive,converse,and inverse of the statement.Determine if its true or false.If its false give a coynterexample. If I live in Redlands,then I live in California.

    asked on September 18, 2012
  59. Chemistry

    Name one metal ion that's not multivalent. Hydrogen?

    asked on July 8, 2010
  60. physics-RC Circuit

    We had to do a RC Circuit experiment in the lab one step in the procedure goes as follows: Record the time needed to discharge a capacitor from 10.0 V to 9,8,7,6,5,4,3, and 2 V. Repeat once. The QUESTION BEING ASKED IS: Can you find the time to discharge

    asked on August 10, 2007
  61. accounting

    Credit Policy Review The president, vice president, and sales manager of Moorer Corporation were discussing the company’s present credit policy. The sales manager suggested that potential sales were being lost to competitors because of Moorer

    asked on August 9, 2007
  62. electrical engineering

    Instructions The goal of this project is to design, simulate, build and test a simple speaker system that can connect to a portable audio device such as an mp3 player or laptop. The system has the following requirements: § Accept a standard head-phone

    asked on August 9, 2007
  63. Chemistry

    Dissolved 0.7500 g calcium chloride dihydrate and impure, in distilled water and the volume was elevated to 200.00 mL in a volumetric flask. A rate of 10.00 mL of the same consumed the titration 18.9 mL 0.0125 M EDTA using CALCON as indicator. What is the

    asked on August 26, 2016
  64. algebra 2

    Create a set of data with 5 numbers that satisfy all of the following conditions: 1. the range is 10 2. the mean is 20 3. the median is 22

    asked on August 6, 2016
  65. Algebra 2

    How much larger is the area of the circle enclosed by x^2 + y^2 = 100 than the area of the circle enclosed by x^2 + y^2 = 25?

    asked on August 1, 2016
  66. philosophy

    what philosopher would refute Glaucon's definition of justice in the Republic?

    asked on September 25, 2012
  67. Statistics

    Consider a binomial experiment with 520 trials and 200 successes. To construct a test for a proportion p, what value do we use for the sample test statistic? Round your answer to two decimal places.

    asked on February 26, 2012
  68. math

    make an ordered stem-and-leaf plot of the data, 16.9,17.8,16.3,16.4,17.8,18.1,15.4,16.8,17.1,18.3,15.5,16.2,17.9

    asked on February 16, 2012
  69. ???how do i thank Ms.Sue

    Thank you

    asked on September 11, 2011
  70. History

    Was there any possibility that the British empire could have been repaired after the Intolerable acts?

    asked on October 4, 2010
  71. grammar not grammar

    Driving me crazy

    asked on June 14, 2009
  72. dr wls - physics freak design problem

    wls, If you get a chance could you look at the "a !@#$%^&allenging" problem down a little from here. I am not sure my idea is the best.

    asked on February 10, 2008
  73. accounting

    Forecasting payments; If a firm pays its bills with a 30-day delay, what fraction of its purchases will be paid for in the current quarter? In the following quarter? What if its payment delay is 60 days?

    asked on August 9, 2007
  1. science

    a blue photon is higher frequency, and therefore higher energy, than green. a green photon has enough energy to shake an electron use any extra energy makes the electron go faster so more velocity

    posted on April 18, 2019
  2. Calculus

    That is about year two of calculus meh, suspect AP or college student.

    posted on April 18, 2019
  3. Calculus

    C - x - x^2/2 - x^3/3 ..... as written I would have to say none of the above, but I bet that is an errorr in the assignment.

    posted on April 18, 2019
  4. math

    I guess do the reflection later and the down 2 last by multiplying by -1 60 deg = pi/3 rad, 30 deg = pi/6 rad but I will do your degrees thing 3 sin (k x - 60) when x = 30 , kx is 360 so k = 12 3 sin (12 x - 60) reflect over y axis ?? strange but x ---> -

    posted on April 17, 2019
  5. Calculus

    do you mean 1/n^(r+1) well d is just plain out 1/n^(-100 + 1 ) gets big if r = -2 looks like 1/ n^(-2 + 1) = n hardly if r = -1 1/ (n^0) = 1 that works and so does any bigger r

    posted on April 17, 2019
  6. Math

    You have a typo -10x - 6 < - 4x 12 might mean -10x - 6 < - 4x + 12 ??? if so -10 x < - 4 x + 12 -6 x < 12 now divide by -6, change arrow direction because negative x > -2 =================== check x = 0 should satisfy -10x - 6 < - 4x + 12 -6 < +12 sure

    posted on April 17, 2019
  7. Maths

    35 African docs 50 Africans - 20 women Africans = 30 African men 30 African men - 10 not = 20 African men docs 35 African docs - 20 African men docs = 15 African women docs

    posted on April 17, 2019
  8. History

    Hey, you have to say when. For example do you mean during the Irish potato famine in the 1800s when the Irish flooded the country and signs in the US said "no Irish need apply" or do you mean when the English landed in Virginia and Massachusetts and the

    posted on April 16, 2019
  9. math

    LOL, or n can be negative whole number

    posted on April 16, 2019
  10. math

    The angles whose sin is zero are 0, pi, 2pi, 3 pi, .... n * pi radians or 0 degrees, 180 degrees , 360 degrees .... n * 180 degrees which I suppose you could say is n pi where n can be zero or any positive integer

    posted on April 16, 2019
  11. Physics

    I guess you are to assume the density rho is the same g = G M/R^2 if M = rho V = rho (4/3) pi R^3 then g = G rho (4/3) pi R^3/R^2 = constant * R if the density is constant that would say g earth is 81 times that of the moon HOWEVER as Henry pointed out it

    posted on April 16, 2019
  12. Chemistry

    You have a typo or something. o.752 g per mol of H2 gas Makes no sense to me. A mol of H2 is 2 grams because H has atomic mass of 1 If you want a mol of H2 You need 2/3 of a mol of Al A mol of Al has mass of 27 grams so 2/3 of 27 = 18 grams of Al Remember,

    posted on April 16, 2019
  13. math

    whoops -|2 - 5| is - (3) = -3

    posted on April 16, 2019
  14. Social Studies

    The text certainly supports your answer.

    posted on April 16, 2019
  15. Math

    2 * 5 hours * 3.25 = 32.50 7.50 left over for pizza and Dr Pepper

    posted on April 16, 2019
  16. history

    That depends on if you include the Eastern Empire (is the present Istanbul Roman?) . Check your text or notes.

    posted on April 16, 2019
  17. Science

    I do not think so. What does "humid" mean? What word might be used to describe some region close to the tropics?

    posted on April 15, 2019
  18. Math

    sin(bx+c) = 1/2 bx+c = pi/6 or 5pi/6

    posted on April 14, 2019
  19. Differential equations

    then to continue given f(t) = e^at g(t) then F(s) = (1/a) G(s/a)

    posted on April 13, 2019
  20. Math

    I do not know what that means 9 * e * 89 ? 9 E 89 = 9 *10^89 ? 9 * e ^ 89 = 9 * 2.72..... * 89 ?

    posted on April 12, 2019
  21. math

    Like this ? https://www.jiskha.com/questions/1791655/The-list-shows-the-heights-of-6-students-in-inches-63-70-68-73-58-67-What-is

    posted on April 12, 2019
  22. Math

    May I go do something else now please?

    posted on April 12, 2019
  23. Math

    14 yes 15 yes 16 15!/ 3(12!) = 5*14*13 = 910

    posted on April 12, 2019
  24. Math

    12, yes 13 NO 2^5 =32

    posted on April 12, 2019
  25. Math

    11 yes 2/14*1/13 = 2/91

    posted on April 12, 2019
  26. Math

    10 1/4 *1/3 = 1/12 yes

    posted on April 12, 2019
  27. Math

    9 yes 3/6 *1/6 = 1/12

    posted on April 12, 2019