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. calculus

    What is the equation of the line L that passes through the point (1, −1) and has an angle of inclination of 60°? - im inclined towards y=√3 x −1−√3 as the answer, am i correct

    asked on August 13, 2019
  3. 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
  4. 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
  5. 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
  6. 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
  7. chemistry

    Concentrated hydrochloric acid has 37.5% of HCl in mass and density of 1.2 g/cm3. What volume (in mL) of concentrated hydrochloric acid should be used to prepare 7 L of a 0.8 mol/L HCl (aq) concentration solution?

    asked on May 16, 2019
  8. 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
  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

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

    asked on July 8, 2010
  11. 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
  12. 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
  13. math

    I need help: The value of a new car decreases dramatically as soon as it leaves the dealership. Assuming that you just bought a new car with $20,000 and that it depreciates at a rate of 2% a month. How much will the car be worth in one year?

    asked on May 21, 2020
  14. chemistry

    From a hydrogen peroxide (diluted in water) a sample of 1.00 g is removed, acidifing it with H2SO4 and then titrated with a solution of 0.20 M of KMnO4, requiring 17.6 mL of KMnOH. What is the percentage of H2O2 contained in the bottle?

    asked on July 8, 2019
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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
  22. Algebra


    asked on October 23, 2012
  23. 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
  24. 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
  25. 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
  26. 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
  27. 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
  28. Physics/Engineering

    The heel on a pair of women’s shoes tapers from a radius of 1.75 cm down to a radius of 0.50 cm at the bottom. If 50% of the weight of a 600 N woman is supported by each heel, find the stress on each heel. Submit your answer in MPa.

    asked on February 28, 2020
  29. chemistry

    Sodium chloride salt (NaCl) has a solubility coefficient equal to 55g/100g of water at 25 ° C. If we add 15g of salt to 100g of water what kind of solution are we forming? Formation of any precipitate?

    asked on September 16, 2019
  30. chemistry

    Consider a mixture of 50% water and 50% of mass ethanol, whose relative density is equal to 0.9138. Get the mass of ethanol contained in 100m3 of mixture.

    asked on September 9, 2019
  31. Chemistry

    John Roger's Stephens left a 3.5 kg iron shovel outside through the winter. The shovel now orange with rust, is rediscovered in the spring. It's mass is 3.7kg. How much oxygen combined with the iron?

    asked on September 9, 2019
  32. chemistry

    The acidity of a water with initial pH of 5.5 was tested using the following procedure: The pH of a volume of 50.00 mL water sample was adjusted to 4.0 using 5 mL 0.1 N H2SO4 solution. Then this sample was titrated using 0.2 N NaOH. After addition of 7 mL

    asked on July 13, 2019
  33. chemistry

    S8 (rhombic) + 12 O2 (g)-----> 8 SO3 (g) + 752.0 kcal In the reaction above equated, performed at 25 °c and 1 atm, the formation enthalpy of the SO3 (g) is equal to: a) +752,0 kcal b) -752,0 kcal c) +773,0 kcal d) -94,0 kcal e) +94,0 kcal

    asked on July 8, 2019
  34. chemistry

    Which masses of HNO3 nitric acid and water should be mixed to prepare 1000 grams of UAM 8% solution in mass of HNO3?

    asked on June 4, 2019
  35. chemistry

    Why does an aqueous solution of 0.10 mol/kg of NaCl have a higher boiling point than a 0.10 mol/kg aqueous C6H12O6?

    asked on June 1, 2019
  36. chemistry

    What is the concentration, in parts per million (ppm), of an aqueous solution of copper sulfate II (CuSO4) at 12% by weight?

    asked on May 24, 2019
  37. chemistry

    A chemist has a solution of NaOH 4 mol/L and wishes to prepare 500 mL of a Solution at 3 mol/L. What volume should it use from the 4 mol/L solution?

    asked on May 6, 2019
  38. chemistry

    A sample of 30.695 g of limestone (calcium carbonate) is heated at high temperature and decomposes according to the calcination reaction After a warm-up, the limestone suffered complete decomposition and after the cold was weighed and indicated 30.14 g .

    asked on April 23, 2019
  39. Math

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

    asked on January 21, 2018
  40. 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
  41. 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
  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. 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
  44. 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
  45. 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
  46. 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
  47. Chemistry

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

    asked on July 26, 2016
  48. 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
  49. 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
  50. 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
  51. 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
  52. 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
  53. 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
  54. 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
  55. 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
  56. 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
  57. Chemistry

    Compare the physical and chemical properties of acids and bases.

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


    asked on January 23, 2014
  59. 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
  60. 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
  61. 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
  62. philosophy

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

    asked on September 25, 2012
  63. 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
  64. Bob Pursley

    I can not copy and paste to the board.

    asked on March 23, 2012
  65. 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
  66. 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
  67. 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
  68. ???how do i thank Ms.Sue

    Thank you

    asked on September 11, 2011
  69. 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
  70. History

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

    asked on October 4, 2010
  71. 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
  72. 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
  73. grammar not grammar

    Driving me crazy

    asked on June 14, 2009
  74. 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
  75. 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
  76. dr wls - physics freak design problem

    wls, If you get a chance could you look at the "a bit challenging" problem down a little from here. I am not sure my idea is the best.

    asked on February 10, 2008
  77. 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
  78. 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
  79. 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
  80. 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
  81. 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
  82. 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
  83. 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
  84. 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
  85. 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
  86. 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
  87. 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
  88. 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
  1. Algebra

    first one only, you do the rest note the middle point (0,-1) works for all the equations, y = -1 for any x now the first point (-1 , -8) A , -3 - 4 - 1 = -8 ok so far B , -2 - 5 - 1 = -8 ok so far C , -3 -10 -1 =-14 no way D , -5 - 8 - 1 = -14 no way so it

    posted on August 12, 2020
  2. mathematics

    I assume you mean 90 degrees so right triangle and a^2 + b^2 = c^2 sin A = a/c sin B = b/c sin A sin B = a b/ c^2 = a b /(a^2+b^2)

    posted on August 12, 2020
  3. mathematics

    about 9/10

    posted on August 11, 2020
  4. Math

    1/2 * 2/1 = 1

    posted on August 11, 2020
  5. Physics

    no static friction coef is GREATER than sliding.

    posted on August 10, 2020
  6. Physics

    component of mg down slope = component of m * centripetal acceleration down slope m g sin 22 = (m v^2/R) cos 22 g tan 22 = v^2/R v^2 = g R tan 22 solve for v T = circumference / v = 2 pi R / v

    posted on August 9, 2020
  7. Physics


    posted on August 8, 2020
  8. mathematics

    child = p woman = 3 p man = 5 p +7 (pretty fat) sum= p + 3 p + 5 p + 7 = 9 p + 7

    posted on August 7, 2020
  9. Physics

    The skater spins slower because his rotational MOMENT OF INERTIA has increased. Angular momentum is conserved. L =angular momentum = I * omega = Moment of inertia * angular velocity Moment of inertia = sum of all the masses times square of distances from

    posted on August 7, 2020
  10. Physics

    The iron piece exerts a force of 1 N on the magnet in the opposite direction. SAME PROBLEM If the magnet pulls the iron up, the iron pulls the magnet down.

    posted on August 7, 2020
  11. Physics

    Newton 3 is about equal and opposite ! The nail exerts an equal force on the hammer in the opposite direction. If I push the nail forward it pushes BACK on me,

    posted on August 7, 2020
  12. mathematics

    w = x^2 - 6 L = w+2 = x^2 - 4 P = 2 L + 2 w = 2 (x^2-4) + 2 (x^2-6) = 2 x^2 - 8 + 2 x^2 - 12 = 4 x^2 - 20

    posted on August 7, 2020