Most popular questions and responses by nat
  1. Chemistry Suspension Examples...

    I need 10 examples of household suspensions for science class tomorrow. I got 10 solutions, 10 colloids, and 10 solvents...but can't figure out 10 suspensions! Help! Suspensions have much larger

    asked on June 15, 2005
  2. physics

    a 330 kg piano slides 3.6 m down a 28 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. the effective coefficient of kinetic froction is 0.4. calculate a) the force exerted by the man, b)the work done

    asked on April 27, 2009
  3. chemistry

    the concentration of urea (MW=60.0g/mol) in a soltuion prepared by dissolving 16g of urea in 39g of H2O is ____ molal

    asked on February 21, 2013
  4. Chemistry

    The formation constant of [M(CN)6]4– is 2.50 × 1017, where M is a generic metal. A 0.170-mole quantity of M(NO3)2 is added to a liter of 1.31 M NaCN solution. What is the concentration of M2 ions at equilibrium?

    asked on May 6, 2014
  5. math

    Peta attempted to solve the following equation. Explain Peta's error. x (x - 5) = 20 x = 20 and x - 5 = 20 x = 20 and x = 25

    asked on February 13, 2015
  6. Chemistry

    Calculate the mass (in mg) of KCN needed to make 500. mL of aqueous KCN solution with a pH of 10.00. The Ka of HCN = 5.0 x 10-10. I got the answer 7.8 mg but it's wrong. Can someone please explain how to do it?

    asked on July 9, 2013
  7. Chemistry

    What would be the pH of a 0.1 M aqueous solution of the phenolate ion, C6H5O–? (Ka for phenol, C6H5OH, is 1.3 x 10–10) I got the answer 5.44 but I think it's wrong. Do I have to subtract it from 14?

    asked on July 6, 2013
  8. Chemistry

    A container is filled with CO2(g) and heated to 1000K. The gas pressure at this temperature is 0.50 atm. Graphite (C) is then added to the container and some of the CO2 is converted to CO according to the reaction below. The final equilibrium total gas

    asked on July 24, 2013
  9. pre calc

    Katie is watching a helicopter flying at an altitude of 5 miles. If the angle of elevation is pi/3 , the distance between Katie and the helicopter is approximately miles. NextReset

    asked on July 19, 2017
  10. Physics

    You are given two unknown point charges, Q1 and Q2. At a point on the line joining them, one-third of the way from Q 1 to Q2, the electric field is zero. Are Q1 and Q2 like or unlike charges? How many times greater is Q2 than on Q1? I am really confused on

    asked on February 22, 2007
  11. physics

    1.0kg bomb explodes into three pieces, A, B, and C A ( 0.3kg) travel along the positive x-axis by 0.3km/s B (0.5kg) travel along the negative y-axis by 04km/s What is the velocity of C?

    asked on November 18, 2018
  12. Chemistry

    A 10.0 mL solution of 0.300 M NH3 is titrated with a 0.100 M HCl solution. Calculate the pH after the addition of 20.0 mL of the HCl solution. (potentially useful info: Ka of NH4+ = 5.6 x 10−10)

    asked on July 17, 2013
  13. Chemistry

    Select the true statement below. A. a spontaneous redox reaction equation will have the stronger oxidizer and stronger reducer as products B. a salt bridge should contain ions that will participate in the redox reaction C. in a voltaic cell, the difference

    asked on August 5, 2013
  14. physics

    two bumper cars in an amusement park ride collide elastically as one approaches the other directly from the rear. car A has a mass of 500kg and carB 600kg, owing to fidderences in passenger mass. if car A approaches at 4m/s and car B is moving at 3.2 m/s,

    asked on April 25, 2009
  15. Physics

    A force of 8.4 N is exerted on a -8.8µC charge in a downward direction. What is the magnitude and direction of the field? How would I set up this problem? Force= Eq solve for E.

    asked on February 22, 2007

    An underwater scuba diver sees the sun at an apparent angle of 45 degrees from the vertical. What is the actual angle of the sun? i don't know how to get the answer but the book says its 19.5 degrees can anyone help me?

    asked on March 26, 2008
  17. PLZ Check My Math?

    Sorry! Another rates/proportions question! "Myles mows lawns during the summer to earn money. Since he is trying to save money for a car, he tries not to spend very much of it. In fact, his goal is to save $5 for every $7 he makes. If Myles made $128 this

    asked on December 17, 2015
  18. Chemistry

    Hello, What is the hybridization of an H atom on a methane? As far as I understand, the hydrogen has 1 s orbital which bonds only to carbon, so does not have any hybridization. Is this correct? Thank you

    asked on July 15, 2010
  19. Chemistry

    Consider the following reaction and select the false statement below. NaI + 3HOCl → NaIO3 + 3HCl A. HOCl is the oxidizing agent B. Cl is reduced C. NaI is the reducing agent D. If ΔG° for the reaction is < 0, then NaI is a stronger reducing agent than

    asked on July 30, 2013
  20. english

    I am trying to find out how many copies of the novel "Brave New World" by Aldous Huxley have been sold worldwide or even in Australia. I can't find the statistics anywhere. Can someone please help??

    asked on March 4, 2010

    Find the circle circumference and circle area with a circles radius 10 inches I think the circles are is 314 but don't know the circumference.

    asked on December 1, 2010
  22. Physics

    a 330 kg piano slides 3.6 m down a 28 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. the effective coefficient of kinetic froction is 0.4. calculate a) the force exerted by the man, b)the work done

    asked on April 25, 2009
  23. physics

    A boy uses a slingshot to launch a pebble straight up into the air. The pebble reaches a height of 29.0 m above the launch point 3.3 seconds later. Assume air resistance is negligible.

    asked on September 22, 2014
  24. science

    scientific notation of 83.1

    asked on February 6, 2011
  25. Math

    My Question is : A plane with an air pf 192 miles per hour is headed on a bearing of 121 degrees. A north wind is blowing ( from north to south ) at 15.9 miles per hour. Find the ground speed and the actual bearing of the plane.

    asked on May 18, 2008
  26. Physics

    1)Three positive particles of charges 9µC are located at the corners of an equilateral triangle of side 15cm. Calculate the magnitude and direction of the force on each charge. 2)What is the electric field strength at a point in space where a proton (m =

    asked on February 22, 2007
  27. Physics

    In a game of pool the cue ball strikes another ball of the same mass and initially at rest. After the collision the cue ball moves at 3.50 m/s along a line making an angle of 22 degrees with its original direction of motion. and the second ball had a speed

    asked on March 8, 2007
  28. Physics

    The electric field midway between two equal but opposite point charges is 1000 N/C, and the distance between the charges is 16.0 cm. What is the magnitude of the charge on each?

    asked on February 22, 2007
  29. math

    24 increased by twice a number z

    asked on September 1, 2015
  30. science

    Oxygen gas may be prepared by decomposing hydrogen peroxide, h2o2, using manganese (IV) oxide catalyst: 2H2O2(liquid) ----> 2H2O(liquid) + O2(gas) Calculate the amount of oxygen that will be produced from 1.35 moles of H2O2 Determine the mass of oxygen gas

    asked on December 8, 2014
  31. Math

    Half of a pizza was broccoli and half was mushroom. George ate 2/3 of the broccoli and 1/4 of thee mushroom part. How much of the pizza did he eat? I did this problem but I wasn't sure of my answer so I needed someone to see if I am right or not. My answer

    asked on March 27, 2017
  32. math

    A brick making company manufactures bricks with the same height and width. the volume of each brick is 108 cubic inches and the base area of each brick is 36 square inches. If the length of a brick is denoted as x and the height and width of the brick is

    asked on March 26, 2015
  33. Math

    Using the ordinary alphabet and allowing repeated letters, find the number of words of length 8 that begin and end with T.

    asked on October 30, 2011
  34. Science

    Name 3 examples of how an abiotic factor could negatively impact an ecosystem:

    asked on June 1, 2014
  35. Math

    Match the expressions with thier equivalent equations in the columns. List A: List B: 6x+12 6(1+x) 6+6x 6x-6 6(x-1) 6(x+2) Fill in the blank: The expression 6x+12 is equivalent to the expression __________ The expression 6+6x is equivalent to the

    asked on March 29, 2017
  36. cpcc

    Two people are pulling a boat through the water as in Figure P4.20. Each exerts a force of 600 N directed at a θ = 45.0° angle relative to the forward motion of the boat. If the boat moves with constant velocity, find the resistive force vector F exerted

    asked on February 20, 2010
  37. Physics

    In a game of pool the cue ball strikes another ball of the same mass and initially at rest. After the collision the cue ball moves at 3.50 m/s along a line making an angle of 22 degrees with its original direction of motion. and the second ball had a speed

    asked on March 6, 2007
  38. Physics

    A football player runs the pattern given in the drawing by the three displacement vectors A, B, and C. The magnitudes of these vectors are A = 5.0 m, B= 15 m, and C = 18 m. Using the component method, find the magnitude and direction è of the resultant

    asked on September 7, 2016
  39. Chemistry

    You have 150 ml of a solution of benzoic acid in water estimated to contain about 5 g of acid. The distribution coefficient of benzoic acid in benzene and water is approx 10. Calculate the amount of acid that would be left in the water solution after three

    asked on November 22, 2010

    Two capacitors, C1=25.0x10^-6 and C2=5.0x10^-6 are connected in parallel and charged with a 100-V power supply. a)calculate the total energy stored in the 2 capacitors b) what potential difference would be required across the same 2 capacitors connected in

    asked on February 4, 2008
  41. science

    10 students whose combined mass is 700 kg ride down 30 m in a elevator. How much thermal energy is produced in the elevator system by the loss in gravitational potential energy of the students

    asked on April 13, 2016

    A wire of initial length Lo and radius rO has a measured resistance of 1.0 ohm. the wire is drawn under tensil stress and to a new uniform radius of 0.25rO. what is the new resistance of the wire? i know the answer is 256 ohm but i have no clue how to get

    asked on February 4, 2008
  43. Calculus

    Find all points of intersection (r,theta) of the curves r=4cos(theta), r=1sin(theta). Next find the area inclosed in the intersection of the two graphs.

    asked on February 11, 2018
  44. English

    I am trying to find an analysis of Oodgeroo Noonuccal's (formerly Kath Walker) poem "No More Boomerang." All i desperately need is the year it was written if you can't find a full analysis. I have looked everywhere. Please help.

    asked on August 22, 2009
  45. math

    Steve is participating in a cross county bike race. Every 2 hours he travels between 42 and 54 miles. Four hours ago, Steve had traveled 56 miles from the start of the race. Which is a reasonable measure of Steve's distance from the start of the race now?

    asked on February 26, 2018
  46. Physics 1

    A disk rotates with constant angular acceleration. The initial angular speed of the disk is 2π rad/s. After the disk rotates through 17π radians, the angular speed is 18π rad/s. (a) What is the magnitude of the angular acceleration? answer in rad/s2 (b)

    asked on October 2, 2014
  47. math

    I need to insert grouping symbols in the expression so that the value of the expression is 14 2x2+3(to the 2nd power)-4+3x5 I have done it in every way and can't get 14

    asked on August 21, 2008
  48. Physics

    I am trying to calculate the distance and speed a van was travelling behind a car when an accident occured in which the van hits the car. I know that the car brakes and skids 24metres, the van behind brakes and skids 6metres. The car was stopped prior to

    asked on May 15, 2008
  49. chemistry

    phenol is insoluble in NNAHCO3 solution while acetic acid is soluble.give reason.

    asked on July 14, 2011
  50. Chemistry

    You have 150 ml of a solution of benzoic acid in water estimated to contain about 5 g of acid. The distribution coefficient of benzoic acid in benzene and water is approx 10. Calculate the amount of acid that would be left in the water solution after three

    asked on November 22, 2010
  51. math 12

    log6=x and log8=y, determine an expression for log3 in terms of x an y.

    asked on October 3, 2010
  52. life science

    in what parts of the plant body would you expect cell division to occur? --i've looked everywhere and couldn't find anything close to an answer!

    asked on October 24, 2008

    A certain kind of glass with index of refraction of 1.65 for blue light of wavelength 430nm and index of refraction 1.615 for red light with wavelength 680nm. If a beam of light containing these two colors has incident angle of 30 degrees what is the angle

    asked on March 27, 2008
  54. Math

    Find the intersection of the following planes: 2x+y+6z=7 3x+4y+3z=-8 x-2y-4z=9

    asked on June 19, 2018
  55. science

    why don't hydrocarbons have hydrogen bonding?

    asked on February 26, 2012
  56. physics

    In Figure P4.30, m1 = 10.5 kg and m2 = 4.5 kg. The coefficient of static friction between m1 and the horizontal surface is 0.60 while the coefficient of kinetic friction is 0.30. Figure P4.30

    asked on February 21, 2010
  57. physics--

    a bell is hanging by a string from your review mirror in the car.while you are accelerating from a stoplight to 28m/s in 6s, what angle does the string make with the vertical? (the bell only feel the car's acceleration through the tension in the string.)

    asked on April 5, 2009
  58. math

    Traffic signs are regulated by the Manual on Uniform Traffic Control Devices​ (MUTCD). The perimeter of a rectangular traffic sign is 106 inches.​ Also, its length is 11 inches longer than its width. Find the dimensions of this sign.

    asked on October 30, 2016
  59. Maths

    factorise 5x^2+8x-6 please help... will be much appriciated.

    asked on February 22, 2014
  60. Chemistry

    The pH of a 0.10 M solution of a certain acid is 3.25 at 25°C. What is the pH of a 0.010 M solution of the same acid at the same temperature?

    asked on July 5, 2013
  61. math

    mystery numbers A = B + 5 B = C + 7 C = THE DIFFERENCE BETWEEN 13 AND 9 D = A - B

    asked on January 19, 2011
  62. Physics

    In stars, nucleons (protons and neutrons) form nuclei of atoms via a series of fusion reactions. If for a particular fusion reaction more energy is given off than is required to make it proceed, does the final nucleus have a higher or lower rest mass than

    asked on May 9, 2009
  63. physics

    What is the momentum of a proton travelling at v = 0.95c in the x-direction in the reference frame?

    asked on May 9, 2009
  64. physics--vectors

    the components of a vector V can be written (Vx,Vy,Vz). what are the components and length of a vector which is te sum of the 2 vectors, V1 and V2, whose components are (8,-3.7,0) and (3.9,-8.1,-4.4)?

    asked on April 5, 2009
  65. Maths

    I have a maths exam tomorrow and am studying with a friend. We are working on a question and are getting two different answers. Could you please show us the right way to do it? 2(4x + 3)(4x - 3) - (4x + 3)squared p.s i couldn't find a squared symbol so

    asked on March 15, 2008
  66. writing

    i need help finding a title for my paper. im writing it about my relationship to a place and i wrote it about my relationship to this small town in new york. i talked about a creek and horse races and how its my second home, but i cant think of a creative

    asked on April 15, 2010
  67. math


    asked on November 7, 2009
  68. data management (gr.12)

    how many different sums of money can you make with a penny, a dime, a one-dollar coin, and a two-dollar coin?

    asked on February 23, 2009
  69. Math

    A trough has width w=4ft, length L=19ft, and height h=7ft. Find the work to pump all of the water over the top of the trough with units.

    asked on February 14, 2018
  70. Sociology

    What can be the relationship between Social Darwinism and Poverty?

    asked on October 5, 2017
  71. Math

    What is 1 7/12 - 3/20 equal to? I tried to do this question but I couldn't quite get the answer. For the directions of the work, its says use the least common multiple as the denominator and when I came across this one, I couldn't quite get the answer. If

    asked on March 27, 2017
  72. physics

    How long would a car take to go from 39.3 m/s to 12.4 m/s with an acceleration of 2.8 m/s2?

    asked on October 6, 2016
  73. Physics

    I need to explain and demonstrate mathematically why it is easier to pull a wheelbarrow than it is to push it

    asked on October 9, 2013
  74. Calculus

    Find the Taylor Polynomial of order 1 for the function f(x)=arctan(x/5) in powers of (x-5). Also find the remainder R1(x) as a function of x and c.

    asked on June 19, 2013
  75. math

    what is value of 7 in each number 127 473

    asked on September 27, 2010
  76. Chem

    Hello, In the addition of water to an alkene (e.g. ethylene) what is the electrophile? Well I thought its the hydrogen cation from the water. Since electrophiles are electron poor molecules, having a tendency for more electrons. But then it asks what

    asked on July 22, 2010
  77. Math 9th grade

    x^2 + 5x +6/ x^2 - 3x -10 How do I do this? Is it asking me to divide? The answer choices are as following: A)x + 3/ x - 5 , x ≠ 5 B)x + 3/ x - 5 , x ≠ -2, 5 C)x2 + 5x + 6/ x - 5 , x ≠ 5 D)x2 + 5x + 6/ x - 5 , x ≠ -2, 5

    asked on May 4, 2010
  78. physics

    consider 2 inertial reference frames, A and B, where B (a train) is moving with constant velocity, 10kn/h, in the positive x direction with respect to A.(a person standing on the station platform). if another person is throwing a ball on the train (ie in

    asked on April 5, 2009
  79. English

    I am trying to find out who (or which companies) own Australian channels 7,9 and 10 and also SBS. I have looked on various websites all with different anwsers. Can someone please help me find the correct answer. Thanks.

    asked on January 30, 2009
  80. Maths

    Just need a bit of help understanding what exactly i have to do here to work this out. Rearrage the following equation and hence state the gradient and the y-intercept. 2y = 8x + 10 Do i just go: y = mx + c 2y = 8x + 10 y = (8x + 10) /2 y = 4x + 5 or do i

    asked on January 27, 2009
  81. Geography

    I am doing an assignment on fire ants for Geography. I need a map showing the current location of the ants in Australia and a map of where they were first discovered. I have tried a million websites with every combination of words possible. Can someone

    asked on April 1, 2008
  82. Economics

    Can someone please explain what factors affect a country GDP? Also, if Thailand has a GDP of 4.5% and Australia has a GDP of 2.8%, please explain which country has a better economy. Thanks for your help

    asked on September 8, 2007
  83. Geography

    I have an assignment to do comparing Thailand and Australia economically. I don't understand how the GDP, inflation, unemployment and currency rate are linked. For example if inflation is high, what is the expected GDP (low or high). Can someone please

    asked on August 23, 2007
  84. Physics

    In a game of pool the cue ball strikes another ball of the same mass and initially at rest. After the collision the cue ball moves at 3.50 m/s along a line making an angle of 22 degrees with its original direction of motion. and the second ball had a speed

    asked on March 6, 2007
  85. Physics

    What is the repulsive electrical force between two protons in a nucleus that are 5 x 10^ -15 m apart from each other? Could you help me with this problem? I can't figure out how to do this. Use Coulomb's equation F= kQQ/r^2

    asked on February 22, 2007
  86. MAth

    A punch recipe says to mix 4 cups of pineapple juice, 8 cups of orange juice, and 12 cups seltzer to make 18 servings. how many cups do you need of each to make 108 servings

    asked on October 15, 2018
  87. Physics

    A 6.2 kg model rocket is traveling horizontally and due south with a speed of 20.3 m/s when it explodes into two pieces. The velocity of one piece, with a mass of 1.6 kg, is v1 = (-12 m/s)i + (30 m/s)j + (15 m/s)k, with i pointing due east, j pointing due

    asked on February 24, 2014
  88. Physics

    I need to know whether the position of the CG is higher, lower, or at the same level within the body when a person is standing up as when a person is lying down? Why or why not?

    asked on October 9, 2013
  89. Microeconomics

    Producing paper creates pollution. The efficient quantity of paper is when the A. marginal social benefit of paper is equal to zero. B. marginal social cost of the pollution from making paper is equal to zero. C. marginal social of paper is equal to the

    asked on August 5, 2013
  90. business law

    1. Meyer, after seeing a sign on Chosnyka's land reading "FOR SALE 95 ACRES" and running a title search, sent Chosnyka an offer to buy the land as described by its legal description. The offer required acceptance by returning a singed copy within 10 days.

    asked on March 18, 2012
  91. marketing

    a 1,400- to 1,750-word paper in which you describe the elements of the marketing mix (product, place, price, and promotion). Use at least 3 academic sources (non-academic sources or text materials will not be counted) to support your work. In addition,

    asked on March 5, 2012
  92. math


    asked on October 5, 2011
  93. math

    write the question for the answer below. about 320

    asked on January 25, 2011
  94. Math

    For y = a sin x 'a' is called the amplitude. What effect does 'a' have on a graph ??? Please help if you can .

    asked on October 9, 2009
  95. math

    write a word problem for 1/2 - 2/3 = and write a word problem for 5/12 - 1/3 =

    asked on August 28, 2009
  96. Math

    without finding the exact answer select which of the following numbers is the best estimate of each sum or difference and justify your choices: - 2/3, 0, 2/3 1/9 + 2/5 - 1/3 - 3/4

    asked on August 28, 2009
  97. english

    I need to find a strong verb for these weak verbs: slowly sat down laughed hard

    asked on February 4, 2009
  98. Geography

    I need a map for a report showing where the fire ant was first introduced into Australia and where it has spread since. I have looked on a million websites and can't find a single thing. Can you help please?

    asked on March 27, 2008
  99. Min Pin Refuses to Heel

    Saw some1 else had posted a dog training qu. & visited both websites (nothing unfortunately). Does any1 know how i can get my Miniature Pinscher mix to heel on his walks? I've looked at every website i could think of and came up with nothing. Thnx 4 ur

    asked on January 2, 2016
  100. chemistry

    How much 35.6 M H2SO4 is needed to make a 1 L solution that is .007 ppm? Not sure how to convert from M to ppm-is there a formula?

    asked on June 10, 2015


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