Questions Asked on
July 18, 2011

  1. Chemistry

    Dinitrogen tetroxide decomposes to nitrogen dioxide: N2O4 (g) ---> 2NO2 (g) Delta H rxn: 55.3 kJ At 298 K a reaction vessel initially containing .100 atm of N2O4. When equilibrium is reached, 58% of the N2O4 has decomposed to NO2. -What percentage of N2O4

    asked by Tyler
  2. Chemistry

    A 0.100g sample of a compound containing C, H, and O is burned oxygen producing 0.1783 g of CO2 and 0.0734 g of H2O. Determine the empirical formula of the compound.

    asked by San
  3. math

    Why do Eskimos wash their clothes in tide? 10 letters (doesn't have to be one word) The answers:Cold out tide,Too Cold Out, Its cold Out, and No tap water don't work.

    asked by Kallie
  4. phy

    A 3.50 kg block on a smooth tabletop is attached by a string to a hanging block of mass 2.80 kg. The blocks are released from rest and allowed to move freely. 1-Is the tension in the string greater than, less than, or equal to the weight of the hanging

    asked by ivan
  5. phy

    A child goes down a playground slide with an acceleration of 1.36 m/s^2. 1-Find the coefficient of kinetic friction between the child and the slide if the slide is inclined at an angle of 28.0 deg below the horizontal.

    asked by pop
  6. English

    in the sentence the man in the back row brought his friends with him what are the parts of the sentence

    asked by Anonymous
  7. math

    Al's Rentals charges $25 per hour to rent a windsurfer and a wet suit. Wendy's charges $20 per hour plus $15 extra for a wet suit. Find the number of hours for which the total charges for bot would be the same. What is the cost?

    asked by Anonymous
  8. phy

    A force of magnitude 7.50 N pushes three boxes with masses m_1 = 1.30 kg,m_2 = 3.20 kg, and m_3 = 4.90 kg .The mass is side by side. 1-Find the magnitude of the contact force between boxes 1 and 2, and 2-Find the magnitude of the contact force between

    asked by susan
  9. chemistry

    will the following solutions be acidic, neutral, or basic? Write the net ionic equation for any reaction that takes place. NH4Cl, KHCO3, LiClO4, NH4NO3, H2CO3, LiClO2, Ba(NO3)2

    asked by chelsea
  10. Calculus

    an open box is made by cutting out squares from the corners of a rectangular piece of cardboard and then turning up the sides. If the piece of cardboard is 12 cm by 24 cm, what are the dimensions of the box that has the largest volume made in this way?

    asked by Andrew
  11. Chemistry

    Consider the rxn during the Haber Process: N2 + 3H2 ---> 2NH3 The equilibrium constant is 3.9 x 10^(5) at 300 K and 1.2 x 10^(-1) at 500 K. Find Delta H reaction and Delta S for reaction

    asked by Tyler
  12. Chemistry

    How many grams of PbCO3 will dissolve in 1.00L of 1.00M H+ is added to 5.00g of PbCO3?? PbCO3(s) + 2H+ (aq) -> Pb2+ (aq) + H2O (l) + CO2 (g)

    asked by San
  13. physics

    Pelicans tuck their wings and free-fall straight down when diving for fish. Suppose a pelican starts its dive from a height of 15.0 m and cannot change its path once committed. If it takes a fish 0.25 s to perform evasive action, at what minimum height

    asked by victor
  14. british literature

    review the metrical feet box on page 35 in your study guis and the model of scanned poem in your textbook page 42. then ,scan the following sonnet 73. mark the syllables, separate the feet with shorts vertical lines, and indicate the rhythem scheme that

    asked by nancy
  15. phys science

    A space shuttle orbits at an altitude of approximately 200km above the surface of the Earth. If the radius of the Earth itself is 6380 km, what’s the acceleration due to gravity at the altitude of the space shuttle?

    asked by josh
  16. Geometry

    Triangle ABC is congruent to triangle XYZ . Angle A measures 50 , angle B measures (2x+40) and angle X measures (4x+8) . Find the value of x.

    asked by kim
  17. Trig

    A bridge is built in the shape of a parabolic arch. The bridge has a span of s= 160 feet and a maximum height of h= 25 feet. Choose a suitable rectangular coordinate system and find the height of the arch at distances of 10, 30, and 50 feet from the

    asked by EVJ
  18. math

    The image of the point (1, -2) after a rotation of 180° about the origin is

    asked by janine
  19. Calc

    A Norman window consists of a rectangle capped by a semi-circular regional. The perimeter of some particular Norman window must be 30 meters. The radius of the semi-circular region is "x" meters. The height of the rectangle is "h" meters. Find the values

    asked by Alex
  20. phy

    A force of magnitude 7.50 N pushes three boxes with masses m_1 = 1.30 kg,m_2 = 3.20 kg, and m_3 = 4.90 kg .The mass is side by side. 1-Find the magnitude of the contact force between boxes 1 and 2, and 2-Find the magnitude of the contact force between

    asked by ana
  21. Chemistry

    determine the number of grams of KCl salt contained in 1.25L of a 5.00%(W/V) KCl(aq)

    asked by Lori
  22. geometry

    A transformation T : (x, y) (x + 3, y + 1). The preimage of the point (4, 3) is

    asked by mattie
  23. chemistry

    Calculate the heat of formationof benzene if the heat of combustion of benzene is 3260 kj/mol, given the following enthalpies of formation of the product. enthalpies of formation for O2= 0k (element) enthalpies of formation CO2 = -394kj/mol enthalpies of

    asked by priya
  24. math

    A manufacturer has a maximum of 240, 360, and 180 kilograms of wood, plastic and steel available. The company produces two products, A and B. Each unit of A requires 1, 3 and 2 kilograms of wood, plastic and steel respectively; each unit of B requires 3, 4

    asked by anonymous
  25. phy

    A 45 kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 22 deg , the crate begins to slide downward. 1-What is the coefficient of static friction between the crate and the ramp? 2-At what angle does

    asked by poul
  26. calculus

    A large soup can is to be designed so that the can will hold 54pi cubic inches of soup. The radius of the can is "x" inches and the height of the can is "h" inches. Find the values for the radius and the height such that the amount of metal needed is as

    asked by Ben
  27. math

    Water is flowing at a rate of 10 m3/s into the cylindrical tank shown below. a) Find the volume V of the water as a function of the water level h. b) Find h as a function of the time t during which water has been flowing into the tank. height of cylinder:

    asked by lou
  28. chemistry

    equilibrium CO(g)+2H2(g)CH3OH(g)calculate these concentrations:CO(g) in an equilibrium mixture containing 0.933mol/L H2 and 1.32 mol?l CH3OH.

    asked by rocky
  29. Scholarship Essay

    Why do I deserve this scholarship? 250 words or less. Any advice on the paragraph itself or on grammar is greatly appreciated. Throughout my life, I have faced multiple obstacles that I have not let hold me back. I am the first person in my family to not

    asked by Angelina
  30. biology

    In Drosophila melanogaster, cut wings (ct) is recessive to normal wings (ct+), sable body (s) is recessive to gray body (s+), and vermilion eyes (v) is recessive to red eyes (v+). All three recessive mutations are X- linked. A female fly with cut wings,

    asked by billy
  31. Math

    Prove each identity: a) 1-cos^2x=tan^2xcos^2x b) cos^2x + 2sin^2x-1 = sin^2x I also tried a question on my own: tan^2x = (1 – cos^2x)/cos^2x R.S.= sin^2x/cos^2x I know that the Pythagorean for that is sin^2x + cos^2x That's all I could do.

    asked by Kate
  32. chemestry

    nitrous oxide (N2O) is used as an anesthetic. the pressure on 2.50 L of N2O changes from 105 k Pa to 40.5 kPa. If the temperature does not change, what will the new volume

    asked by Anonymous
  33. Physics

    A 1200 kg car accelerates to the right at 7m/s2 along a special frictionless track. Determine the magnitude and direction of the force the engine exerts to accelerate the car? A wind blows heavy winds into the car's path.As a result the car's acceleration

    asked by Edward
  34. phy

    When you push a 1.82-{\rm kg} book resting on a tabletop, it takes 2.21 N to start the book sliding. Once it is sliding, however, it takes only 1.52 N to keep the book moving with constant speed. 1-What is the coefficient of static friction between the

    asked by pop
  35. Physics

    A 10 kg block is pushed across a rough surface by a 25N force the block moves at a constant velocity when this force is applied. A) determine the magnitude of the friction force acting on the block B) What is the coefficient of friction between the surface

    asked by Edward
  36. math

    Minimize z = 3x + 6y subject to: 4x + y ? 20 x + y ? 20 x + y ? 10 x ? 0 y ? 0  Graph the feasibility region. Identify all applicable corner points of the feasibility region. Find the point(s) (x,y) that minimizes the objective function z = 3x + 6y.

    asked by anonymous
  37. Chem

    What would a titration curve look like for 25 mL of 0.400 M NH3 (aq) with 0.200 M HCl (aq) -find initial pH -find 1/2 equivalence point pH and volume of HCl required to reach this point -find equivalence point pH and volume required to reach this point

    asked by Sharon
  38. Physics!!

    A centrifuge is a device in which small container of material is rotated at a high speed on a circular path. Such a device is a used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum

    asked by Kelli
  39. algebra

    Write an equation of the line parallel to the line given by 3x-2y=8 and having the same y- intercept as the line given by 2y+3x=-4

    asked by Eugene
  40. Chemistry

    A line in the Lyman series of the hydrogen atom emission results from the transition of an electron from the n=3 level to the ground state level. a) What n level (#) is the ground state level for the hydrogen atom? b) What is the energy of this photon in

    asked by Ashley
  41. phy

    Pulling up on a rope, you lift a 4.05 kg bucket of water from a well with an acceleration of 2.50 m/s^2. 1-What is the tension in the rope?

    asked by lily
  42. Financial Accounting

    ane Doe of Creative Marketing was recording transactions into the accounting records to prepare financial statements for the bank in a loan application. Her expenses were higher than anticipated and she was concerned about the effects on net income. As she

    asked by Trisha
  43. Physics

    15kg block rests on a rough surface (u=.35) a 100N force to the left is applied to the block. what is the magnitude and direction of the net force acting on the block? How quickly will the block accelerate over the rough surface?

    asked by Edward
  44. chemistry

    for the chemical reaction A+B= C+D, the following experimental data were taken to determine the ratelaw equation at 300K. determine the rate law for the chemical reaction. fromthe experiment data i found out the exponetial value... but 300k part confuses

    asked by priya
  45. math

    Maximize z = 16x + 8y subject to: 2x + y ≤ 30 x + 2y ≤ 24 x ≥ 0 y ≥ 0 Graph the feasibility region. Identify all applicable corner points of the feasibility region. Find the point(s) (x,y) that maximizes the objective function z = 16x + 8y.

    asked by ANONIMOUS
  46. algebra

    find the following product: 5x^2y(-4x^5y^4)

    asked by shay
  47. English

    Correctly identifying the part of sppeech of each of the words in the sentences. Example: The boy hit the ball. The (definte article) boy (subject) hit (past tense verb) the definite article) ball (direct object). 1. Mother gave me a card for my birthday.

    asked by Singh
  48. geometry

    How to costruct a parallelogram named HEAR.HE=5cm,EA=6cm and angle R=85 degree.I WANT answer quickly.

    asked by hafees
  49. math

    The point (5, -2) is rotated 90° about the origin. Its image is

    asked by katie 6
  50. phy

    You pull upward on a stuffed suitcase with a force of 150 N, and it accelerates upward at 0.760 m/s^2. 1-What is the mass of the suitcase? 2-What is the weight of the suitcase?

    asked by elis
  51. physics

    a bus is driving through traffic as it makes a number of express stops. the bus drives at a speed of 10 m/s2 for 90 seconds then drives at a speed of 15m/s for 120 seconds before stopping for 30 seconds, then drives at a speed of 5m/s for 60 seconds before

    asked by Edward
  52. physics

    Hi I need to know how much ground water presuure would be required to lift a 1.200m diameter plastic tank weighing 650kg out of the ground please, Please supply the answer in Kpa or psi Cheers

    asked by Spencer
  53. math

    A company is planning to purchase and store two items, gadgets and widgets. Each gadget costs $2.00 and occupies 2 square meters of floor space; each widget costs $3.00 and occupies 1 square meter of floor space. $1,200 is available for purchasing these

    asked by anonymous
  54. math

    A manufacturer has a maximum of 240, 360, and 180 kilograms of wood, plastic and steel available. The company produces two products, A and B. Each unit of A requires 1, 3 and 2 kilograms of wood, plastic and steel respectively; each unit of B requires 3, 4

    asked by ANONIMOUS
  55. english

    write the character sketch of phyllis from the novel "the railway children"by E-nesbit

    asked by wali
  56. Asaudeen seniur high school i.e mathematics

    Find the range of value of x for which 13>3x-23 where all the members are integers

    asked by Dosumu
  57. math

    Deposits of $1,000, $1,100 and $680 were made into a savings account, the first two years ago, the second 18 months ago, the third 6 months ago. How much is in the account now if the interest on all deposits is 12% compounded semi-annually?

    asked by Anonymous*
  58. math

    12-8 3x-5 7x+29 solve show all your work

    asked by keshia
  59. chemistry

    Determine the final pressure of a gas that has an initial pressure of 1.00 atm and is heated from 20 °C to 30 °C. Round to the nearest hundredth. Don't forget the units.

    asked by Izzie
  60. AP HS Chemistry

    I need help. In simple english please, what is Hund's Rule, Pauli Exclusion Principal, and the Aufbau Principal? I need to know these. Please try to be simple as possible because I'm not understanding right now, haha. Thanks!! :)

    asked by Jordan
  61. algebra

    Write an equation of the line containing the specified point and perpendicular to the indicated line. (6,0), 5x+4y=1

    asked by Eugene
  62. algebra

    One of the authors of this text is moderately active, weighs 87kg, is 185cm tall and is 59 yr old. what are his daily caloric needs?

    asked by Mike
  63. math

    2,500(1.65)^12=

    asked by charles
  64. math

    Write an equation of the line parallel to the line given by 3x-2y=8 and having the same y- intercept as the line given by 2y+3x=-4

    asked by keshia
  65. algebra

    Essay. Show all work. Find the following quotient: 36x^2-49y^2 ----------- 6x+7y

    asked by Mike
  66. Chemistry

    I wont to get concentartion by using A weight of chemical material and chemical formula.

    asked by Haider
  67. Calculus

    Find the derivative of: y= 5^x + 15/x^6 I'm assuming I need to take the natural log of each side, but I get stuck after that part.

    asked by Carly
  68. intermediate algebra

    Short Answer. the length of the side of a rectangular desk is given by 2x-6ycm. the length of the front is given by 2x+6ycm. what is an algebraic expression for the area of the top of the rectangular desk? include correct units as part of your answer.

    asked by sheba
  69. Operations Management

    Setup Times Read the case study below “Hi-Ho Yo-Yo, Inc.”. Write a short summary of each of the four methods for selecting the order in which to release the products to printing. Complete a short analysis for each method which provides the average flow

    asked by Gabe
  70. Physics

    two forces act concurrently on a 5kg block resting on a smooth horizontal surface a 5N force making a 40degree angle with the surface and a 10n making a 20degree angle with the surface. A) Determine the magnitude and direction of the net force acting on a

    asked by Edward
  71. Physics

    A spring scale has a spring coefficient of 400 n/m. Determine the mass of an object if it causes the scale's platform to sink .08m.

    asked by Edward
  72. math

    What is the projected population over a period of 340 years in a region which begins with three couples?

    asked by andrew
  73. algebra

    Short answer. find the following product.(x+2)^2

    asked by shay
  74. algebra

    Short answer. find the following product.(y^2-6y+8)(y+8)

    asked by shay
  75. math

    solve: 4+8 1/2 -:- (1/4) to the third power. solve -11-(x+30)=-41-2 (5x-18) please show your work

    asked by keshia
  76. Math

    what is $16,000 at 5% interest amortized over 16 months

    asked by Linda
  77. Amortized Loan

    What is the interest payment on $16,000 at 5% interest amortized over 16 months with $1,000 payment per month

    asked by Linda
  78. math

    (12-8)(3x-5)(7x+29) = solve: show your work

    asked by keshia
  79. health

    Critically DISCUSS 5 WAYS IN WHICH THE SOCIAL OR ENVIRONMENTAL PROBLEM IMPACT ON THE COMMUNITY.PROVIDE RELEVANT SOURCES TO SUPPORT YOUR CLAIM

    asked by Dk
  80. american government

    the presidents roles such as chief executive and commander in chief :

    asked by sue
  81. algebra

    The half-life of 234U, uranium-234, is 2.52 105 yr. If 97.7% of the uranium in the original sample is present, what length of time (to the nearest thousand years) has elapsed

    asked by sissy
  82. algebra

    find the following product: 5x^2y(-4x^5y^4)

    asked by Mike
  83. algebra

    short answer. find the following product -7z(-8z^3+3z^2+8)

    asked by Mike
  84. algebra

    find the following product:(x-3)(x+3)

    asked by Mike
  85. math

    4(x-5)+2+x=3

    asked by Anonymous
  86. intermediate algebraDivide

    Essay: Show all work. A gardener wants to create a rectangular garden with length of 2x-3y ft. and width of x+4y ft. What is an algebraic expression for the area of the garden? Be sure to multiply this out, express in simplest correct mathematical form,

    asked by sheba
  87. math

    4(x-5)-5+6x+7.4-4x

    asked by Anonymous
  88. Calculus

    A manufacturer can produce digital recorders at a cost of 60 dollars each. It is estimated that if the recorders are sold for P dollars a piece, consumers will buy q= 150-p recorders each month. What is the average rate of profit obtained as the level of

    asked by Carly
  89. math

    solve using add. method 4x=-6+5y 8x+4y=-3

    asked by jason
  90. physics

    A race car is able to accelerate at a rate of 14m/s2. After exiting a turn at a speed of 15m/s, the car enters a straightaway and accelerates to a speed of 96m/s just as it reaches the end of the straightaway and enters the next turn. A)how long did it

    asked by Edward
  91. english

    I needed to change my thesis statement(last sentence). It was too long. Please review. Imagine being 6’3” in the eighth grade and everyone in the school making comments about your height. There are definitely advantages and disadvantages to being tall.

    asked by lizzie
  92. Geometry-help please :(

    Construct a truth table for the statement. (p ↔ q) → p

    asked by Jen
  93. Language art

    What is a group of people at a dance with letters bssmyale

    asked by andrea
  94. english

    define this proverb "Hooks are every thing"

    asked by wali
  95. Life orientation

    Identify one environmental factor that causes ill health &disasters in our community

    asked by Identify one environmental factor that causes ill health & disasters in our community
  96. algebra

    Short answer. find the following product. -7z(-8z^3+3z^2+8)

    asked by shay
  97. psychology

    Why would it be helpful if everyone learned something about childhood development?

    asked by Sharon
  98. english

    In the morning, thousands of birds appeared.

    asked by jesse
  99. math

    write an equation of the line parallel to the line given by 3x-2y=8 and having the same y- intercept as the line given by 2y+3=-4

    asked by keshia
  100. math

    A deposit of $2,000 earns interest at a rate of 14% compounded quarterly. After two and a half years the interest rate changes to 13.5% compounded monthly. How much is in the account after six years?

    asked by Anonymous*
  101. arithmetic

    is my answer right? Q) Using a frame rate of 25 fps, what frame number will AviSynth give to the final frame of a 6-second video clip? A. 25*6=150

    asked by Sub
  102. Literature

    Where can I get study questions for the story Julie of the Wolves?

    asked by Max
  103. Math

    Construct a truth table for the statement. (p ↔ q) → p

    asked by Jen
  104. AP CHEM

    Comparing the Noble Gases to the Alkaline Metals, what are major similarities and major difference between the two?

    asked by Jordan
  105. Diatomic Molecules?!

    Why do diatomic molecules form?!! :((

    asked by ashly
  106. math

    If i put 2,500 in a bank account with 6.5% interest rate 12 years ago,how much will be in the account now?

    asked by justina
  107. mechanics

    what is the kinetic energy of an object that has a mass of 20nkilograms and a speed of 2.8 m/s

    asked by tina
  108. business ethics

    2. Reah filed a case against her employer who dismissed her from service for reporting to work under the influence of alcohol. Which of these would be valid reason to contest the dismissal? a.)Reah's employer had not listed reporting to work after

    asked by vedrana
  109. math

    2,500(1.0650)^12=

    asked by tommy
  110. Geometry

    find m_DCB, given angles A and F are congruent, angles B and E are congruent, and m_CDE=26

    asked by Lydia
  111. algebra

    short answer. find the following quotient: x^2-36 ------ x+6

    asked by Mike
  112. math

    4(x-5)-5=6x+7.4-4x

    asked by Anonymous
  113. math

    A transformation T : (x, y) (x + 3, y + 1). The image of B(4, 1) under this transformation is

    asked by leah
  114. math

    a/26-5.5+2a=9/13+20a/13+4/13

    asked by Anonymous
  115. business ethics

    A cookie company's management wants to increase the number of employees belonging to minority groups.They implement a policy determining that a fixed percentage of recruits should be members of groups Which legal constraint is breached by this decision?.A)

    asked by vedrana
  116. us history

    what were some tension over slavery in the 1840's?

    asked by kelly
  117. Statistics

    for 95 out 0f 100 of the same size, a 95% confidence interval of a parameter will include the thrue value of that parameter

    asked by Shak
  118. criminal similation

    what is criminal similation

    asked by john
  119. physics

    A man in manhattan is told that his destination is 26 blocks east at 30 degree angle uptown from where he stood on houston street determine how many blocks east and how many blocks uptown from where he stood.

    asked by Edward