Questions Asked on
July 18, 2012

  1. Chemistry

    About 13% of the acid in a 0.10M solution of a weak acid dissociates to form ions. What is the H3O+ concentration? What is the OH- concentration? What is the pH of the solution?

    asked by Sara
  2. math

    Total hours: 42 (including 4 hrs sick leave, 6 hrs travel) Week 2 — Total hours: 46 (including 5 hrs travel)What percentage of the recorded time did the worker spend traveling?

    asked by nita
  3. math

    Suppose you are looking to buy a $5000 face value 26-week T-bill. If you want to earn at least 1% interest, what is the most you should pay for the T-bill?

    asked by mary
  4. Physics

    A 2600 kg truck traveling at 72 km/h slams on the brakes and skids to a stop. The frictional force between the truck and the road is 8200 N. Calculate the mechanical work required to stop the truck and the distance the truck travels before stops.

    asked by Jack Hill
  5. math

    suppose you are looking to buy a $5000 face value 26 week T-bill. If you want to earn at least 1% interest what is the most you should pay for the T-bill

    asked by Anonymous
  6. Physics

    Consider the following four possibilities for two point charges and choose the one(s) that do not change the magnitude of the electrostatic force that each charge exerts on the other: A. Double the magnitude of each charge and double the separation between

    asked by Patrick
  7. Chemistry

    A) A compound distributes between water (solvent 1) and benzene (solvent 2) with Kp = 2.7. If 1.0g of the compound were dissolved in 100mL of water, how much compound could be extracted by three 10-mL portions of benzene? B) If the value of Kp is 0.5 for

    asked by Anonymous
  8. physics

    Jason applies a force of 4.00 newtons to a sled at an angle 62.0 degrees from the ground. What is the component of force effective in pulling the sled horizontally along the ground?

    asked by Jay
  9. Algebra

    A plane traveled 580 miles to Anakara and back. The trip there was with the wind. It took 5 hours. The trip back was into the wind. The trip back took 10 hours. Find the speed of the plane in still air and the speed of the wind.

    asked by Taurus
  10. maths

    Ten blackberry plants started growing in my yard. Absent constraint, blackberries will spread by 200% a month. My yard can only sustain about 50 plants. Using the logistic growth model, a. Write a recursive formula for the number of blackberry plants in my

    asked by mary
  11. maths

    Marie can afford a $250 per month car payment. She’s found a 5 year loan at 7% interest. a. How expensive of a car can she afford? b. How much total money will she pay the loan company? c. How much of that money is interest?

    asked by colin
  12. math

    Use a table of trigonometric values to find the angle è in the right triangle in the following problem. Round to the nearest degree, if necessary. cos è = 0.8192 A = 45 H =?

    asked by Taylor
  13. math

    A native wolf species has been reintroduced into a national forest. Originally 200 wolves were transplanted. After 3 years, the population had grown to 270 wolves. If the population grows exponentially, a. Write a recursive formula for the number of wolves

    asked by Anonymous
  14. chemistry

    The normal boiling point of ethanol is 78.5C. Using the following information: delta H formation (C2H5OH (g))= -234.38 kJ/mol determine the enthalpy of vaporization of ethanol. I know it should be around 39.3 according to a table in my textbook, however, I

    asked by Kellie
  15. maths

    You deposit $10,000 in an account earning 4% interest compounded monthly. a. How much will you have in the account in 25 years? b. How much interest will you earn?

    asked by mary
  16. Chemistry

    C3H8 + 5O2 --> 3CO2 + 4H2O what are the oxidation #'s of each? What is being oxidized? reduced? Please explain

    asked by Me
  17. Math

    Solve for the length of the unknown side in the following right triangle. (Side AC is the hypotenuse.) Round your answer to two places, where applicable. Side AB ? Side BC=12 Side AC=19

    asked by Jim
  18. maths

    The population of the world in 1987 was 5 billion and the annual growth rate was estimated at 2 percent per year. Assuming that the world population follows an exponential growth model, find the projected world population in 2015.

    asked by Anonymous
  19. Chem

    How long must a current of 1.20 A pass through a sulfuric acid solution in order to produce 25.0 mL of H2 gs at 25 degrees C and 1 atm pressure?

    asked by Josh
  20. US History

    1.Which of the following statements about Woodrow Wilson is true? A) He wanted to place strict government controls on corporations. B) He overturned discriminatory laws against African Americans. C) He advocated eliminating the income tax. D) He opposed

    asked by victoria
  21. Science

    container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?

    asked by Jack Hill
  22. chemistry

    How many moles of NaOH must be added to 1.00L of this solution to increase the PH to 9.25?

    asked by Heather
  23. Science

    A car's engine is only 12% efficient at converting chemical energy in gasoline into mechanical energy. If it takes 1.8 x 104 N of force to keep the car moving at a constant speed of 21 m/s, how much chemical energy would be needed to move the car a

    asked by Rob
  24. maths

    How much would you need to deposit in an account now in order to have $20,000 in the account in 4 years? Assume the account earns 5% interest.

    asked by colin
  25. Chemistry

    How much 0.300 M NaOH is required to completely neutralize 30.0 ml of 0.15 M HClO4 Clue: M1V1=M2V2

    asked by Ann
  26. maths

    You deposit $1000 each year into an account earning 8% compounded annually. a. How much will you have in the account in 10 years? b. How much total money will you put into the account? c. How much total interest will you earn?

    asked by colin
  27. chemistry

    1) a student used 3.50 g of salicylic acid. calculate theoretical yield 2) the actual yield (from experiment) was found to be 1.50 g less than the theoretic yield (mass), calculate the percent yield 3) t

    asked by ama
  28. History.

    How did the role of the federal government change during the Progressive Era of the early 1900s. Include specific progressive legislation, discuss presidents and the enhanced power of the federal I need some help with finding some information and

    asked by Katie
  29. Science

    A car's engine is only 12% efficient at converting chemical energy in gasoline into mechanical energy. If it takes 1.8 x 104 N of force to keep the car moving at a constant speed of 21 m/s, how much chemical energy would be needed to move the car a

    asked by Bob
  30. Physics

    There are four charges, each with a magnitude of 2.65 microcoulombs. Two are positive and two are negative. The charges are fixed to the corners of a 0.408-m square, one to a corner, in such a way that the net force on any charge is directed toward the

    asked by JJ
  31. US Government

    Why do we have more safeguards for accused criminals than the victims themselves?

    asked by alex
  32. Updated Math Question

    The radius of circle A is 9 times greater than the radius of circle B. Which of the following statements is true? A.The area of circle B is 9 times greater than the area of circle A. B.The area of circle A is 9 times greater than the area of circle B C.The

    asked by Kim
  33. Calc

    After its fastest rate of growth ever during the 1980s and 1990s, the rate of growth of world population is expected to slow dramatically in the twenty-first century. The function G(t) = 1.58e−0.213t gives the projected annual average percent population

    asked by Jim
  34. math

    you deposit $10000 in an account earning 4% interest compounded monthly. how much will you have in 25 years? how much interest will you earn

    asked by Anonymous
  35. physics

    A 5 g bullet is fired into a 2 kg wooden block attached to a spring with a force constant of 20 N/m. It lodges in the block, and the block and bullet compress the spring until they come to a rest. If the bullet was moving at 1000 m/s just before the

    asked by shawn
  36. geometry

    Find the similarity ratio and the ratio of perimeters for two octagons with area 18 square inches and 50 square inches

    asked by larry
  37. Physics

    A student applies a force of magnitude 39.0 N at an angle of 22.6o with the horizontal to push a 4.00-kg textbook 1.00 m across a table from rest to a final speed of 1.75 m/s. Find the work done by friction on the textbook.

    asked by Rob
  38. physics

    A vertically hanging spring has a mass of 50 N hanging from it. Under these conditions, the spring stretches 10 cm. The spring is then placed on a horizontal table and stretched 20 cm. What force is required in the second scenario?

    asked by kyle
  39. Physics

    The force of gravity on the moon is said to be 1/6th of that on the earth .what would be the mass of 12kg weighed on the surface of the earth and moon

    asked by Bhumika Gireesh
  40. History

    Social Darwinists believed that A) a large empire was the key to economic growth. B) the best country would win any international competition. C) each nation should be made up of only one ethnic group. D) military might was the most important measure of a

    asked by Anonymous
  41. Chemistry

    How much 0.300 M NaOH is required to completely neutralize 30.0 ml of 0.15 M HClO4 Clue: M1V1=M2V2 I still don't get it to i times .300x30.0 then times .300 x.15 i just don't understand what i am actually suppose to multiply

    asked by Ann
  42. critical thinking

    Please post a substantive response to the following discussion questions by clicking on Reply: Think about the following stereotype. Would they invoke the same kind of images for everyone? Which are negative and which are positive? How do you think they

    asked by Anonymous
  43. maths

    How much money will I need to have at retirement so I can withdraw $60,000 a year for 20 years from an account earning 8% compounded annually? a. How much do you need in your account at the beginning b. How much total money will you pull out of the

    asked by colin
  44. Chemistry

    so would my answer be 15ml How much 0.300 M NaOH is required to completely neutralize 30.0 ml of 0.15 M HClO4 Clue: M1V1=M2V2

    asked by Ann
  45. Statisics

    The state lottery claims that its grand prize is $1 million. The lucky winner will receive $50,000 upon presentation of the winning ticket plus $50,000 at the end of each year for the next 19 years. Why isn't this really a million-dollar prize? What would

    asked by Val
  46. Macro economics

    Suppose that the residents of Veggieland spend all of their income on cauliflower, broccoli, and carrots. In 1998 they buy 100 heads of cauliflower for $200, 50 bunches of broccoli for $75, and 500 carrots for $50. In 1999 they buy 75 heads of cauliflower

    asked by Anonymous
  47. English

    Instead of toilet training her son at 18 months of age as her mother recommends, Melissa is waiting until her son is emotionally ready to begin toilet learning. How will Melissa know when her son is emotionally ready?

    asked by Bella
  48. Calc

    The percentage of a certain brand of computer chips that will fail after t years of use is estimated to be P(t) = 100(1 − e−0.1t ). What percentage of this brand of computer chips are expected to be usable after 6 years? (Round your answer to one

    asked by Jim
  49. geometry

    determine the coordinates of the midpoint of the line segment whose endpoints are A(0, 2, 4) and B(-8, 2, -6)

    asked by Bread
  50. algebra

    At an auto show, a car dealer asked the first 10 visitors their ages and the kinds of cars they own. The Venn diagram shows the details. A Venn diagram titled Ages of Car Owners, indicating the ages of owners of each type of car. Each of the three circles

    asked by Anonymous
  51. Calculus

    Find the point on the graph of function that is closest to the point. f(x)=x^2 (2,1/2)

    asked by Elizabeth
  52. statistics

    So if a scale has 30 items in it, and if an individual gets a score of 20 what does this mean? The only way to answer this is to look at the standardization sample, find out what the mean score in the sample was, let's say 15, and standard deviation in the

    asked by phil
  53. Chemistry

    What is the HCl concentration if 72.1ml of 0.035M NaOH is required to titrate a 20.0ml sample of the acid?

    asked by Sara
  54. Physics

    container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?

    asked by Rob
  55. chemistry

    3) The melting point range of an unknown substance was determined to be 120-180 degree celcius. what can you tell about the purity of the unknown

    asked by ama
  56. english

    Do you think that paying attention to your audience, purpose, and content improves the influence of your writing? Why or why not?

    asked by ann
  57. Healthcare Finance

    Metropolis Health System has received a wellness grant from the charitable arm of an area electronics company. The grant will run for twenty-four months, beginning at the first of the next fiscal year. Two therapists and two registered nurses will each be

    asked by Brenda
  58. MAth

    What is the area of a parallelogram with a base of 25 meters and a height of 8 meters?

    asked by shailene
  59. Trigonometry

    Find the value of x on this right triangle when a=20 b=5x-10 and c=2x(Square root of 5) A. x = 15 B. x = 10 C. x = 12 D. x = 16 A wheel 5.00 ft in diameter rolls up a 15.0° incline. How far above the base of the incline is the top of the wheel after the

    asked by Anonymous
  60. Calc

    Compute the derivative of f(x)=5^x^2+1 using logarithmic differentiation.

    asked by Jean
  61. Physics

    A 1.20kg ball is rolled down a frictionless ramp whose top is 0.80m above a horizontal spring with ks = 800N/m. The ball reaches the horizontal just in front of the spring. a.) What is the kinetic energy of the ball just before it contacts the spring? b.)

    asked by Lauren
  62. statistics

    So if a depression scale has 30 items in it, and if an individual gets a score of 20 what does this mean? The only way to answer this is to look at the standardization sample, find out what the mean score in the sample was, let's say 15, and standard

    asked by phil
  63. statistics

    If the null hypothesis for the example survey posted is "There is no correlation between level of drug use and satisfaction with one's personal life." What are the three possible alternative hypotheses that could be stated, using only the variables and

    asked by Trip
  64. math

    The lengths of two adjacent sides of a square are represented by 5x+11 and 7x-3. What is the perimeter of the square?

    asked by Tempie
  65. maths urgent please

    Hi, a particle is moving in simple harmonic motion such that a = -4x. ( x in metres, t in seconds) Find the maximum speed at which the particle is travelling. Velocity = 6cos2t. My teacher said to put t = 0 and sub it into velocity equation above, but I

    asked by Michelle
  66. Law

    Why do some believe cell phone while driving should be banned? how is it any different than talking to the people on the passenger's side or driving with you?

    asked by Jazme
  67. Ethics

    you have examined four approaches to explaining criminal behavior: classical, positivist, structural, and ethical. Select and research one of those approaches. Identify the strengths and weaknesses of your selected approach. Explain whether you think the

    asked by Rose
  68. calculus derivatives update

    update yes, sorry I wrote it wrong (mx)= (x^5-5x^3 +7x-4)^10 * (4x^9 +19)^23 Thanks again

    asked by cathy
  69. Accountinhg

    A difficult problem in calculating the total costs and expenses of a department is: Determining the gross profit ratio. Assigning direct costs to the department. correct Assigning indirect expenses to the department. Determining the amount of sales of the

    asked by Anonymous
  70. Statistics

    Measurements on the percentage of enrichment of 12 fuel rods used in a nuclear reactor were reported as follows; 3.11 2.88 3.08 3.01 2.84 2.86 3.04 3.09 3.08 2.89 3.12 2.98 a. Test the Hypothesis H0: µ = 2.95 versus H1: µ 0 ≠ 2.95, and draw appropriate

    asked by Josh
  71. math

    Issa IS driving to the airport to catch a flight to Miami, and Her arrival depends on traffic. If the traffic is light, then she can drive 60 mph and arrive at the airport 1 hour early. If traffic is heavy, she can drive 35 mph and arrive at the airport on

    asked by Jane
  72. Physics

    container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?

    asked by Rob
  73. Math

    Through (4, 3), m = - 3 A) y = -3x+1/15 B) y = -1/3x + 15 C) y = -3x + 15 D) y = -3x - 15

    asked by chchch
  74. Sociology

    What are the implications of a dual relationship? I don't need the answer, I just need to know what the question means by "implications". Like consequences??? Thanks

    asked by Bee
  75. Trig/Physics

    Joe walks 5 miles in the direction degrees North of East, and then 10 miles in the direction 20 degrees West of North. (a) How far is Joe from his starting position? (b) In what direction is Joe from his starting position?

    asked by Nycw
  76. gemetry

    An identification code is to consist of two letters followed by six digits. How many different codes if repetition is permitted.

    asked by angela
  77. physics

    A man on the top of a 40 meter tower directly overhead the road is watching a car moving on a straight road. The car speed makes an angular velocity with respect to the observer in a constant speed of 0.16radian/sec. Find the linear velocity of the car

    asked by pam
  78. math

    sin è=? O=8 H=16

    asked by ashley
  79. english

    Identify a serious error you find challenging to overcome in your own writing. What method will you use to avoid this error? Would you recommend the method to others? Why or why not?

    asked by ann
  80. Penn

    Wi-Fi stands for

    asked by Hall
  81. Finance

    gross profit gross margin is equal to

    asked by Tamika
  82. Chemistry

    If 50.0 mL of methane gas at 75.5 degrees C is cooled to 5.45 degrees C, what would be its new volume?

    asked by Bailey
  83. Calculus

    f(x)= 5ln(x)/x^7

    asked by Tara
  84. Physics

    A student applies a force of magnitude 39.0 N at an angle of 22.6o with the horizontal to push a 4.00-kg textbook 1.00 m across a table from rest to a final speed of 1.75 m/s. Find the work done by friction on the textbook.

    asked by Smith
  85. algebra 1

    joan builds a deck where the length is three times the width. if the perimeter is 64 feet what is the length of the deck.

    asked by humza
  86. physics

    At the grocery store, you place some produce onto a scale that has a vertically hung spring supporting the produce. The spring has a spring constant of 16 N/m. Your produce bobs up and down with an amplitude of 20 cm, and the maximum speed it reaches is

    asked by shawn
  87. chemistry

    why is it unwise to boil the oxolate solution in preparation for it's titration with permanganate

    asked by ama
  88. Economics

    Trade unions and Employer Organisations, Analyse the reasons for their opposition to the new industrial relations laws.

    asked by Susan
  89. sciences

    i want to become amember of young scientist association in my school. But for this i must give an idea of any science project . Please help me

    asked by edward
  90. English

    Hi, I am writing an essay about "Disneyfication" of folktales, and I searched for quotes and resources but I didn't find any useful information. I really need help in finding quotes and resources about "Disneyfication" of folktales.

    asked by zee
  91. Geometry

    Determine the distance between A(-1, 2, 3) and B(4, -5, 6) to the nearest tenth

    asked by Bread
  92. Math

    Solve: 3^x^2 : 3^x = 9 : 1

    asked by Mayank
  93. Macro Economics

    Explain carefully the meaning and importance of the term “productivity”

    asked by Anonymous
  94. Macro Economics

    If in 1984, measured GDP in Canada was $400 billion, and in 1985 it was $440 billion, explain why we cannot necessarily conclude that the typical Canadian's welfare has improved by 10-percent over the year.

    asked by Anonymous
  95. math/derivatives

    Please compute the derivative for g(x)= sqrt x - 3/x squared. I know the derivative for sqrt x = x ^1/2

    asked by bobbo
  96. math/calc

    How do I solve for an area under the curve when y = x^2 and solve for above the interval (1,2) ? Any resources where I could see examples would be helpful. Thanks!

    asked by cathy
  97. Math

    The radius of circle A is 9 times greater than the radius of circle B. Which of the following statements is true?

    asked by Kim
  98. calculus/derivatives

    I need to find the derivative and can't do them when they are raised to powers? Thank You. m(x)x^5 - 5x^3+7x -4)^10 (4x^9 +19)^23 this on is tuff!

    asked by cathy
  99. science

    10 name of acid and alkalies and there uses

    asked by hassan
  100. algebra

    which of the followings is another root f(x)=x^3-4x^2+14x-20

    asked by jessica hernandez
  101. English

    Can any one help me with the class foundations of curriculum?

    asked by Bella
  102. Algebra

    Paint Express charges $30 per gallon of paint plus $1.10 per square foot of wall space. Color Creations charges $24 per gallon of paint plus $1.20 per square foot of wall space. Robert estimates he will need four gallons of paint for the rooms he’d like

    asked by Veronica
  103. math grade 12

    i need to know the mathematical model for finding the cooling of a hot liquid. and what the letters mean. pls help thanks

    asked by ted
  104. math

    how do you solve by gaussian elimation 2x+y=3 3x-2y=1

    asked by tasha
  105. math

    need two words....How can I multiplu if I have groups that are?

    asked by Di Angelo
  106. college chemistry

    formt he diluted unknown concentration which i found to be 1.50mg/L i have to calculate the [Fe] in the PRIMARY unknown solution... that is placed in a 250mL volumetric flask

    asked by Anonymous
  107. Marh

    How many 3/4foot pieces of ribbon in 30 feet

    asked by Anonymous
  108. Algebra

    Whatis an "undefinded" matrix? Please give an example.

    asked by Taurus
  109. Business Calculus

    Determine the intervals where f(x)=e^-x^2/2 is increasing and decreasing

    asked by Jean
  110. Statistics

    cant tell if i am on right track for this prababilitly hw assigment help would good! I was recently given a hw assigment dealing with the price is right's "money game". The contestant is shown nine cards on a board. Each card has one pair of numbers. One

    asked by Mike jenkins
  111. Math

    Given the linear equation 5y = -3x + 19, find (a) the slope of a line perpendicular to the given line. (b) the slope of a line parallel to the given line. A. (a) -5/3 (b) 3/5 B. (a) -3/5 (b) 5/3 C. (a) 5/3 (b)-3/5 D. (a) 3/5 (b)-5/3

    asked by chchch
  112. Math

    x + 8 = 0 A) Undefined B) 1 C) -8 D) 0

    asked by chchch
  113. Math

    contains (10, -8) with undefined slope A) x = -8 B) y = -8 C) x = 10 D) y = 10

    asked by chchch
  114. Math

    complete the ordered pairs x = 2y - 8 ( , 0), (0, ),{ ,1/2} A) (4, 0) , (0, -8),{17/4,1/2} B) (-8, 0), (0, - 4) , {-9,1/2} C) (0, 0), (0, 0), {1,1/2} D) (-8, 0), (0, 4) , {-7,1/2}

    asked by chchch
  115. math

    Angle A 45° Angle B 45° Angle C ?

    asked by JAYCE
  116. Math

    which interval notation would go with this equation -5(4x - 14) ≥ -25x + 35 A) {x|x < -7}; (-∞, -7) B) {x|x ≤ -7}; (-∞, -7] C) {x|x > -7}; (-7, ∞) D) {x|x ≥ -7}; [-7, ∞)

    asked by chchch
  117. work

    Read the scenario. Use the reference material to assist you in determining what tasks to select for your squad to support the critical tasks identified for the platoon. 1. You are a member of Special Troop Battalion, 3d BCT, 10th Mountain Division. Your

    asked by Anonymous
  118. critical thinking

    Hi Everyone! Please post a substantive response to the following discussion questions by clicking on Reply: Euphemisms: seek to mute the disagreeable aspects of something or to emphasize its agreeable aspects Advertisers, even the media, will use

    asked by Anonymous
  119. math30

    LOGARITHMS AND EQUATION SOLVING Solve for x. Round to the nearest hundredth. 2^(x+3) = 17^(x)

    asked by alejandro
  120. chemistry

    Hello, this question is purely out of curiosity, please help to enlighten me. A hot water bag (one of those rubber ones with the rubber stopper at the top you screw in) was hidden under my bed for about a month. It was filled with a bit of water and folded

    asked by mary
  121. Physics

    A comet orbits the Sun with a period of 72.0 yr. (a) Find the semimajor axis of the orbit of the comet in astronomical units (1 AU is equal to the semimajor axis of the Earth's orbit). (b) If the comet is 0.60 AU from the Sun at perihelion, what is its

    asked by James