Questions Asked on
June 12, 2012

  1. chemistry

    A 375 g sample of well water is found to contain 17.0 mg of lead. How much lead (in parts per million) is in the well water? Round to the nearest tenth. Don't forget the unit.

    asked by sara
  2. early childhood

    When children do print alphabet letters among the easiest to print are a. A and X b . O and L c. C and U d. S and M is b correct

    asked by reema
  3. calculus

    a university alumni group wishes to provide an annual scholarship in the amount of 1500 beginning next year. if the scholarship fund will earn an interest rate of 8%/year compounded continuously, find the amount of the endowment the alumni are required to

    asked by soffy
  4. Chemistry

    The decomposition of dinitrogen tetroxide produces nitrogen dioxide: N2O4 (g) ---> 2 NO2(g) ΔG°= 2.80 kJ/mol Find the minimum partial pressure of N2O4 at which the reaction is spontaneous if P(NO2)=2.00 bar and T=298 K.

    asked by Kerrie
  5. Physics

    A 2.5 m rod of mass M= 4. kg is attached to a pivot .8m from the left end so that it can rotate vertically. At the left end of the rod is a small object with mass m=1.5kg. A spring with a spring constant k=90N/m is attached to the right end of the rod. The

    asked by Brandon w
  6. Algebra III

    How many positive odd integers less than 10,000 can be represented using the digits 0, 3, 6 an 9?

    asked by Anonymous
  7. Update Math Question

    The area of triangle B is 64 times greater than the area of triangle A.The perimeter of triangle B is how many times greater than the perimeter of triangle A? how many times greater than the perimeter of triangle A? A. 8 times greater B.64 times greater

    asked by jessica
  8. Math

    Cassidy says that capacity is the same as the amount. do you agree? explain why or why not.

    asked by Kingbla
  9. Chemistry

    If a plant produces 8.06 mol of C6H12O6 how many moles of CO2 are needed

    asked by Yolanda
  10. Physics

    Three applied forces F1= 20N, F2= 40N and F3= 10N act on a crate with a mass of 2kg on an incline with θ = 30o, φ = 60o and μk = 0.2, find the acceleration

    asked by user
  11. physics....

    1) Yellow light that has a wavelength of 560 nm passes through two narrow slits that are 0.300 mm apart. An interference pattern is produced on a screen 160 cm distant. What is the location of the first-order maximum? 2) A communication satellite is

    asked by kennedy
  12. physics

    What is the moment of inertia of a solid cylinder of radius R=0.9550m,thickness t= 0.015m, and total mass M= 3.565 kg?

    asked by George
  13. Math

    The measures of three angles of a quadrilateral are 80, 90, and 103 degrees. Find the measure of the fourth angle.

    asked by Maquavia Mccrae
  14. Economics

    Bank A has a leverage ratio of 10, while Bank B has a leverage ratio of 20. Similar losses on bank loans at the two banks cause the value of their assets to fall by 7 percent. Which bank shows a larger change in bank capital? Does either bank remain

    asked by Alvin
  15. chemistry

    The presence of a catalyst provides a reaction pathway in which the activation energy of a certain reaction is reduced from 188 kJ/mol to 86 kJ/mol which increases the rate of the reaction. How many times faster is the reaction with the catalyst at 307 K,

    asked by Smith
  16. Physics

    A system consists of two particles. Particle 1 with mass 2.0 kg is located at (2.0 m, 6.0 m) and has a velocity of (2.1 m/s, 4.1 m/s). Particle 2 with mass 4.5 kg is located at (4.0 m, 1.0 m) and has a velocity of (4.6 m/s, 4.6 m/s). Determine the position

    asked by James
  17. Physics

    An airplane flying at 82km/hr at 30 degrees east of north encounters a 40km/hr wind due west. What is the speed of the plane relative to the ground?

    asked by M
  18. Math

    Find the value of K such that the following trinomials can be factored over the integers: 1. 36x^2+18x+K 2. 3x^2 - 16x+K

    asked by Raj
  19. physics

    A satellite with a mass of 260 kg approaches a large planet at a speed vi,1 = 13.1 km/s. The planet is moving at a speed vi,2 = 10.2 km/s in the opposite direction. The satellite partially orbits the planet and then moves away from the planet in a

    asked by lanre
  20. physics

    A rock is tossed straight up with a speed of 29m/s. When it returns, it falls into a hole 13m deep. Solve for rock's velocity as it hits the bottom of the hole. &How long is the rock in the air, from the instant it is released until it hits the bottom of

    asked by Amanda
  21. chemistry

    Determine the entropy change for the following displacement reaction Cl2(g) + PbBr2(aq) --> PbCl2(aq) + Br2(l

    asked by lekeith
  22. chemistry

    From the following Information, calculate the standard change of enthalpy for the combustion of coal. SHOW WORK AND BALANCED REACTION!!! Compound DeltaHf (kj/mol) Coal 0.0 Carbon dioxide -393.5 Water (l) -285.9 Oxygen 0.0

    asked by Chloe
  23. chemistry

    From the following Information, calculate the standard change of enthalpy for the combustion of coal. SHOW WORK AND BALANCED REACTION!!! Compound DeltaHf (kj/mol) Coal 0.0 Carbon dioxide -393.5 Water (l) -285.9 Oxygen 0.0

    asked by Chloe
  24. Chemistry

    For 105ml of a buffer that is .40 M in HOCL and .36M in NaOCL what is the pH after 13.4 ml of 1.5M NaOH is added? Ka for HOCL is 3.5x10^-8

    asked by Andrew
  25. chemistry

    an electron jumps from energy level to energy level two by absorbing a photon of energy 8eV. What is the most likely energy of the photon that will be emitted by the electron when it moves back down to energy level one

    asked by rona
  26. Physics

    A 13.0 kg box is released on a 33 degree incline and accelerates down the incline at o.20 m/s^2. A. Find the friction force impeding it's motion B. What is the coefficient of kinetic friction

    asked by Mike
  27. statistics

    Suppose a box has eight differently colored tennis balls in it. The colors are green, blue, red, purple, orange, black, and white. if I will randomly pick out three balls (without replacement), then what is the probability that the balls chosen will be

    asked by Sarah

    1) The year that the Declaration of Independence was signed and pronounced to the rest of the world was... A) 1776 B) 1787 C) 1781 D) 1765 2)Which of the following was ratified with the assistance of adding a Bill of Rights to assure citizens that their

    asked by Booker Perry
  29. Statistics

    How is the rejection region defined and how is that related to the z-score and the p value? When do you reject or fail to reject the null hypothesis? Why do you think statisticians are asked to complete hypothesis testing? Can you think of examples in

    asked by Anonymous
  30. College Chemistry

    The initial concentration for the compounds involved in the reaction shown were determined to be [CH4(g)] = 0.6616 mol/L, [H2O(g)] = 0.8127 mol/L, [CO(g)] = 0.9566 mol/L, [H2(g)] = 0.7688 mol/L. Calculate the value of the equilibrium constant (Kc) at 1200

    asked by Morgan
  31. Physics

    A potter's wheel rotates with an angular frequency of 1.54 rad/s. What is its period?

    asked by Kate
  32. Physics

    A 25 N book sits on a table. What is the magnitude of the normal force the table exerts on the book?

    asked by Rachel
  33. english

    I am both a quick worker and careful.

    asked by Anonymous
  34. physics

    A 156 gram 8 ball rolls across a pool table at 2 m/s when it collides with a 7 ball of equal mass rolling in the opposite direction at 1.5 m/s. The 8 ball bounces backwards at 1 m/s. Find the momentum of the 7 ball.

    asked by someone
  35. chemistry

    The rate constant of the reaction between CO2 and OH - in aqueous solution to give the HCO3- ion is 1.5 1010 1/(M·s) at 25°C. Determine the rate constant at blood temperature (37°C), given that the activation energy for the reaction is 38 kJ/mol. units

    asked by parker

    What are some social, economic, aesthetic, and ethical issues involved in a current environmental controversy? Explain.

    asked by Evans

    Imagine that you manage a company that has invested $5 million in developing a new product, but has not completed development. At the last meeting, your salespeople report that the arrival of new competing products has reduced expected sales of your new

    asked by JIM
  38. Math

    Find the domain and range of the relation, and state whether or not the relation is a function. {(3, 9), (3, 10), (3, 11), (3, 12)}

    asked by Anonymous
  39. Art

    Here is the last part of the same summary. Thank you, Writeacher. 1) One day the garage owner discovers his wife’s love-affair. To escape his violent reaction, she runs out of the house, and is run down by Gatsby’s yellow car, driven by Daisy. 2) To

    asked by John
  40. Science

    How do you test the properties of an unknown material?

    asked by Lewis
  41. English

    for narrative essay i want to write about death, like before i used to think my world be perfect everyone be with me I have everything until my great grandmother died, and that be the first time someone in my family die that i be really close to, so that

    asked by Mohammad
  42. statistics

    Suppose that a researcher is interested in estimating the mean systolic blood pressure, , of executives of major corporations. He plans to use the blood pressures of a random sample of executives of major corporations to estimate . Assuming that the

    asked by Anonymous
  43. physics

    A 3.3-kg ball of clay with a speed of 14 m/s is thrown against a wall and sticks to the wall. What is the magnitude of the impulse exerted on the ball?

    asked by lanre
  44. history- Cuban Revolution- please help

    how did the Cuban revolution affect the Caribbean?

    asked by mike
  45. physics

    A spring with a spring-constant 2.2 N/cm is compressed 28 cm and released. The 5 kg mass skids down the frictional incline of height 31 cm and inclined at a 18◦ angle. The acceleration of gravity is 9.8 m/s2 . The path is frictionless except for a

    asked by melissa
  46. GED-Word Problems

    Enrique put $300 dollars into a savings account at 5% interest per year. The earned interest on the $300 was added to the account at the end of the year. At the time Enrique made an additional deposit of $200. How much does have in his account?

    asked by kayla

    Suppose an insurance agent offers you a policy that will provide you with a yearly income of $280,000 in 20 years. What is the comparable annual salary today, assuming an inflation rate of 5%?. (Round your answer to the nearest cent.)

    asked by Urgen please help
  48. Earth Science

    Which of the following processes helps to shape the landforms of Earth? - Mass movement - Glaciers - Wind - All of the above

    asked by PLEASE HELP
  49. Math

    for the curve y=2(3^x)+1, determine: the horizontal asymptote the y-intercept range end behaviour also, how would i sketch this?

    asked by Rebecca
  50. College

    If the line passing through point (a,1) and (8,7) is parallel to the line passing through the points (4,9) and (a+2,1) what is the value of a?

    asked by Justin
  51. Chemistry

    why would the concentration of ascorbic acid decrease as the temperature rises? Also is there any reason that the concentration would drop suddenly at 30 C then go back up and continue to decrease evenly. ( i repeated these 3set titrations 3 times and all

    asked by Aimee
  52. Chemistry

    What massof iron is contained in 86.6 grams if FeSO4?

    asked by Andre
  53. calculus

    according to data released by the chamber of commerce of a certain city, the weekly wages of female factory workers are normally distributed with a mean of 575 and a standard deviation of 50. Find the probability that a female factory worker selected at

    asked by soffy

    what are the advantages of the north and south in the civil war and what's their strategies?

    asked by Laruen
  55. math

    What is the apr if the amount financed $3500; Interest Charged $ 675; Number of Payments 24

    asked by shawn
  56. Algebra II

    Solve 4^(x+2)= 160 How would I round this answer to the nearest hundredth? My answer was 200, I don't believe I worked the problem out correctly.

    asked by Greg B.
  57. Physics

    A sphere weighs 200N resting on a wall. It is supported by a rope 20 degrees from the wall. What will be the tension force on the rope?

    asked by Jet

    (a) Write the expression in terms of natural logarithms. (Express all logarithmic functions in terms of ln(x) in your answer.) log_(8.9) \(135\) = (b) Give a calculator approximation (correct to four decimal places). log_(8.9) \(135\) ~=

    asked by Urgen please help
  59. Geography

    Growth by cell division that makes both ends of a plant longer but not wider is called A secondary growth. B annual ring growth. C vascular growth. D primary growth. is it D? thanks

    asked by Alexa
  60. Art

    Writeacher, here is a summary I urgently need you to check. Thank you. 1) Gatsby is an enigmatic figure, a mysterious “self-made man”, who appears to have achieved the American dream of immense wealth. 2) He is the owner of a palatial mansion where he

    asked by John
  61. CHemistry

    what is a conjugate acid/base pair that would be suitable to prepare an ideal buffer with a pH more than 7? If possible can you include Ka and Kb values to explain why the pH would be more than 7

    asked by Lisa
  62. algebra

    sue nees to find the length & width of a room. the room is 4 meters longer then it is wide. its perimeter is 24 meters. what is the width?

    asked by ej
  63. Business

    According to the doctrine of supply , the amount________ will increase as the _________decreases. I'm stuck on this question. I can't seem to find it in my text book

    asked by Laura
  64. Chemistry

    why would the concentration of ascorbic acid decrease as the temperature rises? Also is there any reason that the concentration would drop suddenly at 30 C then go back up and continue to decrease evenly. ( i repeated these 3set titrations 3 times and all

    asked by Aimee
  65. Business

    I have this assignment of constructing a business plan. I have chosen to make a flower shop which sells mainly different types of flowers, flower perfumes, flower scented soaps, air fresheners, etc. Would this business be in the primary, secondary,

    asked by Crissy XD
  66. statistics

    . Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190

    asked by stacy
  67. physical science

    Which of these is the balanced equation for this reaction? A. B. C. D.

    asked by kierra
  68. calculus

    to find the possible relative extrema of the function f(x,y) subject to the constraint g(x,y)=8, the lagrangian function based on the lagrange multiplier λ is given by....

    asked by soffy
  69. math equations

    Solve x = log3 15

    asked by jess
  70. early childhood

    When learning a finger play children usually learn the ----------first 1 actions 2 rhythm 3 words 4 rhymes is 1 right

    asked by reema
  71. physics

    A spring with a spring-constant 2.2 N/cm is compressed 28 cm and released. The 5 kg mass skids down the frictional incline of height 31 cm and inclined at a 18◦ angle. The acceleration of gravity is 9.8 m/s2 . The path is frictionless except for a

    asked by melissa
  72. Foreign languages

    Writeacher, I urgently need you to check these sentences, though I believe they don't make sense. Although I'm not a mechanic, I don't think the use of scientific English is correct. 1) I would like to focus on a kind of technology which is used to

    asked by John
  73. Medical Office Procedures

    Which screen do you use to set the reason for the visit?

    asked by Michelle
  74. DeskToping

    The _______ symbol is contained on the numeric keypad. A. ) B. % C. + D. $ I got C. If you press the down-arrow key ( ): A. You will jump to the previous page B. You will jump to the next page C. The inseration point will move down one line D. The

    asked by Sarah
  75. to ms.sue

    ok and thank you!

    asked by Celest
  76. Physical Edu

    The principle of progressive overload is described by an improvement in physical fitness which requires a gradual increase in physical activity and working the body beyond accustomed levels. is it True

    asked by Andy
  77. Math

    (2/3)^-2 + (-4)^-2

    asked by Rebecca
  78. Earth Science

    How old is the Gneiss in Greenland?

    asked by fred
  79. Math

    Suppose the modified quota is 6.47. Fill in the blanks, and round your answers to two decimal places. (a) Find the lower quota. (b) Find the upper quota. (c) Find the arithmetic mean of the lower and upper quotas. (d) Find the geometric mean of the lower

    asked by Randy
  80. math

    a c-shaped tile (2 in the top row, 1 on the second, 2 on the bottom) can be placed on a number chart so that the sum of the numbers covered is 29. show how this can be done

    asked by nour
  81. Chemistry PLEASE HELP!

    • A compound is known to contain only C, H, and N. • On combustion of a sample of 12.5 mg, 22.3 mg of CO2 and 15.2 mg of H2O were produced. •Use this data to find the empirical formula for the compound. (Please show working out)

    asked by Kevin
  82. geometry

    Show all work. Mary purchased a package of 15 different plants.but she only needed 10 plants for planting. In how many ways can she select the 10 plants from the package to be planted?

    asked by angela
  83. calculus

    find the average value of the function f(x,y)=e^(-x^2) over the plane region R which is the triangle with vertices (0,0), (1,0) and (1,1)

    asked by soffy
  84. calculus

    find the derivative of the function f(x) = e^(3x) sec (7x)

    asked by soffy
  85. chemistry

    The first-order rate constant for photodissociation of A is 5.97 1/h. Calculate the time needed for the concentration of A to decrease to the following quantities. a. 5% of its original value h b. one-third of its initial concentration h

    asked by mel
  86. calculus

    find the derivative of the function f(x) = x^2 cos (7x)

    asked by soffy
  87. math

    how do you graph f(x)=sin(x)-5

    asked by lanae
  88. math 2

    how do you solve the fowlling question

    asked by aliyah
  89. Quadratic Equations

    The question is Is the point (-3, -2) a solution of the intersection of the following set of quadratic equations: Y < -X^2 X^2 + Y^2 < 16 I guess I am somewhat confused by the way it's written. Would I be graphing this to find out? I'm so confused with

    asked by Greg B.
  90. science

    an electrical energy supplied to a toy car was 240 joules.If the car weighing 40N moved through a distance of 5m,calculate the efficiency

    asked by nanakofi
  91. math

    Determine the period, amplitude and phase shift for each given function: A)y = -4 cos 3x + 5 B)y = 2/3 sin (30x-90)-10 c)y = -0.38 tan (x/3+pi/3) d)y = pi cos(2x)+ pi

    asked by darshi
  92. Statistics

    A stoplight at the corner of Lincolnway and Duff Avenue is red 20% of the time. For someone who drives through this stoplight 10 times a week, what is the probability that they will stop at least three times?

    asked by Shelby

    If the principal P = $900, the rate r = 4 1 2 %, and time t = 1 year, find the following. (a) What is the amount of interest? $ (b) What is the future value?

    asked by Urgen please help
  94. Foreign languages

    This is the second part of the paragraph. Though I don't think it makes sense at all, I would like you to have a look at it. I added a sentence on nanotechnology I'd like you to check, Writeacher. 1) So this element of the composite torque is not under

    asked by John
  95. Math

    The perimeter of triangle B is how many times greater than the perimeter of triangle A?

    asked by jessica
  96. math

    I don't understand this question. I am suppose to be simplifying this: u^4-1/u^3-1 I put (u^2+1) (u+1)(u-1) for the top but the bottom, I can't figure out why my book put (u^2+u+1)(u-1) when it's only u^3...where did the extra u come from?

    asked by Help
  97. Social Studies

    Does anyone have any information about Sulawesi artifacts? I am having trouble finding facts about an ancient ceremonial mahogany grass bowl. Thanks.

    asked by Jesse
  98. to ms.sue-project

    about my summer poject, my teacher said we had to go to the library to borrow book or go somewhere to buy it.

    asked by Celest
  99. Elementary Statistics

    Given a level of confidence of 95% and a population standard deviation of 13, answer the following: (A) What other information is necessary to find the sample size (n)? (B) Find the Maximum Error of Estimate (E) if n = 82.

    asked by Victoria
  100. Desktoping

    The ______ symbol is used to represent mulitipication A. Asterisk B. At (@) C. Number (#) D. Tilde (~) I got C.

    asked by Sarah
  101. chemistry

    A solution has H+ = 5.0 ´ 10–5 M. Assume temperature of the solution is 25 Centigrade.The pH of this solution is?

    asked by sidd
  102. chemistry

    What volume of LR(Lactated Ringer's) solution would be required to make 1.0L of a solution that was .050M in chloride ion?

    asked by Bill
  103. physics

    A 58-kg astronaut inside a 9-m-long space capsule of mass 550 kg is floating weightlessly on one end of the capsule. He kicks off the wall at a velocity of 3.6 m/s toward the other end of the capsule. How long does it take the astronaut to reach the far

    asked by lanre
  104. English

    What does HiRobo look like? 1. He is long and strong. 2. His arm is long and strong. 3. He has a long and strong arm. 4. He has a long strong arm. (Are the answers all correct? What about #3 and #4? Which one is correct? are both OK?)

    asked by rfvv
  105. english

    i need help to finding a ballad pome

    asked by idiot
  106. probability

    two dice are tossed. find the probability that the sum is odd given that the sum is 5 or less

    asked by Anonymous
  107. math

    What is the range of f(x) = log(x – 3)?

    asked by Anonymous
  108. history

    which of the following was characteristic of the old stone age

    asked by jaymoney
  109. physics

    m1=4kg and m2=2kg and angle is 42 degrees.if the mass m2 is moving down with 0.5 m/s^2 acceleration, find the coefficient of the friction

    asked by user
  110. math

    If the value of x is 0, then what is the value of y in the function y = 3x - 5x2 + 9x3 - 8?

    asked by Anonymous
  111. early chidhood

    It is likely that a preschooler who learns to read early 1 will watch a lot of television 2 will enjoy playing outdoors as do other children 3 will watch less tv than other children 4 will enjoy playing outdoors as do other children and will watch less tv

    asked by reema
  112. math 2

    how do you solve the fowllowing question 6+(2x-7) fraction 2 over 3 =31

    asked by aliyah
  113. geometry

    L is a point on . CN = 85, CL = 32 – x and LN = 4x – 7. What is CL?

    asked by Anonymous
  114. Math

    Please round the number 43,678.426785 to the nearest ten thousand

    asked by Jane
  115. GED-Word Problems

    Taxes on lot A are $151.00 are more than on lot B. the combined taxes on the 2 lots are $1,121.00. What are the taxes for each lot?

    asked by kayla
  116. Math

    If I have 28 ft 9 5/8 inches and I need 3 equal rooms how big is each room supposed to be?

    asked by Mich