Questions Asked on
January 1, 2011

  1. physics

    a flute is essentially a pipe open at both ends. the length of a flute is approximately 66.1 cm. what is the third harmonic of a flute when all keys are closed, making the vibrating air column approximately equal to the length of the flute?

    asked by jacquie
  2. Chemistry

    Knowing that delta h vaporization for water is 40.7 kj/ mol calculate p vaporation of water at 37 degress

    asked by Zana
  3. Trigonometry

    Please review and tell me if i did something wrong. Find the following functions correct to five decimal places: a. sin 22degrees 43' b. cos 44degrees 56' c. sin 49degrees 17' d. tan 11degrees 37' e. sin 79degrees 23'30' f. cot 19degrees 0' 25'' g. tan

    asked by Anon
  4. derivatives

    If the derivative of f is given by f'(x)=ex-3x2, at which of the following values of x does f have a relative maximum value?

    asked by lisa
  5. PreCalculus

    Cone Problem Beginning with a circular piece of paper with a 4- inch radius, as shown in (a), cut out a sector with an arc of length x. Join the two radial edges of the remaining portion of the paper to form a cone with radius r and height h, as shown in

    asked by Emma
  6. Trigonometry

    Sketch a height versus time graph of the sinusoidal function that models each situation. draw at lease three cycles. assume that the first point plotted on each graph is at the lowest point: a girl lying on a an air mattress in a wave pool that is 3 m

    asked by Allison
  7. math

    suppose you are drinking root beer from a conical cup. the cup has a diameter of 8 cm and a depth of 10 cm. as you suck the straw, root beer leaves the cup at the rate of 7 cm^3/second. at what rate is the level of the liquid in the cup changng when the

    asked by stephen
  8. Pharmacy Tech

    Rx: Prostaglandin E 10mcg/mL If the stock container of prostaglandin E is 100 mg/mL, how many 9-mL dilutions are required to prepare the ordered concentration?

    asked by Isha
  9. geometry

    Triangle ABC, AB=8, BC=10, and AC=12, M is the midpoint of AB, and N is the midpoint of BC. What is the length of MN?

    asked by Will
  10. physics

    Three spheres, each with a negative chrge of 4.0x10^6C, are fixed at the vertices of an equilateral triangle whose sides are 0.20 m long. Calculate the magnitude and direction of the net electric force on each spehere. i used this:

    asked by ali
  11. math

    how much money would have to be invested in an account at 3.98% annual interset to achieve a balance of 25,000 in 17 years if a. The account pays simple interest b. the account compound interest qrtly c. the account compounds interest continuously

    asked by rick
  12. Geometry

    5. What theorem do Exercises 1-4 prove? (1 point) Triangle Inequality Theorem Converse of the Angle Bisector Theorem Angle Bisector Theorem Triangle Midsegment Theorem

    asked by Anonymous
  13. Math

    A baseball player hits a pitch when the ball is 2 feet off the ground. Two hundred feet from the plate, the ball reaches its maximum height of 82 feet. Will the ball clear the home run wall that is 10 feet high and 380 feet from home plate?

    asked by Morgan
  14. Physics

    Consider the diagram of the box and bucket. If the coefficient of static friction is 0.5 and the coefficient of kinetic friction is 0.3, find the maximum mass of the bucket in order for the system to be in static equilibrium. If the block was given a

    asked by Caitlin
  15. pre-calc

    How do you find coterminal angles between 0 and 2pi for angles given in pi radians?

    asked by Sarma
  16. math

    Bacteria are growing in a circular colony one bacterium thick. the bacteria are growing at a constant rate, making the area of the colony increase at a rate of 12mm^2 per hour. How fast is the radius changing when the radius is 3mm?

    asked by stephen
  17. English

    Please help me find these words in the book hatchet. These words are located in chapter 13-16 and all I need to knnow is where these words are located. I have found the book online and I have posted it underneath. I have done a couple of words all ready so

    asked by Mariyada
  18. math

    A baseball player hits a line drive to center field. As he rounds second base, he heads directly for third, running at 20 ft/sec. How fast is the distance from the rnner to home plate changing when he is halfway to third base?

    asked by stephen
  19. Pre-Algebra

    Can someone show me how to solve this problem step by step?Here is the problem, 26cm/s= m/min,how to solve it by convert rate suing dimensional analysis.

    asked by kj
  20. physics

    Three spheres, each with a negative chrge of 4.0x10^6C, are fixed at the vertices of an equilateral triangle whose sides are 0.20 m long. Calculate the magnitude and direction of the net electric force on each spehere. i used this:

    asked by ali
  21. Trigonometry

    Using exact values, find the value of: a. 12 sin 30 degrees ¨C 6 tan 45degrees + sec 45degrees / 52 12-1/2-6*(1) + ¡Ì2/52=¡Ì2/52 12-1/2-6+¡Ì2/52 what should i do next?? b. Sin2A + tan3A/2 - cos A + sec(a+ 15) Sin2A + tan3A/2 - cos A + sec(a+ 15)=

    asked by Anon
  22. science

    Helium has the lowest boiling point of the elements. The slightest change in temp can cause it to vaporize and expand. To prevent pressure explosions, a line from the tank has a "burst disk" in case a of sudden pressure increse. then the diaphragm would

    asked by anonymous
  23. physical science

    what physical law/s were used during the "burns" of Apollo 13 to adjust its path/trajectory and get it home? I know the thrusters used Newton's third law. What else?

    asked by anonymous
  24. physical science

    Helium has the lowest boiling point of the elements. The slightest change in temp can cause it to vaporize and expand. To prevent pressure explosions, a line from the tank has a "burst disk" in case a of sudden pressure increse. then the diaphragm would

    asked by anonymous
  25. Pre-Algebra

    Can anyone show me step by step how to solve this problem? 26cm/s = m/min convert this problem using dimensional analysis.What is the answer and how did you get it?Thanks,kj

    asked by kj
  26. physics

    Three spheres, each with a negative chrge of 4.0x10^6C, are fixed at the vertices of an equilateral triangle whose sides are 0.20 m long. Calculate the magnitude and direction of the net electric force on each spehere. i used this:

    asked by ali
  27. Math

    Please help me factor this. x(-x^3-4x^2+3x+18) (using synthetic division please.) Thank You.

    asked by Ka
  28. Biography

    What was Louis Armstrong's goals?

    asked by Alex
  29. math

    A ship is 400 miles directly north of the tahiti and is sailing south at 20mi/hr. another ship is 300 miles east of tahiti and is sailing west at 15mi/hr. at what rate is the distance between the ships changing?

    asked by stephen
  30. Algebra

    factor trinomial This is what I have so far don't know where to go from here 4h^2 + 8h - 5 (4h^2-2h) + (10h-5) 2h(h-5) + -5(2h-1) cant figure out what to do next

    asked by Kim
  31. Algegra 1

    The value v of a shopkeeper's inventory software program is given by v=-1/3t+3, where t is the number of years since the shopkeeper brought the program. What is the program worth 9 years after it is first purchased? Plot the point with the given t value 9

    asked by Esther
  32. math

    a cord is used to lower vertically a block of mass M a distance d at a constant downward acceleration of 1\4 g, find the work done by the cord on the block ? FIND THE WORK DONE BY THE FORCE OF GRAVITT

    asked by samina
  33. chemistry

    If a person was locked in a perfectly insulated room 8 ft by 8 ft by 10 ft how long would it take the room temperature to increase from 75 degrees F to 100 degrees F? A person's body heat output is 100 watts and their volume is 3 cubic feet. Also, it is

    asked by victoria
  34. functional english

    How can i describe three different scenarios where stress can build up and affect a person? Also i have no idea on how to start! please help?

    asked by Milly
  35. English

    Can you please check these few sentences, please? In particular, I'm not sure about the vocabulary related to skiing equipment. Thank you. 1)Yesterday night we burst (set off) some firecrackers in the garden. Then we watched the fireworks from the window.

    asked by Franco
  36. Calculus

    Hi, I'm absolutely stuck on this problem. This is for a newton's method/linearization unit. Find an equation for the curve in the xy-plane that passes through the point (1,-1) if its slope at x is always 3x^2+2.

    asked by Jay
  37. science

    what are the steps to the scientific method?

    asked by salam
  38. science

    which one of these is a possible reaction? Cl2 + Br2 Br^-1 + I^-1 I2 + Cl^-1 Br2 + I^-1

    asked by i love chem
  39. math

    In a factory of electronic items, the total cost of production, expressed in thousands of dollars, is given by the function C(x)= (x^2-x+2)/x+1 where x belongs to [0;5] and expressed in hundrends of items produced. 1) calculate in dollars the total cost of

    asked by Jessy
  40. Biology

    List and describe the steps involved when a gene in person's genotype is expressed to create a biochemical or physical characteristics that is a part of the persons phenotype.

    asked by KYLA
  41. statistics

    3. You obtain the following regression statistics for the relationship between defect rate and volume at one of your plants. You have a random sample of results from 160 shifts at the plant.

    asked by john
  42. english

    The poor woman had some _______(happy) days. Hari is the _____ (idle) boy in the class. The ______ (long) lane has a twining. Hunger is the ______ (good) sauce. I congratulated him on his ______ (good) fortune. There was not the ______ (slight) excuse for

    asked by pratham
  43. Algebra 1

    The value v of a shopkeeper's inventory software program is given by v=-1/3t+3, where t is the number of years since the shopkeeper brought the program. What is the program worth 9 years after it is first purchased? Plot the point with the given t value 9

    asked by Esther
  44. business

    what is the difference between comparative & international criminal justice systems? explain with examples

    asked by mee
  45. Math

    What do you get when you solve this equation where t = time in hours log t = (0.576 log (72/526) -0.176 Would it matter if t were in minutes? Thank you

    asked by Deborah
  46. Algebra

    factor and solve 6d^2 + 2d = 10d + 35

    asked by tana
  47. GRAMMAR

    I used these in sentences, I just need to know if they are verbs? 1.Education is 2.have taken 3.will give 4.worked 5.will be leading

    asked by Anonymous
  48. Algebra 1

    The value v of a shopkeeper's inventory software program is given by v=-1/3t+3, where t is the number of years since the shopkeeper brought the program. What is the program worth 9 years after it is first purchased? Plot the point with the given t value 9

    asked by Esther
  49. Pre-Algebra

    Victoria you helped me with the last problem can you help me again with this one please? 26cm/s=m/min. Convert this using the dimensional analysis.Thank-you.kj

    asked by kj
  50. science

    how come there is a blackout period when the space shuttle goes behind the moon? Is it because radio waves can be transmitted through a solid object or through a vacuum or why?

    asked by anonymous
  51. science

    Whose responsibility is it to reduce our impacts on climate?

    asked by melvin
  52. science

    Which of the following properties increase with increasing atomic number for fluorine and chlorine? I. melting point of the elements (yes) II. boiling point of the hydrogen halides A) I only B) II only C) Both I and II D) neither I nor II I think it's A -

    asked by i love chem
  53. math

    Fadi is in a boat 3 kilometers away from the nearest point A at the sea shore.5kilometers away from A is the home of fadi. knowing that he can row 6km/hr and run 10km/hr.the objective of this exercise is to find the position of point B on the sea shore

    asked by anna
  54. Global

    How did the Scramble for africa impact people living back then & living today?

    asked by karla
  55. algebra

    show me how to find a slope?

    asked by luz
  56. math

    What terms is missing from this set of ordered pairs? (0, -2)(?, 0)(5,8)

    asked by Nadine
  57. math

    how do i simplify [(x^3/y^3) -1]/[(x^2+y^2)+(x/y)+1]

    asked by emily
  58. math

    if you have a bill of 1.354 pesos ( philippines money) how can you it equal to a three family. example .Daniel 2 children Rolando 4 children Dante 5 children. how much will he pay per head of the family in order to equal a bill of each children to a bill

    asked by Greg
  59. com170

    I would like to know if there are any errors . like comma uuseage question marks,quotation mark, and apostrophes, capitalization, colons,semicolons, andcommonly misuesd words Why are many students choosing to pursue their college degrees using their home

    asked by angela
  60. java refractor

    Why am I getting error called that the renaming refractor cannot apply in this context when trying to change a name in the netbeans? And how should I solve it? Please tell me quickly. emergency I need to submit my project tomorrow

    asked by harry
  61. algebra 2

    Q(x)= x^2-6x+3, find Q(-3) I REALLY DON'T KNOW WHAT THE HECK ITS ASKING FOR

    asked by Adam-Zeg
  62. Pre-Algebra

    can someone show me how step by step to convert this problem 45 mi/h=ft/s using dimensional analysis?Thanks.kj

    asked by kj
  63. Pre-Algebra

    Can anyone show me step by step how to solve this problem? 26cm/s = m/min convert this problem using dimensional analysis.kj

    asked by kj
  64. Pre-calc

    How do you find coterminal angles in pi radians?

    asked by Sarma