Questions Asked on
December 28, 2010

  1. Physics

    A 4-kg sled sliding freely on an icy surface experiences a 2 _ N frictional force exerted by the ice and an air-resistive force of 0.5 N. a. What is the net force acting on the sled? b. What is the acceleration of the sled?

    asked by Katherine
  2. physics

    A student pulls a 60.-newton sled with a force having a magnitude of 20. newtons. What is the magnitude of the force that the sled exerts on the student

    asked by cookie
  3. Physics- Angular Momentum

    A long thin rod of mass M=2.00 kg and length L=75.0 cm is free to rotate about its center. Two identical masses (each of mass m = .45kg) slide without friction along the rod. The two masses begin at the rod's point of rotation when the rod is rotating at

    asked by Miki
  4. Physics

    Take two Styrofoam cups, partially fill them with equal amounts of cold water, and drop equal amounts of ice into each cup to obtain a mixture of ice and water. a. Stir the water and ice mixture in one of the cups vigorously with a nonmetallic stirrer

    asked by Katherine
  5. chemistry

    Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C4H4 (-2341 kJ/mol), C4H8 (-2766 kJ/mol) and H2

    asked by Lux
  6. Chemistry

    If the reaction of 2.5 g of Al with 2.5 g of O2 produced 3.5 g of Al2O3, what is the percent yield of Al2)3? Be sure to write and balance equation. 4Al + 302 ---> 2Al2O3 2.5 g Al x (1 mol Al / 108 g) x (2 mol Al2O3 / 4 mol Al) = .0115 mol Al2O3 .0115 mol

    asked by Anonymous
  7. Physics

    A 0.12-kg ball traveling with a speed of 40 m/s is brought to rest in a catcher's mitt. What is the size of the impulse exerted by the mitt on the ball?

    asked by Sylvia
  8. Physics

    A bowling ball has a mass of 6 kg and a speed of 1.5m/s. A baseball has a mass of 0.12 kg and a speed of 40 m/s. Which ball has the larger momentum?

    asked by Sylvia
  9. chemistry

    A quantity of 0.020 mole of a gas initially at 0.050 L and 20 degrees Celsius undergoes a constant-temperature expansion until its volume is 0.59 L. Calculate the work done (in joules) by the the gas if it expands (b) pressure of 0.20 atm. (C) If gas in

    asked by Anna
  10. Chemistry

    A quantity of 0.020 mole of a gas initially at 0.050 L and 20 degrees Celsius undergoes a constant-temperature expansion until its volume is 0.59 L. Calculate the work done (in joules) by the the gas if it expands (b) pressure of 0.20 atm. (C) If gas in

    asked by Cynthia
  11. calculus

    A cylindrical can is to be made to hold 100cm cubic.The material for its top and bottom cost twice as much per cm square as that for its side. The objective of this problem is to find the radius and the height of this cylinder such that its cost is

    asked by zeina
  12. chemistry

    On complete oxidation, one mole of an organic compound produced four moles of water. Which one of the following substances could it be? CH4 C2H6 C3H7OH C4H10 So I added O2 to each of these compounds, but I must be doing something wrong because I can't get

    asked by chem
  13. Diversity

    Which onw of the following statements is NOT valid about the presence of a "mismatch between home and school?" a.There are differencein language & social communication patterns b.Children's early developmental foundations might be at risk. c.Literacy &

    asked by Karol
  14. physics

    Three charges are arranged in a line. From left to right, the charges are: Q1= -8mC, Q2 = +3mC and Q3 = -4mC. The distance between Q1 and Q2 is 0.3 m, and the distance between Q2 and Q3 is 0.2 m. Calculate the net electrostatic force on Q3.

    asked by gayathri
  15. biology can someone check

    Decide if each of the following statements is true.If it is not rewrite the parentheses part to make it true. 1) Scientific methods include observation,(forming a hypothesis, and experiment). ans: false ;answer questions; solve problems 2)A statement that

    asked by joy
  16. English

    11. How does Moishe the Beadle’s experience in the Galician forest change him? Your response should be at least one paragraph long. (2 points) 12. What is the irony of Elie’s and his neighbors' joy in leaving the hot ghetto? Your response should be at

    asked by max
  17. trig

    find the exact values of THE SIX TRIGONOMETRIC FUNCTIONS OF THE ANGLE THETA WHICH HAS A POINT ON THE TERMINAL SIDE OF (-1,4)

    asked by joy
  18. Physics

    Consider an electron entering a region between two charged metal plates where, aside from the electric field E, there is also a constant magnetic field B directed into the paper. V is the velocity of the electron (from left to right direction). a)Write an

    asked by Cici
  19. EnglishCOM

    Write five sentences about the role of education in successful financial planning in the spaces on the following page. Correctly use a different verb tense in each sentence. Highlight each verb in yellow and identify the tense in parentheses. Education is

    asked by Carmelita
  20. chemistry

    32.5% ethylene cabonate is how much in milli litters

    asked by pradee
  21. algebra

    At a school store, 6 pencils sell for $.99. At this rate, what is the cost of 16?

    asked by bijou
  22. geometry

    Find the approximate perimeter of triangle abc with vertices a(0,8 b(6,-2 c(-4,4

    asked by Tina
  23. Math

    5,590 Financed with finance charge of $1693.77 with 36 payments. What is approximate annual per centage rate

    asked by Mary
  24. biology can someone check

    Identify each of the parentheses items as an independent or dependent variable. 1)The (number of red blood cells )independent in a mouse's blood at(different levels of iron) dependent in its diet. 20)The (amount of starch formed)dependent in a plant leaf

    asked by joy
  25. English

    need help on the book night. 11. How does Moishe the Beadle’s experience in the Galician forest change him? Your response should be at least one paragraph long. (2 points) 12. What is the irony of Elie’s and his neighbors' joy in leaving the hot

    asked by love
  26. chem100-1

    Can eletrolysis be used to separate salt in the sea int o elemental sodium and clorine gas -- somthing like 2NaCl --> 2Na + Cl2 ?

    asked by tom
  27. calcus/ math

    Nick has enough wire to construct a 100m of fence. he wish to use it to form three sides of a rectangular garden,one side is along his building. 1)What dimensions should be choose in order to enclose the largest possible area? 2)Verify the result thus

    asked by Jessy
  28. Calculus

    Find dy/dx y = (x+y)/(x√2) I know that you can simplify the problem by arranging it to: y = (x)/(x√2) + (y)/(x√2) but I don't know where to go from here

    asked by Liz
  29. environmental science

    The earth's differentiation and size were significant factors for life on Earth because Earth's composition and gravitational attraction

    asked by Anonymous
  30. us history

    what are the similarties and differences of philosophies in the Articals of confederation and the constitution

    asked by kim
  31. business math

    financing furniture that costs $4200.00 with a two year installment loan. The loan requires a 12% down payment and 24 equal monthly payments of $195.00. According to this information, what would be the finance charge on the loan?

    asked by brandi
  32. Physics

    Consider a version of the atwood machine in which the masses are frictionless incline. The mass sliding on incline 1, m1, is 1.5 kg, and the angle of this incline is 62 deg. If the mass on the second incline, m2, is 2.5 kg, what is the angle 2 so that the

    asked by rachel
  33. math

    if you have a bill of 1.346 pesos how can you equal each person in 5 family per head? example.family of Joseph-3 family of Ben -2 family of Greg -4?

    asked by charles
  34. Physics

    Which of these types of motors or engines are heat engines? a. an automobile engine b. an electric motor c. a steam turbine

    asked by Sylvia
  35. science

    calculate the momentum of a 2000-kg truck travelling 19m/s?

    asked by jennyy
  36. Drafting

    In architectural drafting, you would indicate a brick surface on an elevation view using what?

    asked by John
  37. english

    some one help me to define phonetic symbol?

    asked by rahila
  38. english

    i need ideas about a reflective journal the subject is : the english class

    asked by Fida
  39. math

    $5.50

    asked by bijou
  40. Physics

    A 0.4-kg ball has a velocity of 20 m/s. a. What is the kinetic energy of the ball? b. How much work was required to lift the box to this position?

    asked by Sylvia
  41. English

    Can you please check these sentences for me, please? Number 4 contains a run-on sentence I need to simplify. Thank you very much. 1) Victor created the monster with body parts selected from corpses chosen for their beauty. (??) 2) Victor created the

    asked by Franco
  42. music

    can u help me found a song that's online that has the music so i can play the song on my clarient it called bruno mars grenade can any1 help me found the music for that song on a clarient.... please

    asked by eva
  43. Soc312

    What roles did Hamilton High serve at various points in its history? What factors caused those roles to change? How could Hamilton High have been more culturally responsive to diverse student groups?

    asked by alicia
  44. Diversity

    caregiver behaviors such as ignoring children'ssound babbling back to baby or repositioning the child on one 's lap are indicative of variable levels of a imitative play b. pattern training c. responsivity d.social awareness I CHOSE "c" AS MY ANSWER.

    asked by Karol
  45. English

    I forgot to include these sentences. I really hope you can have a look at them, too. 1)Frankenstein is composed of parts of dead bodies (of parts selected from corpses) 2)You forgot to introduce the element of fear when presenting the gothic fatures of

    asked by Franco
  46. Sci

    I am writing a peom on the element flourine and it should explain and the structure of the atoms that make up that element, explain why it is where it is on the periodic table, what element(s) it might combine with to make a compound/molecule, and finally,

    asked by Sumaiya
  47. math

    input output 1 5 2 8 4 14 8 ?

    asked by seesaw
  48. science

    calculate the momentum of a 2000-kg truck travelling 19m/s?

    asked by jennyy
  49. Math

    f you have a bill of 1.439 pesos how can you equal each person in 3 family in per head? example.family of Joseph-3 family of Daniel-2 family of charles-5?

    asked by Greg
  50. physics

    a convex lens of focal length 30cm is cut half perpendicular to its principal axes what is its new focal length

    asked by sehrish
  51. Physics

    A hammer is used to pound a piece of sot metal into a new shape. If the metal is thermally insulated from its surroundings, will its temperature change due to the pounding?

    asked by Katherine
  52. Physics

    Could a simple machine such as a lever, a pulley system or a hydraulic jack be considered a heat engine?

    asked by Sylvia
  53. English

    Thank you very much for your corrections. Here are some more sentences I'm unsure of. 1)The monster is an outcast, a rebel uncorrupted by society. He is different from anyone (else?) because of his ugly (revolting?) aspect. He becomes a murderer who kills

    asked by Franco
  54. English

    How do I diagram this sentence? "They were made more cruel by the exposure of their position aloft on high seats." I don't know what to do with "aloft on high seats."

    asked by Leslie
  55. psychology

    I need the definition of Ecclectic theory in adult devlopement. I know it is a part of all theories related to adult developement but can't find a definition.

    asked by Angela
  56. art history

    name four concepts or subjects on which renaissance artists based their works

    asked by kevin