Questions Asked on
July 7, 2008

  1. Organic Chemistry

    HCl is added to t-pentyl alcohol in a vial to synthesize t-pentyl chloride. t-pentyl chloride separates on top and the bottom layer is discarded. Sodium bicarbonate is then used to wash the crude t-pentyl chloride. What is the purpose of this wash and why

    asked by Bert
  2. physics

    In February 1955, a paratrooper fell 370 m from an airplane without being able to open his chute but happened to land in snow, suffering only minor injuries. Assume that his speed at impact was 62 m/s (terminal speed), that his mass (including gear) was 71

    asked by farah
  3. physics

    The force shown in the force-time diagram in Figure P6.11 acts on a 1.4 kg object. (a) Find the impulse of the force. (b) Find the final velocity of the mass if it is initially at rest. (c) Find the final velocity of the mass if it is initially moving

    asked by Elisa
  4. physics

    A 45.0 kg girl is standing on a 163 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.45 m/s relative to the plank. (a)

    asked by Elisa
  5. physics

    A ball of mass 0.120 kg is dropped from rest from a height of 1.25 m. It rebounds from the floor to reach a height of 0.600 m. What impulse was given to the ball by the floor?

    asked by Elisa
  6. physics

    Calculate the magnitude of the linear momentum for the following cases. (a) a proton with mass 1.67 10-27 kg, moving with a speed of 4.00 106 m/s (b) a 16.5 g bullet moving with a speed of 270 m/s (c) a 70.5 kg sprinter running with a speed of 12.5 m/s (d)

    asked by Elisa
  7. English

    As it sailed south,Lord Nelson's great ship,Victory,met the Spanish fleet near Trafalgar. complete predicate of the sentence begain with what word? whats the simple subject of the sentence?

    asked by AK
  8. english

    sorry i havent really used this site and im not sure how to repost my question instead of putting it as an answer to my question so heres the repost: I had to find embedded clauses I deplore the fact that bats have wings. --> bats have wings That Guinevere

    asked by Anonymous
  9. Algebra

    Manny works 40 hours per week. He must work for his parents where he earns $8 per hour. He also works for a computer company where he earns $20 per hour. What is the minimum number of hours Manny can work for the computer company to earn a total of $464

    asked by Donghae
  10. physics

    an overhead view of the path taken by a 0.162 kg cue ball as it bounces from a rail of a pool table. The ball's initial speed is 1.11 m/s, and the angle è1 is 64.7°. The bounce reverses the y component of the ball's velocity but does not alter the x

    asked by farah
  11. physics

    1. A 10.0 g object moving to the right at 25.0 cm/s makes an elastic head-on collision with a 15.0 g object moving in the opposite direction at 36.0 cm/s. Find the velocity of each object after the collision. 10.0 g object: 15.0g object: 2. A dentist's

    asked by Elisa
  12. physics

    A space vehicle is traveling at 4100 km/h relative to Earth when the exhausted rocket motor is disengaged and sent backward with a speed of 76 km/h relative to the command module. The mass of the motor is four times the mass of the module. What is the

    asked by farah
  13. Calculus

    Find the scalar equation of the plane through the points M(1,2,3) and N(3,2,-1) that is perpendicular to the plane with equation 3x + 2y + 6z +1 = 0. I know that normal of the latter equation is (3,2,6) but now what do I do? Thanks.

    asked by Lulu
  14. english

    Please help me ive been trying to figure this out, but I DO NOT understand it...I do not understand what an embedded sentence is We have to find the embedded sentences in: I deplore the fact that bats have wings. That Guinevere loves Lorian is known to all

    asked by Anonymous


    asked by Xaxa
  16. physics

    An archer shoots an arrow toward a 300 g target that is sliding in her direction at a speed of 2.35 m/s on a smooth, slippery surface. The 22.5 g arrow is shot with a speed of 41.0 m/s and passes through the target, which is stopped by the impact. What is

    asked by Elisa
  17. MATH

    1. A father is three times as old as his son. Five years ago the sum of their ages was 30. How old is the father now? Choices; 30, 35, 40, 45, 50 2. A mother is four times as old as her daughter. In two years, the sum of their ages will be 44. How old is

    asked by LILY
  18. Alg. 2

    Maximize the objective function M=6x+3y under the constraints {x ¡Ý 0 y ¡Ü 5 y ¡Ü -x + 10 y ¡Ý.5x - 4}

    asked by Larry
  19. Chemistry

    Which of the following is an example of a Homogeneous mixture? a. the hydrogen and oxygen atoms that make up water b. A typical soil sample c. a bottle of table vinegar

    asked by Mickey
  20. English

    Prisoner Freed For 18 years Dr. Alexander Manette was secretly and unjustly held in a prison located in Paris, France. Manette witnessed a crime committed by two noble brothers, the St. Evremondes, and was imprisoned so that he could not report their

    asked by Emily
  21. Explanation for calc. answer

    I don't know how to answer this: A vector can be used to represent the path of a drill tip used to bore a deep mine shaft in Sudbury one quarter of the way to the centre of the Earth. Represent the vector using a directed line segment and Cartesian

    asked by Derek for drwls!
  22. Chemistry

    which of the following elements does not form bonds easily because it has a full outer shell? a. Aluminum b. Carbon c. Helium d. Calcium

    asked by Mickey
  23. Biology

    Find an angiosperm that has modified leaves, stems, roots or flowers that do not function in a normal manner? Example: Claifornia Barrel Cactus has spines in place of leaves to reduce water loss.

    asked by Michelle
  24. physics

    I have some conflicts with this problem as I think my teacher did it wrong. A speeder travelling at 34m/s passes a police at rest at the side of the road. The police accelerates at 1.82m/s^2. How long does it take the policeman to catch the speeder? He has

    asked by Xi
  25. To Anonymous, Spanish

    Please check down below. You need to know that what you wrote is quite incorrect. Sra

    asked by SraJMcGin
  26. homonym

    is homonym used correctly? If you ask me,there's no hobby like fishing

    asked by AK
  27. English Continued

    Boy Killed By Carriage A young boy was killed last night when he was run over in the street by a carriage. The driver was told to drive fast and recklessly through the narrow streets by the carriage’s passenger, Marquis Evremonde. The driver revealed to

    asked by Emily
  28. Math

    express the component of a cross product vector C= A x B in terms of Levi civita product vector and the component of a and B, using this relation show that A . ( AxB ) = 0

    asked by Indu
  29. help

    HUM 130 Week 1 Vocabulary Quiz Define these terms in your own words. 1. Immanent that which underlies every thing 2. Religion beliefs and practices which bind your life together to, with and for a 'higher power" 3. Theistic believing in God or gods 4.

    asked by Anonymous
  30. Math

    The population of the three species is shown below. Species Population Male Female Bullfrog 30% 60% 40% SpringPeeper 50% 55% 45% Mink Frog 20% 52% 48% Determine the probability that the first two frogs captured are a) bullfrogs b) female bullfrogs c)

    asked by Priya
  31. For Everyone on Jiskha

    Hey, I just wanted to say a HUGE THANKS to everyone on this website for helping me out so far with calculus. I am actually understanding a lot because of the help I am getting, you are all a really big help. I appreciate it so much thanks!

    asked by Derek
  32. algerbra

    the problem was misunderstood 1/4 = 3- (2x-1 divided by x+2)

    asked by glenetta
  33. AED 200

    As the supply of teachers diminishes, the demand on new and existing teachers increases. As a potential teacher and educator, identify two perceived challenges of the teaching profession that you may struggle with most. In contrast, identify two

    asked by caroline
  34. speech

    i need a speech why we should we respect our elders

    asked by wasim khokhare
  35. chemistry

    given this reaction N2O5 -> 2 N2O + 1/2 O2 all gases and given the initial pressure (P Initial) and total pressure (P total)at any time, relate the partial pressure of N2O5 (PP N2O5) to P total for any time during this reaction. Consider gas kinetics. My

    asked by guy
  36. biology

    How does muscle tetany differ from the bacterial intoxication tetanus in mechanism?

    asked by Marian Akinsete
  37. algebra

    could you explain to me how to figure this out? n + n/3 = 1/2?? step-by-step??

    asked by Shivangi
  38. Calc.

    Determine the value of k so that the line with parametric equations x = 2 + 3t, y = -2 + 5t, z = k is parallel to the plane with equation 4x + 3y – 3z -12 = 0

    asked by Derek
  39. To "Cutie..."

    Please choose a better "First Name" -- make sure it's not offensive in the least! Then repost your question. Thanks. =)

    asked by Writeacher
  40. chem

    Balance the equation: Note: If a chemical species coefficient is "1" then "1" needs to be entered in the field before that species. ___MnO4(–) + __H(+) + ___Fe2 + __Mn(2+) + ___H2O + ____Fe(3+)

    asked by UN
  41. English

    I'm supposed to write a first person narrative from the view of someone that shares a different one than me. p. 59 in New Millennium Reader if anyone has it. How long should it be? How should I start it off? I'm having trouble picking a topic and a view.

    asked by Claire
  42. chem

    Balance the equation: Note: If a chemical species coefficient is "1" then "1" needs to be entered in the field before that species. __MnO4(–) + __H(+) + __C2O4(2–) __Mn(2+) + __H2O + __CO2 i need a check pls

    asked by UN
  43. statistics


    asked by ROSHNI
  44. Math

    How do you find a common denominator?

    asked by Isabel
  45. statistics

    I am working on setting a formula equal to another-the first formula is A=1.2P and the 2nd the least squares regression line y=-2.433x +950.5. How can I set this equal to obtain a graph of the information

    asked by Kate3
  46. Spanish

    Is there anything wrong with this? ¿Hola el amigo, cómo es usted? Tengo una familia maravillosa. Tengo dos hermanos y una hermana. Mis hermanos son veintiséis y treinta. Mi hermana es veintisiete. Im solamente dieciocho son tan más viejos. Tengo dos

    asked by Anonymous
  47. English

    either Mark or his students BLANK on the ferry boat. if you want to use the present tense, which word would fill the BLANK. A.are C.were D.was

    asked by AK
  48. homonym

    dose this sentence use homonyom correctly? karen's new dog had flees.

    asked by lol
  49. Chemistry

    Which of the following elements does not form bonds easily because it has a full outer shell? a. Aluminum b. Carbon c. Helium d. Calcium

    asked by JLV
  50. homonym

    Does this sentence use a homonym correctly? the old miner was lost in the dessert

    asked by lol
  51. Gen chem 2

    D-Glucose, C6H12O6, is an aldohexose sugar which occurs commonly in nature. In a text or reference book look up "-D-(+)-Glucose and write its correct, complete Lewis structure. Then “parcel” e’s to determine the correct (O) no. for each C atom in

    asked by Elisa
  52. GNP

    What is the GNP of Scotland Please, cant seem to find anywhere!!

    asked by RIA
  53. science

    A scientist is trying to discover a new treatment to stop cancer cells from dividing. In the cancer cells, which of these processes will stop if the treatment is successful?

    asked by toya
  54. psychology

    what is muller lyer

    asked by naomi
  55. geography

    where is the safe place to live in a island and why

    asked by jessy