Questions Asked on
November 8, 2008

  1. physics conservation of momentum

    A 0.5 kg ball is thrown horizontally towards a wall with a speed of 10 m/s. The initial velocity is chosen to be the positive x-direction for this question. The ball horizontally rebounds back from the wall with a speed of 10 m/s in the negative

    asked by rachel
  2. college chemistry-thermochemistry

    A 1.50g sample of NH4NO3(s) is added to 35.0g of water in a foam cup and stirred intil it dissolves. The temperature of the solution drops from 22.7 to 19.4 degrees celcius. What is the heat of dissolution of NH4NO3, expressed in kJ/mol NH4NO3?

    asked by maryanne
  3. organic chemistry

    Determine the percent composition of your unknown mixture. My data for refractive indexes for acetone is 1.365 and water is 1.330. This is what my unknown mixture was composed of. How do I use this info to find percent composition of each compound?

    asked by Jenn
  4. japanese :)

    anyone really good at Japanese writing and stuff? :D because i could use some help with some of my exam preparation and sentence structures and stuff :) ( i will add your email address if that's okay) domo arigatou ^^"

    asked by remi
  5. chemistry

    Calculate the heat of formation of SiO4(s), given that the heats of formation of SiO2(s), -910.90 KJ/mol; H2O(l), -285.8 KJ/mol; HF (g), -271.1 KJ/mol. I know the heat of formation is products minus reactants but how do i do this when no reaction is given

    asked by matt
  6. science...help

    name the covalent compounds SCI6 CS2

    asked by Anonymous
  7. math

    a rectangular box with a volume of 60 ft^3 fas a square base. Find a funtion that models its surface area S in terms of the length x of one side of its base

    asked by lauren
  8. chemistry

    what is the best combination for preparing CH3CH2CH2CH2OCH3 is CH3CH2CH2CH2OH+NaOCH3 CH3CH2CH2CH2ONa+NaOCH3 CH3CH2CH2CH2Br+NaOCH3 CH3CH2CH2CH2Br+CH3Br

    asked by Jake
  9. chemistry

    The reaction of sec-butylmagnesium bromide with formaldehyde followed by hydrolysis yields? 2,2-dimethyl-1-pentanol 2-butanol 2-methyl-1-butanol 2-pentanol 2,2-dimethyl-1-propanol

    asked by Jake
  10. math/physics

    a ball with mass 0.15 kg is thrown upward with initial velocity 20 m/sec from the roof of a building 30 m high. there is a force due to air resistance of |v|/30, where velocity v is measured in m/sec. a. find the maximum height above the ground the ball

    asked by cyrus
  11. chemistry

    what is the best synthesis of 2-methyl-2-pentene (CH3)2C=CHCH2CH3? 1.(CH3)2CHCH2CH2CH3+F2,heat 2. KOC(CH3)2 1.(CH3)2CHCH2CH2CH3+Cl2,heat2.NaOCH2CH3 1.(CH3)2CHCH2CH2CH3+Br2,heat2.NaOCH3 1.(CH3)2CHCh2CH2CH3+I2,heat2.NaOCH2CH3

    asked by Jake
  12. chemistry

    Write balanced half-cell reactions and equations for the following: Mo24O37(s) + MnO4-(aq) makes MoO3(s) + Mn+2(aq) (BASIC)

    asked by kate
  13. chemistry

    Calculate the number of grams of reactant left over when 28.35 grams of silver reacts with 50.0 liters of air at STP which is 20.9476 % oxygen by volume. The density of air at STP is 1.292 g/L. attemtp at solution volume of oxygen= .209476*50L=10.5L How do

    asked by jason
  14. chemistry

    C6H5NO2+? = C6H5N2Cl

    asked by Jake
  15. physics- check my answers)

    An ice skater of mass 50kg moving at 10 m/s coasts to a halt in 100 m on a smooth ice surface a. calculater acceleration of the skater (.5 m/s) b. what is the force of friction between the ice and the skates? (25 N) c. calculate the coefficient of friction

    asked by lauren
  16. 11th grade-Math!

    an air traffic controller spots two planes at the same altitude flying towards one another. their flight paths form a right angle at point p. One plane is 150 miles from point p and is moving 450mph. the other plane is moving at 450mph but is 200 miles

    asked by Amy
  17. maths please check my answer

    paul orders a pizza. chef carl randomly chooses two different toppings to put on the pizza from the following:~ pepperoni, onion, sausage, mushrooms and anchovies. if paul does not eat pizza with mushrooms, determine the probablity that paul will not eat

    asked by Anonymous
  18. physics

    A 20 kg sled rests on a horizontal surface. if it takes 75 N to start the sled in motion and 60 N to keep it moving at a constant speed, what are the coefficients of static and kinetic friction respectively? explain please

    asked by kim
  19. science

    the result of all 3 physicl tests shown are most useful for determining the 1.. rate of weathering of the minerals 2.. identity of the minrels 3.. envoronment for the minerals formed 4.. geologic period when the minerals formed

    asked by Anonymous
  20. SAT Essay

    Is compromise always the best way to resolve a conflict? Plan and write an essay in which you develop your point of view on this issue. Support your position with reasoning and examples taken from your reading, studies, experience, or observations.

    asked by Sahil
  21. social studies

    hi can someone help me with these two questions 1. The bank of the US a. refuesed to engage in corruption b. fostered "wildcat" Western banks c. was partly foreign owend d. issued unsound currency I think the answer is B 2. Federal internal improvements in

    asked by bill
  22. college chemistry-thermochemistry

    i have one more question: I know this one has to do with hess's law but i'm not sure of how to get the enthalpy of vaporization from this? Clculate the enthalpy of vaporization of solid potassium bromide to a gas of ions, the process

    asked by maryanne
  23. Math and Society

    You can afford monthly payments of $1200. If current mortgage rates are 7.5% for a 30-year fixed rate loan, what loan principal can you afford? If you are required to make a 20% down payment and you have cash on hand to do it, what price home can you

    asked by Michele
  24. 11th grade-Calculas

    An animal will defend the region around its home by attacking intruders that come in to the region. According to the statistical studies reported in J.M. Emlen's Ecology: An Evolutionary Approach, the defended region's area varies directly with the 1.31

    asked by Amy
  25. social studies

    Hi can someone help me please with this question 1. The mormons achieved success in Utah primarily because of a. economic individualism and free enterprise b. rejection of foreign immigrants c. economic cooperation and collectivism d. cooperation with the

    asked by bill
  26. maths

    john has a total of 9 stamps, which consists of 25-cent and 2-cent stamps. his stamps have a value of $1.10. how many of each stamp does john have?

    asked by jess
  27. torque problem!

    A spring (k =819N/m) is hanging from the ceiling of an elevator, and a 5.1-kg object is attached to the lower end. By how much does the spring stretch (relative to its unstrained length) when the elevator is accelerating upward at a = 0.46m/s^2?

    asked by Cecilia
  28. 3rd grade music

    Song, "America" by Neil Diamond. In stanza 7, "Got a dream they've come to share" what does this line mean and what do the people have in common.Use examples from song to support answer.

    asked by elaine
  29. HR but about Special Education Teachers

    Answer the following questions about a new employee training program for the position you selected for your final project: (final project Special Ed Teacher) 1. Needs assessment: What types of issues might indicate a need for training? From what sources

    asked by Christi
  30. 11th grade

    A uniform plank of length 6.0 m and weight 231 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the drawing). To what distance x can a person who weighs 451 N walk on the overhanging part of the plank before

    asked by Cindy
  31. Science/English

    Here is my Science presentation, I'm having trouble with the last two sentences. What would you put as the last two sentences? Computer Technology My presentation is about how computers have changed from the past to the present. Then what I think is going

    asked by Sammi
  32. English game

    Find a Person Who Game (1) Directions : Hello, class. Today we are going to play the Find a Person Who Game. I have prepared a sheet of paper for you each. Write the numbers 1 through 16 in the squares above. You can put them in any order you would like.

    asked by John
  33. English/Grammar

    I have a comma question! When using the phrase "as well as" do i put the comma before, after, or before AND after the phrase. An example sentince is: At the store i bought milk as well as bread.

    asked by Abby
  34. geometry

    please help find answer. very urgent. triangle PQR is a 30-60-90 triangle with right angle Q and segment PQ as the longest. Find the possible coordinates of R if (2,6) and Q (2,-6). please help

    asked by chippy
  35. intergrated science

    can u unsramble this word for me please the assatiepr

    asked by jade
  36. Differential Calculus

    use the rule that says limit of (e^h - 1)/h = 1 as h approaches 0 to show that the limit of [ln(x+h) -lnx]/h as h approaches 0 = 1/x, where x>0

    asked by Kristen
  37. Chemistry

    I need help with getting started: 1.The crystal structure of an ionic compound consists of alternating cations and anions lying next to each other in three dimensions. If the cation radius is 55.1% of the anion radius and the distance between the cation

    asked by Cathy
  38. science

    in the year 1971. astronaut alan shepard hit a golf ball whila on the surfase of the moon. it became the longest golf shot in history alan shepard was able to hit his recod golf shot because A.the moon dods not have any gravity B.THE GRAVITY OF THE MOON IS

    asked by steven
  39. accounting

    Calculate margin, net income, and ROE For the year ended December 31,2009, Ebanks, Inc. earned an ROI of 12%. Sales for the year were $96 million, and average asset turnover was 2.4 Average owners equity was $32 million. Calculate Ebanks, Inc.’s margin

    asked by MURIEL
  40. Chemistry

    I need help with getting started: 1.The crystal structure of an ionic compound consists of alternating cations and anions lying next to each other in three dimensions. If the cation radius is 55.1% of the anion radius and the distance between the cation

    asked by Kate
  41. environmental studies

    What landfill and waste characteristics would be best suited to a bioreactor process?

    asked by Thano
  42. History

    How many years has it been since the first century to today?

    asked by Sammi
  43. global ...help

    the ancient athenians are credited with 1inventing and using the wheel 2 eliminating sanvery 3 inventing the printing press 4 esablishing governments that had democratic elements.

    asked by Anonymous
  44. chem

    a compound containing only boron, nitrogen and hydrogen was found to be 40.3% B, 52.2%N, and 7.5% H by mass. If 3.301g of this compound is dissolved in 50.00g of benzene, the solution produced freezes at 1.30 degrees celsius. If Kf(freezing point

    asked by tomi
  45. biology

    Why do bamboos have leaves that encircle the stem? (Is it for some kind of structure support?) Also, why are there leaves at the top of the plant on lateral branches? There is graffiti at the base of some of the bamboo shoots. Why doesn't the graffiti grow

    asked by Anonymous
  46. health care

    If the health care organization is going to use advertising; should there be any restrictions on what the ad may contain?

    asked by april
  47. french

    comment dit-on "donuts"? so "do you like donuts?" would be "tu aimes ....?" merci

    asked by amanda
  48. Environmental Studies

    How does landfill gas move in the environment?

    asked by Thano
  49. Environmental Studies

    When does methane production occur in a landfill and when is it profitable?

    asked by Thano
  50. Maths

    two algebra questions which i need for Tuesday. 1. when h is 105 what is n in the following formula: n(n+1) ------ 2 2. the same as question one but this time h is 5050

    asked by Rebecca
  51. Law

    The Canadian Charter of Rights & Freedoms is a bill of rights. How to I do explain what a 'bill of rights' is to someone about 5 years of age?

    asked by Lena
  52. eth 125

    hat are some way Japanese Americans have maintained levels of economic success since WW II

    asked by Anonymous
  53. Math

    It is kind of logic question that deals with math. A Contractor needs 54 square feet of bricks to construct a rectangular walkway. What does that mean? Please explain very clearly.

    asked by R
  54. calculus

    use the rule that says limit of (e^h - 1)/h = 1 as h approaches 0 to show that the limit of [ln(x+h) -lnx]/h as h approaches 0 = 1/x, where x>0

    asked by Anonymous
  55. physics

    A soild wheel initially rotating at 50.0 rad/s comes to a uniform stop after 8.00 rotations. Calculate the tangential accleration at the rim. Given that the angular acceleration is -24.9 rad/s^2. I know its aT = r alpha but how do I get the radius?

    asked by Rod
  56. English

    There are four types/purposes of Communication 1. Exposistion 2. Narration 3. Description 4. Argumentation can someone give me a definition and an example of Exposistion? thanks. :)

    asked by Akitsuke
  57. Math check

    Solve: 3x^2-11=0 Is the answer" +- sqrt 11/3?

    asked by Shawn
  58. Writing

    i have to do a research paper for journalism class. It has to be something that has to do with washington, d.c. but the topic cant be too generalo. it has to be something specific that i will be able to write 1,500 to 3,00 words. Also, the topic has to

    asked by ELLEN
  59. physics again (check answers please)

    What net force increases a velocity of a car from 20 m/s to 35 m/s in 8.0 s if the mass of the car is 1600 kg? (3000 N). What force would cause the car to stop? (3000N) What coefficient of friction is needed to supply the force of friction? (.0191) are

    asked by lauren
  60. biology

    You are conducting an experiment to determine whether lichen populations are affected by local airborne pollutants. Which of the following observations would best support your hypothesis that high levels of pollutants in rainwater cause a reduction in

    asked by Anonymous
  61. Calc

    cylindrical can is to be made from a rectangular piece of aluminum that is 25 inches long and 10inches high by rolling the metal horizontally. Determine the circumference of the cylinder, the radius of the cylinder, the height of the cylinder, and the

    asked by Kelley
  62. 11th Grade-Calc

    cylindrical can is to be made from a rectangular piece of aluminum that is 25 inches long and 10inches high by rolling the metal horizontally. Determine the circumference of the cylinder, the radius of the cylinder, the height of the cylinder, and the

    asked by Kelley
  63. biology

    Why do bamboos have leaves that encircle the stem? (Is it for some kind of structure support?) Also, why are there leaves at the top of the plant on lateral branches? There is graffiti at the base of some of the bamboo shoots. Why doesn't the graffiti grow

    asked by Anonymous
  64. chemistry

    i need help with a balanced equation for the displacement of aluminum in the soil and H+ ions from acid rain? (for leaching) thanks :)

    asked by remi
  65. chemistry

    The average speed of a hydrogen molecule at 20*C is 1930m/s. What is the wavelength of the H2 molecule at this temperature?

    asked by joe
  66. Law

    What's the criteria for being a Canadian citizen? And if you are born in Canada are you automatically a Canadian citizen? Like suppose you can on vacation to Canada from some foreign country and you gave birth to your kid here, would your kid be a Canadian

    asked by Lena
  67. DDP...help

    if the accepteable range is between .745 in and .755 in, what percentage of your sample blocks would be considered unaccesptable?

    asked by Anonymous
  68. Math

    I am having a hard time with these problems and could you show me how to work them so next time i will know how. find the first and third quartiles of Q and Q of the set of numbers 11,12,16,14,14,14,8,12,10,18 find any outliers ( if any) in the set of

    asked by Gertrude Sanders
  69. physics

    A block slides down a 10 angled incline at a constant speed. what is the coefficient of sliding friction between the blocks surface and the incline?

    asked by kim
  70. french

    Q'est-ce que veut dire "n'est-ce pas"?

    asked by amanda
  71. social studies

    in harcourt bracesocial studies ancient civilizations is it true or false that steling was not a very serious crime & why

    asked by maria valecia
  72. Math

    If a famlies total living expenses are 63,000 a year. After the death of the insured, the total family income would be 55,000. How much life insurance is required to cover the dependents icome shortfall, if prevailing interest rate 4%. I am not sure that

    asked by Debbie
  73. Algebra

    Solve: 5x(x-5)-2x(x+4)=-90 Is the answer 5,6 ?

    asked by Shawn
  74. Chemistry

    what is the big idea of energy

    asked by Chinchilla
  75. sciencce

    a block slides down an angle 10 incline at a constant speed. what is the coefficient of sliding friction between the block's surface and the incline?

    asked by kim
  76. math

    what is the standard deviation of the numbers {78, 79, 81, 82, 85}. And can you tell me how i am supposed to find the standard deviation

    asked by chase
  77. Calculus

    Find the limit of (10^x - 5^x)/x as x approaches 0 without using l'Hospital's rule

    asked by Anonymous
  78. Medical transcription

    Can you please tell me if the following transcription for a Pathology report makes sense, and if it is correct? The glands'slides closed together, but afebrile's stroma separates them. Copora amylase is present within numerous glands. Papillary epithelia

    asked by Ruth
  79. intermediate algebra

    Write the equation of the line containing (-3,4) and perpendicular to y = 2/3x + 2. Write your answer in slope-intercept form. Not sure how to do this one. m = -3/2 y = mx + b y - 4 = -3/2 (x-4) am i on the right track? would I add 4 to the y side to make

    asked by jennifer
  80. math help me/....

    how do we solve this??? 2(3x-5)+12=0 and this?? 4/11 = x+6/ 2x

    asked by Anonymous
  81. math

    solve by the substitution method 3x + 6y = 27 -2x + y = 12 what is the solution of the system..(type an ordered pair, or N if there is no solution) has to be like (3,5)please help me

    asked by mikey123
  82. Math Algebra check

    Solve: 3x^2-11=0 Is the answer" +- sqrt11/3?

    asked by Shawn
  83. Organic

    Are any of the following a tertiary amine 2-methyl-2-butanamine N-Methyl-1-butanamine N-Methyl-2-butanamine

    asked by Jake
  84. organic

    Explain why glucose undergoes mutarotation

    asked by Jake
  85. speeches

    Im doing my speech on guiness world records, but i don't know how to start it. Can u help me think of something?

    asked by chantelle
  86. Math

    in 15 and 16, suppose f(x)=|x|. Find a equation for the image of f under the transformation. 15. S(x,y)=(x/4,5y) 16. T(x,y)=(x+1,y)

    asked by Trisha
  87. SOSE

    in a dictatorship who has no say in anything? and how are they excluded?? THANX!!

    asked by SAMMI^^^
  88. 6th grade English

    Why is diversity healthy within a culture?

    asked by Emma Leigh
  89. AED

    i still need help comparing these 2: comparing and contrasting approaches for teaching English language arts in a constructivist classroom and in a traditional classroom

    asked by troyer0269
  90. science

    What does ti mean to depress the scapula? Does that mean to shrug shoulders?

    asked by Lauren
  91. social studies

    what are pennsylvania 5 natural regions?

    asked by joseph
  92. maths helpppppp!!!!!!!!!!!!!!!!!!!!!!!!!!

    is this correct??? |-2+(-5)| |-2-5| |-7| 7. and how do we do this??? |-3|+|-10|

    asked by Anonymous
  93. math

    2 times the cube root of radical 3. plus the cube root of radical 4.

    asked by amanda
  94. organic

    which phenol is the most acidic? phenol 2-methyl-6-nitrophenol 3-methyl-5-nitrophenol 2,6-dimethyl-3-nitrophenol 2,4,6-trimethylphenol

    asked by Jake
  95. science

    whish of the following plantstraits not inherited gras turns darker when sprinkled whid nitrgen B.arosebush has thorns C.maple tree leaves die in the fall D.a cactus stores water

    asked by steven
  96. math

    help with ratios pleeeeeeeeeeeease or i get an f

    asked by diana
  97. Physics

    a car accs from 10 m/s to 50m/s in 8 seconds, what is the acceleration?

    asked by Tommy
  98. Calculus

    what is the limit of x/(ln x) as x approaches 0?

    asked by Jane
  99. DDP

    what phase(s) of a design process might sttistics be most applicable?

    asked by Anonymous
  100. global....help

    which ancient civilization established the basis of western democrocy?

    asked by Anonymous