Questions Asked on
March 1, 2007

  1. chemisty help

    for the reaction shown, compute the theoretical yield of the product in grams for each of the following initial amounts of reactants. Ti + 2F2 to make TiF4 There are 3 sub questions for this. Help me out with one, then I'll try to figure out the rest.

    asked by Becky
  2. Physics

    A sky diver of mass 80.0 ks jumps from a slow-moving aircraft and reaches a terminal speed of 50.0 m/s. a) What is the acceleration of the sky diver when her speed is 30.0 m/s? What is the drag force on the diver when her speed is b) 50.0 m/s? c) 30.0 m/s?

    asked by Jean
  3. Physics

    Calculate the force required to pull a copper ball of radius 2.00 cm upward through a fluid at the constant speed 9.00 cm/s. Take the drag force to be proportional to the speed, with proportionality constant 0.950 kg/s. Ignore the buoyant force.

    asked by Jean
  4. chem

    I can't seem to figure this out! I know I have to use mass to mass conversions though. Can someone help me out? Hydrochloric acid can dissolve solid iron according to the following equation: Fe + 2HCl to form FeCl2 + H2 a) How much HCl in grams would you

    asked by Abby
  5. to bobpursley

    An emergency breathing apparatus often placed in mines works via the following chemical reaction: 4KO2(s) + 2CO2(g) to make 2K2CO3(s) + O2(g) If the oxygen supply becomes limited or if the air becomes poisoned, a worker can use the apparatus to breath

    asked by Jenn
  6. Physics/Math

    A cold package of hot dogs slides rightward across a frictionless floor through a distance d = 20.5 cm while three forces are applied to it. Two of the forces are horizontal and have the magnitudes F1 = 5.00 N and F2 = 1.00 N; the third force is angled

    asked by Technoboi11
  7. Physics/Math

    A force F = (4.0 N)i + cj acts on a particle as the particle goes through displacement d = (3.4 m)i - (2.0 m)j. (Other forces also act on the particle.) What is the value of c if the work done on the particle by force F is each of the following? (a) zero

    asked by Technoboi11
  8. physics

    Consider an object on which the net force is a resistive force proportional to the square of its speed. For example, assume that the resistive forve acting on a speed skater is f=-km[v^2], where k is a constant and m is the skater's mass. The skater

    asked by Jean
  9. chemisty

    Many home barbecues are fueled with propane gas (C3H8). How much carbon dioxide in kilograms is produced upon the complete combustion of 18.9 L of propane (approximate contents of one 5-gal tank)? Assume that the density of the liquid propane in the tank

    asked by Carry
  10. chem

    Consider the following reaction: 2 CH3OH + 3O2 to form 2 CO2 + 4 H20 Each of the following molecular diagrams represents an initial mixture of the reactants. How many CO2 molecules would be formed by complete reaction in each case? How do I use the

    asked by david
  11. Calc

    The radius of a sphere is increasing at a rate proportional to its radius. If the radius is 4 initially, and the radius is 10 after two seconds, what will the radius be after three seconds? dR/dt = c R Integrating this differential equation gives you ln

    asked by Mischa
  12. Calculus

    Boats A and B leave the same place at the same time. Boat A heads due North at 12 km/hr. Boat B heads due East at 18 km/hr. After 2.5 hours, how fast is the distance between the boats increasing? You are looking at a right-angled triangle, let S be the

    asked by Mischa
  13. Geometery

    How do I solve this? On my assignment it says find the area inside the square, but outside the circle, given that the radius of the circle is 2 ft. Use 3.14 for ^ I have a picture of a square with a circle in the square, with a base 6 ft. and height 6 ft.

    asked by Hayley
  14. Physics

    With the engines off, a spaceship is coasting at avelocity of +260m/s through outer space. The ship carries rockets that are mounted in firing tubes, the back ends of which are closed. It fires a rocket straight ahead at an enemy vessel. The mass of the

    asked by Cavin
  15. Easy chem question... me=braindead, help please?

    It's been so long I forget which ones are which. My balanced equation is Sr(NO3)2 + 2KIO3 --> Sr(IO3)2 + 2KNO3. It wants the total ionic and the net ionic Thanks ^^ (not just looking for answer, want explanation too please, just a short one) In aqueous

    asked by Angie
  16. psychology

    Please note that we don't do students' homework for them. Our tutors try to give you the information to help you complete your assignment on your own. Once YOU have come up with a response to YOUR questions, please re-post and let us know what you think.

    asked by Writeacher
  17. Physics

    A bat flying in a cave emits a sound and receives its echo 1 s later. How far away is the cave wall? is it 340.29 m? the speed of sound is 340.29 m/s i believe v = d/t d = (t)(v) d = (340.29)(1) Nope but thanks for trying :)

    asked by Courtney
  18. geo area & volume

    ok it asks me 2 find the lateral area of the cylinder ( the radius is 5 n the hight is 5) can some 1 help me with this please 392.5 Prinness, I think that 392.5 is pi*r^2*h, or the volume of the cylinder. This question asks for the lateral area. Lateral

    asked by martha
  19. psychology

    The study of what motivates some of us to do well in school or on the job would fall in the area of what research? A. Cognitive B. Learning C. Perception D. Personality Drive to Achieve: that is in personality.

    asked by Lisa
  20. Physics/Math

    A single force acts on a 5.0 kg particle-like object in such a way that the position of the object as a function of time is given by x = 3.0t - 4.0t 2 + 1.0t 3, with x in meters and t in seconds. Find the work done on the object by the force from t = 0 to

    asked by Technoboi11
  21. Financial Analysis - free cash flows

    b. Do negative values of free cash flow in way alter or invalidate the notion that a company's fair market value equals the present value of its free cash flows discounted at the company’s weighted average cost of capital? Suppose a company's free cash

    asked by Tia
  22. Economics

    6. The chapter uses the analogy of a "leaky bucket" to explain one constraint on the redistribution of income. a. What elements of the U.S. system for redistributing income create the leaks in the bucket? Be specific. b. Do you think that Republicans or

    asked by Sarah
  23. Science (physics)

    You watch a distant woman driving nails into her front porch at a regular rate of 1 stroke per second. You hear the sound of the blows exactly synchronized with the blows you see. And then you hear two more blows after you see her stop hammering. How far

    asked by Courtney
  24. psychology

    Which of the following is stressed by the APA professional code? A. high levels of competence, integrity, and responsibility B. use of the scientific method in testing hypotheses C. application of scientific research methods to the study of human and

    asked by Lisa
  25. science thankx kid wat is the ring of

    asked by Lance
  26. history

    what is socratic method? i heared a lot of different stuff!! IDEAS PLZ Thank you for using the Jiskha Homework Help Forum. This is "thinking critically" and that can be done by using guided questions. Here is a good definition:

    asked by david
  27. macroeconomics

    Please note that we don't do students' homework for them. Once YOU have come up with a response to YOUR questions, please re-post and let us know what you think. Then someone here will be happy to critique your work. =) Use the circular flow diagram to

    asked by Writeacher
  28. physics problem!

    The spring constant of a toy dart gun is 4442 N/m. To cock the gun the spring is compressed 1.5 cm. The 8 g dart, fired straight upward, reaches a maximum height of 26 m. The acceleration of gravity is 9.81 Determine the magnitude of the energy dissipated

    asked by kitt
  29. physics helppp!

    The coeffcient of friction between the 7.9 kg mass and the table is 0.55, and the coeffcient of friction between the 5 kg mass and the table is 0.38. Consider the motion of the 37 kg mass which descends by the amount of y = 0.45m after releasing the system

    asked by kitt
  30. English Paper

    right so i have this persuasive research paper i have been slaving away over, and i finished it but i need a creative title and im going blank. THe topic is the sterilization of the mentally ill, (so theycant have kids) and my position is for it. I cant

    asked by emily
  31. psychology

    We don't just answer questions here. We help. So at least tell us your best thought out answer and why you chose it. Then we'll help. A truck gets stuck under a bridge. Several tow-trucks are unable to pull it ou. At last a little boy walks up and asks the

    asked by Lance
  32. chemistry

    i need to deduce the type of bonding that holds sodium cyanide together and write a balanced equation for sodium cyanide dissolving in water any help would be appreciated sarah Na^+ + :C:::N:^- Na to CN bond is ionic (more or less). C-N bond is covalent.

    asked by sarah
  33. Example Essays

    Mkay, I have a five paragraph essay due by tommorow. Its to be an example essay, but I don't have a idea OR a plan on what to write. I am confused {confuzzled} and am looking for a fairly easy example essay to write. I will need to use the Seven Sentence

    asked by Confizzled
  34. math

    wat is a corresponding angle.............. in the math 8th grade is really most of the test goin to be angles In triangles, it is the angle between two specified sides. It also refers to tha angles formed when one line cuts through two or more parallel

    asked by jose
  35. Strategy

    How are the tactical plan and the goals related to long-term objectives (LTO) and Critical Success Factors in your experience? IDK How can you be successful in reaching goals, if you don't define what your goals are and develop specific methods for

    asked by Ms Brown
  36. Thesis help

    Music lovers should look into pop, rock and r&b for a certain type of music. How does this look for a thesis statement? Ugh, I can't get it to sound right. How does this look: Music is a big part of the world today lets look into r&b, pop and rock to see

    asked by Confizzled
  37. calculus

    derivatives differentiate y=x^7/3 So far I have Y=7/3X Is this all there is to this problem? Using the power rule, you bring the exponent down, just like you did. Then, you subtract one from the given exponent to get the new exponent. 7/3 - 1 (which is

    asked by dee
  38. physics help please

    The two blocks are connected by a light string that passes over a frictionless pulley with a negligible mass. The 3 kg block lies on a rough horizontal surface with a constant coefficient of kinetic friction 0:3. The hanging block has a mass of 8 kg. The

    asked by kitt
  39. history

    Cavalry was the part of the army that was on horseback. Lots of information in these websites. =) what was the civil war

    asked by Writeacher
  40. law

    can someone help me add on or correct what i have. I have to pick from these four categories that a juvenile could fall under if an action is being made. I am putting the letters that i think fall under each action. There could be multiple for the

    asked by kln
  41. polymerization of alchohol

    CH2=CH-CH-OH | CH3 when the above compound undergo polymerizaing What is the polymer and the structure of the polymer obtained drawing should show three monomer unit. also include what type of polymerization involved in forming this polymer

    asked by bonita
  42. math

    Students in an English class need a mean of at least 90 points on four tests to earn an A. One student has scored 87,92,85. Write and solve an inequality to find what score the student needs on the next test to earn an A. 020714 I think that's it xDDD

    asked by yo katie p
  43. Inverse of log function

    Find the inverse of f(x) = log(2+x) - 4 the base is "a" Call f(x) y y = loga(2+x) -4 y+4 = loga(2+x) a^(y+4) = 2 + x x = a^(y+4) - 2 drwls, you have merely solved the equation for x. The question was to find the "inverse", so the actual answer should be y

    asked by Jen
  44. Geometry

    What is a Quadrangle, a rhombus and a parallelogram

    asked by chris
  45. statistics defns

    What is the coefficient of variation and how do I calculate it from a dataset? coefficient of variation is simply the standard deviation divided by the mean.

    asked by weldon
  46. Math

    can someone help me with figuring out Multiplying, simplifying and applications, Division and applications. Help. Do you have a specific question?

    asked by Lynn
  47. financial mathematics

    Qn 1. The easy loan company has a finance charge of 0.089% per day on out standing balances.What is the effective rate? Qn 2. Seven days after Jay's company borrowed R10,000,000 interest to the amount of R37,876,71 had to be paid. The simple interest rate

    asked by rita
  48. Calculus

    How do you prove area of a circle? Integrate an incremental area dArea = r dr dTheta from r=0 to R, and Theta from zero to 2PI radians. Area= INT INT dTheta rdr dTheta Area= 2PI (1/2 R^2)= PI R^2

    asked by Abigail
  49. Magical Realism

    I need help thinking of topics for a magical realism paper Read through some of the articles in here, and maybe something will

  50. financial mathematics

    jeromeborrowed an amount of money on 16th june 1999. he has to pay Ri7500 back on 25th feb 2000. what was the amount borrowed if simple interest of 26% is chargedd? qn 2. For 20yrs sidney deposited R200 every month into an account. this account earned 15%

    asked by rita
  51. social studies

    What is the capital city in the African country?Also What Pyrenees mountains boreder Spainand this European counttry? Capital city in WHICH African country? There are many countries on the African continent. Go to and enter pyrenees

    asked by Anonymous
  52. Physics

    The wavelength in air of a sound is 5 m. (a) What is the frequency of the sound? Sound can have any frequency. It is the SPEED of sound that remains constant, independent of frequency, at a given temperature.

    asked by Courtney
  53. algebra

    Can someone help me with this problem please? rationalize the denominator and simlify the answer: 5/2 + the square root of 3 Do you mean 5/(2 + sqrt 3) ? What you wrote could also be interpreted as 2.5 + sqrt 3. You need to be more careful to use

    asked by Maria
  54. math

    how do you check an answer if 4(j-7)=12 4j-28=12 -16=4j j=4 is this rite?how do you check if rite? It is wrong. When you add 28 to both sides, one gets 4j= 40 j= 10 in baseball, the pither's mound is 6 in. more than 20 yd from home plate . how many feet is

    asked by david
  55. "It Happened To Nancy'

    How do you feel about what happened to Nancy? *My homework is to create a table showing what people felt about what Happene to nancy. Thank you for using the Jiskha Homework Help Forum. I answered this earlier but I see it didn't post. First of all, make a

    asked by Margie
  56. U.S. HISTORY

    how does the philosophy of franklin roosevelt resemble the philosophy of modern day Democratic party? The Democratic party still favors Social Security, Deposit Insurance, unemployment insurance and regulation investments to try to prevent fraud. It

    asked by INEEDHELP!!!
  57. Physics/Math

    Two vectors are given by a = 3.3i + 6.5j, and b = 2.5i + 4.9j. Find a) a·b = b) (a + b)·b = c) the component of a in the direction of b = a) (3.3x2.5) + (6.6x4.9) = b) (5.8x2.5) + (11.4x4.9)= c) (a·b)/(magnitude of b)= Great! I got it :)

    asked by Technoboi11
  58. Dr Bob 222

    You answered a earlier post on a question for someone with the same question I am trying to answer. The hydrolysis of tocainide you stated only the NH2 group hydrolyses NH2 + HOH -> NH3^+ OH^- I understand that part but I need to understand why the amimine

    asked by Lucy
  59. ela

    thankx who is alice walker Lots of information in these websites. =)

    asked by jose
  60. Science

    Maybe "sleep mode"? =) This was an extra credit Q on a 6th grade science test.. "What do we call the period of hibernation by

    asked by Writeacher
  61. Econ T/F

    yes, its a true or false question is this a true or false question? Suppose that after a price change, the income effect is zero, but the substitution effect is not. For such a good, the quantity demanded is directly related to its price. oh well I think

    asked by Elle
  62. Physics/Math

    A can of sardines is made to move along an x axis from x1 = 0.2 m to x2 = 1.2 m by a force given by F = iF0exp(-0.4x), with x in meters and F0 = 4.5 N. (Here exp is the exponential function.) How much work is done on the can by the force? Work is the

    asked by Technoboi11
  63. chemistry

    HOw can you make a low calorie gel with aspartame? How does it work? Thanks. Perhaps another tutor will understand your question but I don't. Perhaps you can clarify the question? Jello is available with aspartame and it is low calorie. Yeah, we were told

    asked by Ally
  64. Science

    There are more earthquakes along the western coast of the United States than along the eastern coast. Explain. thank you Where do earthquakes tend to occur, in terms of the tectonic plates of the earth?

    asked by Prinness 49
  65. physics

    (a) What is the wavelength of a 450 Hz tone in air?

    asked by Courtney
  66. Geometry

    Find the area of the polygon 9 in. by 11 in. height 3 wouldn't it be 30 in^ It depends on the polygon.

    asked by Fionna
  67. math

    Ok The Galtins are buying a carpet for their home. They need about 1,175 square feet of carpet. The carpet they buy is sold by the square feet. What is the estimate of number of yards the Galtins need for thier home? divide square feet by 27 to get square

    asked by oath
  68. math

    I don't want to get this wrong for this homework that i have to turn in can someone please relook at it and tell me if it is correct plz.... solve. x^2+3x-18 my answer is x=3 and x=-6 yes.

    asked by jas20
  69. Math

    i need help finding the slope of the line that passes through each pair of poinst. 1. (1,-3),(4,3) 2.(5,0), (-2,1) Divide (y2 - y1) by (x2 - x1). For (1), this would be 6/3 = ? Thank you. The first one came out to 2. The second one is not working out. I

    asked by Elizabeth
  70. math

    How do you find the slope of y=-3/4x+5 (5*1000)+(3*1000)+(7*10) 15%times360=

    asked by Dominique
  71. Geometery

    A water storage tank is shaped like a circular cylinder with half of a sphere at each end. Find the volume of the tank if the cylindrical section is 100 cm long with a 40cm diameter. Use 3.14 for ~~ Be sure to round the final answer to two decimal places.

    asked by Hayley R.
  72. science DrBob222NEED BY TOMMOROW MORNING AT 9:30!!

    I need a website where you can find out about women in the field of engineering THANX :) Hope these are of some help. (Broken Link

    asked by vahnna
  73. social studies

    how did women help prepare for the civil war??? i cant find in s.s book you should double check your book. if you cant find it in there you could use the internet, but i would check the book

    asked by avery
  74. drwls, or other tutors

    does my last postage seem correct for the answers that i got. The one that doesn't have a reply. See previous reply to your post.

    asked by jas20
  75. physic

    What does "seven earths" as mentioned in surah al-Talaq acctually mean? It means that, according to the Quran, Allah created seven heavens, each contining one earth.

    asked by suhana
  76. chemistry

    Please can someone help me before i pull all my hair out i've been struggling with this for about a week CH2=CH-CH-OH ________' _______CH3 i need to polymerize this compound and draw the structural formula it needs to contain three monomer units and i need

    asked by sarah
  77. English

    Just wanted to know if my answers are correct. Dangling Modifiers If your baby does not like cold apple juice, it should be heated. My answer: 1. If your baby does not like cold apple juice, the apple juice should be heated. When they are fresh, eating

    asked by Ashley
  78. calculus

    I am having trouble with this problem also derivative differentiate f(x)=(3-x)^4(x+5)^3 so far I have 4(3-x(x+5)^3+3(x+5)(3-x) Not quite right. Treat it as d/dx[u(x) + v(x)] = u dv/dx + v du/dx u(x) = (3-x)^4 v(x) = (x+5)^3 du/dx = -4(3-x))^3 (using the

    asked by dee
  79. Geometry

    Find the perimeter of a rectangle that is 12ft. by 4 1/2 ft. 12+12+4.5+4.5= 33 how old are u?

    asked by Fionna
  80. Econ T/F

    A consumer with a fixed income buys two goods, X and Y. If her demand for both X and Y are unitary elastic, she must spend an equal amount on each good. take a shot, what do you think, and why? i think false, she doesn't have to spend equal amount?? I

    asked by Elle
  81. law

    can someone help me add on or correct what i have. I have to pick from these four categories that a juvenile could fall under if an action is being made. I am putting the letters that i think fall under each action. There could be multiple for the

    asked by kln
  82. History

    What was the first nature reserve? In the US? =) Please check the history section of the above web site for a nature preserve in the third century B.C.

    asked by RHIANNON

    What is the name of the first nature reserve Yellowstone National Park, established in 1872, is the world's oldest nature reserve.

    asked by Rhiannon
  84. math

    can someone show me the steps for this problem because i got it incorrect in my exam. Solve each of the following quadratic equations. 4x^2=13x+12 what i had put was that x is 3/4 and x is -4 but i just got my result back and it was wrong... 4x^2 -13x _12

    asked by jas20
  85. Chemistry

    How come two non-polar substances are able to easily mix? Like dissolves like. Yes, I know that, but is there any explaination to that relating to the bonds?

    asked by Raj
  86. Math!

    Factoring Completely! 13b^2-13 I got (13b-13)(1b-1). On my test my teacher said it was party wrong.And she underlined the two Thirteen's i had in my answer. And i don't understand why!? _______________________________________ Also on another one.The

    asked by megan
  87. science what is the artic circle? what is the line of cancer and capricorn?

    asked by Lance
  88. Language/Grammar

    Is (like) a linking verb? When used as a verb, "like" is an action verb. He likes her. She likes ice cream. They like their new coach. =)

    asked by Michelle
  89. stocks

    When IBM announces its intention to split its stock, let us say a split of 2:1, the news is interpreted as reducing the volatility of the DJ30, and it sometimes leads to an increase in the IBM share price, adjusted for the split. Explain the possible

    asked by joe
  90. Physics/Math

    What work is done by a force (in newtons) F = 3.1xi + 3.1j, with x in meters, that moves a particle from a position r1 = 2.1i + 2.5j to r2 = - -4.9i -3.9j? Work is the dot product of Force and displacement. Change in displacement is r2 minus r1. I will be

    asked by Technoboi11
  91. Science - Volcanos

    In science were doing volcanos, earthquakes, tectonic plates and things like that. I'm looking for a site or perhaps you could tell me, a site that show how volcanos are awoken and erupt and stop bu not in so much detail like wikipedia. That was a

    asked by VampirexGabrielle
  92. Science

    How are the lower mantel and the inner core different? How are they the same?

    asked by Prinness 49
  93. ela

    wat do u think bout the author sterling brown back in the 1900's

    asked by ANAIS
  94. sports

    um...wasn't it the colts? wo won the super bowl in football no lik i sed

    asked by Margie
  95. Math

    Does unit rate always have to be on the bottom of a ratio? No.

    asked by Kathy
  96. science

    Name at least two processes that change Earth's surface quickly.

    asked by Prinness 49
  97. Science

    Which fish can live out of water for days at a time? isnt it like the snakehead or something? Well I heard of a speices of "alien meat-eating fish that can live up to like three days out of the water. But they were like some experiment or something. I

    asked by michael
  98. english

    What strategies might you use to communicate the use of data effectively in written business reports? You can write briefly and succinctly. Use of graphs and tables are also useful.

    asked by jenna williams
  99. english

    What quailities of an oral presentation are most important to you as an audience member? Explain your answer. eye contact, standing still, no distracting movements (hand guestures good if used effectively), don't just read speech, loud and clear voice, etc

    asked by jenna williams