Questions Asked on
February 23, 2007

  1. Physics

    A person is making homemade ice cream. She exerts a force of magnitude 17 N on the free end of the crank handle, and this end moves in a circular path of radius 0.28 m. The force is always applied parallel to the motion of the handle. If the handle is

    asked by Mary
  2. winterWx

    What is the average translational kinetic energy of nitrogen molecules at 1500 K, in the following units? (a) J (b) eV I already provided the formula for average KE in Joules, in an answer to a separate question of yours. average KE = (3/2) k T 1 eV =

    asked by Physics/Math
  3. Math

    1) Which of the following ingegers can not represent the lengths of the sides of a triangle? (9,10,11) (4.7,9) (4,8,12) & (6,6,11) Try drawing the 4,8,12 triangle. Have fun. any two sides must be longer than the third. Example with set 1. 9+10>11 10+11>9

    asked by Peggy
  4. winterWx

    A soccer player kicks a soccer ball of mass 0.45 kg that is initially at rest. The force of the kick is given by F(t) = [(5×106)t - (2.5×109)t2] N for 0 ≤ t ≤ 2.0×10-3 s, where t is in seconds. (The player's foot is in contact with the ball for

    asked by Physics/Math
  5. winterWx

    Compute the rms speed of a nitrogen molecule at 31.0°C. At what temperature will the rms speed be half that value? At what temperature will the rms speed be twice that value? T = 31 C = 304 K Mass M = 28 g/(6.02*10^23) = 4.65*10^-23 g = 4.65*10^-26 kg The

    asked by Physics/Math
  6. Math

    If the measures of the angles in a triangle are in the ration 3:4:5, the measure of the exterior angle of the triangle can not be a) 120D b)165D c)105D d)135D b 165 With the triangle ratio of 3:4:5 the equation can be made: 3x + 4x + 5x = 180 x = 15 The

    asked by James
  7. winterWx

    A 0.30-kg softball has a velocity of 12 m/s at an angle of 30° below the horizontal just before making contact with the bat. What is the magnitude of the change in momentum of the ball while it is in contact with the bat if the ball leaves the bat with a

    asked by Physics/Math
  8. exponential eq: how to solve

    4-x^2 = e^-2x please. This is a transidental equation. Numeric methods, such as iteration, or expanding functions to series and computing, or graphical methods can be used. I recommend graphical.

    asked by Jen
  9. math, algebra,correction & help

    directions are: write each fraction in simplest form: (-15x^3y^3)/(-20x^1y^4) My answeris: (3x^2)/(4y) THESE TWO NEXT ONES ARE THE ONES THAT I DON'T UNDERSTAND: pROBLEM #1 DIRECTIONS: Write each expression in simplest form. (4x-28)/(5x-35) Problem #2

    asked by jas20
  10. Biology

    how many pints of blood is in an average adults body? 9 to 12 I believe 56 Facts About Blood and Blood Donation One for each day between your blood donation! 4.5 million Americans would die each year without life saving blood transfusions. Approximately

    asked by marie
  11. Stats

    2 samples were collected to determine whether there was a difference between two weight loss methods targeting men. The average weight loss method is provided for the 2 samples along with the respective standard deviations. Is the second method - with an

    asked by Jason L
  12. Physiology

    DESCRIBE THE HUMAN CELLS AND HOW THEY HARVEST ENERGY (HOW WE DEAL WITH CARBS, LIPIDS AND PROTEINS.) Thanks!

    asked by Aletha
  13. I don't know the subject maybe writing

    what is a working bibliography and how do you write one http://writing.colostate.edu/guides/trad_research/intro/pop2e.cfm

    asked by Beautiful
  14. Geometry- how to write proof

    ABC is a right triangle. Angle C is 90 degree. Altitude CD is drawn to hypotenuse AB. Prove AB/BC = BC/BD and AB/AC = AC/AD This is a theorem. How do I prove it? Thanks. Dont you have similar triangles? You can show this by looking at the angles

    asked by Jen
  15. Math

    (1) Which of the following ingegers can not represent the lengths of the sides of a triangle? (9,10,11) (4.7,9) (4,8,12) & (6,6,11) (2) The measures of two supplementary angles are in the ratio 5:1. What is the measure of the smaller triangle?

    asked by Peggy
  16. Math

    Greg needs 234 feet of baseboard to finish trimming the floors in his house. He has 145 3/4 feet of baseboard. How much baseboard does he need to buy? 233 4/4 - 145 3/4 _________ 88 1/4 Am I working this correct? Yes. That is right! :-) Yes..... I have

    asked by Alisha
  17. physics

    A 17.0 kg child travels down a playground slide 3.50 m high and reaches the bottom with a speed of 2.50 m/s. How much heat was generated due to friction as a result of this process? my teacher hadn't taught anything about heat..but he did give us this

    asked by Cathy
  18. SPANISH

    HOW DO i WRITE A SENTENCE IN SPANISH ABOUT MY FAMILY Do this: Start with a sentence about your family in English. Then translate it to spanish. Get your dictionary out. We will be happy to check it for you. mi famila es grande, el amar y bueno Thank you

    asked by jAVOR
  19. Math

    Two Congruent angles are supplementary. The measure of each angle is? If A+ A= 180, then... 90

    asked by Paul
  20. chemistry:energy level of element

    each element has a different has a different set of energy level use this fact to explain why colour of light emited by an element in gaseous state is the characteristics of the element The light emitted is characteristic of a specific set of allowed

    asked by bonita
  21. Accounting

    Is unearned revenue included in the income statement? No, only the balance sheet.

    asked by Samantha
  22. logarithmic eq:

    3logx = 6-2x Thanks This is a problem that is best solved by iteration, or graphing. I recommend graphing. There is no closed-form solution. You need to solve it by graphical or iteration (trial and error) methods. The answer is approximately 2.43, if the

    asked by Jen
  23. chemistry

    Why is the molecular formula of a gas not necessarily the same as its empirical formula? At higher temperatures, those that produce a gas, say, from a liquid, the kinetic energy of the molecule is large enough to break those bonds holding more than one

    asked by sarah
  24. Statistics

    In a study that was highly published doctors discovered that aspirin helps prevent heart attacks. The research project which was scheduled to last 5 years employed 22,000 american physicians (all male). Half took an aspirin tablet 3 times a week while the

    asked by Jason L
  25. What is so amazing about Shakespeare's plays?

    Why do we have to learn Shakespeare in English? Most of his plays aren't even original. IMHO -- He was an ordinary man who managed to put together an amazing array of plays and other writings intended for the ordinary people during his time, not just for

    asked by Anonymous
  26. Business law

    The Supreme Court threw out a $79.5 million punitive-damages award against cigarette maker Philip Morris. The high court voted 5-4 to overturn the jury verdict in the Oregon case, ruling it violated earlier high court decisions on limits to punitive

    asked by Mike
  27. Calc easy

    Having trouble getting the correct solution. The integral of “x squared” in the numerator and “x squared plus x minus 6” in the denominator. S X2 / (X2 + x – 6) dx Thanks! That's a messy one. According to my table of integrals. The answer is -x/6

    asked by Ang
  28. maths complex numbers

    Can abs(28-7w)=7abs(w) be written as abs(w-4)=abs(w) and if so why surely it should be abs(4-w)=abs(w) can any one explain why I can just chane the signs Yes, it can be written that way. I don't see that you have changed any signs, you factored a postive

    asked by Jake
  29. maths

    For the transformation w=z^2, find the locus of w when z lies on the imaginary axis. I thought the locus would be a line along the real axis as I thought w= r^2 or -r^2 but the book says it has argument pi which would mean only on the negative real axis ie

    asked by Jake
  30. Physics

    A basketball player makes a jump shot. The 0.700 kg ball is released at a height of 2.10 m above the floor with a speed of 7.30 m/s. The ball goes through the net 3.10 m above the floor at a speed of 3.10 m/s. What is the work done on the ball by air

    asked by Mary
  31. Stats

    the director of an insurance companies computing center estimates that the companies computer has a 20% chance of catching a computer virus. However they feel that there is only a 6% chance of the computers catching a virus that will completely disable the

    asked by Jason L
  32. Math

    Solve for X: 4x - 2 +7 = 17 collect like terms on left hand side 4x + 5 = 17 subtract 5 from each side 4x = 12 divide by 4 on each side x = 3

    asked by Peggy
  33. algebra PLZ HELP!!!

    y= 9/11x-17 9x-10y=179 You need to use parentheses to tell us what the problem is. Is equation 1, y = 9/(11x-17) or is it y = (9/11)x - 17? y= 9/11x-17 9x-10y=179 Rewrite them as 11 y - 9 x = -187 and -10 y + 9x = 179 Add the last two and you get y = -8

    asked by andrea
  34. Writing

    I am writing an introduction for a history fair project, my thesis is approved all I need to know is hoe my form of my introduction should go. You know where to put the thesis and where to start off and how to be a,b, and c where it needs to be. A good

    asked by Beautiful
  35. maths

    Hi, could someone please tell me how I would go about working these out: (the answer must be in the form a(sqroot)b where a and b are integers and b is as small as possible.) 1) Simplify (sqroot)500 2) Simplify (sqroot)50 x (sqroot)60 Also.. Simplify the

    asked by em
  36. Math

    The expression (3x+4) (2x-6) is equavalent to? 3x(2x-6)+4(2x-6) multipy out brackets to give: 6x^2 - 18x + 8x - 24 collect like terms to get: 6x^2 - 10x - 24

    asked by Mark
  37. geography

    what would be some simple sanitation uses in australia? and you were usin tools made by yourself. the location of australia is in the area of west and south Gippsland. also including Wilsons Promontory, Victoria I'm not sure what you mean by "sanitation

    asked by Philo
  38. chemistry

    Why is the molecular formula of a gas not necessarily the same as its empirical formula? answered above.

    asked by sarah
  39. math

    The measures of two supplementary angles are in the ratio 5:1. What is the measure of the smaller triangle? A/B = 5 A + B = 180 Solve those 2 equations in two unknowns. B is the smaller angle. Hint: substitute 5B for A in the second equation. Then only B

    asked by Peggy
  40. phone charges project

    Okay I need to know something about cell phones and land lines. My parents can't answer this because we don't have a land line anymore. We just have cells phones. Okay my question is if someone with a cell phone calls a land line person long distance will

    asked by Kayla
  41. spanish

    mi familia es grande, el amar y bueno. Is the ok? Don't say the bueno because that means and.... Here's what your saying: my family is great, good loving and. Get me??? Thank you for using the Jiskha Homework Help Forum. Please supply exactly what you wish

    asked by JAVOR
  42. Math

    In two inequalities below,both a and b are integers.how many values do a and b have in common? 4< a < 21 12< b < 24 - a can be 5, 6, .. 19 or 20 b can be 13, 14, ...22 or 23. Both a or b can be integers 13 through 20. Those are the "values in common" to

    asked by Anonymous
  43. Physics

    A 50g mass (M1) will be attached to the trolley M2) and will cause it to accelerate a distance of between .5 to .6m. You also catch the trolley immediately after it has passed through the photogate. The time for the trip will be noted and recorded. The

    asked by Tammy
  44. Survey

    What first comes to mind when you see or hear the word blood? red, then death, then if i kept thinking, it wouldn't be a first thought sang -- as in the latin base

    asked by Marie
  45. math ..PLEASE HELP !!!

    A local bank reports that 70% of its customers maintain a chequing acct, 50% have a savings acct and 40% have both.If a customer was chosen at random a) what is the probability customer has a chequing or saving acct b)probability the selected customer has

    asked by Linda
  46. math

    wat is dilation in math during moving or changing a figure

    asked by jose
  47. Math-- Fractions-- I Desperately Need Help!!

    I need help with this problem. Estimate 16 20/21 times 28 3/7 minus 4 13/25 plus 8 2/47 as a whole number or as a mixed number where the fractional part is 1/2 (Possible answers) One is the correct answer. A. 452 B. 480 C. 488 D. 492 1/2 I have tried to

    asked by Victoria
  48. To Jiskha

    I have one question: Whatever happened to the Instant Messaging thing which helped me alot when I was doing my homework? I wish that you could put it back on. My friends and I which I recommended to the site loves the message boards but they are not fast

    asked by Beautiful
  49. Where are the teachers?

    I really need help and no offense but I would prefer Dr.Bob or Writeacher or somebody that knows what they're doing. Where are they? okay well i'm not a teacher but i will try to help if i can. i'm a tutor if that gives you any confidence Okay, how do you

    asked by Me
  50. bobpursley,math

    about this problem , I figured it out and i did get the answer right except that i had forgotten to make it a negative like this: directions: subtract 4x-2x^2+4x^3 from 4x^3+x-3x^2 -------------------------------- 4x^3-3x^2+x -(4x^3-2x^2+4x)

    asked by jas20
  51. math

    rewrite each equation as afunction of x.-3y+4y=11 Where are the equations? rewrite this equation as a function of x.-3y+4y=11 y=x

    asked by stacy
  52. math

    Substitute -1 for x. Simplify. If f(x) = 4x-3, find the following. f(-1)

    asked by MathGuru
  53. solving logarithmic inequality

    0.2

    asked by Jen
  54. Math

    Evaluate: (-1)^25 (-2)^3 well, the negative one to an odd power is negative one. -2 cubed is -8. What is negative one times negative eight>?

    asked by Ann
  55. math

    Whatwould be the answer 3+9+6+52x963+??? The answer depends upon where you put the parentheses. The order of operation makes a big differnece The answer depends upon where you put the parentheses. The order of operation makes a big differnece I agree with

    asked by Crystal
  56. Math-- Please Check

    1 2/5 divided by 21 Which example is correct 7/5 * 1/21 = 7/105 = 1/15 or is it? 5/7 * 21/1 = 105/7 =15 You asked this question yesterday. The answer is still the same.

    asked by Bobby
  57. Bacteria

    What structural features of bacteria do you think help them to survive? Name four characteristics of bacteria that aid them in producting disease. http://en.wikipedia.org/wiki/Bacteria please read the link and then think about these statements: fast

    asked by Sabrina
  58. Math

    What is the product of 5x^2 and 3x^5? exponents add, so 15x7

    asked by Mark
  59. Math

    The measurement of the angles of a triangle are in the ration 1:3:5, the number of degrees in the measure of the smalles angle is x+ 3x + 5x= 180 what is x?

    asked by Ann
  60. math,bobpursly,

    4x-2x^2+4x^3 from 4x^3+x-3x^2 4x^3+x-3x^2 -( 4x-2x^2+4x^3) then changing signs and rearranging terms. 4x^3+x-3x^2 -4x^3-4x+2x^2 answer after ADDING the above.. -3x - x^2 so for the answer isn't it the same as what i had -x^2-3x doesnt' x^2 goes first then

    asked by jas20