Recent content by jKotha

  1. J

    How would you prepare a 500 ml lab stock of:

    Homework Statement How would you prepare a 500 ml lab stock of 20% (w/v) SDS That is all that is stated in the problem. Homework Equations I'm assuming for w/v the volume would be 0.5L but the weight I'm not sure. The Attempt at a Solution 0.5L x .20 = .1g SDS / .5 L .. is...
  2. J

    Help with Algebra: Circuits & Equations

    Please look at the attached Microsoft word document because I don't know how to write out everything in this template. I need help with algebra, thanks!
  3. J

    Algebra help, Kirchoffs rule problem.

    Nevermind.. I"m stupid.. I figured it out. Thanks man.
  4. J

    Algebra help, Kirchoffs rule problem.

    yes.. 4E/R - 9I3/2 = I3 x 2 8E/2R - 9I3 = 2I3
  5. J

    Algebra help, Kirchoffs rule problem.

    I multiplied both sides of the equation by 2.
  6. J

    Algebra help, Kirchoffs rule problem.

    I don't understand.. How did I do 2 things? If I'm left with 8E/2R = 11(I3), then finding I3 would be dividing both sides by 11, which would not give me the correct answer. Also, that doesn't explain where she got the 2I3/2 on the right side. Thats what I'm concerned about. Still...
  7. J

    Algebra help, Kirchoffs rule problem.

    Hey guys, I'm having a little trouble with some basic algebra. I'm working on solving for currents using kirchhoffs rule. 4E/R - 9I3/2 = I3 Trying to solve for I3... I should get: 8E/2R -9I3 = 2(I3).. and then 8E/2R = 11(I3).. and then I3= 4E/11R However I am looking at my teachers...
  8. J

    Is there a simpler way to solve for time in this algebraic equation?

    where did the 4.9 come from? nevermind.. figured that out.. THANKS!>. i feel really dumb now because i should have known that.. sometimes i complicate myself too much.
  9. J

    Is there a simpler way to solve for time in this algebraic equation?

    hey hey.. I need help again. I can't believe I've forgotten my simple algebra. Anyway.. is there a way to solve the following without using the quadratic equation? 0 = (22)t + 1/2(-9.8)t^2 I'm tryin to isolate t, so i can solve for time. I know you can factor it out as...
  10. J

    Algebra Help for Physics: Solving for Dtruck with Speed and Distance

    Doc, you are a genius. One of a kind. Thank you.. i really appreciate it. I should have already known that.
  11. J

    Algebra Help for Physics: Solving for Dtruck with Speed and Distance

    but wouldn't that take away the dtruck that i want? (dtruck)(88km/hr) - (dtruck)(75km/hr) wouldn't that take away the dtruck?.. and just leave 10km/hr. That can't be right.
  12. J

    Algebra Help for Physics: Solving for Dtruck with Speed and Distance

    thanks.. but still not totally getting it don't think. If i do that.. I get this right? (dtruck)(88km/hr) = (dtruck + 110m)(75km/hr) (dtruck)(88km/hr) = (dtruck)(75km/hr) + (110m)(75km/hr) Now I'm stuck again.. i feel stupid. I know I should be able to islolate dtruck, but how.
  13. J

    Algebra Help for Physics: Solving for Dtruck with Speed and Distance

    Hey guys, I'm having an algebra blank, can't figure this out for some reason, I know it simple. aHH!. Ok.. here's the question. I'm trying to isolate d truck, ie, trying to solve for dtruck from the following. Dtruck = Dtruck + 100m 75km/hr...
  14. J

    Changes of State ice to steam problem

    I Got It! Hey, thanks. YOU ARE THE MAN. I can't believe I forgot about those.
  15. J

    Changes of State ice to steam problem

    Ok, I am having some trouble with this problem: How much energy does it take to convert .500 kg ice at -20C to steam at 250 C? Specific heat capacities: ice: 2.1 j/g C, liquid: 4.2 j/g C, steam: 2.0 j/g C. Hvap = 40.7 kj/mol, and Hfus = 6.02 Kj/mol. What I have done so far is use q=mst...
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