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  1. E

    Gen Chem - Isomers in a complex ion

    right, I did that. but I'm not sure if the NH3s are fixed or if they can move around etc. I have: NH3 l NH3 - Co - NH3 l NH3 And one F coming out of the screen and...
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    Gen Chem - Isomers in a complex ion

    How can you know if a complex ion has an optical isomer or not? I understand that it's when the mirror image can't be superimposed but am having trouble recognizing it. For example, take [Co(NH3)4F2]+. Does this have an optical isomer or just cis/trans?
  3. E

    Rigid Objects in equilibirum

    =cos10. Thank you very much. Much appreciated.
  4. E

    Rigid Objects in equilibirum

    oh okay. so it's T*Lsin80 since force has to be perpendicular to the lever arm.
  5. E

    Rigid Objects in equilibirum

    It would be 80 yes?
  6. E

    Rigid Objects in equilibirum

    That's what they had in the solution. From the pic I'm getting an angle of 30 between the wire and beam.
  7. E

    Rigid Objects in equilibirum

    Well I'm guessing it's cos(10) but I don't know where that is coming from.
  8. E

    Rigid Objects in equilibirum

    no that's not right. the answer is 2251N. Using your torque for the wire gives an answer of 6898.
  9. E

    Rigid Objects in equilibirum

    Sorry I'm not quite sure what you mean. In the solution it divided the sum of the torques from the crate and the beam by cos(10). Where did they get that from?
  10. E

    Rigid Objects in equilibirum

    A 1200 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1960 N crate hangs from the far end of the beam. Picture: http://edugen.wiley.com/edugen/courses/crs1507/art/qb/qu/c09/ch09p_20.gif Calculate the magnitude of the tension in the...
  11. E

    Calculating Ksp from Delta H

    But you'd need to get delta S first right? EDIT: nvm, got it.
  12. E

    Calculating Ksp from Delta H

    Is it possible to calculate Ksp at a certain temperature if you know Ksp at a different temperature and \Delta H?
  13. E

    Calculating free energy from Ksp

    Okay so I'm confused. In my book it says that ksp for Ca(OH)2 = 6.5E-6 and \Delta G=-898.5 yet when I use the equation \Delta G=-RTln(Ksp) the value I get is 29.59KJ/mol. I used R=8.314 and T=298K. What's up with that? Thanks.
  14. E

    Analysis of simple salt

    What is the color of solid silver phosphate? I don't have a reference book handy with me. Thanks.
  15. E

    Force/vectors problem

    http://imageshack.us" [Broken] http://g.imageshack.us/img10/scan0001px3.jpg/1/" [Broken] http://g.imageshack.us/img27/scan0001xe4.jpg/1/" [Broken] Well I just set the sum of x and y components equal to 0 and got: force 3 = -65N in x and 43.3N in y which gave me a magnitude of 78.1 N and...
  16. E

    Graphing a circle

    oh so just (x-1/2)^2 + (y+1)^2 = 1/4? center would be at (1/2, -1) and radius is sqrt(1/4)=(1/2)?
  17. E

    Graphing a circle

    Consider x^2 + y^2 – x + 2y + 1 = 0. (a) Find the coordinates of the center and the length of the radius. (b) Determine the coordinates of the intercepts. (c) Graph the circle. I'm really lost on this one. I tried plugging in numbers but I seriously doubt that's how I'm supposed to do...
  18. E

    Partial Fractions prob

    nvm (word count)
  19. E

    Partial Fractions prob

    ok this is probably a stupid algebra question but when I move the integral from the right side to the left side then how do I get rid of the a^2/b^2 that's stuck to it?
  20. E

    Partial Fractions prob

    \int e^{ax}cosbx This one is driving me insane. So I used e^ax as u and cosbx dx as dv. And then I did it again using e^ax as u and sinbx as dv which left me with \int e^{ax}cosbx = \frac{1}{b}e^{ax}sinbx + \frac{a}{b^{2}}e^{ax}cosbx - \frac{a^{2}}{b^{2}}\int e^{ax}cosbxdx I have no...
  21. E

    Work and Mass problem

    Oh right. Thanks for your help.
  22. E

    Work and Mass problem

    1. A great conical mound of height h is built. If the workers simply heap up uniform material found at ground level, and if the total weight of the finished mound is M, show that the work they do is .25hM So I related weight density to mass by using volume of a cone and got w =...
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    Washer method problem

    awesome. Thanks again.
  24. E

    Washer method problem

    oh okay. So would y=2 factor into the outer radius too? Meaning r = [2 - (-sqrt(x))]?
  25. E

    Washer method problem

    So it's 4 instead of 2?
  26. E

    Washer method problem

    oh whoops forgot to add a bracket at the end. Thanks for your help.
  27. E

    Washer method problem

    1. Find the volume generated by revolving the area bounded by x=y^{2} and x=4 about the line y=2. Is it \pi\int(4-(2-\sqrt{x})^{2}dx from 0 to 4?
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    Integration help

    lol no worries. Thank you again.
  29. E

    Integration help

    Because I'm only considering the top half of the loop in the integral.
  30. E

    Integration help

    thanks. and I forgot to add that it's from 0 to 3. and you're right - I ended up with 60.9422...
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