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christine87

Solve V = π r2h for h. Show all work. Help?

  • one year ago
  • one year ago

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  1. godorovg
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    welcome to openstudy

    • one year ago
  2. christine87
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    r = 1.35 h = 12.7

    • one year ago
  3. dan815
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    hi

    • one year ago
  4. dan815
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    why dont you substitute those numbers into the formula and solve it

    • one year ago
  5. tkhunny
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    Divide by \(\pi r^{2}\). \(\left(\pi r^{2}\right)\) is attached to 'h' via multiplication. Detach it via division.

    • one year ago
  6. christine87
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    @dan815 i clearly have done so already, but not coming up with the 'correct' answer according to the rest of the problem i'm inserting it into, hence why I'm seeing if im doing it wrong.

    • one year ago
  7. christine87
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    @tkhunny hi ther, thanks, but i'm not trying to solvefor h, i'm subsituting the numbers i posted above. . . seem to be coming up incorrect according to the book/problem set

    • one year ago
  8. dan815
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    what is the object you are trying to find the integral of?

    • one year ago
  9. dan815
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    volume of* sorry

    • one year ago
  10. dan815
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    is it a cylinder?

    • one year ago
  11. tkhunny
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    ?? "Solve V = π r2h for h" Perhaps we're speaking a different language? One might ask, why are nyou not trying to solve for h? Are you studying Significant Figures"? What answer are you giving that is being rejected?

    • one year ago
  12. bradely
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    step by step answers posted here http://www.mathskey.com/question2answer/2063/solve-v-%CF%80-r-2-h-for-h ask your Algebra1 homework questions athttp://www.mathskey.com/question2answer/algebra-1 and get free math help. all the best

    • one year ago
  13. christine87
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    its a beaker filled with a certain amount of liquid, all a part of a stream of different question s built off this one

    • one year ago
  14. christine87
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    @tkhunny because i HAVE h already, as posted above, im trying to find V

    • one year ago
  15. christine87
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    this is the complete problem : 5. Calculate the volume of the 50mL graduated cylinder using your measurements of diameter and height, using the formula V = ∏ r2h (r=½ diameter). This is your experimental value. Assuming the accepted value of the volume of the graduated cylinder is 50.00 mL, calculate the percent error of your volume calculation, using the following formula: Percent Error = /accepted value - experimental value/x 100 accepted value

    • one year ago
  16. dan815
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    lets compare answers i get for r = 1.35 h = 12.7 pi*2*r*h = 107.725212092

    • one year ago
  17. tkhunny
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    That's okay, but I'm really curious how this is consistent with "Solve V = π r2h for h". Anyway, it appears we ARE studying Significant Figures. Now answer the question. What value are you using that is being rejected?

    • one year ago
  18. dan815
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    that is area tho i think you mean pi * r^2 *h = 72.7145181618

    • one year ago
  19. christine87
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    i'm getting 72.7145. . .but when i plug it into the next step in my problem it doesnt make any sense! im getting a negative percentage error

    • one year ago
  20. dan815
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    it says its pir2h so u shud use the other one 107.725212092

    • one year ago
  21. dan815
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    your question is wrong i think it shud say pir^2*2 not pi*r2h

    • one year ago
  22. tkhunny
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    Well, a negative value isn't possible if you are using the absolute values. Are you using the absolute values? Also, 72.71415 is no good. Use 72.7

    • one year ago
  23. dan815
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    pi*r^2 *h |dw:1362879713114:dw|

    • one year ago
  24. christine87
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    im totally stumped this is the exact problem taken off the homework, nothing seems to fit

    • one year ago
  25. dan815
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    i will help you okay!! if you let me help you

    • one year ago
  26. dan815
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    what is your R and H?

    • one year ago
  27. christine87
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    @dan815 ok thank you. . .im given D = 2.7 and H = 12.7 and r is 1/2 of D

    • one year ago
  28. tkhunny
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    Well, 72.7 mL is a rather horrible approximation for a 50.0 mL beaker. Maybe something else went wrong. Or, maybe we're just testing the %-Errors formula. \(\dfrac{|50.0 - 72.7|}{50.00}\cdot 100\;=\;\dfrac{|- 22.7|}{50.00}\cdot 100\;=\;\)

    • one year ago
  29. dan815
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    ok your V = 1.35^2pi*12.7 = 72.7 (72.7-50/50)*100 = ansswer to 2 decimal places

    • one year ago
  30. dan815
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    45.43%

    • one year ago
  31. dan815
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    u understand?

    • one year ago
  32. christine87
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    its a negative number because its the accepted (50) minus the experiemental number, not the other way around thats why im not understanding

    • one year ago
  33. dan815
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    wuts a negative number?

    • one year ago
  34. dan815
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    is the percentage negative?

    • one year ago
  35. christine87
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    the result is negative

    • one year ago
  36. dan815
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    oh okay then its -45.43%

    • one year ago
  37. christine87
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    how is it possible to have a regative as an answer to this particular question tho?

    • one year ago
  38. dan815
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    its possible if its -'ve then it means ur value was 45.43% more than the actual value if its positive then its 45.43% less than the actual value

    • one year ago
  39. dan815
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    though i think your question should say do the absolute value of the percentage of error

    • one year ago
  40. dan815
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    but if they are defining the percentage of error without absolute value then u can get negative values

    • one year ago
  41. tkhunny
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    You are overlooking the Absolute Values. |50.0 - 72.7| = |72.7 - 50.0| = 22.7 There cannot be a negative value resulting from this operation.

    • one year ago
  42. christine87
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    ooohh ok i have no idea i havent been taught absolute values, just thrown this problem set today

    • one year ago
  43. dan815
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    those 2 lines around the numbers mean take the absolute value so whatever the value they are always take the positive of it

    • one year ago
  44. christine87
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    i was given this: Percent Error = /accepted value - experimental value/x 100 accepted value written exactly as it is, no boxes or lines around etc

    • one year ago
  45. dan815
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    the equation for absolute value is this |dw:1362882330695:dw|

    • one year ago
  46. dan815
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    always gives positive answer

    • one year ago
  47. dan815
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    those / / mean absolute value

    • one year ago
  48. tkhunny
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    What are those slanty lines? Those are supposed to be Absolute Value Symbols. Trust me on this.

    • one year ago
  49. dan815
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    i wish u were asian right now-_-

    • one year ago
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