Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

lovekblue Group Title

Need help in integral area involve 3d objects

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    • 2 years ago
    1 Attachment
  2. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    what's your question?

    • 2 years ago
  3. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    ah I see those are multiple choices...

    • 2 years ago
  4. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    did you get the 'sketch the region' one?

    • 2 years ago
  5. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    basically just asking you to pick which of those areas is bounded by y=5, x=4 and the function...

    • 2 years ago
  6. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    you there?

    • 2 years ago
  7. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    the first choice is bounded by y=10, x=4 and the function... the second choice is bounded by y=10, x=0, x=4 and the function...

    • 2 years ago
  8. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    yes i am here..

    • 2 years ago
  9. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I know the answer for the first picture already, not sure about the 2nd one @Algebraic!

    • 2 years ago
  10. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    For the first picture, i think it is the last one for the 2nd picture, i am thinking either 1st or 4th one , what do u think ?

    • 2 years ago
  11. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    naw, the last picture is bounded by x=0 y=0 and the function...

    • 2 years ago
  12. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    (and x=4)

    • 2 years ago
  13. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    so for the first picture, u also think is the last one?

    • 2 years ago
  14. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    for my function, x is not 0 u mean?

    • 2 years ago
  15. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    just trace around each of those red regions and see what functions or lines your tracing...

    • 2 years ago
  16. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    what lines do you trace for the last choice?

    • 2 years ago
  17. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1352777609189:dw|

    • 2 years ago
  18. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    yea, that's what i have too. dont really know how i got that..but yeah.. Do you possibly know how to volume the volume of this?

    • 2 years ago
  19. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1352777630991:dw|

    • 2 years ago
  20. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1352777716676:dw|

    • 2 years ago
  21. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    dont u need to integrate the area function to volume , and then something to do with the height..?

    • 2 years ago
  22. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    so... is that the region described in your problem statement??

    • 2 years ago
  23. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

    • 2 years ago
  24. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    really? your problem statement makes no mention of x=0 or y=0 ...

    • 2 years ago
  25. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    it does mention y=5 however...

    • 2 years ago
  26. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    well, but it says rotate about y= 10, and y= 5

    • 2 years ago
  27. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    naw..

    • 2 years ago
  28. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    then u can kinda know there is a hole in between

    • 2 years ago
  29. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    umm..wait..so which picture do you think it is for the first set of picture? i thought we have the same answer

    • 2 years ago
  30. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    the region is bounded by x=4 y=5 and y=5e^-x

    • 2 years ago
  31. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    like I said trace the boundary of the regions you have been given to find which one works with that description..

    • 2 years ago
  32. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    there's no point in guessing here... even though this is multiple guess

    • 2 years ago
  33. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    i still think is the last one..

    • 2 years ago
  34. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    that's why i want to know which one u think it is

    • 2 years ago
  35. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    why is it the last one..

    • 2 years ago
  36. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    are you talking about the first part or the second part?

    • 2 years ago
  37. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    first part ..

    • 2 years ago
  38. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    because if you do the first part correctly, the answer to the second part should be obvious

    • 2 years ago
  39. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    ok..

    • 2 years ago
  40. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    so do you agree that it is either the bottom left or bottom right picture is correct due to the fact that given y=5

    • 2 years ago
  41. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    then why are you saying it's the last region?

    • 2 years ago
  42. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    why is it not the last picture ..lol |dw:1352778179844:dw|

    • 2 years ago
  43. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    did you see the sketches where I traced the bounding functions??

    • 2 years ago
  44. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    what are they??

    • 2 years ago
  45. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    the curve is y= 5e^-x , y =5 , x=4

    • 2 years ago
  46. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    what functions bound the region in the last picture?

    • 2 years ago
  47. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    hint: I already did it for you.

    • 2 years ago
  48. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    x=0, y=0..which i dont really get u ..o_o

    • 2 years ago
  49. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    trace the boundary

    • 2 years ago
  50. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1352778560923:dw|

    • 2 years ago
  51. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    what's that portion?

    • 2 years ago
  52. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    say "y=0"

    • 2 years ago
  53. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1352778627593:dw|

    • 2 years ago
  54. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    what's that portion?

    • 2 years ago
  55. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    are you trying to say that radius doesnt bound to x=0?

    • 2 years ago
  56. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    which it does indeed make sense when i look in the 2nd part

    • 2 years ago
  57. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    I'd focus on the first part, if I were you..

    • 2 years ago
  58. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    picking which region is bounded by y=5, x=4 and y= 5e^-x

    • 2 years ago
  59. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    i'm not sure what u mean by bounded..do you mean by starting from there?

    • 2 years ago
  60. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    trace the boundary of each region

    • 2 years ago
  61. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    like I did... for the last region pictured in your choices...

    • 2 years ago
  62. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    if i do what u did, then the answer will be the bottom left

    • 2 years ago
  63. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    yes

    • 2 years ago
  64. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    but my question with that picture is.. don't u need to do 5- 5e^-t in order to get tht area?

    • 2 years ago
  65. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    not necessarily..

    • 2 years ago
  66. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    you'll be using washers probably, since you haven't learned about shells yet (I assume)...

    • 2 years ago
  67. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    so the inner radius is 5 and the outer radius is 10-5e^-x

    • 2 years ago
  68. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    yea i didnt yet.. i didnt even learn these stuff much when my assignment is due 2 days after..

    • 2 years ago
  69. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    ya, i do get that part

    • 2 years ago
  70. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1352779152955:dw|

    • 2 years ago
  71. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    is that region not what the last picture look like?

    • 2 years ago
  72. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    for the second part... yep.

    • 2 years ago
  73. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    can i ask what does "region " mean..

    • 2 years ago
  74. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    the red areas in the first part.

    • 2 years ago
  75. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    yea..what does that red area mean

    • 2 years ago
  76. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    is it like the path of rotation or something?

    • 2 years ago
  77. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    no.

    • 2 years ago
  78. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    it's the thing you're sweeping around the specified axis in order to generate a solid

    • 2 years ago
  79. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1352779636199:dw|

    • 2 years ago
  80. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    take that region as an example... it's a rectangle...

    • 2 years ago
  81. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    rotate about the x axis and you sweep out a cylinder..

    • 2 years ago
  82. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    so it's kinda you are sweeping that region, and that sweeping motion generate the solid figure?

    • 2 years ago
  83. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1352779702320:dw|

    • 2 years ago
  84. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    yes, exactly.

    • 2 years ago
  85. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    okay thank you so so much!!!!!!

    • 2 years ago
  86. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Do you still have time to guide me on filding the volume?

    • 2 years ago
  87. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    the second multiple choice question? or a new question?

    • 2 years ago
  88. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    it's the same question. but it asks to find the volume

    • 2 years ago
  89. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    cuz finding the volume is actually the first part..but the graphing part seems easier so i skipped to that first ..

    • 2 years ago
  90. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    sure... we are using the washers in the sketch (and in the last choice to the second question)

    • 2 years ago
  91. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    inner radius is 5, outer radius is 10 - 5e^-x

    • 2 years ago
  92. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    area of a washer will be pi( (10 - 5e^-x)^2 - 5^2 )

    • 2 years ago
  93. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    yea..that's all i have too.. not sure how to integrate that..

    • 2 years ago
  94. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \[\pi \int\limits_{ }^{} (10-5e^{-x})^2 - 5^2 dx\]

    • 2 years ago
  95. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \[\pi \int\limits_{0}^{4} 75 -100e^{-x} +25e^{-2x} dx\]

    • 2 years ago
  96. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    that should be pretty easy to integrate...

    • 2 years ago
  97. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    oh ok..i didnt combine them.. ok thanks, i will try that out :)

    • 2 years ago
  98. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    @Algebraic! umm.. how can i leave it as exact numbers..?

    • 2 years ago
  99. lovekblue Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    i got pi ((300+10 e^-4 - 25/2 e^-8)- (10-25/2))

    • 2 years ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.