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

elica85

find the centroid..drawing, one moment pls

  • one year ago
  • one year ago

  • This Question is Closed
  1. elica85
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1342574765308:dw|

    • one year ago
  2. elica85
    Best Response
    You've already chosen the best response.
    Medals 0

    y bar=(sum y local bar * area)/(sum area) so i thought it should be [(.5*1*5)+2(1*2*1)]/(1*5+2*1*2)... but solution says [(.5*1*5)+2(2*1*2)]/(1*5+2*1*2)

    • one year ago
  3. abstracted
    Best Response
    You've already chosen the best response.
    Medals 1

    What's the horizontal dimension across the top?

    • one year ago
  4. elica85
    Best Response
    You've already chosen the best response.
    Medals 0

    sorry, it's 5. so 3 on the smaller part

    • one year ago
  5. elica85
    Best Response
    You've already chosen the best response.
    Medals 0

    where they have "2", i have as 1 b/c...|dw:1342637555114:dw|

    • one year ago
  6. abstracted
    Best Response
    You've already chosen the best response.
    Medals 1

    Sorry for the wait, had to go do something + internet problems. for the two smaller portions it should be:\[2(1)2+2(1)2\]Which simplifies to\[2[2(1)2]\] You got the distance from the top to the center of the small triangle wrong, it should be 2 not 1. Note that they calculated the centroid from the top of the figure, not the bottom |dw:1342639178273:dw|

    • one year ago
  7. abstracted
    Best Response
    You've already chosen the best response.
    Medals 1

    And when i say triangle... I mean rectangle, ha

    • one year ago
  8. elica85
    Best Response
    You've already chosen the best response.
    Medals 0

    that explains everything since it's a problem of using shear formula so i have to find Q too which i was about to ask next. it all makes sense now but why is the centroid calculated from the top? is that the only way?

    • one year ago
  9. elica85
    Best Response
    You've already chosen the best response.
    Medals 0

    o, i believe you can. i was doing it wrong b/c when i got the y local bar for the top portion, i didn't use 2.5 if i were assuming the bottom to be centroid..klutz

    • one year ago
  10. abstracted
    Best Response
    You've already chosen the best response.
    Medals 1

    As far as the centroid calculation itself, It doesn't matter whether you calculate it from the bottom or top. If you calculated from the bottom you would get a different numerical answer, but it would still point to the centroid. I can't explicitly remember, but there may have instances where it is advantageous to calculate from the bottom or top

    • one year ago
  11. elica85
    Best Response
    You've already chosen the best response.
    Medals 0

    thank you!

    • one year ago
  12. abstracted
    Best Response
    You've already chosen the best response.
    Medals 1

    np!

    • one year 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.