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elica85

  • 3 years ago

find the centroid..drawing, one moment pls

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  1. elica85
    • 3 years ago
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    |dw:1342574765308:dw|

  2. elica85
    • 3 years ago
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    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)

  3. abstracted
    • 3 years ago
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    What's the horizontal dimension across the top?

  4. elica85
    • 3 years ago
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    sorry, it's 5. so 3 on the smaller part

  5. elica85
    • 3 years ago
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    where they have "2", i have as 1 b/c...|dw:1342637555114:dw|

  6. abstracted
    • 3 years ago
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    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|

  7. abstracted
    • 3 years ago
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    And when i say triangle... I mean rectangle, ha

  8. elica85
    • 3 years ago
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    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?

  9. elica85
    • 3 years ago
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    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

  10. abstracted
    • 3 years ago
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    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

  11. elica85
    • 3 years ago
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    thank you!

  12. abstracted
    • 3 years ago
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    np!

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