Summersnow8
  • Summersnow8
V = π r^2 h Where: r = 61.0 m, h = 125.3 m Find: V = ? -- 1464740.243 *Be sure to follow the rules for adding and multiplying measurements.
Physics
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SOLVED
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katieb
  • katieb
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zepdrix
  • zepdrix
Ooo the rules.. oh boy.. I'm trying to remember those..
zepdrix
  • zepdrix
When you multiply, you end up with the lower amount of decimals.... I think? Bah I better look it up
Summersnow8
  • Summersnow8
@zepdrix Round the result to the same number of significant digits as the measurement with the least number of significant digits but i can't seem to get the right answer

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Summersnow8
  • Summersnow8
yeah that = 1464740.243
zepdrix
  • zepdrix
Well, let's make sure we're `rounding between each step`, not just multiplying it all together :O
zepdrix
  • zepdrix
@phi just take over please -_- my brain todays
phi
  • phi
It sounds like you should round 1464740.243 to 1460000.
Summersnow8
  • Summersnow8
okay, ill try that
zepdrix
  • zepdrix
Ya try that :) But I think that if we're following the rules each step of the way, we end up with a slightly larger answer. \[\Large\rm V= \color{green}{3.14} (\color{orangered}{61.0m})^2(\color{royalblue}{125.3m})\]Squaring, then rounding to 3 digits gives us,\[\Large\rm V= \color{green}{3.14} (3720m^2)(\color{royalblue}{125.3m})\]Multiplying the pi, then rounding again gives,\[\Large\rm V= 11700m^2(\color{royalblue}{125.3m})\]Then doing our last multiplication step, before rounding should give us,\[\Large\rm V= 1466010m^3\]So I think we actually want to round UP in this case, ya?
zepdrix
  • zepdrix
1470000 :d

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