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[CALCULUS III—DOUBLE INTEGRALS] Evaluate by converting to polar coordinates. (figure inside)
Calculus1
schrodinger
  • schrodinger
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\[\int_0^3\int_0^{\sqrt{9-x^2}}(x^2+y^2)^{3/2}\ dydx\]
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notes — http://tutorial.math.lamar.edu/Classes/CalcIII/DIPolarCoords.aspx
zepdrix
  • zepdrix
Let's start by drawing the region.\[\large 0 \le y \le \sqrt{9-x^2}\]Here are the boundaries on y, it appears to be the upper half of a circle, with radius 3.|dw:1363217680487:dw|

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zepdrix
  • zepdrix
How bout the boundaries on x?\[\large 0 \le x \le 3\]This is telling us that our region is only the first quadrant.
zepdrix
  • zepdrix
|dw:1363217804038:dw|This is how our boundaries would change in polar.
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Hey I appreciate your help. Keep posting guidelines, I am currently finishing up at work but when I get home I will be looking at this again and begin solving.
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If you do decide to post a lot, leave the answer and final evaluations to me ;)
zepdrix
  • zepdrix
Changing to polar, we let \(\large x=r\cos\theta\) and \(\large y=r\sin\theta\) and simplify our integral down. An important thing to remember, is that when we change the `differentials`, a factor of \(\large r\) will pop out as well.\[\large dx\;dy \qquad \rightarrow \qquad r\;dr\;d\theta\]
zepdrix
  • zepdrix
Haha XD I prolly won't post the final answer, just some steps :D They frown on that stuff here.. If I don't let you do some of the work, heh
zepdrix
  • zepdrix
So I think this is how our integral would change. \[\large \int\limits_{\theta=0}^{\pi/2}\quad \int\limits_{r=0}^{3} \left((r \cos \theta)^2+(r \sin \theta)^2 \right)^{3/2}\left(r \;dr\;d \theta\right)\]
zepdrix
  • zepdrix
Lemme know if you have trouble solving that. Don't forget your important trig identity, \(\large \cos^2x+\sin^2x=1\)

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