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How should I solve this triple integral?


Finding the Limits of the Triple Integral (Spherical Coordinates)How to setup/evaluate a triple integral to show an interesting result in physics?Triple Integrals in Spherical Coordinates where (z-2)^2Triple integral in spherical / cylindrical coordinates - where's the error? Exercise checktriple integral over spherical region and of a shifted sphere integrandTriple Integral in spherical coordinatesCalculating triple integral over a region GTrying to evaluate this triple integral?Triple Integrals in Spherical Coordinates, problem with boundariesComputing Triple Integral Using Spherical Coordinates













3












$begingroup$


Hi everybody I have a triple integral I can't solve:




$$iiint sqrt x^2+y^2+z^2 ,dx ,dy ,dz $$




Which the region is between $z=sqrt x^2+y^2$ and $z=4$ .
The question says after using the spherical coordinates the answer is:




$$aLargeint _0^pi/4 frac(sin phi)dphicos^4phi $$




So I've used the spherical coordinates $0<r<4$ and $ 0<theta<2pi$ and $0<phi<fracpi2$. The things I don't get is first why is $phi$ varying between 0 and $fracpi4$ instead of $fracpi2$? And secondly where did that $cos^4phi$ came from?



By the way the question asks for the value of $a$.










share|cite|improve this question









New contributor




khoshrang is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$











  • $begingroup$
    EDIT: ok now i understand the ϕ<π/4 it's because if we put x=0 in z=√ x^2+y^2we will get z=+y and z = -y which explains the ϕ bounds
    $endgroup$
    – khoshrang
    2 days ago















3












$begingroup$


Hi everybody I have a triple integral I can't solve:




$$iiint sqrt x^2+y^2+z^2 ,dx ,dy ,dz $$




Which the region is between $z=sqrt x^2+y^2$ and $z=4$ .
The question says after using the spherical coordinates the answer is:




$$aLargeint _0^pi/4 frac(sin phi)dphicos^4phi $$




So I've used the spherical coordinates $0<r<4$ and $ 0<theta<2pi$ and $0<phi<fracpi2$. The things I don't get is first why is $phi$ varying between 0 and $fracpi4$ instead of $fracpi2$? And secondly where did that $cos^4phi$ came from?



By the way the question asks for the value of $a$.










share|cite|improve this question









New contributor




khoshrang is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$











  • $begingroup$
    EDIT: ok now i understand the ϕ<π/4 it's because if we put x=0 in z=√ x^2+y^2we will get z=+y and z = -y which explains the ϕ bounds
    $endgroup$
    – khoshrang
    2 days ago













3












3








3





$begingroup$


Hi everybody I have a triple integral I can't solve:




$$iiint sqrt x^2+y^2+z^2 ,dx ,dy ,dz $$




Which the region is between $z=sqrt x^2+y^2$ and $z=4$ .
The question says after using the spherical coordinates the answer is:




$$aLargeint _0^pi/4 frac(sin phi)dphicos^4phi $$




So I've used the spherical coordinates $0<r<4$ and $ 0<theta<2pi$ and $0<phi<fracpi2$. The things I don't get is first why is $phi$ varying between 0 and $fracpi4$ instead of $fracpi2$? And secondly where did that $cos^4phi$ came from?



By the way the question asks for the value of $a$.










share|cite|improve this question









New contributor




khoshrang is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$




Hi everybody I have a triple integral I can't solve:




$$iiint sqrt x^2+y^2+z^2 ,dx ,dy ,dz $$




Which the region is between $z=sqrt x^2+y^2$ and $z=4$ .
The question says after using the spherical coordinates the answer is:




$$aLargeint _0^pi/4 frac(sin phi)dphicos^4phi $$




So I've used the spherical coordinates $0<r<4$ and $ 0<theta<2pi$ and $0<phi<fracpi2$. The things I don't get is first why is $phi$ varying between 0 and $fracpi4$ instead of $fracpi2$? And secondly where did that $cos^4phi$ came from?



By the way the question asks for the value of $a$.







integration spherical-coordinates multiple-integral






share|cite|improve this question









New contributor




khoshrang is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|cite|improve this question









New contributor




khoshrang is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|cite|improve this question




share|cite|improve this question








edited 2 days ago









Max

629317




629317






New contributor




khoshrang is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked 2 days ago









khoshrangkhoshrang

596




596




New contributor




khoshrang is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





khoshrang is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






khoshrang is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











  • $begingroup$
    EDIT: ok now i understand the ϕ<π/4 it's because if we put x=0 in z=√ x^2+y^2we will get z=+y and z = -y which explains the ϕ bounds
    $endgroup$
    – khoshrang
    2 days ago
















  • $begingroup$
    EDIT: ok now i understand the ϕ<π/4 it's because if we put x=0 in z=√ x^2+y^2we will get z=+y and z = -y which explains the ϕ bounds
    $endgroup$
    – khoshrang
    2 days ago















$begingroup$
EDIT: ok now i understand the ϕ<π/4 it's because if we put x=0 in z=√ x^2+y^2we will get z=+y and z = -y which explains the ϕ bounds
$endgroup$
– khoshrang
2 days ago




$begingroup$
EDIT: ok now i understand the ϕ<π/4 it's because if we put x=0 in z=√ x^2+y^2we will get z=+y and z = -y which explains the ϕ bounds
$endgroup$
– khoshrang
2 days ago










1 Answer
1






active

oldest

votes


















4












$begingroup$

The plane $z=4$ has equation $r=4sec phi.$ So your limits for $r$ are $0leq r leq 4sec phi.$






share|cite|improve this answer









$endgroup$








  • 1




    $begingroup$
    wow i can't believe how much time i wasted for this only because i was trying with the cylinder "r" concept . thank you
    $endgroup$
    – khoshrang
    2 days ago










Your Answer





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1 Answer
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active

oldest

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1 Answer
1






active

oldest

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active

oldest

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active

oldest

votes









4












$begingroup$

The plane $z=4$ has equation $r=4sec phi.$ So your limits for $r$ are $0leq r leq 4sec phi.$






share|cite|improve this answer









$endgroup$








  • 1




    $begingroup$
    wow i can't believe how much time i wasted for this only because i was trying with the cylinder "r" concept . thank you
    $endgroup$
    – khoshrang
    2 days ago















4












$begingroup$

The plane $z=4$ has equation $r=4sec phi.$ So your limits for $r$ are $0leq r leq 4sec phi.$






share|cite|improve this answer









$endgroup$








  • 1




    $begingroup$
    wow i can't believe how much time i wasted for this only because i was trying with the cylinder "r" concept . thank you
    $endgroup$
    – khoshrang
    2 days ago













4












4








4





$begingroup$

The plane $z=4$ has equation $r=4sec phi.$ So your limits for $r$ are $0leq r leq 4sec phi.$






share|cite|improve this answer









$endgroup$



The plane $z=4$ has equation $r=4sec phi.$ So your limits for $r$ are $0leq r leq 4sec phi.$







share|cite|improve this answer












share|cite|improve this answer



share|cite|improve this answer










answered 2 days ago









B. GoddardB. Goddard

19.6k21442




19.6k21442







  • 1




    $begingroup$
    wow i can't believe how much time i wasted for this only because i was trying with the cylinder "r" concept . thank you
    $endgroup$
    – khoshrang
    2 days ago












  • 1




    $begingroup$
    wow i can't believe how much time i wasted for this only because i was trying with the cylinder "r" concept . thank you
    $endgroup$
    – khoshrang
    2 days ago







1




1




$begingroup$
wow i can't believe how much time i wasted for this only because i was trying with the cylinder "r" concept . thank you
$endgroup$
– khoshrang
2 days ago




$begingroup$
wow i can't believe how much time i wasted for this only because i was trying with the cylinder "r" concept . thank you
$endgroup$
– khoshrang
2 days ago










khoshrang is a new contributor. Be nice, and check out our Code of Conduct.









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