Find a parametric representation for the surface. The part of the sphere x2 + y2 + z2 = 16 that lies between the planes z = āˆ’2 and z = 2. (Enter your answer as a comma-separated list of equations. Let x, y, and z be in terms of Īø and/or Ļ•.)

Respuesta :

The standard choice would be the usual representation in spherical coordinates. Let

[tex]x=4\cos\theta\sin\varphi[/tex]

[tex]y=4\sin\theta\sin\varphi[/tex]

[tex]z=4\cos\varphi[/tex]

We get the part of the sphere between the planes [tex]|z|=2[/tex] with [tex]0\le\theta\le2\pi[/tex] and [tex]\dfrac\pi3\le\varphi\le\dfrac{2\pi}3[/tex].

To Ā answer this question, we should make use of spherical coordinates.

Solution is:

S = ( Ā 4ƗcosĪø ƗsinΦ , 4 ƗsinĪøĆ— sinΦ, 4 Ɨ cosΦ)

0 ≤ Īø ≤ 2Ć—Ļ€ Ā  Ā  ;  π/2  ≤ Ф ≤ (3/2)Ć—Ļ€

In Analitic Geometry we have different way of determine, and identify Ā the position of objects, we have rectangular coordinates, cylindrical coordinates and spherical coordinates. The use of each of these system depends on de geometry of the problem.

In this particular case and according to the problem statement we should use spherical coordinates

x = ρ×cosĪø ƗsinΦ Ā  Ā  Ā  Ā  Ā  y = ρ ƗsinĪøĆ— sinΦ Ā  Ā  Ā  Ā  z = ρ× cosΦ

In our particular case

ρ = 4 Ā  then Ā  x = 4ƗcosĪø ƗsinΦ Ā  Ā  y = 4 ƗsinĪøĆ— sinΦ Ā  z = 4 Ɨ cosΦ

0 ≤ Īø ≤ 2Ć—Ļ€ Ā  Ā  ; Ā  Ļ€/2  ≤ Ф ≤ ( 3/2)Ć—Ļ€

So the solution in terms of θ and/or  Φ

S = ( Ā 4ƗcosĪø ƗsinΦ , 4 ƗsinĪøĆ— sinΦ, 4 Ɨ cosΦ)

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