# How do you do triple integrals in spherical coordinates?

## How do you do triple integrals in spherical coordinates?

To evaluate a triple integral in spherical coordinates, use the iterated integral ∫θ=βθ=α∫ρ=g2(θ)ρ=g1(θ)∫u2(r,θ)φ=u1(r,θ)f(ρ,θ,φ)ρ2sinφdφdρdθ.

How do you find the limit of spherical coordinates?

Definition of spherical coordinates ρ = distance to origin, ρ ≥ 0 φ = angle to z-axis, 0 ≤ φ ≤ π θ = usual θ = angle of projection to xy-plane with x-axis, 0 ≤ θ ≤ 2π Easy trigonometry gives: z = ρcosφ x = ρsinφcosθ y = ρsinφsinθ.

What is the first Octant in spherical coordinates?

z3√x2 + y2 + z2dV , where D is the region in the first octant which is bounded by x = 0, y = 0, z = √x2 + y2, and z = √1 − (x2 + y2). Express this integral as an iterated integral in both cylindrical and spherical coordinates.

### What is phi in spherical coordinates?

The coordinates used in spherical coordinates are rho, theta, and phi. Rho is the distance from the origin to the point. Theta is the same as the angle used in polar coordinates. Phi is the angle between the z-axis and the line connecting the origin and the point.

What is dV equal to in spherical coordinates?

What is dV is Spherical Coordinates? Consider the following diagram: We can see that the small volume ∆V is approximated by ∆V ≈ ρ2 sinφ∆ρ∆φ∆θ. This brings us to the conclusion about the volume element dV in spherical coordinates: Page 5 5 When computing integrals in spherical coordinates, put dV = ρ2 sinφ dρ dφ dθ.

Why theta varies from 0 to pi in spherical coordinates?

Think about integrating over the sphere to find its volume: If you integrate over phi from 0 to pi, you get half of a circle; if you then integrate theta from 0 to 2pi that half-circle sweeps out the volume of the sphere; however, if you integrated phi from from 0 to 2pi, then that gives you a full circle, which if you …

#### How to calculate triple integrals in spherical coordinates?

Example 1 Evaluate ∭ E 16zdV ∭ E 16 z d V where E E is the upper half of the sphere x2 +y2 +z2 =1 x 2 + y 2 + z 2 = 1 . Example 2 Evaluate ∭ E zxdV ∭ E z x d V where E E is above x2 +y2 +z2 = 4 x 2 + y 2 + z 2 = 4, inside the cone (pointing upward) that makes an angle of π 3 π 3 with the negative z z -axis and has x ≤ 0 x ≤ 0 .

Which is the triple integral for a circular cylinder?

This means that the circular cylinder x2 + y2 = c2 in rectangular coordinates can be represented simply as r = c in cylindrical coordinates. (Refer to Cylindrical and Spherical Coordinates for more review.) Triple integrals can often be more readily evaluated by using cylindrical coordinates instead of rectangular coordinates.

What are the restrictions on the coordinates of an integral?

We also have the following restrictions on the coordinates. For our integrals we are going to restrict E E down to a spherical wedge. This will mean that we are going to take ranges for the variables as follows, Here is a quick sketch of a spherical wedge in which the lower limit for both ρ ρ and φ φ are zero for reference purposes.

## Which is an example of a triple integral?

Now that we have the limits we can evaluate the integral. Example 3 Convert ∫ 3 0 ∫ √9−y2 0 ∫ √18−x2−y2 √x2+y2 x2 +y2 +z2dzdxdy ∫ 0 3 ∫ 0 9 − y 2 ∫ x 2 + y 2 18 − x 2 − y 2 x 2 + y 2 + z 2 d z d x d y into spherical coordinates. Let’s first write down the limits for the variables.