Question

6. Let R be the tetrahedron in the first octant bounded by the coordinate planes and the plane passing through (1, 0, 0), (0, 1, 0), and (0, 0, 2) with equation 2x + 2y + z = 2, as shown below. Using rectangular coordinates, set up the triple integral to find the volume of R in each of the two following variable orders, but DO NOT EVALUATE.

(a) triple integral 1 dxdydz

(b) triple integral of 1 dzdydx

Answer #1

The tetrahedron is the first octant bounded by the coordinate
planes and the plane passing through (1,0,0), (0,2,0), and
(0,0,3).
I need to calculate the volume of this region, how should this
be done?

a. Let S be the solid region first octant bounded by the
coordinate planes and the planes x=3, y=3, and z=4 (including
points on the surface of the region). Sketch, or describe the shape
of the solid region E consisting of all points that are at most 1
unit of distance from some point in S. Also, find the volume of
E.
b. Write an equation that describes the set of all points that
are equidistant from the origin and...

Let D be the solid in the first octant bounded by the planes
z=0,y=0, and y=x and the cylinder 4x2+z2=4.
Write the triple integral in all 6 ways.

Calculate the volume bounded by the plane x + 2y + 3z = 6 by
coordinate planes with a triple integral.

Let E be the solid that lies in the first octant, inside the
sphere x2 + y2 + z2 = 10. Express the volume of E as a triple
integral in cylindrical coordinates (r, θ, z), and also as a triple
integral in spherical coordinates (ρ, θ, φ). You do not need to
evaluate either integral; just set them up.

Find 6 different iterated triple integrals for the volume of the
tetrahedron cut from the first octant (when x > 0, y > 0, and
z > 0) by the plane 6x + 2y + 3z = 6. Dont evaluate the
integrals.

Use a triple integral to find the volume of the given solid.
The tetrahedron enclosed by the coordinate planes and the
plane
11x + y + z = 2

a) Sketch the solid in the first octant bounded by:
z = x^2 + y^2 and x^2 + y^2 = 1,
b) Given
the volume density which is proportional to the distance from the
xz-plane, set up integrals
for finding the
mass of the solid using cylindrical
coordinates, and spherical coordinates.
c) Evaluate one of these to find the mass.

B is the solid occupying the region of the space in the first
octant and bounded by the paraboloid z = x2 + y2- 1 and the planes
z = 0, z = 1, x = 0 and y = 0. The density of B is proportional to
the distance at the plane of (x, y).
Determine the coordinates of the mass centre of solid B.

Let D be the region enclosed by the cone z =x2 + y2 between the
planes z = 1 and z = 2.
(a) Sketch the region D.
(b) Set up a triple integral in spherical coordinates to ﬁnd the
volume of D.
(c) Evaluate the integral from part (b)

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