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Chapter 13: Problem 36

Sketch the level surface \(f(x, y, z)=c\). \(f(x, y, z)=x^{2}+y^{2}-z^{2} ; c=0\)

Short Answer

Expert verified
The surface \(x^2 + y^2 = z^2\) is a double cone centered at the origin in 3D space.

Step by step solution

01

Understand the Level Surface Equation

The given level surface is defined by the equation \(f(x, y, z) = x^2 + y^2 - z^2 = 0\). This can be rewritten as \(x^2 + y^2 = z^2\). The goal is to visualize this surface in 3D space.
02

Identify the Surface Type

The equation \(x^2 + y^2 = z^2\) is a standard form of a double cone centered at the origin. In Cartesian coordinates, this equation describes two circular cones that open along the z-axis, one upwards and one downwards.
03

Sketch in the Coordinate System

To sketch this surface, draw the z-axis, and then draw circular cross-sections centered on the z-axis. These cross-sections represent the radii increasing linearly as you move away from the origin along the z-axis. The surface will form two cones, one pointing up and one pointing down.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Double Cone
A double cone consists of two conical shapes meeting at a single point, known as the apex. In the given equation, the double cone is formed by the level surface equation \(x^2 + y^2 = z^2\).
This describes a surface with circular symmetry around the z-axis.
With the apex located at the origin (0,0,0), one cone extends upwards, and the other downwards, both along the z-axis. These cones have a unique feature:
  • The radius of the circular cross-sections (parallel to the x-y plane) increases linearly with height (z).
  • As \(z\) becomes positive or negative, \(x^2 + y^2\) must match \(z^2\), creating a symmetrical double-conical shape.
These characteristics make the double cone a crucial shape in the visualization of quadratic surfaces, offering insights into higher-dimensional geometrical shapes.
3D Graphing
3D graphing refers to plotting objects in three dimensions (x, y, and z). This method allows us to visualize complex shapes and surfaces, such as the double cone, in a more tangible format.
When plotting in 3D, focus is placed on:
  • Identifying key features like symmetry and axis alignment. For a double cone, this means acknowledging its symmetrical nature across the z-axis.
  • Drawing cross-sections to understand the structure. Circular cross-sections (\(x^2 + y^2 = z^2\)) can be drawn parallel to the x-y plane.
  • Using intersection lines between segments of the shape and axes to maintain accuracy in our sketch.
Graphing these characteristics allows us to piece together the overall shape effectively, bridging the gap between algebraic equations and visual intuition.
Cartesian Coordinates
Cartesian coordinates are a foundational system in mathematics for defining positions in the plane and space using numerical values. Points are given coordinates based on their distance from two or more axes (x, y, and z in three dimensions).
For the equation \(x^2 + y^2 = z^2\), considered under Cartesian coordinates, the surface is encoded in a straightforward yet robust manner. Here's how:
  • The x and y coordinates determine the cross-sectional radius in the plane at any point along the z-axis (\(z^2\)).
  • At each height \(z\), the x and y values adjust to ensure that they collectively meet the constraint \(x^2 + y^2 = z^2\).
  • This setup allows us to easily plot points and understand their spatial location in the 3D environment.
Using Cartesian coordinates simplifies the process of visualizing and calculating complex surfaces like the double cone, facilitating an easier understanding of 3D shapes and their underlying algebraic forms.

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Most popular questions from this chapter

Find the minimum value of \(f\) subject to the given constraint. In each case assume that the minimum value exists. $$ f(x, y, z)=3 z-x-2 y ; z=x^{2}+4 y^{2} $$

Find the extreme values of \(f\) in the region described by the given inequalities. In each case assume that the extreme values exist. $$ f(x, y)=x y ; 2 x^{2}+y^{2} \leq 4 $$

A function \(f\) of two variables is homogeneous of degree \(\boldsymbol{n}\) if for any real number \(t\) we have $$ f(t x, t y)=t^{n} f(x, y) $$ Show that in this case $$ x f_{x}(x, y)+y f_{y}(x, y)=n f(x, y) $$ (Hint: Differentiate both sides of \((8)\) with respect to \(t\), and then set \(t=1 .\) )

A road is perpendicular to a train track. Suppose a car approaches the intersection of the road and the track at 20 miles per hour, while a train approaches at 100 miles per hour. At what rate is the distance between the car and the train changing when the car is \(0.5\) miles from the intersection and the train is \(1.2\) miles from the intersection?

Find the minimum value of \(f\) subject to the given constraint. In each case assume that the minimum value exists. $$ f(x, y, z)=x^{2}+2 y^{2}+z^{2} ; x+y+z=4 $$
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