Chapter 13: Problem 13
Plot the graphs of the given functions on log-log paper. $$y=x^{2 / 3}$$
Short Answer
Expert verified
Plot \(\log(y)\) versus \(\log(x)\) to get a straight line with slope \(\frac{2}{3}\).
Step by step solution
01
Understanding the Log-Log Graph
A log-log graph is a plot where both the x-axis and y-axis are on a logarithmic scale. This type of graph is particularly useful for functions of the form \(y = x^n\), where the graph will appear as a straight line. Here, we are given the function \(y=x^{2/3}\).
02
Determine the Function Form
The given function \(y = x^{2/3}\) can be expressed in the exponential form \(y = x^a\), where \(a = \frac{2}{3}\). This matches the form suitable for a log-log graph, confirming it will plot as a straight line.
03
Transform the Equation for Logarithms
We take the logarithm of both sides: \(\log(y) = \log(x^{2/3})\). Using the property of logarithms \(\log(x^a) = a \cdot \log(x)\), this simplifies to \(\log(y) = \frac{2}{3} \cdot \log(x)\).
04
Plot on Log-Log Paper
On a log-log graph, \(\log(y)\) is plotted against \(\log(x)\). The linear form \(\log(y) = \frac{2}{3} \cdot \log(x)\) indicates that the plot will be a straight line with a slope of \(\frac{2}{3}\).
05
Graph Verification
To verify, select some values of \(x\), compute \(y = x^{2/3}\), and check that the points plotted using their logarithms lie on a straight line on the graph with a slope of \(\frac{2}{3}\). For instance, if \(x = 1\), \(y = 1\); and if \(x = 8\), \(y = 4\). Plotting these points as \((\log(1), \log(1))\) and \((\log(8), \log(4))\) confirms the linearity.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
log-log paper
Log-log paper is a specialized type of graph paper where both the x-axis and y-axis are on a logarithmic scale. This is different from standard linear graph paper where both axes represent values in a normal scale. Using log-log paper can simplify the process of graphing certain mathematical functions, particularly those involving power laws or exponential relationships.
Using a logarithmic scale means that instead of each increment representing a constant addition (as in arithmetic progressions like 1, 2, 3, etc.), each increment on a log scale represents a constant multiplication.
Using a logarithmic scale means that instead of each increment representing a constant addition (as in arithmetic progressions like 1, 2, 3, etc.), each increment on a log scale represents a constant multiplication.
- A key feature of log-log paper is its ability to turn power law relationships, such as those of the form \(y = x^a\), into straight lines.
- This helps to identify the relationship between variables more easily, especially in scientific data.
- In such graphs, the slope of the line indicates the exponent in the equation. For example, a slope of 2/3 would suggest a function \(y = x^{2/3}\).
function plotting
Function plotting refers to the process of creating a graphical representation of a mathematical function. This is traditionally done on a Cartesian coordinate system, where the x-axis serves as the horizontal component and the y-axis as the vertical component. However, sometimes special plotting techniques, such as log-log plotting, are required to better visualize certain functions or data.
When plotting a function like \(y = x^{2/3}\) on a traditional scale, the graph may curve and not clearly show the function's behavior at different scales. By plotting on log-log paper instead, the relationship between variables becomes linear, allowing the analysis of the data in a straightforward manner.
When plotting a function like \(y = x^{2/3}\) on a traditional scale, the graph may curve and not clearly show the function's behavior at different scales. By plotting on log-log paper instead, the relationship between variables becomes linear, allowing the analysis of the data in a straightforward manner.
- Plotting a function involves selecting suitable x-values, calculating corresponding y-values, and marking these (x, y) points on the graph.
- A line through these points can help determine the function's general shape and behavior.
- Using log-log paper for plotting transforms complex exponential and power-law relationships into simple straight lines, making analysis easier.
exponential functions
Exponential functions are mathematical expressions where a constant base is raised to a variable exponent. The general form is \(y = a^x\), where \(a\) is a positive real number, and \(x\) varies. A unique property of exponential functions is their rapid growth or decay, exponentially increasing or decreasing at a constant multiplicative rate.
While not directly exponential due to the form \(y = x^{2/3}\) analyzed here, understanding exponential functions can still be beneficial. This particular form, known as a power-law, showcases continuous growth but not as sharply as traditional exponential functions. In data analysis, both power-law and exponential functions can describe phenomena where change accelerates quickly.
While not directly exponential due to the form \(y = x^{2/3}\) analyzed here, understanding exponential functions can still be beneficial. This particular form, known as a power-law, showcases continuous growth but not as sharply as traditional exponential functions. In data analysis, both power-law and exponential functions can describe phenomena where change accelerates quickly.
- Powers and exponents define the relationship and shape of the graph. In the function \(y = x^{2/3}\), \(2/3\) represents the rate of change.
- In log-log plots, these power-law relationships are easily identified as straight lines, making understanding their impact on data much more intuitive.
- Recognizing exponential behavior in data can be crucial in predicting trends and behaviors in various scientific and economic contexts.