Double Integral 232.q1.5a Calculation

In summary, the given integral represents the area under the function $xy\sqrt{x^2+y^2}$ over the rectangular region $R=[0,2]\times[-1,1]$.
  • #1
karush
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$\tiny{232.q1.5,a}$
\begin{align*}\displaystyle
I_a&=\iint\limits_{R} xy\sqrt{x^2+y^2} \, dA \\
R&=[0,2]\times[-1,1]
\end{align*}

would this be

$$\int_{-1}^{1} \int_{0}^{2}xy\sqrt{x^2+y^2} \,dx \, \, dy $$
 
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  • #2


Yes, that is correct. The given integral represents the double integral of the function $xy\sqrt{x^2+y^2}$ over the region $R=[0,2]\times[-1,1]$. This notation is often used in mathematics to represent a double integral, with the inner integral representing the integration with respect to the first variable and the outer integral representing the integration with respect to the second variable. It is important to specify the limits of integration for each variable to accurately evaluate the integral.
 

FAQ: Double Integral 232.q1.5a Calculation

1. What is a double integral?

A double integral is a type of mathematical integration that involves calculating the area under a two-dimensional surface. It is represented by the symbol ∬ and is used to find the volume, mass, or other quantities in a three-dimensional space.

2. How do you calculate a double integral?

To calculate a double integral, you first need to set up the limits of integration, which define the boundaries of the surface. Then, you can use a variety of methods such as the rectangular, polar, or cylindrical coordinates to evaluate the integral. You can also use software or online calculators to compute the double integral.

3. What is the purpose of a double integral?

The purpose of a double integral is to find the area under a two-dimensional surface in a three-dimensional space. It is used in many fields of science, such as physics, engineering, and economics, to calculate quantities like volume, mass, and probability.

4. What is the difference between a single and a double integral?

A single integral calculates the area under a curve in a one-dimensional space, while a double integral calculates the area under a surface in a two-dimensional space. In other words, a double integral is an extension of a single integral into two dimensions.

5. What are some applications of double integrals?

Double integrals have many applications in mathematics and science. They are used to calculate the volume of a solid, the center of mass of an object, the probability of an event, and the work done by a force. They are also used in fields such as physics, engineering, and economics to solve real-world problems.

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