Solution:  Graph first to verify the points of intersection. Area Under a Curve by Integration; 3. The disc method is used when the slice that was drawn is perpendicular to the axis of revolution; i.e. “Outside” function is $$y=x$$, and “inside” function is $$x=1$$. This is because we are using the line $$y=x$$, so for both integrals, we are going from 1 to 4. Note that the base of the rectangle is $$1-.25{{x}^{2}}$$, the height of the rectangle is $$2\left( {1-.25{{x}^{2}}} \right)$$, and area is $$\text{base}\cdot \text{height}$$: \displaystyle \begin{align}\text{Volume}&=\int\limits_{{-2}}^{2}{{\left[ {\left( {1-.25{{x}^{2}}} \right)\cdot 2\left( {1-.25{{x}^{2}}} \right)} \right]dx}}\\&=2\int\limits_{{-2}}^{2}{{{{{\left( {1-.25{{x}^{2}}} \right)}}^{2}}}}\,dx\end{align}. (We can also get the intersection by setting the equations equal to each other:). $$\displaystyle \text{Volume}=\int\limits_{0}^{\pi }{{{{{\left[ {\sqrt{{\sin \left( x \right)}}-0} \right]}}^{2}}\,dx}}=\int\limits_{0}^{\pi }{{\sin \left( x \right)}}\,dx$$. 3. cancel. Applications of Integration This chapter explores deeper applications of integration, especially integral computation of geomet-ric quantities. First, to get $$y$$ in terms of $$x$$, we solve for the inverse of $$y=2\sqrt{x}$$ to get $$\displaystyle x={{\left( {\frac{y}{2}} \right)}^{2}}=\frac{{{{y}^{2}}}}{4}$$ (think of the whole graph being tilted sideways, and switching the $$x$$ and $$y$$ axes). Thus: $$\displaystyle \text{Volume}=\frac{{\sqrt{3}}}{4}\int\limits_{{-3}}^{3}{{{{{\left( {2\sqrt{{9-{{x}^{2}}}}} \right)}}^{2}}}}dx=\sqrt{3}\int\limits_{{-3}}^{3}{{\left( {9-{{x}^{2}}} \right)}}\,dx$$. The application of integrals to the computation of areas in the plane can be extended to the computation of certain volumes in space, namely those of solids of revolution. If we have the functions in terms of $$x$$, we need to use Inverse Functions to get them in terms of $$y$$. Find the Volume, To find the volume of the solid, first define the area of each slice then integrate across the range. Chapter 6 : Applications of Integrals. From counting through calculus, making math make sense! You can also go to the Mathway site here, where you can register, or just use the software for free without the detailed solutions. The “inside” part of the washer is the line $$y=5-4=1$$. Level up on the above skills and collect up to 200 Mastery points Start quiz. \begin{align}&\pi \int\limits_{{-4}}^{4}{{\left( {16-{{x}^{2}}} \right)dx}}\\&\,=\pi \left[ {16x-\frac{1}{3}{{x}^{3}}} \right]_{{-4}}^{4}\\\,&=\pi \left( {\left[ {16\left( 4 \right)-\frac{1}{3}{{{\left( 4 \right)}}^{3}}} \right]-\left[ {16\left( {-4} \right)-\frac{1}{3}{{{\left( {-4} \right)}}^{3}}} \right]} \right)\\&=\frac{{256}}{3}\pi \end{align}. The volume of the solid formed by rotating the area between the curves of $f(x)$ and $g(x)$ and the lines $x=a$ and $x=b$ about the $x$-axis is given by: $\displaystyle{V = \pi \int_a^b \left | f^2(x) - g^2(x) \right | \,dx}$. Two common methods for finding the volume of a solid of revolution are the disc method and the shell method of integration. Computing the area between curves 2. Finding volume of a solid of revolution using a shell method. Since we can easily compute the volume of a rectangular prism (that is, a "box''), we will use some boxes to approximate the volume of the pyramid, as shown in figure 9.3.1 : on the left is a cross-sectional view, on the right is a 3D view of part of the pyramid with some of the boxes used to …
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