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The shell method goes as follows: Consider a volume in three dimensions obtained by rotating a cross-section in the xy-plane around the y-axis. Suppose the cross-section is defined by the graph of the positive function f(x) on the interval [a, b]. Then the formula for the volume will be: ()
Two common methods for finding the volume of a solid of revolution are the disc method and the shell method of integration.To apply these methods, it is easiest to draw the graph in question; identify the area that is to be revolved about the axis of revolution; determine the volume of either a disc-shaped slice of the solid, with thickness δx, or a cylindrical shell of width δx; and then ...
In mathematics (particularly multivariable calculus), a volume integral (∭) is an integral over a 3-dimensional domain; that is, it is a special case of multiple integrals. Volume integrals are especially important in physics for many applications, for example, to calculate flux densities, or to calculate mass from a corresponding density ...
In mathematics, a volume element provides a means for integrating a function with respect to volume in various coordinate systems such as spherical coordinates and cylindrical coordinates. Thus a volume element is an expression of the form = (,,) where the are the coordinates, so that the volume of any set can be computed by = (,,).
The 'south'-direction x-axis is depicted but the 'north'-direction x-axis is not. (As in physics, ρ is often used instead of r to avoid confusion with the value r in cylindrical and 2D polar coordinates.) According to the conventions of geographical coordinate systems, positions are measured by latitude, longitude, and height (altitude).
Disc integration, also known in integral calculus as the disc method, is a method for calculating the volume of a solid of revolution of a solid-state material when integrating along an axis "parallel" to the axis of revolution. This method models the resulting three-dimensional shape as a stack of an infinite number of discs of varying radius ...
A general -volume of the -parallelotope subtended by these basis vectors is the grade multivector . Even more generally, we may consider a new set of vectors { x i 1 e i 1 , … , x i k e i k } {\displaystyle \{x^{i_{1}}e_{i_{1}},\ldots ,x^{i_{k}}e_{i_{k}}\}} proportional to the k {\displaystyle k} basis vectors, where each of the { x i j ...
Adjustments need to be made in the calculation of line, surface and volume integrals. For simplicity, the following restricts to three dimensions and orthogonal curvilinear coordinates. However, the same arguments apply for n-dimensional spaces. When the coordinate system is not orthogonal, there are some additional terms in the expressions.