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Rotational Volume Calculator Online

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The Rotational Volume Calculator is a powerful tool designed to compute the volume of an object created by rotating a two-dimensional area around an axis. This calculation is pivotal in fields where precise volume measurements are necessary, such as in designing physical components or in academic research.

Formula of Rotational Volume Calculator

Disk Method

When a region is revolved around the x-axis, the volume V of the solid formed can be calculated using the disk method:

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V = pi * integral from a to b of [f(x)]^2 dx


f(x) is the function being revolved
[a, b] is the interval of integration along the x-axis

Washer Method

When the region between two curves is revolved around the x-axis, the volume V can be calculated using the washer method:

V = pi * integral from a to b of ([R(x)]^2 – [r(x)]^2) dx


R(x) is the outer radius function
r(x) is the inner radius function
[a, b] is the interval of integration along the x-axis

Useful Table for Common Calculations

To assist with quick calculations, here’s a table featuring common scenarios and their corresponding rotational volume calculations:

ShapeAxis of RotationFormula
CylinderX-axisV = pi * r^2 * h
ConeX-axisV = (1/3) * pi * r^2 * h

These values can be directly use or adjust base on specific needs without performing detail calculations each time.

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Example of Rotational Volume Calculator

Consider calculating the volume of a solid obtained by rotating the region under the curve f(x) = x^2 from x = 0 to x = 2 around the x-axis using the disk method.


V = pi * integral from 0 to 2 of x^4 dx = pi * [x^5 / 5 from 0 to 2] = 32pi/5

Most Common FAQs

Q1: What if the calculator gives an unexpected result?

A1: Check the input values for accuracy, particularly the functions and limits of integration. Ensure that all expressions are enter correctly.

Q3: Where can I learn more about rotational volume calculations?

A3: Consider academic textbooks on calculus or engineering, online courses, and educational videos that delve deeper into integral calculus and rotational volumes.

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