JavaScript Math.cbrt() Examples [In-Depth Tutorial]


Written By - Olorunfemi Akinlua

In mathematics, a cube root is a number that, when multiplied by itself three times, gives a given number. For example, the cube root of 8 is 2, because 2 x 2 x 2 = 8. The cube root is the inverse operation of cubing a number.

The Math.cbrt() function is a built-in JavaScript method that allows you to find the cube root of a number. It takes a single argument, which is the number whose cube root you want to find, and returns the cube root of that number.

In this article, we will explore the Math.cbrt() function in more detail and provide some examples of its use.

 

Square and Cube Roots Mathematics

Before diving into Math.cbrt(), it's worth discussing square and cube roots in mathematics. The square root of a number is a value that, when multiplied by itself, gives the original number. For example, the square root of 9 is 3, because 3 x 3 = 9. Similarly, the cube root of a number is a value that, when multiplied by itself three times, gives the original number. For example, the cube root of 343 is 7, because 7 x 7 x 7 = 343.

Both square and cube roots are important in many mathematical and scientific calculations. For example, in geometry, the Pythagorean theorem relies on finding the square root of numbers. In physics, the laws of motion and other formulas often require the use of square and cube roots.

 

Using the Math.cbrt() method in JavaScript

Now let's take a look at some examples of how to use the Math.cbrt() function in JavaScript.

 

Example 1: Find Cube Root of a Value

Suppose we have a number x and we want to find its cube root. We can use the Math.cbrt() function to do this as follows:

const x = 27;
const cubeRoot = Math.cbrt(x);
console.log(cubeRoot);

Output

3

In this example, we pass the number 27 as the argument to the Math.cbrt() function and store the result in a variable called cubeRoot. The console.log() statement outputs the value of cubeRoot, which is 3.

 

Example 2: Find Cube Root for a Negative Value

The Math.cbrt() function also works for negative numbers. For example, let's find the cube root of -125:

const y = -125;
const cubeRootY = Math.cbrt(y);
console.log(cubeRootY);

Output

-5

In this example, we pass the number -125 as the argument to the Math.cbrt() function and store the result in a variable called cubeRootY. The console.log() statement outputs the value of cubeRootY, which is -5.

 

Example 3: Calculate the Volume of a Cube

Another use case for the Math.cbrt() function is to calculate the volume of a cube. Suppose we have a cube with a side length of a. The volume of the cube is given by the formula a^3, which is the same as a * a * a. We can use the Math.cbrt() function to find the side length of the cube, given its volume:

const volume = 64;
const sideLength = Math.cbrt(volume);
console.log(sideLength);

Output

4

In this example, we pass the volume of the cube, which is 64, to the Math.cbrt() function and store the result in a variable called sideLength. The console.log() statement outputs the value of sideLength, which is 4. This means that the side length of the cube is 4 units.

 

Example 4: Calculating the Velocity of a Falling Object

Suppose you have a falling object with a mass of m and a gravitational acceleration of g. You can use the Math.cbrt() function to calculate the velocity of the object after a certain time t using the formula:

v = Math.cbrt(2 * g * m * t)

where g is the gravitational acceleration, m is the mass of the object, and t is the time.

Here's an example code snippet that calculates the velocity of a falling object after 5 seconds, assuming the object has a mass of 10 kg and the gravitational acceleration is 9.81 m/s^2:

const g = 9.81;
const m = 10;
const t = 5;

const velocity = Math.cbrt(2 * g * m * t);
console.log(
    `The velocity of the falling object after ${t} seconds is ${velocity.toFixed(
        2
    )} m/s`
);

Output

The velocity of the falling object after 5 seconds is 9.94 m/s

 

Example 5: Volumetric calculations

Math.cbrt() can be used to calculate the volume of a cube or rectangular prism. For example, if you know the volume of a cube and want to find the length of one side, you can use Math.cbrt() to calculate it.

// Given the volume of a cube is 27, calculate the length of one side
let volume = 27;
let sideLength = Math.cbrt(volume);
console.log(sideLength); // Outputs 3

 

Example 6: Calculate 3D graphics

Math.cbrt() can be used to calculate the size of a cube that contains a given number of smaller cubes. For example, if you have 125 smaller cubes arranged in a 5x5x5 cube, you can use Math.cbrt() to calculate the size of the larger cube.

// Given there are 125 smaller cubes arranged in a 5x5x5 cube, calculate the size of the larger cube
let numSmallerCubes = 125;
let cubeSize = Math.cbrt(numSmallerCubes);
console.log(cubeSize); // Outputs 5

 

Example 7: Scientific calculations

Math.cbrt() can be used in scientific calculations that involve cube roots. For example, if you are calculating the concentration of a solution and need to take the cube root of a value, you can use Math.cbrt().

// Given a concentration value of 27.56, calculate the cube root of the value
let concentration = 27.56;
let cubeRootConcentration = Math.cbrt(concentration);
console.log(cubeRootConcentration); // Outputs 3.091015600079863

 

Summary

The Math.cbrt() function is a useful JavaScript method that allows you to find the cube root of a number. It can be used in a variety of mathematical and scientific calculations, such as finding the side length of a cube given its volume or calculating the velocity of a falling object. In this article, we explored some basic examples of using the Math.cbrt() function to find the cube root of a number, and also demonstrated how it can be used in more advanced calculations.

 

References

Math.cbrt() - JavaScript | MDN (mozilla.org)

 

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