ScienceIQ.com

What Is Radiofrequency Energy (Rf)?

Radiofrequency (RF) energy is another name for radio waves. It is one form of electromagnetic energy that makes up the electromagnetic spectrum. Some of the other forms of energy in the electromagnetic spectrum are gamma rays, x-rays and light. Electromagnetic energy (or electromagnetic radiation) consists of waves of electric and magnetic energy ...

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WhatIsRadiofrequencyEnergy
Astronomy

It's Gonna Hit Us... Or Is It?

Recently, some astronomers were concerned that a newly discovered asteroid might hit Earth in 2017. This was big news because even the impact of a modest-sized asteroid could have a devastating ... Continue reading

MeteorHit
Chemistry

Luminol; Trick-or-Treat or Terrible Feat

What does trick-or-treating and crime scene investigation have in common? Hopefully, they don't have much in common, unless the trick-or-treater is wearing a safety glow stick. Glow sticks contain ... Continue reading

Luminol
Biology

Are Mushrooms Plants?

Mushrooms are classified under the Kingdom Fungi, whereas plants are in the Kingdom Plantae. So, how are mushrooms so different from plants? They both grow in the soil and are not animals, but that is ... Continue reading

AreMushroomsPlants
Engineering

Space Lasers Keep Earth's Air Clean

Space laser technology is coming to our smokestacks and automobiles. Leave it to NASA to take its inventions to another level, helping to keep our air clean and breathable. A recent NASA invention, ... Continue reading

SpaceLasersKeepEarthsAirClean

What Are Cubes And Cube Roots?

CubesAndCubeRootsThe mathematical term 'cube' comes from the three-dimensional shape of the same name. A cube shape has three dimensions of length, width, and height, all equal and at angles of 90 to each other. Put another way, a cube is as high as it is wide as it is long. The mathematical cube of a number comes from the shape of a cube by the number of standard-sized cubes that it contains. For example, a cube that measures 9 centimeters on a side contains 729 smaller cubes that are each 1 centimeter on a side. This can be demonstrated by building the cube using sugar cubes. Start by making a layer of sugar cubes that is 9 sugar cubes long and 9 sugar cubes wide. Then build 8 more layers just like it, one on top of the other, until there are a total of 9 layers. Now count the number of single sugar cubes you used to build the large 9-layer cube. Assuming you didn't eat any of them, you will find that it took 729 sugar cubes.

That number was obtained by finding the volume of the cube. This is done by multiplying the length of the figure by its width and then by its height. That is, by multiplying one number by another number and then by a third number. For a cube, the length, width, and height are all equal, or the same number. Finding the volume of a cube therefore involves multiplying a number by itself and then by itself again. This brings us to the general definition of the cube of a number. The cube of any number is that number multiplied by itself, and then the product multiplied by the original number. For example, 729 is the cube of 9 because you have to multiply 9 by itself (9) to get 81, and then multiply 81 by 9 to get 729. The number that gets multiplied to make the cube value is the root of that cube, or the 'cube root'.

This is the basis of the general definition of a cube root. The cube root of a number is whatever number must be multiplied by itself and then by that product ('cubed') in order to get the original number. For example, 3 is the cube root of 27 because 3 must be multiplied by 3 (itself) to get 9, and then 9 must be multiplied by 3 to get 27. These relationships are true for any number.