Hot Education Posts
How To: Tie off a suspension ring for rope bondage
If you're planning on doing some bondage knots, you better learn how to do it right. This video shows you how to properly tie off a titanium suspension ring for use in your bondage activities. This video is clear and straight forward, using a large piece of rope, making it easy to see exactly how it's done. Remember to be careful with your S&M knots, especially if you're suspending someone's weight.
How To: Find the volume of a cone quickly
For people who are interested in math or who need to know how to find the volume of a cone for any reason, whether it be homework or architecture, this video will show you how to do so. The formula for finding the volume of a cone is (1/3) pi x radius^2 x height. You can find the radius of your cone by finding half the length across the center of the circle which is the cone's base. After plugging in all the values into this equation, you will be able to find the volume of any cone when given...
How To: Turn Milk into Strong Natural Glue with Baking Soda and Vinegar
You can do all kinds of unexpected things with milk, like make your own pore strips and invisible ink, or even get rid of red wine stains with it. But did you know that you can also use it to make your own glue?
How To: Subtract a mixed number from a proper fraction in basic math
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this free math tutorial, you'll learn how to subtract a mixed number from a fraction in basic arithmetic.
How To: Find percent by mass & percent composition
In chemistry you come across problems which ask you to find the percent by mass and percent composition of each element in a chemical compound. To do this the first step is to compute the molar mass. Use the periodic table to look up the mass of individual atoms and multiply it by the number of atoms to find the mass of that element. Now add up all the masses to arrive at the molar mass of the compound. Now to find the percent composition of an element divide the total mass of each element by...
How To: Use and find x & y-intercepts in algebra
A straight line can be represented in the form of a liner equation containing two variables x and y. When the equation is graphed on a pair of coordinate axes, the line passes cut through the axes in two points. The point where the line cuts the x-axes is called as its x coordinate and the point where the line cuts the y-axes is called as its y coordinate. In this way a line has x-intercept and y-intercept. The x-intercept of a line lies on x axes and is in the form (a,0). Similarly the y-int...
How To: Make fake blood from iron, chloride, and potassium
In order to make fake blood, for special effects or for Halloween, you will need the following: Potassium Thiocyanate (KSCN), Iron (III) Chloride (FeCL3), which is also known as ferric chloride or may substitute Iron Nitrate (Ferric Nitrate). You will also need water or dihydrogen monoxide.
How To: Find the area of a circle when you know the diameter
In this video, it is shown how to calculate the area of a circle where the diameter is given. The formula for calculating the area of a circle is pi multiplied by square of radius. Radius is actually half of the diameter. In this video, the diameter is given as 10.6 meters. Hence, the radius will be half of 10.6 which is equal to 5.3 meters. Now, to find the area we shall multiply pi with the square of 5.3. Square of 5.3 is 28.09. If we multiply 28.09 with pi we shall get the area of the circ...
How To: Use a mean and scatter plot for Statistics
Wondering how to use a mean and scatter plot for statistics? Just follow the few simple steps as below.
How To: Multiply fractions with mixed numbers
This video teaches the viewer how to multiply fractions with mixed numbers. You would first need to multiply the denominator by the whole number, and then add the product to the numerator. This number is your new numerator and the new denominator is the same as before. For example, 2 1/5 = 11/5. Now you have an equation with fractions and no whole numbers. You may now proceed to multiply straight across. Multiply the numerators together to create a new numerator and do the same for the denomi...
How To: Find a slope of a straight line with: Ax + By + C = 0
In this video the instructor shows how to find the slope of an equation which is in the form Ax + By + C = 0. He says that the formula to find the slope of a line in the above form is slope m = -A/B, where A and B are the numeric constants of the variables x and y in the given equation. He goes on and further shows how to do this with a couple of examples. He shows how to reduce any equation into the general form and how to apply the slope formula then. This video shows how to find the slope ...
How To: Find the area of a triangle when given 2 sides & angle
This video shows you how to easily find the area of a triangle when you know the length of 2 sides and the angle between them. The first thing you have to do is mark the sides of the triangle by a, b, c, where a is the side between A and B, b is the side between B and C and c is the side between C and A. If you know 2 of these 3 sides an you know the angle between them you can find the area of the triangle very simple: Area= (a x b x sin c)/2, where a, b are the two sides and c is the angle b...
How To: Sugar & Sulfuric Acid — A Cool Chemical Reaction
Sulfuric acid is mixed with sugar, which is attacked by the acid. The final products are carbon, water vapor, and sulfur dioxide gas.
How To: Find the Radius of a Circle from Arc Length
The video provides two example problems for finding the radius of a circle given the arc length. Problem one finds the radius given radians, and the second problem uses degrees.
How To: Make a Paperclip Float on Water
This quick video demonstrates the classic experiment of making a paperclip, or multiple paperclips, float on water.
How To: Make Glow Powder Out of Household Chemicals
Glowing substances have always held a powerful appeal to people, and making new ones can be a lucrative business. If you need some glow powder for a project of yours, watch this video to learn how to make DIY glow-in-the-dark powder out of normal household chemicals.
How To: Take an acid and base to make salt
In this tutorial we learn how to take an acid and base to make salt. To start, you will first need to take an acid of your choice, this can be something like vinegar. After this, you will combine the acid with a base and then wait for it to react. Once it starts to react, gases will release from them and you will end up with some salt! Be sure to put a cap on the container while the reaction is happening. This will allow the reactions to come together and the gases to react. Have fun and do t...
How To: Determine if you have a function
In this tutorial, we learn how to determine if you have a function. You will start off with two functions and their points. The 'x' values make up the domain of the function and the 'y' values make up the range. The input values are the domain and the output are the range. If you're checking to see if you have a function, you will need one 'y' for every 'x'. This means that each value has another one that goes with it. Each of the points need to have one partner with them, no more and no less...
How To: Find the surface area of a cube
In this video, we learn how to find the surface area of a cube. Finding the surface area of a cube is something everyone will have to do in math. The easy formula to figure out this is: surface area= side x side x 6. Your first step to figuring out the problem is to find the length of a side. Once you have found this, you will substitute and evaluate the numbers in the equation. After this, write the units in for the problem. You will then come up with the answer of the equation with the unit...
How To: Use the distance formula for two points
In this tutorial, we learn how to use the distance formula for two points. The distance formula is D= the square root of (X2-X1) squared, plus (Y2 minus Y1) squared. It may look confusing, but it's just a derivation of a theorem. First, find the two points that you have and graph them. If you want to know the distance between them, you cannot just count squares if it's a diagonal line. If you remember geometry, you can draw a right triangle over the line to figure out the distance. After this...
News: BAM! Sugar Is Not as Sweet as You May Think
You may think of sugar as purely a sweet ingredient meant for baking, but it can actually be a deadly explosive, according to PopSci's Gray Matter:
How To: Find the 100th term in a sequence
Need to find the nth term in a given arithmetic sequence? See how it's done with this free video math lesson. Need help finding the From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's seri...
How To: Find the inverse of a function in algebra
Need a little help figuring out how to find the inverse of a function in algebra? Watch this free video lesson. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this free math tutorial, you'll learn how to calculate the inverse of a given algebraic fun...
How To: Find the vertical asymptotes of a rational function
Need help figuring out how to find the vertical and horizontal asymptotes of a rational function? Learn how with this free video lesson. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test).
How To: Antidifferentiate functions with radicals in calculus
This video demonstrates how to do anti-differentiate functions with radicals in calculus. To simply problems, try to substitute. For example, in the problem, the integral of x times the square root of x plus 2 dx. You can substitute w for everything underneath the radical: i.e. x + 2. When you simplify, it becomes: the integral of x times the square root of w dw. Now, you need to get rid of the x, which you can do with a substitution: w – 2 = x. Now, plug in the values and simplify it.
How To: Find the area of a circle with a given radius
This video describes how to find the area of a circle given a radius of 4cm. The video begins by describing the formulas needed to find the area of the circle. The narrator cautions the viewer on a few common mistakes that people frequently make while using these formulas, such as not properly squaring the radius of the circle. The solution to the formula for a 4cm radius is 50.24 cm^2. The video then demonstrates that this value makes sense by overlaying a grid onto the circle and visually s...
How To: Find the equation of an ellipse given a graph
Notes College Algebra teaches you how to find the equation of an ellipse given a graph. You first want to find out the center of the ellipse, which in the video is (2, -3). The major axis is parallel to the X axis. The equation is (x - h) squared/a squared plus (y - k) squared/a squared equals 1. A is the distance from the center to either of the vertices, which is 5 over here. B is the distance from the center to the top or bottom of the ellipse, which is 3. You then use these values to find...
How To: Derive the basic area of a triangle
In this video tutorial, viewers learn how to solve the area of a triangle. The formula for the area of a triangle is A = ½ x b x h or bh/2. The base of the triangle is always at the bottom; it is the side that the triangle sits on. The height is the length between the base and the highest point of the triangle. Multiply the base and height of a triangle; then divide by two or multiply by half. The measurement unit of the answer should be squared. This video will benefit those viewers who need...
How To: The Trick to Stabbing a Balloon Without Popping It
A balloon's worst fear is a sharp object, so usually when you puncture a balloon, it pops in your face. Not with this science trick! To puncture a fully blown up latex balloon without popping it, you'll need a pointed metal or wooden skewer and some plain old dish soap. That's it.
How To: Weigh something you can't see with this cool science trick
With this cool science trick by Mr. G, learn how to weigh something you can't even see! Using a stick, some string and two balloons, you can see in your very own home that air, invisible as it is, has weight. This is a good example to show atmospheric pressure.
How To: Make chlorine gas with pool chlorine and hydrochloric acid
Chlorine gas is a very useful oxidant, which was first introduced as a toxic weapon by the German Army. Even today, it's still used as a weapon, most recently in the Iraq War by insurgents. But chlorine gas has more useful (and less lethal) applications, and if you want to learn how to make some at home, NurdRage has the answers.
How To: Graph inequalities on a number line
In this video, we learn how to graph inequalities on a number line. Inequalities have a greater than or less than sign instead of an equal signs. Remember that these are no different than figuring out how to graph normal equations. First, you will need to remove the single numbers from each side of the equation. Continue to do math on the equation until you figure out what 'x' is. From here, draw the numbers on your graph and then find the number that 'x' is greater to or less than. Use an op...
How To: Build parachutes with household materials
In this video, we learn how to build parachutes with household materials. You will need: a long string, Mylar, mesh, plastic, scissors, tape, and a weight. To get started, you will first cut your plastic or mesh into a circle or octagon shape. Then, take your string and cut it into several pieces. Then, tape the strings onto your material all around. After this, tie your weight to the strings so it's fully secured. Now, go to somewhere high and throw down your item! The parachute will help ke...
News: It's Hot, It's Creamy. It's Three Course Gum as a Meal
Remember Willy Wonka's magical gum? Wonka promised the flavors of tomato soup, roast beef, baked potato, blueberry pie and ice cream. As the avid gum lover Violet Beauregarde tested it out, she exclaimed: “It’s hot and creamy, I can actually feel? it running down my throat!” Um, yum... I think. Good news. Wonka's three course chewing gum is finally a reality-in-the-works. Scientists at the Institute of Food Research (IFR) have been developing recent advances in nanotechnology, which could pot...
How To: Determine if a point lies on a line in standard form
In this video, we learn how to determine if a point lies on a line in standard form. In order to do this, you will need to substitute the X and Y value with the ordered pair that is given. The X value is the first number and the Y value is the second number. Re-write your equation, substituting in the numbers to the appropriate spots. Now, simplify the equation by doing multiplication with the negatives and positives (if given). When you get through the equation, you will end up with the solu...
How To: Evaluate a line integral along a straight line segment
This video tutorial is in the Education category which will show you how to evaluate a line integral along a straight line segment using the definition of the line integral. This video evaluates a line integral along a straight line segment using a parametric representation of the curve (using a vector representation of the line segment) and then integrating. A vector representation of a line that starts at r0 and ends at r1 is r(t) = (1-t)r0 + tr1 where t is greater than equal to 0 and lesse...
How To: Find the interior & exterior angles of a triangle
In this tutorial, we learn how to find the interior and exterior angles of a triangle. I triangle has three angles and their measurement when added together will equal 180. For example, if one angle is 80 and another is 30, then start off saying the equation equals 180. Write in 80+30+X in front of the equals sign, then subtract the combined like terms from the 180. After this, you will have found the value of x, which will also be the measurement of the last angle. Make sure to write out the...
News: Jane Goodall Was a Babe (and One of History's Greatest Conservationists)
National Geographic recently published a retrospective of the lovely Jane Goodall, one of the world's most accomplished conservationists. The feature includes every image of Goodall to ever appear in the magazine for the past fifty years.
How To: Solve word problems involving domain and range
See how to find the domain and range of a function implied by a word problem with this free video math lesson. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutor...
How To: Build a cool soda bottle water rocket
Real rockets require top ingenuity from physics and engineering experts, but you can construct a smaller replica that costs almost nothing can can be made from materials you already have at home or can find at a hardware store.