A tweet directed me to an interesting article on world population. The author, Jonathan Good, asks the percentage of people who have ever lived that are alive today and then estimates the answer. The ...

Scale of the Line Rider First, we assume that the line rider is on Earth and for low speeds will have a free-falling acceleration of 9.8 m/s 2. Next, an arbitrary distance is selected. In this case ...

One of the most basic things students do in a physics lab is to collect data and use that to build a model. Most of these models come in the form of a mathematical function. But here is the problem.