From Quora, The first book in college (as a physics major) I used for Quantum Mechanics was the book by Griffiths. Introduction to Quantum Mechanics (2nd Edition) David J. Griffiths: …

## Tutoring Physics Sound Waves

Some notes from tutoring today, His class is studying sound waves right now. We looked at questions related to a lab. One question had to do with the accuracy of finding the speed of sound using …

## “My 8 year old grandson asked, “Could all the water on earth put out the sun?”

Saw this question on Quora and thought it was interesting. The sun is hot enough to have nuclear fusion. But let's pretend that it was just a fire like we would have burning wood on Earth and …

## How to do a phasor calculation with radians using a principle of Eulers Formula

"How has this been calculated? I try to convert the 7.11 to radians and sum it up, then converting it back to degrees. However I do not get 1.61." -Quora question My response: The numbers are …

## What is the Moment of Inertia?

We looked at rotational moment and the moment of inertial as well as some connected ideas. The Greek letter omega stands for angular velocity, alpha stands for angular acceleration. Capital L …

## “A 2 kg ball is dropped from 25 m up. How fast is it going 5 meter above the ground, no air friction?”

One way to approach the problem is to use conservation of energy. Part of the gravitational potential energy is converted to kinetic energy. Given the directions, we can assume conversation of …