# Monthly Archives: February 2011

## Projectile Time of Flight/Distance Versus Velocity

Introduction As I mentioned before, I am reading the book “Modern Practical Ballistics” by Pejsa and am finding some interesting material there. I previously duplicated Peja’s derivation for a function describing a G7 standard projectile’s velocity versus range. This post … Continue reading

Posted in Ballistics | 3 Comments

## Drive-By Math

Introduction Occasionally I have an engineer come by my cube and unexpectedly present me with an opportunity to do math. A few years ago one of the engineers stopped by with a VERY common type of electrical engineering problem. He … Continue reading

Posted in Electronics | 2 Comments

## Calculating the Density of a Planet

Introduction I have been reading some interviews with Michel Brown, an astronomer that has a book out called “How I Killed Pluto and Why It Had it Coming.” His interviews are interesting and I encourage people to read or view … Continue reading

## Neat Use of Gravity Measurements

One of my sons is into archeology. Whenever he talks about it, I always find the discussion interesting. We were talking about the pyramids one day and the subject of the various ramp theories came up. He pointed me to … Continue reading

## An Analog Circuit Design Review

Introduction When an electrical engineer asks me what my specialty is, I always respond that I am an analog designer. I love designing analog electronics. Even though I am now in management and am not allowed to design analog electronics … Continue reading

Introduction I was listening to an advertisement where CSX made the claim that they move 1 ton of freight 423 miles for 1 gallon of fuel. This is an interesting measure of efficiency. Let’s see if we can confirm this … Continue reading

Posted in General Science | 5 Comments

## Drinking Math

Introduction As a non-drinker, I have never had much interest in alcohol. That said, alcohol has been a big part of my life. My mother earned her living working in bars, starting as a waitress and eventually managing them. Even … Continue reading

Posted in Health | 7 Comments

## Interesting Old Submarine Photo

A co-worker and I were discussing strange photos we have seen. I mentioned a photo that I saw years ago that showed USS S-5′s tail sticking out of the water. During the 1920s, submarines that submerged occasionally did not come … Continue reading