# Todd Helmenstine

Todd Helmenstine is the physicist/mathematician who creates most of the images and PDF files found on sciencenotes.org. Nearly all of the graphics are created in Adobe Illustrator, Fireworks and Photoshop. Todd also writes many of the example problems and general news articles found on the site.

## Stamped Metal Periodic Table Wallpaper

Metal Periodic Table of Steel! This metal periodic table wallpaper has the elements stamped into a shiny, flat sheet of steel. Each element is represented by its atomic number, symbol, name, and atomic mass. The table itself includes the four new elements completing the period 7 elements: nihonium, moscovium, tennessine, […]

## Inelastic Collision Example Problem – Physics Homework HelpRecently updated !

A collision is considered an inelastic collision when kinetic energy is lost during the collision. This inelastic collision example problem will show how to find the final velocity of a system and the amount of energy lost from the collision. Inelastic Collision Example Problem Question: A 3000 kg truck travelling […]

## Color Neon Lights Periodic Table Wallpaper

This colorful neon lights periodic table wallpaper shines brightly with a subtle glow. This table contains each element’s number, symbol, and name. Each element group shines with a different colored neon tube glow. As you move across the body of the tables, the colors follow the classic ROY G BIV […]

## Neon Colored Glowing Tube Periodic Table Wallpapers

These colored glowing tube periodic table wallpapers are a colorful means to adorn your desktop with the elements. The individual element cells are meant to look like neon glow tubes in a sort of 80s ‘future’ font. Each wallpaper is suitable for 4K monitors with a resolution of 3840 x […]

## Elastic Collision Example Problem – Physics Example Problems

Elastic collisions are collisions between objects where both momentum and kinetic energy are conserved. This elastic collision example problem will show how to find the final velocities of two bodies after an elastic collision. This illustration shows a generic elastic collision between two masses A and B. The variables involved […]