air resistance

Mythbuster's Exploding Water Heater

In case you never saw it, here is the part of the episode where the Mythbusters explode a water heater.

I started to analyze this previously, but it wasn't complete. Now I will finish what I started.

If you are curious, here are the "answers":
Time of flight = 11.8 seconds.
Max height = 167 meters = 548 feet
Speed on impact (ground) = 34 m/s = 76 mph (compared to 234 mph initially). Read More...

Air Resistance of a falling tennis ball

Suppose I want to have a lab activity with a dropping tennis ball. Do I need to worry about air resistance or can I assume there is none? This is a that was recently asked of me. Below is my answer: Read More...