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Bullets go ballistic
Learningpost, David Canavan, Published on 15/06/2010
» I'm sure we are all familiar with how dangerous bullets are, especially in light of the recent civil unrest in Bangkok. Weapons and bullets are designed to maim and kill. The mechanics of how deadly projectiles work make for fascinating science.
Sonar
Learningpost, David Canavan, Published on 26/01/2010
» I have a question for you, the answer to which I will give you at the end of this article. You are on a boat looking for a school of fish when your sonar finally finds a school. It emits a "ping" that travels at the speed of sound, which is about 1,500 metres per second in water, and the reflected sound is received half a second later. Using the formula distance equals to speed multiplied by time, work out how deep the fish are, but be careful - there is a catch (pun intended).