For many years Americans have enjoyed the news broadcasts and contemporary information that has been presented by Paul Harvey on the radio. In particular, one segment of his show that reveals very ...

The power produced by a wind turbine is given by a simple formula: P=1/2 x the density of air x the area swept out by the turbines x (the windspeed)^3 Clearly the most important variable is windspeed.

It is tempting to think that some materials are always heavier than other materials. For example, someone might say that metal is heavier than air. But it depends on how much of each material there is ...