sound velocity

The space agency's budget also requires a grant for a new type of aircraft that appears to exist only in sketches and in the imagination of NASA engineers: the X-Plane plane.

Firefighters are equipped with emergency alarms with quite large sound intensity. However, their colleagues participating in fire fighting often do not hear this alarm. So what

Austrian sports athlete Felix Baumgartner has just announced a breakdown plan

Considering that two-tier aircraft is still in use today, the designs of these designers include the second wing with the effect of preventing drag created by obstacles when