Recently NASA revealed a fascinating new material, that it heals itself in a couple of seconds, after being penetrated by a projectile.
It might sound like a science fiction movie, but It isn’t.
How it works? The material is made up of three layers—two thin polymer walls with a liquid inside—which, when exposed to oxygen, will harden.
This means when either of the walls are punctured, the liquid will quickly fill up the gap. In a video released by the research team, the material can be seen actually fixing a hole made by a bullet in about a second.
This can be extremely useful and lifesaving if applied on airplanes or spaceships. If a projectile penetrates a wall of the spacecraft, the material could act as a stopgap safety mechanism that’s built into a wall and quickly plug the hole. Of course we are not talking about a “Gravity” -like situation (sorry Dr. Stone), but still it can be a huge help for the astronauts.
The tests for this material, are simple. They shoot it. With bullets, using a gun. Which made me think about projectiles. And their trajectories.
I searched the fxSolver’s database, and I found the “Time of flight for a projectile following a ballistic trajectory” formula.
A trajectory or flight path is the path that a moving object follows through space as a function of time. Ballistic trajectory of a projectile is the path that a thrown or launched projectile will take under the action of gravity, neglecting all other forces, such as friction from air resistance, without propulsion. The time of flight is the time it takes for the projectile to finish its trajectory and can be calculated by the angle at which the projectile is launched, the velocity at which the projectile is launched and the initial height of the projectile. (t is the time of flight in seconds, u the initial velocity (m/s), θ the angle of elevation in radians, g the standard gravity, and h the initial height of the projectile in meters.)
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