Is that a puzzle released by some government organization?
Is this mathematical explanationogical why rain doesn't kill you:
Raindrops form at about 2 km altitude or higher (the altitude of typical rain clouds, eg: cumulonimbus). If we ignore air resistance, the kinematic relation vf=2gh−−−√ tells you that the velocity when it reaches the ground should be about 200 m/s. While not as fast as bullets, this is still pretty fast and enough to cause harm especially if you are barraged with a large number of them, as in rain.
But the above number for the final velocity is wrong. The air resistance (a.k.a. “drag”) is proportional to the square of the velocity, give by
where ρ is the density of air, A is the projected area and Cd is the drag coefficient which depends on the shape of the falling object (0.47 for sphere). While this force is negligible for small velocities, it becomes larger as the velocity increases and eventually becomes equal to the gravitational force on the body. Since air resistance acts opposite to the direction of the velocity, it in this case cancels the gravitational force of the drop. i.e., the drop is not accelerated any longer once a “terminal velocity” is reached. The terminal velocity is given by,
For a drop of 2 mm radius, this equation gives a terminal velocity of about 9.5 m/s which is much lower than the value without air resistance and not large enough to cause harm.
Raindrops don’t kill people because of air resistance.
It should look like this graph more or less... You can find better ones too in google, but you would always find that number '7' is the most common number people say when asked to splurt it out randomly.
Been 3 months now what are the results????
Thank's for the add! I'll give you 764 free experience points to help you level up!
Reminds me of this video