If you have glasses the liquid and cloth can be used to clean it. You spray the camera, then use the cloth to wipe it up. If you don't have them the dollar store should have some, or even places like Walmart and Maceys.
Algorithm is part of computer science. You an learn it on Khan academy. (you probably werent looking for this but no one was answering)
The answer is <span>0.693 . </span><span>When a switch is closed, completing an LR series circuit, the time needed for the current to reach one half its maximum value is 0.693
</span>e^(-t/T) = 0.5
<span>-t/T = ln(0.5) = -0.693 </span>
Wow!! that is ALOT of info,I dont think i could help with this one Umders 699 maybe someone else can sorry that i couldn`t help :)