Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
evaluate(F=2k(sqrt((l/2)^2+d^2)-l/2)d/sqrt((l/2)^2+d^2)) for (F=200,k=600,l=3)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random