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.
(5 mi)^2 * 250 W/m^2 * 20%
(5 mi)^2 * 250 W/m^2 * 20%
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random