We have a structure that is sloped at 20 Degrees to the horizontal and weights 160N. We then have a force (wind) which is acting along the horizontal plane which has been calculated to be of about 8000N. 

The problem we are having is that we are unable to find what amount of ballast that needs to be added at the bottom of the structure to stop the structure from being blown away. The structure will not be bolted to the ground. At the moment we do not have an exact amount for the coefficient of friction, but the structure will be placed on a flat concrete surface.

We have tried to find a solution by breaking the forces along the vertical and horizontal components, but we where unsure if we where heading in the right direction. Below is an image which describes the setting:



Could someone please advise us as to which mathematical model we should use?

Thanks in advance

Yes, you can.  And you do not even need to leave the Earth to do it.  

You are always viewing things in the past, just as you are always hearing things in the past.  If you see someone do something, who is 30 meters away, you are seeing what happened $(30\;\mathrm{m})/(3\times10^8\;\mathrm{m}/\mathrm{s}) = 0.1\;\mu\mathrm{s}$
in the past.  

If you had a mirror on the moon (about 238K miles away), you could see about 2.5 seconds into earth's past.  If that mirror was on Pluto, you could see about 13.4 hours into Earth's past.

If you are relying on hearing, you hear an event at 30 m away about 0.1 s after it occurs.  That is why runners often watch the starting pistol at an event, because they can see a more recent picture of the past than they can hear.

To more directly answer the intent of your question:  Yes, if you could magically be transported 27 lightyears away, or had a mirror strategically placed 13.5 lightyears away, you could see yourself being born.
