Less significant (but not evidenced in the DNA or fossil evidence) would be multiple independent species making the transition from sea to land
We don't need fossil evidence. There are species of crabs that live on land. Mud-skippers live mainly in the water, but could easily evolve to land based animals.
The only event of that magnitude that we have evidence of created the moon.
So what is to say that there wasn't a technical civilization on earth before the creation of the moon?
No, the 3000km is assuming that you are using the aluminum air battery in addition to the normal lithium battery."
In order for friction to destroy steel, it needs to actually wear it away one particle at a time. Being so much heavier/denser, there are that many more particles to wear away.
Or, you know, heat it up so much that it starts to melt. That's a real possibility for this application. A previous poster suggested rheostatic brakes (basically regenerative braking, where the electricity is dumped into a big resistor instead of being stored for later use). It would add weight and complexity, but if regular brake disks can't dissipate the energy fast enough, then something like that might be necessary.
Just don't spend a single fucking dime of my tax dollars
From your other post:
But if you want to keep on being a typical arrogant American cocksucker, who thinks your shit doesn't stink and everything with a fucking American flag on it must be the GREATEST GODDAMNED THING IN THE FUCKING WORLD, then be my guest. Just don't be surprised when everyone who isn't American spits on you when they find out where you're from.
I guess that makes you a "typical arrogant American cocksucker"?