Dressing yield (58% of liveweight) would be around 464 lbs, and cutability (49% of carcass weight) would be 227 lbs. So you would likely get around 230 lbs of meat from an 800 lb cow.
Define "healthy." Healthy in terms of being "nice and fat" or just healthy as in no health issues? How much meat you get off of that cow depends on breed/type and body condition score.
No, a cow will not eat meat, although there will be some curious cow that would probably try it, cows do not and will not eat meat.
http://ask.metafilter.com/27259/How-much-meat-is-there-on-a-cow
Meat from a cow, obviously.
as much as the meat out of it as you can sell.
A cow could be sold to a slaughter house for a few hundred dollars. The meat of a cow is around 6 dollars a pound and only 175 pounds on the average cow can be used.
It depends on how much this "average" cow weighs and whether you're referring to the amount of ready-to-eat meat on a cow or the hot-carcass weight of that "average" cow. It also depends on whether you're referring to a "cow" or a cow, its type and breed.
Red meat is cow meat AKA beef, it's not bad for you unless you eat too much of it.
"Cow meat" -- aka Beef -- gets eaten by humans.
http://ask.metafilter.com/27259/How-much-meat-is-there-on-a-cow
They're one and the same, there's no difference between "cattle meat" and "cow meat." Cow and/or cattle meat is called Beef, regardless what class or type of bovine it came from.
The cow does not have cow chops cut from its meat because of the size of the steaks that can be taken from the cow. A chop would infer a smaller size. That is why they are called steaks on a cow and not chops.
Carnivores in the food chain would eat cows. This is because carnivores eat meat and cows have meat in them.