i need one thousand usa visitors . i can pay 5 cents per click . niche does not matter any low competition keyword will work . but traffic should be from usa . so can i get 1000 visits from adwords at rate of 5 cents a click?
Yep, 5 cents is the minimum bid for click thrus from there search engine, just a penny on the content network. You'll need to do some kind of targeting so the ads fit your site though, otherwise G won't accept them.
you would have to build an extensive keyword list with alot of longtail keywords included in order to get this amount traffic for $50.00. unless you are in no hurry to get the traffic.
You're way behind your league if you honestly believe that just because the niche has low competition, that you will be able to receive 5 cent clicks. You're CPC is 80% controlled by your Quality Score. Competition is a factor, but not as much as your QS. If you have QS 3; then you could even be paying $3.00/click for your low competition niche.
if you need 1000 USA visitors, you don't need adwords. Go to second tier ppc like 7 search or google "buy traffic" first. If you want to sell to 1000 people, adwords is for you, but the budget will be much bigger