The 5000, A4 and A8 are models from which German automaker?

Which five-word nickname describes Philadelphia? Fifty aluminum flagpoles encircle which Washington, D.C., landmark? Fifty-cent coins issued in 2003 by which country depicted Frodo, Gandalf, Gollum, Sauron and Aragorn? A 50-foot-tall, metal-eating, talking robot befriends a boy in which 1999 animated film? 5,000 photos of which London landmark, home of the Crown Jewels, were taken for the video game "Traitors Gate"? Ames, with the ZIP code 50010, is in which Midwestern state? In old American slang, 50 cents is how many "bits"? Thanks to a Disney TV hero, what fuzzy piece of frontier headwear became a craze among American kids in the mid-1950s?