Misc: how many rings make up the olympic symbol?

Questions

Disney's 1979 attempt at a sci-fi flick, with Ernest Borgnine?

John Singleton hit it big in 1991 with this ghetto tale (spelling...)?

John Travolta is a sound FX man who discovers a murder?

JOhn Wayne leads Filipino guerillas to victory in the South Pacific (1945)?

Kathleen Turner's first film was this Kasdan steamer?