UnScramble this Word: i p a u c o s t?

Questions

the submarine was invented in 1620 by cornelius drebbel. name his country of origin.?

from which broadway show do we get the songs 'the girl that i marry' and 'anything you can do'?

name the album on which natalie cole sang 'duets' with her deceased father.?

which emperor said wellington wasnt a good general?

what was the name of the b-29 that dropped the bomb on hiroshima?