Re: "How to use a barometer to measure the height of a building."
4) (with stopwatch) drop barometer - Newton is your friend.
Famously, James Clerk Maxwell opted for 4 in an oral exam at Edinburgh University. He never did graduate from there. Then got the chair of physics at Marischal College in Aberdeen where he was made redundant when it merged with Aberdeen University.
He and Scottish universities never got on.