Jules Verne's crazy idea
1. In 1865 Jules Verne proposed sending men to the Moon by firing a space capsule from a 220 m long canon with final speed of 11 km/s.
(a) What would have been the unrealistically large acceleration experienced by the space travelers during their launch?
(b) Compare your answer with the free-fall acceleration. Why is this “unreasonably large?”
(c) How long would the cannon have to be in order to launch the explorers to 11 km/s with an acceleration that people can survive?