only substance that can withstand the forces involved. 700 miles an hour. in withstand the forces involved. 700 miles an hour. withstand the forces involved. 700 miles an hour. in order to sin u- 700 miles an hour. in order to spin up to 700 miles an hour. in order to spin up to nearly 700 miles an hour. in order to spin up to nearly 1000 - 700 miles an hour. in order to spin up to nearly 1000 miles l 700 miles an hour. in order to l spin up to nearly 1000 miles an hour today this entire chamber needs to be a vacuum and that is why we can hardly hear anything. if this were full of air, we would get a sonic boom on every single revolution. you can heave on every single revolution. you can heave a on every single revolution. you can heave a little on every single revolution. you can heave a little bit. - on every single revolution. ym. can heave a little bit. can you hear it? a little bit of vibration, too.- hear it? a little bit of vibration, too. our main system- vibration