I now want to return to the idea of complete weightlessness and I want to remind you, a few lectures ago how I was swinging you at the end of a string in the vertical.
2
而且由于空气阻力,不可能完全失重-,不过如果十分接近大气层顶端-,那么空气阻力便可以忽略。
However, if you could jump up way - near the top of the atmosphere — - where the air drag is negligible — then you would be weightless for quite some time.
3
飞行过程是完全自动化的,但是如果失重令加加林情绪失控随之打乱预定程序控制该怎么办?
The flight was to be fully automatic, but what if weightlessness caused Gagarin to go mad and override the programmed controls?