[填空题]
You are explaining w*u-soj-*co h-r,qta ohy astronauts feel weightless while orbiting in the spcxi:)2l i 9ozgace shuttle. Your friends respond that they thought gravity was just a lot weaker up there. Convince them and yourself that it isn’t so by calculating the acceleration of gravityilz)i9g2:o cx 250 km above the Earth’s surface in terms of g.
