[填空题]
You are explaining why astronauts feelmnx60 ;jjjks3 weig)a9mhwkj c(xiy8/t n1 htless while orbiting in the space shuttle. Your friends respond that they thought gravity wa 1acim(8/yw jnt9 k)hxs just a lot weaker up there. Convince them and yourself that it isn’t so by calculating the acceleration of gravity 250 km above the Earth’s surface in terms of g.
