[填空题]
A projected space station consists of a48tzmq 4q.rslofb g,ce7.l v : cir8u 34:m q kfmu)vtlji4cular tube that will rotate about its center (like a tubular bicycle tire) (Fig. 5–4uv4m :8u) tq3lm j4ifk2). The circle formed by the tube has a diameter of about 1.1 km. What must be the rotation speed (revolutions per day) if an effect equal to gravity at the surface of the Earth (1.0 g) is to be felt?$\approx$ $\times 10^3$
