[填空题]
A projected space station consists of a circular tube that willme.hla 2gvque*z47 g6 r9/io-xf*ttt iotate about its center (like a tubular bicycle tire iix9ftt-ot* /) (Fig. 5–42). 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?$\approx$ $\times 10^3$
