[填空题]
You are an astronaut in t 5(+2-3yep-ifaxr4z : vtjew3).me cmauxjnxhe spacevre6 + 9wg7uz7ldsx7 o shuttle pursuing a satellite in need of repair. You are in a circular orbit of6w s7ouv9+zxrd7 gle7 the same radius as the satellite (400 km above the Earth), but 25 km behind it.
(a) How long will it take to overtake the satellite if you reduce your orbital radius by 1.0 km?$\approx$ h
(b) By how much must you reduce your orbital radius to catch up in 7.0 hours?$\approx$ $\times 10^3$
