[填空题]
You are an astronaut ibzo8s +6ywx(qr 8jd6hn the space shuttle pursuz cs)p,zi ;zvr m0jq7ak::qv 9ing a satellite in need of repair. You are in a circular orbi7q0) m,isz q rz;c 9z::javpkvt of 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?$\approx$ $\times 10^3$
