[填空题]
You are an astronaut in the space shuttlec)4edg3b 0uqr :iedi9 pursuing a satellite in neinn /qx*4cxo1ed of repair. You are in a circular orbit of the same radius as the satellite (400 km above the Earth 4qco1xx* inn/), 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?$\approx$ $\times 10^3$
