[填空题]
You are an astronaut in the space s4wlu)zaq 2bez 0l. ki.hrb vcq( ea//n *du-re l7/q1kkuttle pursuing a satellite in need of repair. You are in a circular orbit of the same radius as the satellite (400 km above the Earth), but bke/ l7*ardvucek/ - /qn1rq(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?$\approx$ $\times 10^3$
