What is an accretion disk? a) any flattened disk in space, such as the disk of the milky way galaxy. b) a disk of hot gas swirling rapidly around a white dwarf, neutron star, or black hole. c) a stream of gas flowing from one star to its binary companion star. d) a disk of material found around every white dwarf in the milky way galaxy.

To place a communications satellite into a geosynchronous orbit at an altitude of 22,240 mi above the surface of the earth, the satellite first is released from a space shuttle , which is in a circular orbit at an altitude of 185 mi, and then is propelled by an upper-stage booster to its final altitude. as the satellite passes through a, the booster's motor is fired to insert the satellite into an elliptic transfer orbit. the booster is again fired at b to insert the satellite into a geosynchronous orbit. knowing that the second firing increases the speed of the satellite by 4810ft/s, determine (a.) the speed of the satellite as it approaches b on the elliptic transfer orbit, (b.) the increase in speed resulting from the first firing at a.