I am. outraged at the university's treatment of a retired professor.. Mark of Excellence The matter of the practical benefits of emeritus status, however, is amoot point at many institutions, especially community colleges, thatlack resources to share with retired faculty members.
Dear publish1000-ga; You posed a great question. The answer is really much simpler than it first appears. The US Space Shuttle uses a rocket propulsion system to get into its final orbit in its approach to Earth. Other than that the Shuttle is essentially falling and during re-entry the aircraft is actually a glider. The reentry speed is largely dictated by the Earth gravitational pull and given the physics of such a reentry the speed is typically approximately 25,405 feet per second (17,322 statute miles per hour).
To leave Earth's orbit, the spacecraft has to fly faster than Earth's escape velocity (the velocity required to escape the gravitational influence of Earth on the spacecraft). Prior to the third stage firing, the spacecraft is only going about 19,500 mph and it is stuck orbiting Earth.o leave Earth's orbit, the spacecraft has to fly faster than Earth's escape velocity (the velocity required to escape the gravitational influence of Earth on the spacecraft). Prior to the third stage firing, the spacecraft is only going about 19,500 mph and it is stuck orbiting Earth.