In Order to Simulate Apparent Weightlessness for Astronauts in Training

In order to simulate apparent weightlessness for astronauts in training (when the astronauts do not push on a seat) ,they are flown in a vertical circle.If the passengers are to experience weightlessness,how fast should an airplane be moving at the top of a vertical circle with a radius of 2.5 km?

A) 79 m/s
B) 310 m/s
C) 260 m/s
D) 160 m/s
E) 510 m/s

Correct Answer:

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