great cirlce
flying around the globe, all parts of the aircraft travel the same distance. their displacement is exactly the same, since if say it lands at the exact same spot, the noses it back where it started, and the tail is back where it began. providing it's altitude was constant. the actual distance above the earths surface (which would differ as you flew over mountains/sea etc.) wouldnt have an effect since you are effectigvely in free space.
re: the bullet question, don't forget all objects have a terminal velocity. a bullet only travels at the speed of a bullet because 'g' is a variable in working out it's acceleration, so free falling at the speed of a bullet only means the speed (i presume) that a bullet travels horixontally, so it would accelerate from the gun at a great rate, and then maintain that relative speed
heres another load;
1)
1 costs £10, 2 costs £10 and 17 costs £20.
what are they?
2)
a fly hits your card windscreen at 5mph. you are traveling at 50mph. at a split second the fly is stationary, yet your speed does NOT alter atall. how come?!
3)
the Earth's upper atmosphere is radiated with high energy particles from the sun (solar wind) creating a steady stream of positive ions, which, rain down onto the Earth's surface. But the earth's total average surface charge does not change. Why?
more soon if i can remember them