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A rocket's thrust falls with altitude in the same way as a jet engine's. True or false?

  • A.True, but the lapse is gentler
  • B.False, only because rockets fly higher
  • C.False, it takes in no air so there is no density term
  • D.True, all engines lose thrust with altitude

Answer: C

Thrust for an air breathing engine follows the mass flow it can process, which follows density. A rocket carries both propellants and takes in nothing, so neither density nor flight speed appears in its thrust equation at all.

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