Question 4: Brown, flying in an F-80, intercepted two North KoreanMiG-15s near
the Yalu River and
shot them down in the first jet-to-jet ________ in history.
Question 6: The ________, while far faster than the X-43 or X-15, is not
regarded as a jet aircraft during ascent, nor during reentry and
landing (as it is unpowered
during this phase of operation).
Question 7: The speed of sound
predominantly depends on air temperature (hardly at all on ________), so the Mach number
for the speed of a jet also varies with atmospheric conditions.
Question 9: About the same time, the United
Kingdom's ________ was limited to defense of the UK against the V1 flying
bomb and ground-attack operations over Europe in the last months of
the war.