The Journey of Flight.pdf - Valkyrie Cadet

Chapter Chapter Chapter 23 23 - - Orbits Orbits and and TT
Trajectories T rajectories
d. circular orbit
e elliptical orbit
f. equatorial orbit
g. escape trajectory
h. apogee
i. perigee
7. Escape velocity is defined as ____________________________________.
8. The ___________ _____________ __________ represents adding together all the velocity
requirements for all stages of the mission.
9. The moment a rocket engine ceases to produce thrust, __________ is said to have occurred and
the velocity required to achieve the intended _____________ must be attained.
10. Ballistics is the study of ________________________________.
11. The trajectory of a _____________ ________ is straight up.
12. Moving a vehicle from one orbit to another is called a ______________; if accomplished within
the same orbital plane, it is called _________ ______________.
13. A Hohmann transfer is also known as a __________ _________ ________.
TRUE OR FALSE
14. The payload, fuel load and deadweight make up takeoff mass.
15. Retrothrust is defined as thrust in the opposite direction usually used to slow a vehicle.
16. Ballistic flight is concerned with propelling an object from the Earth’s surface to non-orbital
space flight.
17. A bullet is a good example of ballistic flight.
18. Most fast transfers are only slightly different from Hohmann transfers.
SHORT ANSWER
(4) Point where a body orbiting Earth is closest to it
(5) Property that causes a body in motion to remain in motion
(6) A non-circular path around a body
(7) Path of a body through space
(8) Maintained at a virtually constant altitude above the Earth’s surface
(9) Point where a body orbiting the Earth is farthest from it
19. Why are lower velocities required for satellites to stay in orbit at higher altitudes?
20. Briefly describe the Hohmann transfer.
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