Chapter 25

2. cargo.
3. shifts its input and output ratios.
5. a type of orbit in which a satellite travels the same speed the earth is
6. a system that controls and directs the power of an engine to do work.
9. the part of a long-distance truck where the power and operator units are placed.
10. a type of power source attached to the stern of a boat.
11. transmissions that use valves to change hydraulic pressure so the
14. an engine used in most commercial aircraft in use today. It operates at lower
15. earth.
17. a lighter-than-air nonrigid airship.
19. a type of special boat that has a normal hull and a set of underwater wings.
21. space fl ights that use rockets to place payloads into orbit.
24. a vehicular system that controls the speed and direction of the vehicle.
25. than a turbojet engine.

1. a vehicular system that produces proper support for the weight of the vehicle
4. air vehicles that use either a light gas or hot air to produce lift.
7. industry that makes money by transporting people and cargo in airplanes.
8. the last layer of space above the earth that blends directly into outer space.
12. a space flight that carries human beings into space and returns them safely to
13. a large flat plate at the stern of a ship, used to guide the vessel.
16. the region above the troposphere.
18. cargo-carrying ships.
20. the point at which an orbit comes closest to earth.
22. rigid airships with metal frames covered with skins of fabric.
23. the region lying just above the mesosphere. It is also called the thermosphere.