Across
- 2. giant cross-bow
- 5. paddle at the back of a ship for steering
- 7. generates and detects sound waves
- 12. study of objects moving through the air
- 13. gun barrel with a spiraling groove
- 14. underwater vehicle
- 15. radar that uses change in frequency to determine the speed and direction that an object is moving
- 16. lever with the fulcrum between the effort and the weight
- 17. the upward force that a liquid or gas exerts on an object
- 20. lever with the effort between the weight and the fulcrum
- 21. SOund Navigation And Ranging; use of sound waves to detect objects
Down
- 1. wing-like attachment to the side of a submarine for stability and diving
- 2. material carried for the purpose of changing the weight of a vehicle
- 3. lever with the weight between the fulcrum and the effort
- 4. sends and receives sound waves in code for communication
- 6. RAdio Detection And Ranging; use of radio waves to detect objects
- 8. gun barrel that is smooth and polished inside
- 9. submarine designed to operate at deep level of the ocean
- 10. frequency of light and sound waves changes as the object moves toward or away from you
- 11. only detects sound waves
- 18. outside shell of a ship
- 19. propeller for moving a submarine