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Chapter 21 Technology

1. The locomotive/motorcycles should has a deceleration system

2. 3-D printing, there should be an object to rotate, rotation.

3. Fake teeth can be metal wrapped in wax. (too much hardness
wears away teeth)

4. Strong acid can dissolve garbage.

5. Pet sports/animal sports, power generation methods. Animal
rotates electricity generator to create power generation.

Let the animal turn the generator. Power generation.

6. Tilt or slope the road to prevent flooding, to be able to drain
Curved roads for draining water to prevent flooding.

7. Artificial platform roads to prevent the sea from rising or

covering the land. A road with pillars stands above the water.
8. 1. Confusion occurs when the voltage direction is opposite to
the current direction.

9. 2. If there is no ground voltage and the current direction is
unknown, an error will occur.

10. Fuel cells involve combustion and electrochemistry, so
wasting and not charging can be a problem.

11. Large-scale production of OLEDs requires the film to be
changed to a thick film.

12. Acceleration / time is a new vocabulary

Example 1: v(t)= ct ^ 2 v(t)/ t = 2ct ;; Example 2: v(t)= ct ^
3,v(t)/ t = 3ct ^ 2 v(t)/ t ^ 2 = 6ct t = time v(t) = speed.

13.Pedestrian safety. Red light for pedestrians when cars want to