Page 31 - "Textbooks are Wrong" by James Hong, English Edition

reason.

6.17. Fluid mechanics
In fluid mechanics, the Navier Stokes equation proves to be

wrong.

6.18 Circuit Design Related
1. Confusion occurs when the voltage direction is opposite to the

current direction.
2. If there is no ground voltage and the current direction is

unknown, an error will occur.

6.19 More Technology

1. Fuel cells involve combustion and electrochemistry, so

wasting and no charging can be a problem.

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

6.20 Acceleration / Time
Acceleration/time is a new vocabulary that can be applied to

v(t)= ct ^ 3
V(t) is the speed t = time = time

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

6.21 E in the tensile test formula
F = strength A = cross section area dL = length extension L = original
length
F/A = E dL/L

F/(dL/L) = E
The larger dL/L is, the smaller E is.
What Represents E is stiffness Stiffness. Not Elasticity or ductility.