# Example 9.1      
 Aplate   =   100.0 cm^2 
 Arivet   =   1.0 m^2 

# Example 9.2      
 n  =   80.0 rpm 
 r  =   16.0 mm 
 V1 = r * n ; mm/s  
 t  =   2.0 hr 
 S = V1 * t ; mm 
 F1  =   20.0 N
 Hpin_copper   =   785.0 Mpa
 wpin_copper   =   2.7 mm^3
 Kpin = wpin_copper * Hpin_copper / F1 / S  
 Hdisk_steel  =   2060.0 Mpa
 wdisk   =   0.65 mm^3
 Kdisk = wdisk *  Hdisk_steel / F1 / S  

# Example 9.3     
 F0  =   2000.0 N
 R1   =   5.0 mm
 E1   =   207.0 Gpa
 n1   =   0.3 
 R2   =   -5.05 mm
 E2   =   110.0 Gpa
 n2   =   0.3 
 D1 = (1 - n1^2) / E1 + (1 - n2^2) / E2  ; m^2/N 
 p0 = 0.578 * (F0 * (1/R1 + 1/R2)^2 / D1^2)^(1/3)  ; Mpa

# Homework Problems:

TBD