The Torsion Problem for Bodies of Revolution. 
Then we have 
dv 
M = V 
dr dr 
From 1, 2, and 3 we have 
A4 = V3=|,rr3; C, 
A5= V, 
15 
3^6 
S3 =: 47rr2 
-2^4 
12* 
