26. Sphere moving perpendicularly to infinite rigid plane boundary, a/h small: 



'A Fluid 



8 a3 



7'=— pa^(l + + ....) f/^, as in Equation [130a] 



3 



with a = 0, 



1 / 3 a3 

 A;=- (1+ 



8 A3 



Only the force required to accelerate the sphere is considered here; see Section 130. 

 27. Sphere moving parallel to infinite rigid plane boundary, a/h small: 



3 a 



r = — p a^ 1 + + .... {/2, as in Equation [130a] 





16 .3 



with a = 90 deg. 



W = — -no a . 

 3 



1 + 



3 a^ 

 16 T^ 



28. Sphere moving past center of fixed spherical shell 



77 , 6^ + 2a^ „ 

 T = — pa^ t/"^, as in Equation [129eJ, 



3 b^-a^ 



M'=— TTo a^, 

 3 



1 h^ + 2a^ 



2 j3_^3 



29. Prolate spheroid (or ovary ellipsoid), a>h\ see Section 137: 



Let e = eccentricity of sections through axis of symmetry, 



1 ^2 



In 



1 + e 

 l-e 



1-e- 



1 1 + e 

 In 



l-e 



2 2 l-e 



390 



