(20)

with the notation

A or Aλ = ∫∞λ abc dλ
(a2 + λ) P
= −2abc d∫∞λ dλ,
da2 P

(21)

so that in (4)

φ = MxA = UxA,   φ1 = xAλ,
abc 1 − A01 − A0

(22)

in (1) for an ellipsoid.

The impulse required to set up the motion in liquid of density ρ is the resultant of an impulsive pressure ρφ over the surface S of the ellipsoid, and is therefore