1). ?Fz Nerva seems to have followed the custom of announcing the general lines of his future policy.
If a i, a 2 represent the densities of the two infinite solids, their mutual attraction at distance z is per unit of area 21ra l a fZ '(z)dz, (30) or 27ra l 02 0(z), if we write f 4,(z)dz=0(z) (31) The work required to produce the separation in question is thus 2 7ru l a o 0 (z)dz; (32) and for the tension of a liquid of density a we have T = a f o 0 (z)dz.
For f0(z)dz =0(z).z - fz d dz) dz =0(z).z+fz4,(z) dz.
How would you define fz? Add your definition here.