  The Bogoliubov theory of a uniform weakly-nonideal Bose-Einstein condensate
leads to a divergent expression for the kinetic energy of atoms. However, the
latter can be determined provided that the dependence of the scattering length
on atomic mass is known. The explicit expressions are derived for the kinetic
energy through parameters that specify interatomic interaction. The kinetic
energy of condensate atoms noticeably exceeds the total energy. Numerical data
are presented for Rb-87 and Na-23 condensates.
