In bubble tea with pearls, a popular drink from Taiwan, balls of tapioca are put into cold tea mixed with sugar and milk. Some of the balls fall to the bottom of the cup, others rise to the surface, and a few hang motionless in the liquid.

(a) If the tea mixture has a mass density of \(1350 \mathrm{~kg} / \mathrm{m}^{3}\), what is the approximate mass of a ball that neither rises nor falls and just fits into a straw that has a diameter of \(10 \mathrm{~mm}\) ? 

\((b)\) Do you expect the ball to continue to hang motionless if the temperature of the mixture changes?