A barbell consists of two small balls, each with mass 500 grams (0.5 kg), at the ends of a very low mass rod of length d = 20 cm (0.

A barbell consists of two small balls, each with mass 500 grams (0.5 kg), at the ends of a very low mass rod of length d = 20 cm (0.2 m). The center of the barbell is mounted on the end of a low mass rigid rod of length b = 0.3 m (see Figure), and this rod rotates clockwise with angular speed 130 rad/s. In addition, the barbell rotates clockwise about its own center, with an angular speed 110 rad/s.