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To find \( \frac{2}{3} \vec{u} \), you simply multiply each component of the vector \( \vec{u} = (1, 3) \) by \( \frac{2}{3} \). So, for the first component: \( \frac{2}{3} \times 1 = \frac{2}{3} \), and for the second component: \( \frac{2}{3} \times 3 = 2 \). Thus, \( \frac{2}{3} \vec{u} = \left(\frac{2}{3}, 2\right) \). Now you've scaled the vector! This scaling is crucial in various fields, like physics and engineering, where you might want to adjust forces or velocities to fit a new context while maintaining their direction. Enjoy exploring how these operations work in the real world!