To calculate the moment of inertia for a rectangle about its centroid (ignoring the parallel axis theorem), you can use the following formula: Moment of Inertia (Iy) = (1/12) * base * height^3 Given, the height of the rectangle (h) is 120 mm, and the base (b) is 240 mm, you can now plug the values into the formula: Iy = (1/12) * 240 * (120)^3 Iy = (1/12) * 240 * (1728000) Iy = 20 * 1728000 Iy = 34,560,000 mm^4 So, the y-component of the Moment of Inertia of a Rectangle with height 120 mm and base 240 mm is 34,560,000 mm^4.