Consider the printed circuit board (PCB) mounted on a cantilevered aluminum bracket shown in Fig. 4.23(a). Design the bracket to withstand an acceleration level of \(100 g\) under the rectangular pulse shown in Fig. 4.66. Assume the specific weight, Young's modulus, and permissible stress of aluminum as \(30 \mathrm{kN} / \mathrm{m}^{3}, 70 \mathrm{GPa}\), and \(180 \mathrm{MPa}\), respectively.

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PCB, weight 3N A -250 mm 13 mm Section A-A Acceleration 100g 0 to = 0.1 s (b) (a) FIGURE 4.23 A cantilever subjected to an acceleration pulse.