1. A mass of 30 kg (shown in) is hung from a spring of stiffness k=2.5×10' N/m, which is attached to an beam of aluminum p=2.7×10³ kg/m³) (E=71×10° N/m², moment of inertia I=3.5×10 m² and of length 35 cm. The beam is supported at its free end and by a circular aluminum cable of diameter 1 mm and length 30 cm. Determine the equivalent stiffness of the assembly. Aluminum 1 mm diameter 30 cm 35 cm- Aluminum (2 Points) I= 3.5 × 10-8 m² 2.5 × 105 N/m 30 kg