Calculate the stiffness(k) and natural period(T) of the structure as shown in the picture. (Ignore the structure's weight and assume the beam is infinite stiffness. g=9.81m/sec^2, E=205GPa, I=72.1*10^6mm^4)

B P A y W Find the Vertical Position of the Centroid marked as y on the Diagram using the transform section method, transforming all your material to Material A. Your Answer should be in mm to 1 decimal place. J-22.0 mm, P=76.8 mm, W-187.2mm, Young's Modulus of Material A = 64.5 GPa, Yield Stress of Material A = 145.9 MPa, Young's Modulus of Material B = 94.4 GPa, Yield Stress of Material B = 272.9 MPa.

Consider the stress element as shown in figure. Determine the total distortion energy stored in 1 m cube. (in kNm, round off to two decimal places). Assume Young's modulus of elasticity as 2 x 105 MPa and Poisson's ratio as 0.3. 100 MPa 50 MPa 50 MPa 100 MPa