(a) Locate the centroid (x, y) of the member's cross-sectional area of the object shown in Fig. 3. This item features a semicircular notch at the bottom, with a radius of 25 mm. (b) Locate the center of mass (x, y, z) of this object. Assume it is homogeneous and has a length of 100 mm in the z-direction. Note: please pay attention to the direction of the coordinate axes to determine the correct coordinates. N 30 mm 60 mm 40 mm -50 mm 50 mm- Fig. 3 50 mm x Thin disk 1₁ = /mr² 1,-1,-1mr² Thin rectangular plate 1=m(b² + c²) 1,- mc² 1=mb²

explain the importance of principle Safety.

How do civil engineers apply principles of computational electromagnetics and grounding system design to ensure safety and protect sensitive electronic equipment from electrical faults and lightning strikes