3. Find the location of the centroid of the built up section (X, Ỹ) composed of a C380x74 channel welded to a W360x122 I-beam. Calculate the moment of inertia (second moment of area) of the built up beam about both its centroidal axes. BUILT UP SECTION SYMMETRIC ABOUT y1-y1 AXIS C380x74 AREA: 9480 mm^2 381- y1 lyc: 168x10^6 mm^4 Ixc: 4.60x10^6 mm^4 CENTROID OF C380x74 ус 20.3 363 x1- W360x122- х1 XC- XC AREA: 15500 mm^2 381.2 ус Ixx: 365x10^6 mm^4 ALL DIMENSIONS lyy: 61.5x10^6 mm^4 IN MILLIMETERS

A truss is pinned at joint C and is simply supported at joint A, as shown in Fig. 2a. Each member of the truss is made of A-36 steel and has a diameter of 20 mm. Using Conservation of Energy Method, find the vertical deflection of joint D. 4 m 3 m B 3 m 20 kN Fig. 2a

Two parallel conducting wires lie along the direction of the z axis as shown. Wire 1 crosses the x-axis at x = -1.23 cm and carries a current of 2.64 A out of the xy-plane of the page. Wire 2 crosses the x axis at x = 1.23 cm and carries a current of 6.41 A into the xy plane. At which value of x (in cm) is the magnetic field zero? y ४ Questic In the flows Find t the tw Wir Wir

100 mm Determine the principal moments of inertia for the T 400 mm beam's cross-sectional area with respect to an axis passing through centroid. 100 mm 600 mm 400 mm 100 mm