I tried making r1,r2,r3 in parralell, then took r1r2r3equiv and r4 in series, th

Question

I tried making r1,r2,r3 in parralell, then took r1r2r3equiv and r4 in series, then i put r5 and r7 in series, then i put req12354 and req57 and r6 as in parralel....but I got the wrong answer. Please help.

EXPLANATION/WORK IS NEEDED*** I have exam in 1 week!!Thanks

A column is fabricated In connecting the rolled-steel members by bolts. as shown in Figure 2. determine (l) the location of the centroid, C of the section: (2) the moment of inertia Iz, Iy with respect to axes z and yz (3) the first moment of area of the top plate to axis z (Note: The properties of C 250 x 37 can be found from Appendix C (Page 751) of Beer el al. (2009). Mechanics of Materials. 5th Edition. Me Graw Hill.)

Explanation / Answer

Ra = (R1 II R2 II R3) + R4 = 30ohm

Req = (Ra II R5 II R6) + R7 =55 ohm

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