4 in. P 3 in. В 1200 N 3. A bar, show to the right, has a rectangular cross section of 3 in. by 4 in. and is fixed to the floor at D, and is loaded with three forces: PA = 120 kips, PB = 360 kips, and...

Extracted text: 4 in. P 3 in. В 1200 N 3. A bar, show to the right, has a rectangular cross section of 3 in. by 4 in. and is fixed to the floor at D, and is loaded with three forces: PA = 120 kips, PB = 360 kips, and Pc = 540 kips. Determine: (a) the reaction at the floor, RD; specify the direction ( ↑ or I ), and (b) the normal stresses in each of the three pieces, AB, BC, and CD; specify tension (T) or compression (C) for each. Ans: Rp = 300 kips T, oaB = 10 ksi (C), obC = 20 ksi (T), OCD = 25 ksi (C) В D 7 in. 6 in. 8 in.