MU-MIMO 10 hrs Ultra-Fast Wireless Speed Up to 10-Hours Battery Life 3.3 COPLANAR FORCE SYSTEMS 97 FUNDAMENTAL PROBLEMS All problem solutions must include an FBD. F3-1. The crate has a weight of 550 lb. Determine the force in each supporting cable. F3-4. The block has a mass of 5 kg and rests on the smooth plane. Determine the unstretched length of the spring. B 30° D A-200 N/m 0.3 m 0.4 m Prob. F3-1 F3-2. The beam has a weight of 700 lb. Determine the shortest cable ABC that can be used to lift it if the maximum force the cable can sustain is 1500 lb. Jous 136 Prob. F3-4 F3-5. If the mass of cylinder C is 40 kg, determine the mass of cylinder A in order to hold the assembly in the position shown. D 30 40 kg 10 ft Prob. F3-2 F3-3. If the 5-kg block is suspended from the pulley B and sag the of the cord is d=0.15 m, determine the force in cord ABC. Neglect the size of the pulley. 0.4 m Prob. F3-5 F3-6. Determine the tension in cables AB, BC, and CD. necessary to support the 10-kg and 15-kg traffic lights at B and C, respectively. Also, find the angle #. d-0.15 m Ber 15 Prob. F3-6 F11 F12

E/Y Q4. Select the diameters of the ties AB and CD (see figure) if the load P is 10 t, and the allowable stress [σ] for the material of the ties is 1000 kg/cm2. Answer: CIAB - 424 mm; dc0 = 25.2 mm P 1m 1 B D -im- -Im- im

The three-plate moment connection shown below are all shop- welded- to the column and then field bolted to the girder. The beam is a W18 55 that has a factored moment of Ma = 382 kip ft and a factored shear of V. = 65 kip. All plates are A36 steel (E = 36 ksi, Fu = 58 ksi). Plate 2 is connected to the girder using four bolts as shown. All bolts for the connection are 7/8" diameter A325-X. Plate 1 Plate2 2.00" 2.75" W18 55 2.75" 2.75" 2.00" `Plate3 3.00" 2.50" (a) Design Plate 1, including the required number of bolts and dimensions of the plate. Assume an E70XX weld to the column. Consider limit states only for the plate itself. That is, you do not need to consider limit states for the beam or column. (b) For which plate(s) will you need to check the buckling capacity, Plate 1, 2, and'or 3? Explain.

Classify structurc shown bclow as stablc or unstablc. If stablc, dcterminc whcther statically determinate or statically indeterminate. Explain your reasoning. If statically indeterminate, specify the degree of statical indeterminacy. Telles lixed