A continuous cable of total length 4 m is wrapped around the small pulleys at A, B, C, and D. If each spring is stretched 300 mm, determine the mass m of each block. Neglect the weight of the pulleys and cords. The springs are unstretched when d = 2 m.
Wednesday, September 16, 2015
3_1_f
Determine the force in each cable and the force F needed to hold the 4-kg lamp in the position shown. Hint: First analyze the equilibrium at B; then, using the result for the force in BC, analyze the equilibrium at C
3_1_e
The unstretched length of spring AB is 2 m. If the block is held in the equilibrium position shown, determine the mass of the block at D.
3_1_d
a 200-kg engine is suspended from a vertical chain at A. A second chain is wrapped around the engine and held in position by the spreader bar BC. Determine the compressive force acting along the axis of the bar and the tension forces in segments BA and CA of the chain. Hint: Analyze equilibrium first at A, then at B.
3_1_c
The gusset plate is subjected to the forces of four members. Determine the force in member B and its proper orientation 
for equilibrium. The forces are concurrent at point O. Take F = 12 kN.
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