3-15. The spring has a stiffness of k = 800 N/m and an unstretched length of 200
mm. Determine the force in cables BC and BD when the spring is held in the
position shown.
3–19. The unstretched length of spring AB is 3 m. If the block is held in the
equilibrium position shown, determine the mass of the block at D.
*4–80. Determine the required magnitude of force F if the resultant
couple moment on the frame is 200 lb-ft, clockwise.
7–12. Determine the internal normal force, shear force, and the moment at points C
and D.
7–24. Determine the internal normal force, shear force, and bending moment at
point C.
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