For the linkage in the posture shown, force P =

10 lb is applied on link 4. A torque T12 is acting on link 2 at the crankshaft O2 to hold the linkage in static equilibrium. Gravity is acting into the plane and friction in the linkage can be neglected.

Is the impending motion of link 3 slipping or tipping in link 4? Is the impending motion of link 4 slipping or tipping on the ground link?

Determine the magnitudes, directions, and locations of the internal reaction forces in the linkage.

Determine the magnitude and the direction of the torque, T12. Syc = 200 MPa. Using the theoretic values for the end-condition constants of each link, determine:

(a) the slenderness ratio, the critical load, and the factor of safety guarding against buckling of link 2; and

(b) the minimum diameter Dmin of link 3 if the static factor of safety guarding against buckling is to be N = 2.