For the mechanism in the posture shown, RAO2 =

68 in, the position of the mass center of block 3 is 4 in below pin A, and the kinematic coefficients Figure P12.51 RG3O2 = 200 mm, RCO2 = 350 mm, and

ρ3 = 50 mm.

of link 3 are R

3 = 57.72 in/rad and R

3 = 66.68 in/rad2 (where R3 is the vertical vector from point C fixed in link 3 to the x axis). The angular velocity and acceleration of the input link 2 are ω2 = 12kˆ rad/s and α2 = 15kˆ rad/s2, respectively. The masses and mass moments of inertia of links 2 and 3 are m2 = 19.84 lb, m3 = 15.43 lb, IG2 = 7 434 lb·in2, and IG3 = 6 726 lb·

in2, respectively. The torque acting on link 2 at the crankshaft O2 is T12 = −450kˆ in · lb. Gravity is in the negative y direction. Determine the internal reaction forces and the force P acting at point B on link 3. Is link 3 sliding or tipping on the ground link in this posture?