Repeat problem by using the dot product method.
Problem: Repeat problem for a 60o internal angle.
Problem: The link length of a planar four-bar mechanism are r0=120, r1=60, r2=140, and r3=80. Find the orientation of links 2 and 3 when the internal angle between the crank and the fixed link is 30o and the linkage is in the open phase (i.e. the coupler does not cross the fixed link). Use the vector cross-product method.
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