題組內容

5. 25pts   Two slender rods, each of length I and mass m, are released from rest in the position shown. Knowing that a small knob at end B of rod AB bears on rod CD, determine immediately after release (a) the acceleration of end C of rod CD, (b) the force exerted on the knob. Write your final answer in the form:
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( (a) ac = _________(15pts)；