Statics and Dynamics Quiz
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A uniform slender rod of length L=1.2 mL = 1.2 \text{ m} and mass m=3 kgm = 3 \text{ kg} is pinned at one end (point O) to a fixed wall and released from rest in the horizontal position. As the rod swings downward, a small block of mass M=1.5 kgM = 1.5 \text{ kg} rests on the rod at a distance dd from the pin. The block is free to slide along the rod without friction.
Immediately after release from the horizontal position, what is the minimum distance dd from the pin O at which the block must be placed so that the block does not press against the rod (i.e., the normal force between the block and rod is zero)?
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