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A large steel bar of length ℓ is hinged at one end to a wall. A...

A large steel bar of length ℓ is hinged at one end to a wall. A mechanic holds the other end so that the bar is parallel to the ground and places a penny on the bar right at the end he is holding. What is the rotational acceleration of the bar when he lets go? Use the notation l for the length of the bar ℓ. Express your answer in terms of acceleration due to gravity g and the variable l.

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