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ããcharacterize an object's angular acceleration due to torque.
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ããæªé¢æ¯æ§ç©ï¼the area moment of inertia
ããcharacterized an object's ability to resist bending and is required to calculate displacement.
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ããIp: the torsional moment of inertia
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ããa quantity to predict an object's ability to resist torsion, to calculate the angular displacement of an object subjected to a torque.
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