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If an object is rotating without translating, then which of the following is true? a. sum of all forces acting on it is zero c.

If an object is rotating without translating, then which of the following is true? a. sum of all forces acting on it is zero c. the center of mass of this object lies outside the object b. sum of all torques acting on it is zero d. sum of all forces is equal to sum of all torques

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