The position vector of a point object of mass 1.6 kg as a function of

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The position vector of a point object of mass 1.6 kg as a function of time is given by r=7i+2tj-3t2k, where i, j, and k are unit vectors along the x-, y-, and z-axis respectively, r is in meters, and t is in seconds. Determine the magnitude of the total torque acting on the object about the origin at time t=4 s.

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