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A solid cone hanges from a frictionless ...

A solid cone hanges from a frictionless pivot at the origin `O`, as shown. If `hat i, hat j` and `hat k` are unit vectors, and `a,b`, and `c` are positive constants, which of the following forces `F` applied to the rim of the cone at a point `P` results in a torque `tau` on the cone with a negative component `tau_(Z)` ?
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