Physics-
General
Easy

Question

A solid cone hangs from a frictionless pivot at the origin O, as shown. If stack I with hat on top comma stack j with hat on top text end textand stack k with hat on top 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 subscript z end subscript?

  1. F equals a stack k with hat on top comma P text  is  end text left parenthesis 0 comma b comma negative c right parenthesis    
  2. F equals negative a stack k with hat on top comma P text  is  end text left parenthesis 0 comma negative b comma negative c right parenthesis    
  3. F equals a stack j with hat on top comma P text  is  end text left parenthesis negative b comma 0 comma negative c right parenthesis    
  4. None    

The correct answer is: F equals a stack j with hat on top comma P text  is  end text left parenthesis negative b comma 0 comma negative c right parenthesis

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