Physics-
General
Easy

Question

A force of- F stack k with hat on top acts on O, the origin of the coordinate system. The torque about the point 1, -(a) is

  1. F open parentheses stack i with hat on top minus stack j with hat on top close parentheses    
  2. negative F open parentheses stack i with hat on top plus blank stack j with hat on top close parentheses    
  3. F open parentheses stack i with hat on top plus stack j with hat on top close parentheses    
  4. negative F open parentheses stack i with hat on top minus stack j with hat on top close parentheses    

The correct answer is: F open parentheses stack i with hat on top plus stack j with hat on top close parentheses



    tau equals r cross times F
    tau equals open parentheses stack i with hat on top minus stack j with hat on top close parentheses cross times left parenthesis negative F stack k with hat on top right parenthesis
    equals F left square bracket open parentheses negative stack i with hat on top cross times stack k with hat on top close parentheses plus open parentheses stack j with hat on top cross times stack k with hat on top close parentheses right square bracket
    equals F left square bracket stack i with hat on top plus stack j with hat on top right square bracket

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