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What is the formula to calculate the force generated by a given torque?
The formula to calculate the force created by a given torque is:
With :

is the force expressed in newtons [N] 
is the torque expressed in newtonsmeters [N.m] 
is the radius expressed in meters [m], note that , the length of the OP segment.
This formula can also be expressed in the general case with the cross product:
With :

is the force vector expressed in newtons [N] 
is the torque vector expressed in newtonsmeters [N.m] 
is the vector from rotation center to the point where the force is applied