A torque Tr(or turning effect) is what causes an object to rotate.
It is defined  as a force (the 50N) times the lever arm of the force ( 24cm)
The lever arm is the perpendicular distance from the force to the axis of rotation. (the nut here).
or : Tr = F l     here Tr = 50 x 0.24 = 12.0 N.m
If the net torque (sum of all torques) is zero, the object will not rotate.

 TORQUES

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use the hints only if you are confused.
Main idea: torque = distance x force  
The units for force is N, the units for distance is m so the units for torque is N.m

LAB TORQUE
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