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A uniform metre rule is pivoted at the mark. If the metre rule is balanced by a load of weight placed at the mark and a force acting upwards at the mark as shown below, what is the magnitude of force F?
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mark. If the metre rule is balanced by a load of weight 
placed at the 
mark and a force 
acting upwards at the 
mark as shown below, what is the magnitude of force F?
.
