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A long meter rule is pivoted at the mark as shown below. If the weight of the meter rule is , where must a force of magnitude act on the meter rule in order to keep it balanced?
mark
mark
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long meter rule is pivoted at the 
mark as shown below. If the weight of the meter rule is 
, where must a force of magnitude 
act on the meter rule in order to keep it balanced?
mark
mark
mark
