The diagram shows a uniform metre rule. The rule is pivoted at its mid-point. A weight of 4.0 N is suspended from the rule at the 5 cm mark. The rule is held by a string at the 30 cm mark. The rule is in equilibrium.
What is the upward force that the string exerts on the rule?
1 )
0.67 N
2 )
4.0 N
3 )
6.0 N
9.0 N
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