A uniform rod of negligible mass balances when a weight of 3 N is at A, weight of 3 N is at B and a...

A uniform rod of negligible mass balances when a weight of 3 N is at A, weight of 3 N is at B and a weight of W is at C. What is the value of weight W?

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Taking moments about the fulcrum, O then
Anti-clockwise moments = (3 × 1) + (3 × 3)
= 3 + 9 = 12 Nm
Anti-clockwise moments = clockwise moments
3 W = 12 Nm
W = 4 N

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Mutiso answered the question on October 11, 2018 at 18:47

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