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Q.

A uniform rod is 4m long and weighs 10kg . If it is supported on a knife edge at one metre from the end, what weight (in kg) placed at that end keeps the rod horizontal? 

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answer is 10.

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Detailed Solution

Taking knife edge as reference torque due to 𝞽w=𝞽10kg 

w×1=100×1 ⇒w=100N

Mass of weight is 10 kg.

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