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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 placed at that end keeps the rod horizontal?

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12 kg

10 kg

16 kg

8 kg

answer is B.

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Detailed Solution

The sum of moments of weight attached and the weight of rod about the point where the knife is placed,

$w \times 1 = 10 (9.8) \times 1$

So the weight kept at the other end is m = 10kg.

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