Question

You place a 1-meter ruler on a table and place and 150 g-weight on the ruler...

You place a 1-meter ruler on a table and place and 150 g-weight on the ruler at a distance of 16 cm from one end. You then extend the ruler over the edge until it exactly balances on the corner of the table. Then the ruler has been pushed out 41 cm above the edge. How much does the ruler weigh?

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Answer #1

As ruler is exactly balanced on the edge, force on ruler acts at edge. As ruler is balanced, torque on it about edge is zero. Torques on it are due to forces of weight placed on it and it's own weight. Weight of ruler acts at the centre of ruler.

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