Physics
A uniform metre rule is pivoted at its mid-point. A weight of 50 gf is suspended at one end of it. Where should a weight of 100gf be suspended to keep the rule horizontal?
Force
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Answer
Let us assume that a 50 gf weight produces an anticlockwise moment about the middle point ( 50 cm ).
Now, if a weight of 100 gf produces a clockwise moment about the middle point and d cm be the distance from the middle.
As we know, the principle of moments states that
Anticlockwise moment = Clockwise moment.
Therefore, a weight of 100gf will be suspended at a distance of 25cm to keep the ruler balanced.
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