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प्रश्न
State the principle of moments. A meter scale is pivoted at 30 cm mark and it is in equilibrium when a mass of 40 g is suspended from 10 cm mark. Calculate the mass of the ruler.
उत्तर
Principle of moments : If a body is in equilibrium under the action of number of force, then the sum of clockwise moments is equal to the sum of anticlockwise moments.
Sum of clockwise moments = sum of anticlockwise moments
40 x 20 cm = mass of scale x 30 cm
or Mass of scale = `800/30` = 26.7 g
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संबंधित प्रश्न
The figure shows a uniform metre rule placed on a fulcrum at its mid-point O and having a weight 40 gf at the 10 cm mark and a weight of 20 gf at the 90 cm mark.
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