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प्रश्न
A uniform metre rule of weight 10gf is pivoted at its 0 mark.
What moment of force depresses the rule?
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उत्तर
Anticlockwise moment = 10 gf x 50 cm = 500 gf cm
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Assertion & Reasoning
- Assertion: The sum of the clockwise moments is equal to the sum of the anticlockwise moments.
- Reason: The principle of conservation of momentum is valid if the external force on the system is zero.
