B)A uniform metre rule balances horizontally on a knife edge placed at

1.	B)A uniform metre rule balances horizontally on a knife edge placed at the 54cm mark when a weight of 20 gf is suspended from one end.(i)Draw a diagram of the arrangement.(ii)What is the weight of the rule ?
Answer» Answer: Weight mg (W) of rule produces an anti-clockwise moment about the knife edge O. In order to BALANCE it, 20gf MUST be SUSPENDED at the end B to produce clockwise moment about the knife edge O. (ii) From the principle of moments, Anticlockwise moment = Clockwise moment W × (58-50) = 20gf × (100 − 58) W × 8 = 20gf × 42 W = 20gf x 42/8 = 105 gf

B)A uniform metre rule balances horizontally on a knife edge placed at the 54cm mark when a weight of 20 gf is suspended from one end.(i)Draw a diagram of the arrangement.(ii)What is the weight of the rule ?

Answer»

Answer:

Weight mg (W) of rule produces an anti-clockwise moment about the knife edge O. In order to BALANCE it, 20gf MUST be SUSPENDED at the end B to produce clockwise moment about the knife edge O. (ii) From the principle of moments, Anticlockwise moment = Clockwise moment W × (58-50) = 20gf × (100 − 58) W × 8 = 20gf × 42 W = 20gf x 42/8 = 105 gf

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B)A uniform metre rule balances horizontally on a knife edge placed at the 54cm mark when a weight of 20 gf is suspended from one end.(i)Draw a diagram of the arrangement.(ii)What is the weight of the rule ?

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