5. A uniform half metre rule can be balanced aupwards at the 100 cm ma

1.	5. A uniform half metre rule can be balanced aupwards at the 100 cm mark.29.0 cm mark when a mass 20 g is hung from itsend.(a) Draw a diagram of the arrangement.(b) Find the mass of the half metre rule.(C) In which direction would the balancing pomshift if 20 g mass is shifted inside from its oneend ?
Answer» Let the weight of the half metre RULE be x gf and it acts at the 25 cm mark (centre of GRAVITY). Now, Acticlockwise moment = x×4 Clockwise moment = 20×21 In equilibrium, Anticlockwise moment = Clockwise moment 4x=20×21 x=105 gf. Thus, the weight of the metre rule is 105gf. We know, one gf is the force acting on the BODY of mass 1 GRAMS, thus mass of the body is 105grams.

5. A uniform half metre rule can be balanced aupwards at the 100 cm mark.29.0 cm mark when a mass 20 g is hung from itsend.(a) Draw a diagram of the arrangement.(b) Find the mass of the half metre rule.(C) In which direction would the balancing pomshift if 20 g mass is shifted inside from its oneend ?

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