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At 40°C, a brass wire of 1 mm is hung from the ceiling. A small mass, M is hung from the free end of the wire. When the wire is cooled down from 40ºC to 20ºC it regains its original length of 0.2 m. The value of M is close to :(Coefficient of linear expansion and Young's modulus of brass are 10⁻⁵/ºC and 10¹¹ N/m², respectively; g = 10 ms⁻²)(A) 0.5 kg (B) 9 kg(C) 0.9 kg (C) 1.5 kg |
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Answer» 9kg |
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