At 40∘C, a brass wire of 1 mm radius 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 40∘C to 20∘C 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/∘C and 1011Nm−2 respectively; g=10 ms−2)

At 40∘C, a brass wire of 1 mm radius is hung from the ceiling. A sma

1.	At 40∘C, a brass wire of 1 mm radius 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 40∘C to 20∘C 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/∘C and 1011Nm−2 respectively; g=10 ms−2)
Answer» At $40^{\circ} C$ , a brass wire of $1 mm$ radius 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 $40^{\circ} C to 20^{\circ} C$ 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 $10^{- 5} /^{\circ} C$ and $10^{11} {Nm}^{- 2}$ respectively; $g = 10 {ms}^{- 2})$

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