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A block is hanged by means of two identi...

A block is hanged by means of two identical wires having cross section area 1`mm^(2)` as shown in the diagram. If temperature is lowered by `10^(@)C`, find the mass (in kg) to be added to the hanging mass such that the junction (J) remains at initial position, Given that coefficient of linear expansion `alpha=2xx10^(-5)//.^(@)C`, Young's modolus `Y=5xx10^(11) N//m^(2)` for the wire.

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