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[" 9.) A "5" m long aluminium wire "(bar...

[" 9.) A "5" m long aluminium wire "(bar(Y=7times10^(10)Nm^(-2))" ) of "],[" diameter "3" mm supports a 40kg mass.In order to "],[" have the same elongation in the copper wire "],[(Y=12times10^(10)Nm^(-2))" of the same length under the "],[" same weight,the diameter should now be (in mm) "],[[" (1) "1.75," (2) "1.5],[" (3) "2.3," (4) "5.0]]

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