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9. A 5 m long aluminium wire (Y = 7 * 10...

9. A 5 m long aluminium wire (Y = 7 * 1010 Nm2) of diameter 3 mm supports a 40 kg mass. In order to have the same elongation in the copper wire (Y= 12 x 1010 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 OT TUU N a produced is was found to wire is 0.02 (1) 1.6x16 (3) 1.25 x 17. Two wires 2r respectiv

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