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4. [15 pts] A 4.00 m long, 7.50 cm diameter rod is made of an unknown...

4. [15 pts] A 4.00 m long, 7.50 cm diameter rod is made of an unknown metal. In order to determine the type of metal, a 2500 N force is exerted on each end of the rod, causing the length of the rod to decrease by 2.50*10-5 m. What metal is the rod made of?

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