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2. A cable has a length of 12m and is stretched by 1.2×104m when a stress of 8.0
x10° Nm-2 is applied. What is the strain energy per unit volume in the cable when
the stress is applied?

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Physics
Numerical Problems
1. A 1.50cm length of pianos wire with a diameter of 0.25cm is stretched by
attaching a 10kg mass to one end. How far is the wire stretched?

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