At the Australian War Memorial in Canberra, a Large Historic

question 1

Multiple Choice

At the Australian War Memorial in Canberra, a large historic aircraft is to be put on display. The plan is to suspend it by a steel cable from the roof. The cable will be 5 m long, and has a radius of 5 mm. Steel has a Young's Modulus of 2x1011 N m-2. The cable stretches 3 mm when it is supporting the weight of the aircraft. How much elastic energy is stored in the cable in this situation?

• A)0.3 J.
• B)28 kJ.
• C)540 kJ.
• D)4.5 J.
• E)14.1 J.

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