At the Australian War Memorial in Canberra, a Large Historic

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.