You Wish to Suspend a Sculpture by a Single Wire

question 36

Multiple Choice

You wish to suspend a sculpture by a single wire high over the atrium of a new art gallery. You wish the state to rotate in the breeze. Your architect has given you a choice of several wires that you could use. Which will allow the sculpture to rotate most easily? The shear modulus of copper is 4.2x1010 N m-2 and that of steel is 8.4x1010 N m-2.

• A)Solid copper wire, 1 mm in radius.
• B)Hollow copper wire, inside radius 1 mm, outside radius 1.5 mm.
• C)Solid steel wire, 0.8 mm in radius.
• D)Hollow steel wire, inside radius 0.8 mm, outside radius 0.9 mm.
• E)All the other answers are equally good.

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