You Have Been Asked to Help Suspend a Road-Sign Over

question 14

Multiple Choice

You have been asked to help suspend a road-sign over a narrow Hobart street. The sign has a mass of 100 kg and will need to be suspended from the end of a 5-m long steel beam which will be attached at the other end to a building. If the beam has a square cross-section, how thick will it need to be to carry the weight without sagging by more than a centimetre? Young's modulus for steel is 2.0x1011 N m-2.

• A)20 cm.
• B)15 cm.
• C)12.5 cm.
• D)10 cm.
• E)7.5 cm.

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