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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Definitions:

Pleasure Principle

A psychoanalytic concept suggesting that individuals seek pleasure and avoid pain to satisfy their biological and psychological needs.

Psychodynamic Therapy

A form of depth psychology, the primary focus of which is to reveal the unconscious content of a client's psyche in an effort to alleviate psychic tension.

Painful Memories

Recollections of past events or experiences that are emotionally distressing and may cause psychological discomfort.

Self-Actualization

Fulfillment of one’s potential for love, creativity, and meaning.