You Wish to Bolt a Sign to a Horizontal I-Beam

question 18

Multiple Choice

You wish to bolt a sign to a horizontal I-beam supporting a bridge.You will weaken the beam least if you drill the bolt-holes through the

• A)upper flange.
• B)lower flange.
• C)web.
• D)All these will have the same effect.

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Definitions:

Alfred Russel Wallace

A British naturalist, explorer, geographer, anthropologist, and biologist known for independently conceiving the theory of evolution through natural selection.

Charles Darwin

A naturalist and biologist known for his theory of evolution through the mechanism of natural selection.

Pineal Body

Also known as the pineal gland, this small endocrine gland in the vertebrate brain secretes melatonin, regulated by light exposure.

Biological Rhythms

Internal cycles of biological activity within organisms, such as circadian rhythms, which influence sleep, feeding, and other physiological processes.