Explain plastic deformation in terms of molecular chains
What will be an ideal response?
Plastic deformation occurs when the molecular chains move relative to each other in a nonrecoverable way. In other words, the changes in shape are permanent because the sliding of the molecules has used up some energy and not enough energy remains to force the molecules into their original positions.
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The augers used for boring pier holes generally use
A) a hammering operation. B) a rotary operation with a helix-type blade cutter. C) a vibratory operation followed by a hammering operation. D) a rotary operation followed by a hammering operation. E) none of the above.
What did medieval and renaissance popes depend on to maintain their relative political autonomy?
a. an army of Swiss mercenaries b. the power of excommunication c. their reputation for piety and spiritual purity d. the income and power they drew from the Papal States
Find the inverse Fourier transforms of the following functions:
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Why are some reclaimed refrigerants classified as hazardous materials?
A) They have been through sealed systems. B) They are from pre-1993 systems. C) They have been recycled before being reclaimed. D) They may contain corrosive or carcinogenic chemicals.