Explain the weatherability of plastics.
What will be an ideal response?
The weatherability of a plastic involves consideration of moisture, ultraviolet light, heat, and chemicals found in the air as ozone and hydrochloric acid. High-density polyethylene (HDPE) has great resistance to acids, water absorption, and weathering. It is used for electrical wire insulation. Acrylics also have great resistance to weathering and excellent optical qualities, so they are widely used for glazing.
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A(n) ____________________ is a general term that is used to refer to either a regular feature of size or an irregular feature of size.
Fill in the blank(s) with the appropriate word(s).
The top five FFA membership states are Texas, Georgia, Oklahoma, Missouri, and _____
A) Alaska? B) New York? C) California? D) Florida
Find v(t), t>0 in the circuit of Fig. 16.41. Let vs = 12 V.
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The most likely result of an unbalanced fan wheel would be
A) Unbalanced current between the two power legs B) Low manifold gas pressure C) Noise and vibration D) Delayed ignition