Give an example each of natural, synthetic, and mixed materials.
What will be an ideal response?
Natural materials are those that occur in nature. Organic natural materials include wood and natural fi bers (like cotton, hemp, and wool). Inorganic natural materials include stone, clay, and metals. Synthetic materials are made by humans. Many substances that occur naturally can be produced synthetically. Common synthetic materials are rubber, plastics, Tefl on, nylon, and Kevlar. Mixed materials are a combination of natural and synthetic materials. Examples of mixed materials are plywood, paper, and woolpolyester blends of fabrics.
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What will be an ideal response?
Find the input impedance of the circuit in Fig. 13.102.
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Flex duct is easy to install, quiet, but has higher ________ than all other forms of duct material
A) installation cost B) efficiency ratings C) energy loss D) resistance to airflow
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Indicate whether the statement is true or false