A resistor drawn with an arrow through it is the symbol for a variable resistor.
Answer the following statement true (T) or false (F)
True
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Nitrogen gas at high pressure and 298 K is contained in a 2-m x 2-m x 2-m cubical container made of natural rubber whose walls are 3 cm thick. The concentration of nitrogen in the rubber at the inner and outer surfaces are 0.067 kg/m3 and 0.009 kg/m3, respectively. The diffusion coefficient of nitrogen through rubber is 1.5x10-10 m2/s. The mass flow rate of nitrogen by diffusion through the cubical container is
(a) 8.1?×?10?10 kg/s (b) 3.2?×?10?10 kg/s (c) 3.8?×?10?9 kg/s (d) 7.0?×?10?9 kg/s (e) 1.60?×?10?8 kg/s
Why do air-source heat pumps usually require auxiliary heat?
A) Because air-source heat pumps break down a lot B) Because the heating capacity of the unit drops as house heating requirements increase C) The heat pump compressor will not start in cold weather unless it is first warmed up D) The heat that a heat pump "pumps in" must first be provided by an auxiliary heat source
Milk is sometimes called "nature's most nearly perfect food."
Answer the following statement true (T) or false (F)
Standard steel or cast iron pipe is specified by the ______________________________ diameter.
Fill in the blank(s) with the appropriate word(s).