On some furnaces little pops and pings can be heard before the blower comes on. What causes this noise?
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Expansion and contraction of the heat exchanger as it heats up
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Are there any general notes shown on the drawing?
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The moist weight of 0.15 ft3 of soil is 18.6 lb. If the moisture content is 17 percent and the specific gravity of soil solids is 2.62, find the following: (a) bulk density, (b) dry density, (c) void ratio, (d) porosity, (e) degree of saturation, and (f) the volume occupied by water (ft3).
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Leakage from underground fuel tanks has been a source of water pollution. In a random sample of 87 gasoline stations, 13 were found to have at least one leaking underground tank.
a. Find a 95% confidence interval for the proportion of gasoline stations with at least one leaking underground tank. b. How many stations must be sampled so that a 95% confidence interval specifies the proportion to within ±0.03?
Based solely on these results of his pay in the previous question, do you think that Fred made a wise decision to change jobs?
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