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1. Explain why Pb-Sn alloys are used for soldering.
2. Refractories used in steel making include silica brick that contain very small levels of alumina (Al2O3). The eutectic temperature in this system is about 1587°C. Silica melts at about 1725°C. Explain what will happen to the load bearing capacity of the bricks if a small amount of alumina gets incorporated into the silica bricks.
The U-235 and U-238 masses in natural uranium are split between enriched and depleted streams as a result of an enrichment process. If the input masses and output enrichments are specified, mass conservation determines the maximum (i.e. zero-loss) qu..
lf a flexible plastic line with a 20-mm inside diameter could be installed from the lake to the village, what theoretical flow rate is possible, ignoring all losses?
a stunt driver proposes to drive a small automobile at the speed of 45 mihr on the vertical wall of a circular pit of
air initially at a dry-bulb temperature of 45oc and relative humidity of 10 is adiabatically humidified to 60 relative
Calculate the degree of polymerization of a polyvinyl acetate polymer (mer formula C4H6O2) with amolecular weight of 28,000 amu. Calculate the molecular weight of a polyvinyl chloride molecule with a degree of polymerization of400
Suppose one of your classmates claims that the following boolean expressions represent the conversion from 4-bit Gray code to 4-bit binary numbers:
a fan drawing electricity at a rate of 1.5 kw is located within a well insulated 60 cubic meter rigid enclosure filled
a 10-kg closed system undergoes a heating process 100 kj. work is done by the system on the surroundings 100 kj. the
determine the flow rate from the pool at the instant shown if the hose has an inside diameter of 0.5 in. What had to happen to initiate flow from the drain hose? ·what will happen to the flow rate as the level of the pool drops?
The slope of the channel is 0.0020 ft/ft. Compute a chart showing the relationship be- tween reservoir elevation and discharge into the channel.
14. For each of the following F values, indicate whether the F is statistically significant at the specified alpha level:a. F = 4.80, df = 4, 40 α = 0.01b. F = 5.02, df = 3, 60, α = 0.001
an office building where smoking is prohibited has 600 employees. the building is to be maintained at 78 db and 65 wb
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