_________is uniform removal of metal from a part to produce a smooth surface by using electrochemical techniques.
Fill in the blank(s) with the appropriate word(s).
Electropolishing
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Dispersion occurs when:
a. a material changes some frequencies more than others. b. a material slows down some wavelengths more than others. c. some materials bend light more than other materials. d. light has different speeds in different materials.
To which group of polymers does polystyrene belong?
a. Natural b. Hydrolytic c. Addition d. Condensation
For a certain ideal Carnot engine, the hot reservoir is 35°C higher than the cold reservoir. If this engine is to have an efficiency of 20%, what must be the temperature of the hot reservoir?
A) 70.0 K B) 140 K C) 175 K D) 210 K E) 245 K
Current: When current is flowing in an ordinary metal wire, the magnitude of the average velocity of the electrons is closest to
A. 10 m/s. B. the speed of light. C. 1 mm/s. D. 1 km/s. E. 1 m/s.