Superconductors are noted for their
A) high electric resistance.
B) low electric resistance.
C) absence of electric resistance.
D) low cost.
E) bright colors.
Answer: C
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One of the strange consequences of special relativity is that
A. two events may appear simultaneous to one observer but not another. B. people moving at high speeds will feel crushed by length contraction. C. forces that are not real can be felt by some observers. D. time can move backward.
An ideal gas with ? = 1.30 occupies 7.0 L at 300 K and 200 kPa pressure. It is compressed adiabatically to 1/7 of its original volume, then cooled at constant volume to 300 K, and finally allowed to expand isothermally to 7.0 L
How much work does the gas do during this process? The ideal gas constant is R = 8.314 J/mol ? K = 0.0821 L ? atm/mol ? K. A) -980 J B) 6400 J C) -270,000 J D) -6400 J E) 980 J
What kind of variable stars are pre-Main Sequence stars undergoing gravitational contraction and exhibiting erratic changes in their luminosities?
A) R Coronae Borealis B) RR Lyrae C) Cepheid D) T Tauri E) Herbig-Haro
What happens to the visible light radiated by stars located within a dusty gas cloud?
A) It is absorbed by dust, which heats the dust grains so that they emit the absorbed energy as infrared light. B) It is blocked by dust and its energy is thereby lost. C) It is reflected by dust back to the star from whence it came. D) It passes through the cloud unaffected.