A metal bar is 20 cm long and has a rectangular cross-section measuring 1.0 cm × 2.0 cm. What is the voltage drop along its length when it carries a 4000-A current? The resistivity of the metal is 1.68 × 10-8 ? ? m
A) 0.067 V B) 0.67 V C) 0.034 V D) 0.34 V
A
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Studies from ________ led to the discovery of "dark energy."
A) Type II supernovae in the Large Magellanic Cloud B) Cepheid variables in the Virgo Cluster C) the COBE microwave ripples D) the gravitational lensing by MACHOs E) Type I supernovae at very large redshifts
A lunar eclipse can only happen during a:
A) new moon. B) equinox. C) full moon. D) perigee. E) aphelion.
A piece of glass that appears red
A) absorbs or reflects all colors except red. B) transmits red. C) both of these D) neither of these
When only part of the Moon is covered by Earth's full shadow (umbra), we see a(n)
A) total lunar eclipse. B) penumbral lunar eclipse. C) partial lunar eclipse. D) partial solar eclipse. E) annular eclipse.