When should we know if any extra-solar planetary systems are like ours?
A) in just a few years
B) any day now, thanks to new, large, ground-based telescopes
C) in a decade or two, through our current space missions
D) We have already discovered several systems just like ours, through the Kepler mission.
C
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An ideal gas is at a pressure 1.00 × 105 N/m2 and occupies a volume 2.00 m3. If the gas is compressed to a volume 1.00 m3 while the temperature remains constant, what will be the new pressure in the gas?
A) 0.500 × 105 N/m2 B) 4.00 × 105 N/m2 C) 1.00 × 105 N/m2 D) 2.00 × 105 N/m2 E) The answer depends on the mass of the gas particles.
The background hiss that Bell Labs detected was the best observational evidence for the Big Bang
Indicate whether the statement is true or false
A parallel plate capacitor is connected to a battery that maintains a constant potential difference between the plates. If the spacing between the plates is doubled, how is the magnitude of charge on the plates affected?
Galactic collisions ____
a. are very rare, since few galaxies are in clusters b. will cause stars in each galaxy to collide and trigger supernova events c. often trigger bursts of star formation d. only happen in poor clusters e. usually break large galaxy into several small ones