In essence, most of the extrasolar planets discovered to date have been found by
A) closely examining very high-resolution photographs of other star systems.
B) observing a star carefully enough to notice that it is experiencing a gravitational tug caused by an unseen planet.
C) identifying spectral lines that look like what we expect to see from a planet rather than a star.
D) observing mini-eclipses of a star as an unseen planet passes in front of it.
B
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In the context of supernova explosions, the _____ is a young remnant, only about 960 years old and about 9 ly in diameter
A) Lagoon Nebula B) Carina Nebula C) Eagle Nebula D) Crab Nebula
The reaction rate of a chemical reaction doubles when the temperature increases from 10
to 50
What is the activation energy?
a. 
b. 
c. 
d. 
e. 
System 1 is 3.1 moles of a monatomic ideal gas held at a constant volume of 2.70 L as it undergoes a temperature increase. System 2 is 3.1 moles of a diatomic ideal gas held at a constant volume of 2.7 L as it undergoes a temperature increase equal to the temperature increase of System 1 . The pressure increase for system 1 is ?P1 and for System 2 is ?P2 during the temperature increases. What
is the ratio of ?P1/?P2? a. 1.0 b. 0.60 c. 1.7 d. 2.5 e. 4.5
How long will it take if she stays in bed all day?
a. 2.41 hours b. 57.8 hours c. 37.7 hours d. 0.228 hours