Which source is the most luminous (or would be, if all its energy were output in visible light)?
a) The Sun.
b) A quasar.
c) A nuclear power plant.
d) A gamma-ray burst.
e) A supernova.
Ans: d) A gamma-ray burst.
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Betelgeuse is a star in the constellation Orion. It radiates heat at the rate of 2.70 × 1030 W and has a surface temperature of 3000 K
Assuming that it is a perfect emitter, what is the radius of Betelgeuse? The Stefan-Boltzmann constant is 5.67 × 10-8 W/(m2?K4). A) 7.80 × 1010 m B) 8.70 × 1010 m C) 1.40 × 1011 m D) 1.90 × 1011 m E) 2.16 × 1011 m
The second law of thermodynamics states that
A) energy cannot be created or destroyed B) matter cannot be crated or destroyed C) the energy in a system undergoes changes that lead to increasing disorder D) the energy in a system undergoes changes that lead to increasing complexity
Because it has a higher percentage of ________, Neptune appears even bluer than Uranus
Fill in the blank(s) with correct word
A ball is subjected to a pressure of 2.0 atmospheres. The un-squeezed diameter of the ball is 10.0 cm. The squeezed diameter of the ball is 9.999 cm. The bulk strain on the ball is
a. 
b. 
c. 
d. 
e. 