Thermal Expansion: A brass rod is 69.5 cm long and an aluminum rod is 49.3 cm long when both rods are at an initial temperature of 0° C. The rods are placed in line with a gap of 1.2 cm between them, as shown in the figure. The distance between the far ends of the rods is maintained at 120.0 cm throughout. The temperature of both rods is raised equally until they are barely in contact. At what temperature does contact occur? The coefficients of linear expansion of brass and aluminum are 2.0 × 10-5 K-1 (brass) and 2.4 × 10-5 K-1 (aluminum). 
A. 470°C
B. 440°C
C. 420°C
D. 490°C
E. 510°C
Answer: A
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If the atmosphere reflected 20.0% and absorbed 80.0% of the solar radiant energy, then what is the average temperature of the Earth's atmosphere?
A. -10.1
B. -11.4
C. -12.3
D. -14.5
E. -17.4
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A. The spacecraft's acceleration at Pluto is slower than its acceleration near Earth. B. The spacecraft's acceleration at Pluto is the same as its acceleration near Earth. C. The spacecraft's acceleration at Pluto is faster than its acceleration near Earth. D. The relative acceleration cannot be determined with the information given.
A star in the instability strip of the H-R diagram would:
A) vary in both temperature and radius. B) explode as a type I supernova. C) vary in temperature and brightness, but not in radius. D) vary in brightness with an irregular pattern. E) vary in temperature and radius, but not in brightness.
The volume of a gas is inversely proportional to the absolute pressure applied to it when the temperature is kept constant
Indicate whether the statement is true or false