Which mechanism(s) of heat transfer will work in a vacuum?
a. conduction b. convection
c. radiation d. none of the above
c
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Molar Specific Heats: For an ideal gas,
A. 
= 1 for all ideal gases.
B. 
< 1 for all monatomic and diatomic gases.
C. 
> 1 for all monatomic and diatomic gases.
D. 
< 1 only for a monatomic gas.
E. 
< 1 only for a diatomic gas.
Which of the following is not a characteristic of the 11-year sunspot cycle?
A) The sunspot cycle is steady, so that each 11-year cycle is nearly identical to every other 11-year cycle. B) The likelihood of seeing solar prominences or solar flares is higher when sunspots are more common and lower when they are less common. C) The Sun's entire magnetic field flip-flops with each cycle, so that the overall magnetic cycle averages 22 years. D) The number of sunspots on the Sun at any one time gradually rises and falls, with an average of 11 years between the times when sunspots are most numerous.
The acceleration due to gravity at the surface of Planet X is 10 m/s2 . What is the acceleration due to gravity at an altitude of 3 000 km above the surface of this planet?
a. 10 m/s2 b. 8.0 m/s2 c. 4.4 m/s2 d. More information is needed.
One of the harmonics of a column of air in a tube that is open at one end and closed at the other has a frequency of 448 Hz, and the next higher harmonic has a frequency of 576 Hz. How long is the tube? The speed of sound in air is 343 m/s
A) 1.34 m B) 0.670 m C) 0.335 m D) 1.00 m E) 2.68 m