Which of the following gases absorbs ultraviolet light best?
A) carbon dioxide
B) nitrogen (N2)
C) the oxygen we breathe (O2)
D) hydrogen
E) ozone (O3)
E) ozone (O3)
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This diagram represents the life track of a 1 solar-mass star from its pre-main-sequence stages to just before its final death. Refer to the life stages labeled with roman numerals. Which stage lasts the longest?
A) Stage i B) Stage iii C) Stage iv D) Stage viii
A 1.5-kg mass has an acceleration of 
. Only two forces act on the mass. If one of the forces is 
, what is the magnitude of the other force?
A. 4.1 N B. 6.1 N C. 5.1 N D. 7.1 N E. 2.4 N
Starting from rest, a wheel undergoes constant angular acceleration for a period of time T. At which of the following times does the average angular acceleration equal the instantaneous angular acceleration?
a. 0.50T b. 0.67T c. 0.71T d. all of the above
If a wave has a wavelength of 25.4 cm and a frequency of 1.63 kHz, its speed is closest to
A) 0.414 m/s B) 41.4 m/s C) 414 m/s D) 41,400 m/s E) 15.6 m/s