Which of the following statements about the main sequence stage in the life of a star is FALSE?
a) main sequence stars are rare in the Galaxy, so we are lucky to be living around one
b) different stars spend a different amounts of time (number of years) in the main sequence stage, depending on the characteristics they were born with
c) during the main sequence stage, the mass of any star does not change significantly
d) during the main sequence stage, energy to power the star is provided by the fusion of hydrogen
e) all stars spend the majority of their lives in the main sequence stage
Answer: a) main sequence stars are rare in the Galaxy, so we are lucky to be living around one
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Exhibit 11-1
Two birds of prey hurtling after the same mouse collide in mid-air and grab each other with their talons. Each 250-g bird is flying at 30 m/s at a 60° angle to the ground.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 11-1. What is the horizontal component of their momentum, in 
, immediately after the collision?
A. 0 B. 6.1 C. 7.5 D. 13 E. 15
A camera lens has a focal length of 50.0 mm and an aperture setting of f/4.00. What is the aperture diameter of this lens?
A) 14.2 mm B) 13.6 mm C) 10.1 mm D) 12.5 mm E) 15.0 mm
When I stand halfway between two speakers, with one on my left and one on my right, a musical note from the speakers gives me constructive interference. How far to my left should I move to obtain destructive interference?
a. one-fourth of a wavelength c. one wavelength b. half a wavelength d. one and a half wavelengths
Massive stars:
A) use their fuel sparingly. B) die after only a few million years. C) are unable to generate energy by nuclear fusion. D) do not evolve rapidly if their hydrogen is exhausted.